Cisco 642-812 Study Guide Book, Helpful Cisco 642-812 Certification Exam Online Store

Most accurate The Cisco 642-812 Questions & Answers covers all the knowledge points of the real exam. We update our product frequently so our customer can always have the latest version of Cisco 642-812.We provide our customers with the excellent 7×24 hours customer service.We have the most professional Cisco 642-812 expert team to back up our grate quality products.If you still cannot make your decision on purchasing our product, please try our Cisco 642-812 free pdf practice test for you to free download.Cisco 642-812 is also an authenticated IT certifications site that offer all the new questions and answers timely.Visit the site Flydumps.com to get free Cisco 642-812 VCE test engine and PDF.

QUESTION 82
Switch CK1 is configured to use the VLAN Trunking Protocol (VTP). What does CK1 advertise in its VTP domain?
A. The VLAN ID of all known VLANs, the management domain name, and the total number of trunk links on the switch.
B. The VLAN ID of all known VLANs, a 1-bit canonical format (CF1 Indicator), and the switch configuration revision number.
C. The management domain name, the switch configuration revision number, the known VLANs, and their specific parameters.
D. A 2-byte TPID with a fixed value of 0x8100 for the management domain number, the switch configuration revision number, the known VLANs, and their specific parameters.
E. None of the above.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
“Each switch participating in VTP advertises VLAN information, revision numbers, and VLAN parameters

on its trunk ports to notify other switches in the management domain.
VTP advertisements are sent as multicast frames. The switch intercepts frames sent to the VTP multicast
address and processes them with its supervisory processor VTP frames are forwarded out trunk links as a
special case.
The following global configuration information is distributed in VTP advertisements:

1.
VLAN IDs (ISL and 802.1Q)

2.
Emulated LAN names (for ATM LANE)

3.
802.10 SAID values (FDDI)

4.
VTP domain name

5.
VTP configuration revision number

6.
VLAN configuration, including maximum transmission unit (MTU) size for each VLAN

7.
Frame format Reference: CCNP Switching Exam Certification Guide: page 115, David Hucaby & Tim Boyles, Cisco Press 2001, ISBN 1-58720 000-7 Incorrect Answers: A: The total number of trunk links is not advertised.
B: A CFI is not advertised.
D: The TPID is not advertised. The value of 0x8100 is used to identify an 802.1Q trunking tag.
QUESTION 83
VTP switches use advertisements to exchange information with each other. Which of the following advertisement types are associated with VTP? (Select all that apply)
A. Domain advertisements
B. Advertisement requests from clients
C. Subset advertisements
D. Summary advertisements

Correct Answer: BCD Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP advertisements include:

1.
Summary Advertisements – These go out every 5 minutes or ever time the VLAN
topology changes, and lists of information about the management domain (VTP version, domain name,
configuration revision number, timestamp, MD5 encryption hash code, & number of subset advertisements
incoming). When there is a configuration change, summary advertisements are complimented by or more
subset advertisements.
2.
Subset advertisements – These are sent out by VTP domain servers after a
configuration change. They list the specifics of the change (VLAN creation / deletion / suspension /
activation / name change / MTU change) and the VLAN parameters (VLAN status, VLAN type, MTU, VLAN
name, VLAN number, SAID value).
3.
Advertisement Requests from Clients- VTP clients request specific VLAN information
that they’re lacking (ie. Client switch is reset and loses its database, or VTP domain membership changes)
so they can be responded by summary and subset advertisements.
Reference: CCNP Switching Exam Certification Guide: pages 116-117 David Hucaby & Tim Boyles, Cisco
Press 2001, ISBN 1-58720 000-7

QUESTION 84
Switch CK1 is part of the Certkiller VTP domain. What’s true of VTP Pruning within this domain? (Select all that apply)
A. It does not prune traffic from VLANs that are pruning-ineligible
B. VLAN 1 is always pruning-eligible
C. it will prune traffic from VLANs that are pruning-ineligible
D. VLAN 2 is always pruning-ineligible
E. None of the above.
Correct Answer: A Section: (none) Explanation

Explanation/Reference:
Explanation:
By definition, pruning-ineligible VLANs can not be pruned. You can make specific VLANs pruning ineligible
with the clear vtp pruneeligible vlan_range command. By default, VLANs 2-1000 are pruning-eligible. Since
the default VLAN for any switch port in a Catalyst switch is VLAN 1, it is not eligible for pruning.
Incorrect
Answers:

B: VLAN 1 is always pruning-ineligible
C: The opposite is true.
D: By default, VLANs 2-1000 are eligible to be pruned.
QUESTION 85
What action should you execute if you wanted to enable VTP pruning on your entire management domain?
A. Enable VTP pruning on any client switch in the management domain.
B. Enable VTP pruning on any switch in the management domain.
C. Enable VTP pruning on every switch in the management domain.
D. Enable VTP pruning on a VTP server in the management domain.
E. Disable VTP pruning on a VTP server in the management domain.

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: Enabling VTP pruning on a VTP server allows pruning for the entire management domain. Enabling this on the VTP server will mean that the VTP pruning configuration will be propagated to all VTP client switches within the domain. VTP pruning takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are pruning-eligible. Reference: Building Cisco Multilayer Switched Networks (Cisco Press) page 117
QUESTION 86
Switch CK1 is configured with VTP. Which two VTP modes will make CK1 capable of creating and deleting VLANs on itself? (Select two)
A. Client
B. Server
C. Transparent
D. Pass-through
E. No-negotiate

Correct Answer: BC Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP Modes
You can configure a switch to operate in any one of these VTP modes:

1.
Server-In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters (such as VTP version) for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode.

2.
Client-VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client.

3.
Transparent-VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based
on received advertisements. However, in VTP version 2, transparent switches do forward VTP
advertisements that they receive out their trunk interfaces.
If you configure the switch as VTP transparent, you can create and modify VLANs but the changes affect
only the individual switch.
Incorrect
Answers:

A: Clients can not modify, add, or delete any VLAN information. D, E: These options are not valid VTP modes.
QUESTION 87
When the Catalyst switch CK1 is enabled to use VTP, which information does it advertise on its trunk ports? (Select two)
A. VTP mode
B. STP root status
C. Negotiation status
D. Management domain
E. Configuration revision number

Correct Answer: DE Section: (none) Explanation
Explanation/Reference:
Explanation: The VTP protocol maintains VLAN configuration consistency throughout the network by distributing VLAN information to the network. VLAN information is sent to network devices in advertisements that contain the VTP management domain name, the current configuration revision number, the VLANs that the server knows about, and certain VLAN parameters. Any time you change a VLAN, VTP automatically sends an advertisement to update all other network devices. The following global configuration information is distributed in VTP advertisements:
1.
VLAN IDs (ISL and 802.1Q)

2.
Emulated LAN names (for ATM LANE)

3.
802.10 SAID values (FDDI)

4.
VTP domain name

5.
VTP configuration revision number

6.
VLAN configuration, including maximum transmission unit (MTU) size for each VLAN

7.
Frame format Reference: Cisco, Configuring VTP http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_6_1/config/vtp.htm
QUESTION 88
Is the following statement True or False?
MLS requires that MLS components be in the same VTP domain.

A. False
B. There is not enough information to determine
C. True
D. It could be true or false, depending on the type of switch.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
MLS requires that MLS components, including the end stations, must be in the same Virtual Trunking Protocol (VTP) domain. VTP is a Layer 2 protocol used for managing VLANs on several Catalyst switches from a central switch. It allows an administrator to create or delete a VLAN on all switches in a domain without having to do so on every switch in that domain. The MultiLayer Switching Protocol (MLSP), which the MLS-SE and the MLS-RP use to communicate with one another, does not cross a VTP domain boundary.
QUESTION 89
Which of the following VTP modes receives and forwards VTP updates, but does NOT participate in VTP synchronization?
A. Client
B. Server
C. Transparent
D. Pass-through
E. None of the above

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: Transparent-VTP transparent network devices do not participate in VTP. A VTP transparent network device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent network devices do forward VTP advertisements that they receive out their trunking LAN ports.
QUESTION 90
How can VTP pruning enhance network bandwidth?
A. By limiting the spreading of VLAN information.
B. By reducing unnecessary flooding of traffic to inactive VLANs.
C. By disabling periodic VTP updates.
D. By restricting unicast traffic to across VTP domains.
E. By updating unicast traffic periodically.
F. None of the above

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as
broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth
by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network
devices.
Reference:

http://www.cisco.com/en/US/products/hw/routers/ps368/
products_configuration_guide_chapter09186a0080091

QUESTION 91
Which of the following statements is NOT true regarding VTP?
A. Switches in VTP transparent mode will simply forward advertisements without processing them.
B. VTP reduces administrative overhead.
C. VTP pruning reduces overall network traffic.
D. VTP pruning is on by default.
E. All of the above are true statements.
F. None of the above

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
By default, VTP pruning is disabled.
For VTP pruning to be effective, all devices in the management domain must either support VTP pruning
or, on devices that do not support VTP pruning, you must manually configure the VLANs allowed on
trunks.
Incorrect
Answers:

A: This statement is true. Transparent VTP switches do not participate in the VTP process, but they do forward VTP information to other switches. B, C: VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices.
QUESTION 92
By what condition can a VTP version 2 switch operate in the same domain as a switch running VTP version 1?
A. VTP version 2 is disabled on the VTP version 2-capable switch
B. VTP version 2 is enabled on the VTP version 2-capable switch
C. VTP version 1 is disabled on the VTP version 2-capable switch
D. None of the above. VTP version 1 and version 2 are not compatible.
E. None of the above

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
A VTP version 2-capable switch can operate in the same VTP domain as a switch running VTP version 1
provided VTP version 2 is disabled on the VTP version 2-capable switch (VTP version 2 is disabled by
default). With VTP version 2 disabled, the switch will revert to version 1 to become backward compatible.

QUESTION 93
Is the following statement True or False?
If you modified a VTP transparent switch, the changes you implement will affect all the switches in the
network?

A. True
B. There is not enough information to determine
C. False

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
According to Cisco:
If you configure the switch as VTP transparent, you can create and modify VLANs but the changes affect
only the individual switch. Transparent switches do not participate in VTP. Only changes made to a VTP
switch in server mode will be propagated to all the other client switches within the network.

QUESTION 94
Which of the following message types are associated with VTP header fields on a Cisco switched network? (Select all that apply)
A. Summary advertisements
B. Advertisement requests
C. VTP Join messages
D. Subset advertisement
E. None of the above.

Correct Answer: ABCD Section: (none) Explanation
Explanation/Reference:
Explanation:
The format of the VTP header can vary depending on the type of VTP message.
However, they all contain the following fields in the header: VTP protocol version: 1 or 2 VTP Message
Types: Summary advertisements, Subset advertisement, Advertisement requests, VTP join messages,
Management domain length, and Management domain name.

QUESTION 95
In order for the Certkiller network to use VTP, which of the following conditions have to be met? (Select all that apply)
A. Trunking must be enabled between all Catalyst switches.
B. The Catalyst switches must be non-adjacent for trunking to be possible between them
C. The Catalyst switches must be adjacent.
D. Each Catalyst switch in a domain should be assigned the same VTP domain name.
E. None of the above

Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:
Explanation:
According to the online documentation provided by Cisco: In order to use VTP, you must assign a VTP
domain name to each switch. VTP information will remain only within the same VLAN domain. The
following are conditions for a VTP domain: -Each Catalyst switch in a domain should be assigned the same
VTP domain name.
-The Catalyst switches must be adjacent.
-Trunking must be enabled between all Catalyst switches.
If any one of the previous conditions is not met, the VTP domain is broken and information will not travel
between the two separate parts.

QUESTION 96
The Certkiller switches are all VTP enabled. What is true about VTP? (Select all that apply)
A. VTP version 2 is supported in supervisor engine software release 3.1(1) and later.
B. you must decide whether to use VTP version 1 or version 2.
C. VTP version 1 is supported in supervisor engine software release 2.1 or later
D. VTP version 1 is supported in ATM software release 3.1 or later.
E. None of the above

Correct Answer: ABCD Section: (none) Explanation Explanation/Reference:
Explanation:
According to Cisco Documentation:
If you use VTP in your network, you must decide whether to use VTP version 1 or version 2. VTP version 1
is supported in supervisor engine software release 2.1 or later and ATM software release 3.1 or later. VTP
version 2 is supported in supervisor engine software release 3.1(1) and later.
Reference:
http://www.cisco.com/en/US/products/hw/switches/ps679/
products_configuration_guide_chapter09186a008007
d

QUESTION 97
In the Certkiller switched network VTP pruning has been enabled. What is the purpose of VTP pruning?
A. Enhancing network integrity
B. Enhancing network bandwidth use
C. Deploying AAA
D. Enhancing network security
E. Enhancing network load balancing
F. None of the above

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
According to Cisco:
VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as
broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth
by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network
devices.

QUESTION 98
Switches CK1 and CK2 are both configured for transparent mode in the VTP domain. Which statement accurately describes these transparent VTP switches? (Select all that apply):
A. They do not synchronize VLAN configuration based on received advertisements
B. They do not participate in VTP
C. They do not advertise VLAN configuration
D. None of the above

Correct Answer: ABC Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN
configuration and does not synchronize its VLAN configuration based on received advertisements.
However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out
their trunk ports.

QUESTION 99
You are configuring switch CK1 for VTP. Which of the following are valid VTP operating modes that can be configured on CK1 ? (Select all that apply)
A. Server
B. Front-end
C. Client
D. Transparent
E. Backbone

Correct Answer: ACD Section: (none) Explanation
Explanation/Reference:
Explanation:
There are only three VTP operating modes:
1) Server: These switches have full control in the creation and modification of VLANs.
Servers advertise out all the VLAN information they receive, and they configure

themselves in accord with whatever information they hear. Switches are in server mode by default.
2) Client: These switches listen to VTP advertisements, they modify their configuration as a result of what
they hear, and they forward out VTP information to neighboring switches; but they don’t have the ability to:
create, change, or delete VLANs.
3) Transparent: These switches don’t participate in the VTP process. They don’t advertise their VLAN
configurations and they don’t synchronize their database when they receive advertisements. In VTP
version 1 a switch doesn’t relay information it gets to the other switches but in VTP version 2 they do.

QUESTION 100
Which of the following are true regarding the default values of a switch that is configured for VTP pruning? (Select two).
A. VLAN 1-1000 are pruning-eligible
B. VLAN 2-1000 are pruning-eligible
C. VLAN 1 is pruning-eligible
D. VLAN 1 is pruning-ineligible
E. VLAN 1-1023 is pruning-eligible
F. VLAN 1-1023 is pruning-ineligible

Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
Explanation:
By default, VLANs 2-1000 are pruning-eligible. Since the default VLAN for any switch port in a Catalyst
switch is VLAN 1, it is not eligible for pruning.

All our Cisco products are up to date! When you buy any Cisco 642-812 product from Certpaper, as “Cisco 642-812 Questions & Answers with explanations”, you are automatically offered the Cisco 642-812 updates for a total of 90 days from the day you bought it. If you want to renew your Cisco 642-812 purchase during the period of these 90 days, your Cisco 642-812 product is renewed and you are further enabled to enjoy the free Cisco updates.

Continue Reading

Cisco 642-812 Flydumps, New Release Cisco 642-812 Dumps PDF For Download

100% Valid And Pass With latest Cisco 642-812 exam dumps, you will never fail your Cisco 642-812 exam.All the questions and answers are updated and added to the new version timely by our experts.Also now Flydumps is offering free Cisco https://www.pass4itsure.com/642-812.html exam VCE player and PDF files for free on their website.

QUESTION 60
What would happen to a frame if a VLAN port configured as a trunk on the Catalyst switch CK1 were to receive an untagged frame?
A. The frame will cause an error message to be sent.
B. The frame will be dropped.
C. The frame will be processed as a native VLAN frame.
D. The frame will be tagged, and then processed as a native VLAN frame.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
On an IEEE 802.1Q trunk port, all transmitted and received frames are tagged except for those on the
VLAN configured as the native VLAN for the port. Frames on the native VLAN are always transmitted
untagged and are normally received untagged. The default native VLAN is VLAN 1.
Reference:
http://www.cisco.com/en/US/products/hw/optical/ps2006/
products_module_configuration_guide_chapter09186
a

QUESTION 61
Switch CK1 has a trunk link configured with IEEE 802.1Q encapsulation. What is the maximum Ethernet frame size on this trunk port?
A. 1496 Bytes
B. 1500 Bytes
C. 1518 Bytes
D. 1522 Bytes
E. 1548 Bytes

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation:
The 802.1q tag is 4 bytes; hence the resulting ethernet frame can be as large as 1522 bytes (1518 for the
maximum Ethernet frame size plus the 4 byte 802.1Q tag). The minimum size of the Ethernet frame with
802.1q tagging is 68 bytes.
Reference:
http://www.cisco.com/en/US/tech/ CK3 89/ CK3 90/technologies_tech_note09186a0080094665.shtml

QUESTION 62
The original frame is encapsulated and an additional header is added before the frame is carried over a trunk link. At the receive end, the header is removed and the frame is forwarded to the assigned VLAN.
This describes which technology?
A. DISL
B. DTP
C. IEEE802.1Q
D. ISL
E. MPLS

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
QUESTION 63
Assuming you have an IOS based switch; which command would you execute if you
wanted to specify IEEE 802.1Q encapsulation on a trunked port?
A. Switch(config-if)#switchport trunk encapsulation dot1q
B. Switch(config-if)#switchport encapsulation dot1q
C. Switch(config-if)#switchport trunk encapsulation isl
D. Switch(config)#switchport 0/1 trunk encapsulation isl
E. None of the above

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
Ethernet Trunk Encapsulation Types:

1.
switchport trunk encapsulation isl – Specifies ISL encapsulation on the trunk link.

2.
switchport trunk encapsulation dot1q – Specifies 802.1Q encapsulation on the trunk link.

3.
switchport trunk encapsulation negotiate – Specifies that the interface negotiate with the neighboring interface to become an ISL (preferred) or 802.1Q trunk, depending on the configuration and capabilities of the neighboring interface. The trunking mode, the trunk encapsulation type, and the hardware capabilities of the two connected interfaces determine whether a link becomes an ISL or 802.1Q trunk. Reference: http://www.cisco.com/en/US/products/hw/switches/ps700/ products_configuration_guide_chapter09186a008007 f
QUESTION 64
Two Certkiller switches are connected as shown below:
Which statements are true regarding the configuration of the above pair of switches? (Select two)
A. The trunk is currently using the ISL trunking protocol.
B. The trunk is currently using the 802.1q trunking protocol.
C. By default, all VLANs will be transmitted across this trunk.
D. By default, Switch CK1 and Switch CK2 ‘s Fast Ethernet 0/1 port will not generate DTP messages.
E. By default, the trunk can only support one VLAN, and only that single VLAN is transmitted across the trunk.

Correct Answer: BC Section: (none) Explanation
Explanation/Reference:
Explanation:
The second line in each configuration (#switchport trunk encapsulation dot1q) proves that B is correct, as
dot1q is Cisco IOS for 802.1q trunking.

A trunk allows inter-VLAN traffic to flow between directly connected switches. By default, a trunk port is a
member of all VLANs, so traffic for any and all VLANs can travel across this trunk. That includes broadcast
traffic! Reference:
http://www.mcmcse.com/cisco/guides/trunking_and_trunking_protocols.shtml

QUESTION 65
Switches Certkiller 1 and Certkiller 2 are connected as shown in the diagram below:
Use the following output taken from each port Certkiller 1: show config: interface GigabitEthernet0/1 switchport trunk encapsulation dot1q switchport mode dynamic auto no ip address show interface gig0/1 switchport: Name: Gi0/1 Switchport: Enabled Administrative Mode: dynamic auto Operational Mode: down Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Certkiller 2: show interface gig0/1 switchport: Name: Gi0/1 Switchport Enabled Administrative Mode: dynamic auto Operational Mode: down Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) In accordance with the above exhibit: what’s preventing the two switches from trunking on the link between them?
A. There is no IP address denied.
B. no shutdown needs to be entered on the interfaces.
C. Both sides are in auto negotiation mode.
D. ISL should be used instead of 802.1q.
E. Access mode VLAN must be different from native mode VLAN.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation:
In the switchport mode command, you can set the trunking mode to any of the following:

1.
trunk-This setting places the port in permanent trunking mode. The corresponding

switch port at the other end of the trunk should be similarly configured because negotiation is not allowed. You should also manually configure the encapsulation mode.

2.
dynamic desirable (the default)-The port actively attempts to convert the link into
trunking mode. If the far-end switch port is configured to trunk, dynamic desirable, or dynamic auto mode,
trunking is successfully negotiated.
3.
dynamic auto-The port converts the link into trunking mode. If the far-end
switch port is configured to trunk or dynamic desirable, trunking is negotiated.
Because of the passive negotiation behavior, the link never becomes a trunk if both ends of the link are left
to the dynamic auto default.

QUESTION 66
You have just configured an ISL trunk line over Ethernet media between two Cisco Switches, each switch having identical modules, software revisions, and VLAN configurations. Which of the following variables are NOT necessary for the ISL trunk to operate properly? (Select all that apply)
A. Identical trunk negotiation parameters at each end of the link
B. Identical duplex at each end of the link
C. Identical speed at each end of the link
D. Identical native VLAN parameters at each end of the link

Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
Explanation: In order for a trunk connection to function properly, it is not necessary for the trunking negotiation parameters to be identical. For example, one end could be configured as “on” and the other could be configured for “auto-negotiate” and the trunk would be operational. Similarly, it is not necessary for the native VLAN parameters to be the same at each end. Incorrect Answers: B, C: One of the requirements for trunking to work is to have both sides of the trunk agree on the speed and duplex settings. Both sides must be configured with identical speed and duplex settings.
QUESTION 67
An ISL trunk connects switches CK1 and CK2 . What is the numerical range of user-configurable ISL VLANs on these switches?
A. 1-1001
B. 0-4095
C. there is no range
D. 0 – 1000
E. None of the above

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation: The valid range of user-configurable ISL VLANs is 1-1001. The valid range of VLANs specified in the IEEE 802.1Q standard is 0-4095. In a network environment with non-Cisco devices connected to Cisco switches through 802.1Q trunks, you must map 802.1Q VLAN numbers greater than 1000 to ISL VLAN numbers. 802.1Q VLANs in the range 1-1000 are automatically mapped to the corresponding ISL VLAN. 802.1Q VLAN numbers greater than 1000 must be mapped to an ISL VLAN in order to be recognized and forwarded by Cisco switches.
QUESTION 68
An ISL trunk connects switches CK1 and CK2 . What is true about the Inter-Switch Link (ISL) protocol? (Select two)
A. ISL can be used between Cisco and non-Cisco switch devices.
B. ISL calculates a new CRC field on top of the existing CRC field.
C. ISL adds 4 bytes of protocol-specific information to the original Ethernet frame.
D. ISL adds 30 bytes of protocol-specific information to the original Ethernet frame.

Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
Explanation:
B: A second frame check sequence (FCS) field lies at the end of the frame.
D: ISL is an external tagging process: new 26-byte ISL header is added to the original Ethernet frame. A second 4-byte frame check sequence (FCS) field is added at the end of the frame so 30 bytes of total overhead is added. Incorrect Answers:
A: Cisco’s propriety version of frame tagging is ISL. ISL can only be used between Cisco routers.
C: 30 bytes are added to the Ethernet frame, not 4 bytes. 4 bytes are added using 802.1Q encapsulation.
QUESTION 69
Which of the commands below enables a trunking protocol that appends a four byte CRC to the packet when applied to the Certkiller switch?
A. Switch(config-if)#switchport trunk encapsulation dot1q
B. Switch(config-if)#switchport trunk encapsulation ietf
C. Switch(config-if)#switchport trunk encapsulation fddi
D. Switch(config-if)#switchport trunk encapsulation isl
E. None of the above

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: ISL is made up of three major components: a header, the original Ethernet frame, and a frame check sequence (FCS) at the end. With ISL, an Ethernet frame is encapsulated with a header that transports VLAN IDs between switches and routers. The 26-byte header containing a 10-bit VLAN ID is added to each frame. In addition, a 4-byte tail is added to the frame to perform a cyclic redundancy check (CRC). This CRC is in addition to any frame checking that the Ethernet frame performs. Reference: Building Cisco Multilayer Switched Networks (Cisco Press) page 99
QUESTION 70
Which statement is true regarding the configuration of ISL trunks?
A. All catalyst switches support ISL trunking.
B. A Catalyst switch will report giants if one side is configured for ISL while the other side is not.
C. ISL trunking requires that native VLANs match.
D. A Catalyst switch cannot have ISL and IEEE 802.1q trunks enabled.
E. None of the above

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
The 802.1q tag is 4 bytes; hence the resulting ethernet frame can be as large as 1522 bytes. The minimum

size of the Ethernet frame with 802.1q tagging is 68 bytes. ISL frames are the standard MTU used in Ethernet frames, which is 1518 bytes. If one end of the trunk is configured for ISL frames of up to 1518 bytes will be expected on it, while the other end will be sending frames up to 1522 bytes in length. On the ISL configured end, these incoming frames will be considered as giants. This is just one of the reasons why ISL and 802.1Q are incompatible. Incorrect Answers:
A: Not every Cisco switch model supports ISL.
C: In ISL, it is not necessary for the native VLANs to match.
D: Although it is true that each end of a trunk should be configured using the same encapsulation types, it is possible for a switch to have an ISL trunk configured on one port and an 802.1Q trunk on another port.
QUESTION 71
Two Certkiller switches are connected via a trunk using VTP. Which VTP information does a Catalyst switch advertise on its trunk ports when using VTP? (Select two)
A. STP root status
B. VTP mode
C. Negotiation status
D. Management domain
E. Configuration revision number

Correct Answer: DE Section: (none) Explanation
Explanation/Reference:
Explanation:
The role of the VLAN Trunking Protocol (VTP) is to maintain VLAN configuration consistency across the
entire network. VTP is a messaging protocol that uses Layer 2 trunk frames to manage the addition,
deletion, and renaming of VLANs on a network-wide basis from a centralized switch that is in the VTP
server mode. VTP is responsible for synchronizing VLAN information within a VTP domain. This reduces
the need to configure the same VLAN information on each switch.
Using VTP, each Catalyst Family Switch advertises the following on its trunk ports:

1.
Management domain

2.
Configuration revision number

3.
Known VLANs and their specific parameters
QUESTION 72
You need to investigate a VTP problem between two Certkiller switches. The lack of which two prevents VTP information from propagating between switches? (Select two)
A. A root VTP server
B. A trunk port
C. VTP priority
D. VLAN 1
E. None of the above

Correct Answer: BD Section: (none) Explanation
Explanation/Reference:
Explanation: In Switch tow types of links are available, access and trunk. The interface is in access mode can carry the information of only one VLAN and trunk can carry the information of more than one VLAN. VTP carry the information of more than one vlan so Switch port should be in trunk mode. VLAN1 is the default VLAN on Cisco Switch, by default all interface belongs to VLAN 1.
QUESTION 73
CK1 and CK2 are switches that communicate via VTP. What is the default VTP advertisement intervals in Catalyst switches that are in server or client mode?
A. 30 seconds
B. 5 minutes
C. 1 minute
D. 10 seconds
E. 5 seconds
F. None of the above

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation:
Periodic ( default is 5 minutes) VTP advertisements are sent out each trunk port with the multicast
destination MAC address 01-00-0C-CC-CC-CC. VTP advertisements contain the following configuration
information:

1.
VLAN IDs (ISL and 802.1Q)

2.
Emulated LAN names (ATM LANE)

3.
802.10 SAID values (FDDI)

4.
VTP domain name

5.
VTP configuration revision number

6.
VLAN configuration, including the maximum transmission unit (MTU) size for each VLAN

7.
Frame format
QUESTION 74
On the network shown below, VTP has been enabled on the trunk links between all switches within the TEST domain. An administrator has recently enabled VTP pruning. Port 1 on Switch Certkiller 1 and port 2 on Switch Certkiller 4 are assigned to VLAN 2. A broadcast is sent from the host connected to Switch Certkiller 1.
Where will the broadcast propagate?
A. Switches Certkiller 1, Certkiller 2 , and Certkiller 4 will receive the broadcast, but only Switch Certkiller 4 will forward it out port 2.
B. Only Switch Certkiller 4 will receive the broadcast and will forward it out port 2.
C. Every switch in the network receives the broadcast and will forward it out all ports.
D. Every switch in the network receives the broadcast, but only Switch Certkiller 4 will forward it out port 2.

Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
The default behavior of a switch is to propagate broadcast and unknown packets across the network. This
behavior results in a large amount of unnecessary traffic crossing the network.

VTP pruning increases bandwidth efficiency by reducing unnecessary flooding of traffic, such as
broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth
by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network
devices. By default, VTP pruning is disabled.
Enabling VTP pruning on a VTP server enables pruning for the entire management domain. VTP pruning
takes effect several seconds after it is enabled. By default, VLANs 2 through 1000 or 2 through 1001 are
pruning eligible, depending upon the platform.
VTP pruning does not prune traffic from VLANs that are pruning ineligible. VLAN 1 is always pruning
ineligible and VLAN 1 cannot be removed from a trunk. However, the “VLAN 1 disable on trunk” feature
available on Catalyst 4000, 5000, and 6000 family switches enables the pruning of user traffic, but not
protocol traffic such as CDP and VTP, for VLAN 1 from a trunk. Use the vtp pruning command to make

VLANs pruning eligible on a Cisco IOS-based switch. Switch(vlan)#vtp pruning Once pruning is enabled, use the switchport trunk pruning command to make a specific VLAN pruning ineligible. Switch(config)#interface fastethernet 0/3 Switch(config-if)#switchport trunk pruning vlan remove vlan 5
QUESTION 75
You want to configure switch CK1 to propagate VLAN information across the Certkiller network using VTP. What must be configured on a Cisco switch in order to advertise VLAN information?
A. VTP mode
B. VTP password
C. VTP revision number
D. VTP pruning
E. VTP domain name
F. None of the above

Correct Answer: E Section: (none) Explanation
Explanation/Reference:
Explanation: If the switch being installed is the first switch in the network, the management domain will need to be created. However, if the network has other switches running VTP, then the new switch will join an existing management domain. Verify the name of the management domain. If the management domain has been secured, verify and configure the password for the domain. To create a management domain or to add a switch to a management domain, use the vtp domain command in the global configuration mode or VLAN configuration mode. Switch(config)#vtp domain name Switch(vlan)#vtp domain
QUESTION 76
The Certkiller switches have all been upgraded to use VTP version 2. What are two benefits provided in VTP Version 2 that are not available in VTP Version 1? (Select two)
A. VTP version 2 supports Token Ring VLANs
B. VTP version 2 allows VLAN consistency checks
C. VTP version 2 allows active redundant links when used with spanning tree
D. VTP version 2 reduces the amount of configuration necessary
E. VTP version 2 saves VLAN configuration memory

Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
Explanation: Understanding VTP Version 2 If you use VTP in your network, you must decide whether to use VTP version1 or version2. Note: If you are using VTP in a Token Ring environment, you must use version2. VTP version 2 supports the following features not supported in version1: Token Ring support-VTP version2 supports Token Ring LAN switching and VLANs (Token Ring Bridge Relay Function [TrBRF] and Token Ring Concentrator Relay Function [TrCRF]). Unrecognized Type-Length-Value (TLV) Support-A VTP server or client propagates configuration changes to its other trunks, even for TLVs it is not able to parse. The unrecognized TLV is saved in NVRAM. Version-Dependent Transparent Mode-In VTP version1, a VTP transparent network device inspects VTP messages for the domain name and version, and forwards a message only if the version and domain name match. Because only one domain is supported in the supervisor engine software, VTP version 2 forwards VTP messages in transparent mode without checking the version. Consistency Checks-In VTP version 2, VLAN consistency checks (such as VLAN names and values) are performed only when you enter new information through the CLI or SNMP. Consistency checks are not performed when new information is obtained from a VTP message, or when information is read from NVRAM. If the digest on a received VTP message is correct, its information is accepted without consistency checks. Reference: http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2ZY/configuration/guide/ vtp.html#wp1020
QUESTION 77
The Certkiller network administrator needs to enable VTP pruning within the Certkiller network. What action should a network administrator take to enable VTP pruning on an entire management domain?
A. Enable VTP pruning on any switch in the management domain
B. Enable VTP pruning on any client switch in the domain
C. Enable VTP pruning on a VTP server in the management domain
D. Enable VTP pruning on every switch in the domain
E. None of the above

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
Explanation: The default behavior of a switch is to propagate broadcast and unknown packets across the network. This behavior results in a large amount of unnecessary traffic crossing the network. VTP pruning increases bandwidth efficiency by reducing unnecessary flooding of traffic, such as broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. By default, VTP pruning is disabled. Enabling VTP pruning on a VTP server enables pruning for the entire management domain. VTP pruning takes effect several seconds after it is enabled. By default, VLANs 2 through 1000 or 2 through 1001 are pruning eligible, depending upon the platform. VTP pruning does not prune traffic from VLANs that are pruning ineligible. VLAN 1 is always pruning ineligible and VLAN 1 cannot be removed from a trunk. However, the “VLAN 1 disable on trunk” feature available on Catalyst 4000, 5000, and 6000 family switches enables the pruning of user traffic, but not protocol traffic such as CDP and VTP, for VLAN 1 from a trunk. Use the vtp pruning command to make VLANs pruning eligible on a Cisco IOS-based switch. Switch(vlan)#vtp pruning Once pruning is enabled, use the switchport trunk pruning command to make a specific VLAN pruning ineligible. Switch(config)#interface fastethernet 0/3 Switch(config-if)#switchport trunk pruning vlan remove vlan 5
QUESTION 78
VTP is configured on switch CK1 . Which of the following features were added in VTP version 2 that were not previously supported in VTP version 1? (Select two)
A. Supports Token Ring VLANs.
B. Allows VLAN consistency checks.
C. Saves VLAN configuration memory.
D. Reduces the amount of configuration necessary.
E. Allows active redundant links when used with spanning tree.

Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP Version 2 includes the following improvements: Token Ring VLAN support, TLV support, transparent
mode, and Consistency checks.

Incorrect
Answers:
C, D: These were not improvements added to VTP Version 2.

E: STP detects and prevents loops by logically disabling the redundant path ports so there are no active redundant links.
QUESTION 79
The Certkiller switches are configured to use VTP. What’s true about the VLAN trunking protocol (VTP)? (Select two)
A. VTP messages will not be forwarded over nontrunk links.
B. VTP domain names need to be identical. However, case doesn’t matter.
C. A VTP enabled device which receives multiple advertisements will ignore advertisements with higher configuration revision numbers.
D. A device in “transparent” VTP v.1 mode will not forward VTP messages.
E. VTP pruning allows switches to prune VLANs that do not have any active ports associated with them.

Correct Answer: AD Section: (none) Explanation
Explanation/Reference:
Explanation:
VTP messages are only transmitted across trunk links.
If the receiving switch is in transparent mode, the configuration is not changed. Switches in transparent
mode do not participate in VTP. If you make VTP or VLAN configuration changes on a switch in
transparent mode, the changes are not propagated to the other switches in the network.
Incorrect
Answers:

B: The VTP domain name is case sensitive and it must be identical with the domain name configured on the VTP server.
C: This is incorrect because if a VTP client receives an advertisement with a higher revision number, it won’t ignore it. In fact, the advertisement with a higher revision level takes precedence when the switch is configured in client mode.
E: VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate network devices. It does not prune the individual VLANs.
QUESTION 80
Switch CK1 and CK2 both belong to the Certkiller VTP domain. What’s true about the switch operation in VTP domains? (Select all that apply)
A. A switch can only reside in one management domain
B. A switch is listening to VTP advertisements from their own domain only
C. A switch is listening to VTP advertisements from multi domains
D. A switch can reside in one or more domains
E. VTP is no longer supported on Catalyst switches

Correct Answer: AB Section: (none) Explanation
Explanation/Reference:
Explanation:
A VTP domain is made up of one or more interconnected devices that share the same VTP domain name.
A switch can be configured to be in only one VTP domain, and each VLAN has a name that is unique

within a management domain.
Typically, you use a VTP domain to ease administrative control of your network or to account for physical
boundaries within your network. However, you can set up as many or as few VTP domains as are
appropriate for your administrative needs. Consider that VTP is transmitted on all trunk connections,
including ISL, IEEE 802.1Q, 802.10, and LANE.
Switches can only belong to one management domain with common VLAN requirements, and they only
care about the neighbors in their own domains.
Reference: CCNP Switching Exam Certification Guide: David Hucaby & Tim Boyles, Cisco Press 2001,
ISBN 1-58720 000-7 page 114

Cisco https://www.pass4itsure.com/642-812.html Exam Certification Guide presents you with an organized test preparation routine through the use of proven series elements and techniques.“Do I Know This Already?”quizzes open each chapter and allow you to decide how much time you need to spend on each section.Cisco 642-812 lists and Foundation Summary tables make referencing easy and give you a quick refresher whenever you need it.Challenging Cisco 642-812 review questions help you assess your knowledge and reinforce key concepts. Cisco 642-812 exercises help you think about exam objectives in real-world situations,thus increasing recall during exam time.

Continue Reading