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642-813 Q&A – Implement VLAN based solution (1-5)

Section 1 – Implement VLAN based solution, given a network design and a set of requirements

VTP devices in a network track the VTP revision number. What is a VTP configuration revision number?
A. A number for identifying changes to the network switch.
B. A number for identifying changes to the network router.
C. A number for identifying changes to the network topology.
D. None of the other alternatives apply.

Answer: C
The configuration revision number is a 32-bit number that indicates the level of revision for a VTP packet. Each VTP device tracks the VTP configuration revision number assigned to it, and most of the VTP packets contain the VTP configuration revision number of the sender.
This information is used to determine whether the received information is more recent than the current version. Each time you make a VLAN change in a VTP device, the configuration revision is incremented by one. In order to reset the configuration revision of a switch, change the VTP domain name and then change it back to the original name.
Incorrect Answers:
A: Not all switch configuration changes will impact the VTP revision number. Only changes made to the VLAN configuration will cause an increment in the revision number.
B: VTP revision numbers are only used on network switches configured for VTP and are not used by Cisco routers.Reference: Understanding and Configuring VLAN trunk protocol (VTP) Document
ID: 10558 http://www.cisco.com/warp/public/473/21.html

Refer to the exhibit. VLAN 1 and VLAN 2 are configured on the trunked links between Switch A and Switch B. Port Fa 0/2 on Switch B is currently in a blocking state for both VLANs. What should be done to load balance VLAN traffic between Switch A and Switch B?

A. Lower the port priority for VLAN 1 on port 0/1 for Switch A.
B. Lower the port priority for VLAN 1 on port 0/2 for Switch A.
C. Make the bridge ID of Switch B lower than the ID of Switch A.
D. Enable HSRP on the access ports.
Answer: B
Load Sharing Using STP Port Priorities
When two ports on the same switch form a loop, the STP port priority setting determines which port is enabled and which port is in a blocking state. The priorities on a parallel trunk port can be set so that the port carries all the traffic for a given VLAN. The trunk port with the higher priority (lower values) for a VLAN is forwarding traffic for that VLAN. The trunk port with the lower priority
(higher values) for the same VLAN remains in a Blocking state for that VLAN. One trunk port sends or receives all traffic for the VLAN.

You want to configure switch R1 to propagate VLAN information across the Company 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 other alternatives apply
Answer: E
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

Refer to the show interface Gi0/1 switchport command output shown in the exhibit. Which two statements are true about this interface? (Choose two.)

A. This interface is a member of a voice VLAN.
B. This interface is configured for access mode.
C. This interface is a dot1q trunk passing all configured VLANs.
D. This interface is a member of VLAN7.
E. This interface is a member of VLAN1.
Answer: B, D
In Exhibit, Operation mode is in static access and Access mode VLAN is 7 so it means this port is operating on access mode as a member of VLAN 7.

You are the network administrator tasked with designing a switching solution for the Company network. Which of the following statements describing trunk links are INCORRECT? (Select all that apply)
A. The trunk link belongs to a specific VLAN.
B. Multiple trunk links are used to connect multiple end user devices.
C. A trunk link only supports native VLAN.
D. Trunk links use 802.10 to identify a VLAN.
E. The native VLAN of the trunk link is the VLAN that the trunk uses for untagged packets.
Answer: A,B,C,D
A trunk is a point-to-point link that transmits and receives traffic between switches or between switches and routers. Trunks carry the traffic of multiple VLANs and can extend VLANs across an entire network. 100BaseT and Gigabit Ethernet trunks use Cisco ISL (the default protocol) or industry-standard IEEE 802.1Q to carry traffic for multiple VLANs over a single link. Frames received from users in the administratively-defined VLANs are identified or tagged for transmission to other devices. Based on rules you define, a unique identifier (the tag) is inserted in each frame header before it is forwarded. The tag is examined and understood by each device before any broadcasts or transmission to other switches, routers, or end stations. When the frame reaches the last switch or router, the tag is removed before the frame is transmitted to the target end station.
Incorrect Answers:
E: This statement is true, as untagged frames are always used with the native VLAN. The native VLAN is VLAN 1 by default in Cisco switches.

3 thoughts on “642-813 Q&A – Implement VLAN based solution (1-5)

  1. neo1674 says:

    On question 1, I think D is the correct answer. AFAIK, VTP is all about VLANs and pruning and has little to do with network topology. In fact, if network topology changes (link failure, new links, etc.) it will be STP dealing with the problem and VTP config revision number will remain unchanged.

  2. Harold says:

    On question 2, I would say lower the priority on any port 0/1. Currently the STP block falls on port 0/2 for both VLAN1 and 2. Lowering the priority on the non-winning link (between 0/2 and 0/2) has no effect AFAIK.

    Only if a high priority on a 0/1 (currently non-blocking) drops below a value it can becomes blocking I would say…

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