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642-813 Q&A – Implement VLAN based solution (46-50)

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

The Company 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.

Answer: A,D
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.

Company uses layer 3 switches in the Core of their network. Which method of Layer 3 switching uses a forwarding information base (FIB)?
A. Topology-based switching
B. Demand-based switching
C. Route caching
D. Flow-based switching
E. None of the other alternatives apply
Answer: A
The Layer 3 engine (essentially a router) maintains routing information, whether from static routes or dynamic routing protocols. Basically, the routing table is reformatted into an ordered list with the most specific route first, for each IP destination subnet in the table. The new format is called a
Forwarding Information Base (FIB) and contains routing or forwarding information that the network prefix can reference.
In other words, a route to might be contained in the FIB, along with routes to and, if those exist. Notice that these examples are increasingly more specific subnets. In the FIB, these would be ordered with the most specific, or longest match, first, followed by less specific subnets. When the switch receives a packet, it can easily examine the destination address and find the longest match entry in the FIB. The FIB also contains the nexthop address for each entry. When a longest match entry is found in the FIB, the Layer 3 next-hop address is found, too.

If you were to configure an ISL Ethernet trunk between two Cisco switches, named R1 and R2, what would you have to include at the end of the link for the trunk to operate correctly? (Select two)
A. An identical VTP mode.
B. An identical speed/duplex.
C. An identical trunk negotiation parameter.
D. An identical trunk encapsulation parameter.
Answer: B,D
In order for a trunk to be operational, the speed and duplex settings must match at each end of the trunk, and both switches must use the same trunking encapsulation (802.1Q or ISL).
Incorrect Answers:
A: It is common for switches to have trunk links operating, while the VTP modes differ. For example, a switch configured with VTP mode server can have a trunk connected to a switch with VTP mode client.
C: This is incorrect, as there are a number of configurations that are supported where the trunk negotiation parameters differ between switches. For example, switch R1 could have the trunk configured for "on" while switch R2 could have the switch trunk configured for "desirable" and the trunk would be operational.

Which of the following trunking modes are unable to request their ports to convert their links into trunk links? (Select all that apply)
A. Negotiate
B. Designate
C. No negotiate
D. Auto
E. Manual
F. Off
Answer: C,D
Auto is a trunking mode but does not actively negotiate a trunk. It requires opposite side to be trunk or desirable, and will only respond to requests from the other trunk link. No-negotiate will configure the link to be unable to dynamically become a trunk; since no requests will be sent it will not respond to requests from other trunk links from a different switch.

The Company LAN switches are being configured to support the use of Dynamic VLANs. Which of the following are true of dynamic VLAN membership? (Select all that apply)
A. VLAN membership of a user always remains the same even when he/she is moved to another location.
B. VLAN membership of a user always changes when he/she is moved to another location.
C. Membership can be static or dynamic.
D. Membership can be static only.
E. None of the other alternatives apply.
Answer: A,C
Dynamic VLAN memberships are based on the users MAC address connected to the port. If you have VTP server, a VTP database file, a VTP client switch, and a dynamic port; regardless of where your physical location is, you can still remain in the same VLAN.
Incorrect Answers:
B: This was true before the use of Dynamic VLAN membership, as VLANs were assigned to ports, not users.
D: VLAN memberships can be either static or dynamic.