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642-813 Q&A – Implement VLAN based solution (31-35)

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

Refer to the exhibit and the show interfaces fastethernet0/1 switchport outputs. Users in VLAN 5 on switch SW_A complain that they do not have connectivity to the users in VLAN 5 on switch SW_B. What should be done to fix the problem?

A. Configure the same number of VLANs on both switches.
B. Create switch virtual interfaces (SVI) on both switches to route the traffic.
C. Define VLAN 5 in the allowed list for the trunk port on SW_A.
D. Disable pruning for all VLANs in both switches.
E. Define VLAN 5 in the allowed list for the trunk port on SW_B
Answer: C
Switchport trunk allowed vlan , defines which VLANs can be trunked over the link . By default, a switch transports all active VLANs (1 to 4094) over a trunk link. There might be times when the trunk link should not carry all VLANs. For example, broadcasts are forwarded to every switch port on a VLAN-including the trunk link because it, too, is a member of the VLAN.
If the VLAN does not extend past the far end of the trunk link, propagating broadcasts across the trunk makes no sense.

The Company LAN switches are being configured to support the use of Dynamic VLANs. What should be considered when implementing a dynamic VLAN solution? (Select two)
A. Each switch port is assigned to a specific VLAN.
B. Dynamic VLANs require a VLAN Membership Policy Server.
C. Devices are in the same VLAN regardless of which port they attach to.
D. Dynamic VLAN assignments are made through the command line interface.
Answer: B,C
With VLAN Membership Policy Server (VMPS), you can assign switch ports to VLANs dynamically, based on the source Media Access Control (MAC) address of the device connected to the port. When you move a host from a port on one switch in the network to a port on another switch in the network, the switch assigns the new port to the proper VLAN for that host dynamically.
Note: There are two types of VLAN port configurations: static and dynamic.
Incorrect Answers:
A: In a static VLAN, the administrator assigns switch ports to the VLAN, and the association does not change until the administrator changes the port assignment. However, this is not the case of dynamic VLANs.
D: The Command Line Interface is not used for dynamic VLAN assignments.Reference: Cisco Online, Configuring Dynamic Port VLAN Membership with VMPS

The network administrator maps VLAN 10 through 20 to MST instance 2. How will this information be propagated to all appropriate switches?
A. Information will be carried in the RSTP BPDUs.
B. It will be propagated in VTP updates.
C. Information stored in the Forwarding Information Base and the switch will reply on query.
D. Multiple Spanning Tree must be manually configured on the appropriate switches.
Answer: D
Recall that the whole idea behind MST is the capability to map multiple VLANs to a smaller number of STP instances. Inside a region, the actual MST instances (MSTIs) exist alongside the IST.
Cisco supports a maximum of 16 MSTIs in each region. IST always exists as MSTI number 0, leaving MSTI 1 through 15 available for use. MST must be manually configured on the all switch belongs to same MST region.

R1 and R2 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 other alternatives apply
Answer: B
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: VLAN IDs (ISL and 802.1Q) Emulated LAN names ( ATM LANE ) 802.10 SAID values (FDDI) VTP domain name VTP configuration revision number VLAN configuration, including the maximum transmission unit (MTU) size for each VLAN Frame format

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
Answer: B,C,D
VTP advertisements include: 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. 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).
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.

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