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Cisco 642-891 Exam -

Free 642-891 Sample Questions:

1.On a multilayer Catalyst switch, which interface command is used to convert a Layer 3 interface to a Layer 2 interface?
A. switchport
B. no switchport
C. switchport mode access
D. swithport access vlan vlan-id
Answer: A

2.When IP multicast is enabled via PIM, which mode uses the flood and prune method?
A. PIM sparse-dense
B. Bidir-PIM
Answer: D

3.A medium-sized network with a redundant topology that uses core and access switches is experiencing intermittent
end-station accessibility. The root bridge is on one of the core switches. It is determined that the problem occurs during STP convergence and that accessibility issues depend on the STP state of the individual switch port. What is the best way to decrease STP convergence time in this situation?
A. Enable PortFast on the core switches to accelerate the choice of a new root port.
B. Enable UplinkFast on the VLAN that is having the most accessibility problems.
C. Enable UplinkFast on the wiring closet switches at the edge of the network.
D. Enable PortFast on all IOS based switches that have been configured for bridge priority.
Answer: C

4.Which VTP information does a Catalyst switch advertise on its trunk ports when using VTP? (Choose two.)
A. VTP mode
B. STP root status
C. negotiation status
D. management domain
E. configuration revision number
Answer: D, E

5.Which two methods advertise internal networks to external ISPs via BGP? (Choose two.)
A. using aggregate routes
B. disabling synchronization
C. forcing the next-hop address
D. defining routes via the network statement
Answer: A, D

6.Which two table types are CEF components?(Choose two.)
A. forwarding information base
B. adjacency tables
C. neighbor tables
D. caching tables
E. route tables
Answer: A, B

7.Which three IP addresses are valid multicast addresses? (Choose three.)
Answer: C, D, E

8.Given the following configuration on a switch interface, what happens when a host with the MAC address of
0003.0003.0003 is directly connected to the switch port? switchport mode access switchport port-security switchport port-security maximum 2 switchport port-security mac-address 0002.0002.0002 switchport port-security violation shutdown
A. The port will shut down.
B. The host will be allowed to connect.
C. The host will be refused access.
D. The host can only connect through a hub/switch where 0002.0002.0002 is already connected.
Answer: B

9.Why should iBGP sessions be fully meshed within a Transit AS?
A. BGP requires redundant TCP sessions between iBGP peers.
B. A full mesh allows for optimal routing within the Transit AS.
C. Routes learned via iBGP are never propagated to other eBGP peers.
D. Routes learned via iBGP are never propagated to other iBGP peers.
E. Routes learned via eBGP are never propagated to other iBGP peers.
Answer: D

10.A new workstation has consistently been unable to obtain an IP address from the DHCP server when the workstation boots. Older workstations function normally, and the new workstation obtains an address when manually forced to renew its address. What should be configured on the switch to allow the workstation to obtain an IP address at boot?
A. UplinkFast on the switch port connected to the server
B. BackboneFast on the switch port connected to the server
C. PortFast on the switch port connected to the workstation
D. trunking on the switch
Answer: C




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