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642-891 braindumps Description
Questions and Answers:330 Q&As
Updated: 2009-09-06
Exam Number/Code: 642-891
Exam Name: Composite Exam
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Real 642-891 questions and answers
Exam : Cisco 642-891
Title : Composite Exam
1.
Answer: CE
2. When IP multicast is enabled via PIM, which mode uses the flood and prune method?
A. PIM sparse-dense
B. Bidir-PIM
C. PIM-RP
D. PIM-DM
E. PIM-SM
Answer: D
2. 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: DE
3. Given the above partial configuration, which two statements are true about VLAN traffic? (Choose two.)
A. VLANs 1-5 will be blocked if fa0/10 goes down.
B. VLANs 1-5 will use fa0/10 as a backup only.
C. VLANs 6-10 will use fa0/10 as a backup only.
D. VLANs 6-10 have a port priority of 128 on fa0/10.
E. VLANs 1-10 are configured to load share between fa0/10 and fa0/12.
Answer: CE
4. 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: AD
5. 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
