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642-812 Exam

Building Cisco Multilayer Switched Networks

Exam Number/Code : 642-812
Exam Name : Building Cisco Multilayer Switched Networks
Questions and Answers : *** Q&As.
Update Time: 2011-10-24
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Exam : Cisco 642-812
Title : BCMSN - Building Converged Cisco Multilayer Switched Networks

1. Which statement describes the function of a trust boundary?
A. Trust boundaries determine whether certain types of traffic can pass.
B. Trust boundaries are a point in the network where decisions about CoS markings on incoming packets are made.
C. Trust boundaries are a point in the network where QoS functionality begins and ends.
D. Trust boundaries are points in the network where Layer 2 CoS markings are converted to Layer 3 DSCP or IP precedence markings.
Answer: B

2. Refer to the exhibit. Which switch interface configuration command would automatically configure quality of service (QoS) for voice over IP (VoIP) within a QoS domain?
A. auto qos voip cisco-phone
B. mls qos trust
C. switchport priority extend cos 7
D. switchport priority extend trust
Answer: A

3. Refer to the exhibit. Dynamic ARP inspection (DAI) is enabled on switch SW_A only. Both Host_A and Host_B acquire their IP addresses from the DHCP server connected to switch SW_A. What would the outcome be if Host_B initiated an ARP spoof attack toward Host_A ?
A. The spoof packets will be inspected at the ingress port of switch SW_A and will be permitted.
B. The spoof packets will be inspected at the ingress port of switch SW_A and will be dropped.
C. The spoof packets will not be inspected at the ingress port of switch SW_A and will be permitted.
D. The spoof packets will not be inspected at the ingress port of switch SW_A and will be dropped.
Answer: C

4. Refer to the exhibit. Which Catalyst switch interface command would be used to cause the switch to instruct the phone to override the incoming CoS from the PC before forwarding the packet to the switch?
A. switchport priority extend trust
B. switchport priority extend cos 2
C. switchport priority extend cos 11
D. mls qos cos 2
E. mls qos cos 2 override
Answer: B

5. Which statement is true about utilizing a data network for voice traffic?
A. Adding bandwidth to the data network is the primary solution to provide for the needs of voice traffic.
B. Because voice traffic volume cannot be calculated, network bandwidth requirements must be determined from an existing installation.
C. Voice traffic will require some form of QoS mechanisms in most networks.
D. Voice traffic will require some form of QoS implementation only in congested networks.
E. Network congestion must be totally eliminated to provide proper voice traffic performance.
Answer: C