Exam:  Cisco 642-873

Title    :  Designing Cisco Network Service Architectures Exam

1. Which of these Layer 2 access designs does not support VLAN extensions?
A. FlexLinks
B. loop-free U
C. looped square
D. looped triangle
E. loop-free inverted U
Answer: B

2. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual (counter-rotating) ring topology?
A. DTP
B. RPR
C. SDH
D. CWDM
E. DWDM
Answer: B

3. Which three of these are elements of the Cisco Unified Wireless Network architecture? (Choose three)
A. cell phones
B. remote access
C. mobility services
D. network management
E. network unification
F. network decentralization
Answer: CDE

4. Refer to the exhibit. Which two of these are correct regarding the recommended practice for distribution layer design? (Choose two.)
 
A. use a redundant link to the core
B. use a Layer 2 link between distribution switches
C. never use a redundant link to the core because of convergence issues
D. use a Layer 3 link between distribution switches with route summarization
E. use a Layer 3 link between distribution switches without route summarization
Answer: AD

5. Which of these terms refers to call issues that cause variations in timing or time of arrival?
A. queuing
B. jitter
C. packet loss
D. digitized sampling
E. signal-to-noise ratio ratio
Answer: B

6. Which two of these are characteristics of an IDS sensor? (Choose two.)
A. passively listens to network traffic
B. is an active device in the traffic path
C. has a permissive interface that is used to monitor networks
D. traffic arrives on one IDS interface and exits on another
E. has a promiscuous interface that is used to monitor the network
Answer: AE

7. In base e-Commerce module designs, where should firewall perimeters be placed?
A. core layer
B. Internet boundary
C. aggregation layer
D. aggregation and core layers
E. access and aggregation layers
Answer: A

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