Nortel Technology Standards and Protocol for Converged Networks.

Transcription

1 Nortel Technology Standards and Protocol for Converged Networks

2 D. Optivity Telephony Manager (OTM) Answer: D QUESTION: 67 Which component provides remote VoIP network management capability? A. 323 Manager B. Unified Manager C. Peer Network Manager D. Coordinated Dialing Plan Manager Answer: B QUESTION: 68 A customer has an IP WAN with multiple routers supporting various data applications. They have added support for VoIP to take advantage of enhanced services and bandwidth efficiencies. The voice traffic has frequently been distorted, and technicians suspect that the cause is serial delay (jitter) within the routing scheme. Which two viable approaches can the customer use in the router setup to help reduce this issue? (Choose two) A. Implement Layer 2 fragmentation on the WAN links. B. Use voice compression for packets tagged as voice. C. Use small packets for VoIP so that less time is spent accumulating voice samples. D. Use large packets for VoIP so that more of a voice sample can be sent at one time. Answer: A, C QUESTION: 69 A customer plans to implement VoIP within the year. You are assigned to assess the network status and recommend changes that may be required to support VoIP. Given the following network conditions:?the two core routers have eight of ten slots populated.?the Central Processing Unit (CPU) usage of the core routers is at a baseline of 85%.?One Open Shortest Path First (OSPF) area is configured for every two interfaces.?routers are based on a distributed processing architecture.?each core router maintains four Link State Databases (LSDs).?New code is to be loaded to make the routers Differentiated Services (DiffServ) capable. Which action should you take to reduce the CPU utilization in preparation for DiffServ queuing? 34

3 A. Add a passive standby CPU. B. Reduce the number of OSPF areas on each router. C. Enable the compression accelerator card on each router. D. Do nothing the performance of the installed core routers CANNOT be improved. Answer: B QUESTION: 70 Click the exhibit button. Given the VoIP over Frame Relay network in the exhibit and the following network information:?analysis of the traffic statistics determines that there is normally enough bandwidth to support both data and voice traffic without incident.?point- Of-Sale (POS) applications send an updated data file to the NT servers at frequent, irregular intervals causing VoIP calls to drop or clip from time to time.?the Committed Information Rate (CIR) is being exceeded and some VoIP and data traffic is marked as Discard Eligible (DE). Which action should be implemented to prevent the VoIP traffic from being marked as DE by the Frame Relay network? A. Implement traffic policies at the sub-interface level. B. Increase the CIR of each Frame Relay circuit. C. Implement Differentiated Services (DiffServ) queuing. D. Implement Forward Explicit Congestion Notification/Backward Explicit Congestion Notification (FECN/BECN) message suppression. 35

4 Answer: A QUESTION: 71 Click the exhibit button. Given the network exhibit and the following network information:?the usage of core router A is at a baseline of 70%.?The usage of core router B is at a baseline of 95%.?Differentiated Services (DiffServ) is NOT enabled on core routers A and B.?802.1p prioritization is enabled on all network devices.?each policy switch stack is fully populated. The customer wants to enable DiffServ queuing on core routers A and B but is concerned about the current CPU usage. Which network change should you make to produce the greatest reduction in router CPU usage? 36

5 A. Consolidate the policy switch stacks to reduce the number of uplinks to the routers. B. Evenly distribute T1/E1 circuits among the routers and move one of the call servers to core router A. C. Evenly distribute T1/E1 circuits among the routers and move the call servers to a policy switch stack. D. Install a Layer 2 QoS switch between the policy switch stacks and the routers, and move the call servers to the new switch. Answer: D QUESTION: 72 Click the exhibit button. Given the VoIP over Frame Relay network in the exhibit and the following network information:?differentiated Services (DiffServ) is installed and configured properly.?the Maximum Transmission Unit (MTU) size on all circuits is set to 256 kbps.?traffic shaping policies are in place to guarantee VoIP traffic receives a maximum of 70% of the Committed Information Rate (CIR) bandwidth. As traffic to the NT server increases, which two conditions should you expect to see? (Choose two.) 37

6 A. Data traffic will be discarded. B. Data traffic will experience higher latency. C. VoIP calls CANNOT be placed to Router B. D. All VoIP calls will experience quality issues. E. VoIP calls through Router B will experience quality issues. F. VoIP calls from Router A will be rerouted through Router D Answer: A, B 38

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