What is the most effective tool to use to determine whether there is a physical layer problem with
voice bearer trunks before escalating the trouble to the PSTN PTT carrier?

You are working in a service provider voice NOC supporting a national VoIP network. The network
underwent a capacity expansion that added voice bearer trunks to a newly deployed media
gateway. After the new trunks were configured and placed into live service, the service desk
began to receive complaints from end customers that their VoIP service is not working for certain
calls. The service desk is unable to resolve the problem and due to increasing troubles coming in,
they escalate to you.
Assuming that all physical layer option settings are verified to match carrier-provided
specifications, which action should you take to isolate the problem before escalating to the PSTN
PTT carrier?

A rollout plan from engineering has been sent to the NOC for deployment. Part of the plan involves
a complex software upgrade to a network element. The method of procedure provided by
engineering is nearly 100 individual steps long. Where do you expect to find backout procedures
to be specified?

A rollout plan from engineering has been sent to the NOC for review. The plan approves
deployment of a new router model at the customer premises for all new service activations. The
certification lab has fully tested the new router and found no issues. As a NOC engineer, you
review the plan for completeness. An item is missing from the plan to deploy the new routers.
Which missing item should be your biggest concern?

While evaluating a new hardware rollout plan before deployment, which standards should you
review to ensure that the hardware met certain environmental design guidelines?

On the Cisco IOS XR router, you have noticed lately that OSPF adjacency on one interface is
flapping occasionally; three flaps in the last 5 hours. The log in each of the three flap cases has an
error message showing that the OSPF state changed from EXCHANGE to DOWN with the
description “Neighbor Down: dead timer expired.” What is the most likely cause for this problem?

Which three of the following metrics are used to troubleshoot an incident of poor voice quality in a
service provider next-generation network? It can be assumed that adequate bandwidth is
available. (Choose three.)

A server is exhibiting intermittent performance problems. If you were to search various system
logs, which three patterns would likely apply when using the grep command? (Choose three.)

Your company provides a VoIP service. Customers are informing your call center that they are not

getting a dial tone. You are able to establish a Telnet session into the primary call manager across
the network. From the primary call manager, you are unable to ping the CPE. You are able to ping
the CPE from the secondary call manager.
After failing over to the secondary call manager, which three items should you focus on to resolve
this performance problem? (Choose three.)

An ISP has a BGP-free MPLS LDP core. The ISP provides L2VPN and L3VPN services over the
MPLS core. The ISP network monitoring tools show that whenever a new link or a link that was
taken out for maintenance is brought up, it causes a traffic outage lasting for a few seconds for
VPN and Internet traffic. What are the first two steps to mitigate this problem? (Choose two.)