You are working for a large service provider. The engineering team has requested that operations
roll out new four-port 10-Gigabit Ethernet line cards in every 7600 Series Router chassis in the
network in advance of announcing new services that will use these high-speed interfaces. During
the meeting, engineering and the certification lab state that they have fully tested the new line
cards with no problems identified. Realizing that it has been over a year since the Cisco IOS
Software was last upgraded in the network and a Cisco IOS upgrade is required, what questions
should you ask of the engineering team before proceeding with scheduling maintenance windows
to upgrade the network? (Choose two.)

A trouble ticket has been escalated from the service desk to you as a Tier 2 NOC engineer. The
customer is complaining about slow application response time. The problem is between end-user
workstations and a CRM application hosted on a redundant pair of servers in a data center. What
are the two initial actions to further troubleshoot the network? (Choose two.)

Several customers are complaining about slow network throughput when trying to access a
company document management system. This slow throughput is impacting business for these
customers due to lost productivity. The service desk followed normal procedures, was unable to
resolve the problem, and escalated the trouble ticket to you, the Tier 2 NOC engineer. You have
done your own analysis and believe that you have found the root cause but are not entirely
certain.
Which three steps should you take to verify your resolution? (Choose three.)

You are working as a Tier 3 NOC engineer at a large service provider. Supporting the core
network is part of your job responsibility. An escalation has come to you after Tier 2 determines
that a problem lies within the core of the network and is affecting every customer. You have

analyzed the information in the trouble ticket, performed your own troubleshooting, and have
determined that a BGP session is flapping between two core routers. Which two steps should you
take before escalating to the router vendor? (Choose two.)

You are working at a large service provider supporting the core MPLS network. You have
determined that a line card in one of the core routers has failed. Which two steps should you take
before requesting that a technician be dispatched to the location to replace the card? (Choose
two.)

You are working at a service provider supporting the core network. While proactively monitoring
syslog, you notice that two power supplies have failed on one of the core routers. The router has
five power hot-swappable supplies in total. Three are required to be working to support the power
draw of the router. At this point, the router is still functioning correctly. It is now several hours
before peak traffic will be present on the network. The next safe time for performing physical
maintenance is not until after the peak traffic window. Which two steps should you take to
minimize network impact during peak traffic? (Choose two.)

Users have complained recently about their experience with a collaboration tool that is being used
on different international locations on your network. The collaboration tool uses IP precedence of
“4” for all the traffic that runs over your network. Upon investigating the problem, you noticed that
the tool worked fine most of the time. You observed that video frames would freeze occasionally
for a short time, and some collaboration features had slow responses. The IT department has
been engaged, and they believe that the problem is with the network transport. You tried end-toend extended pings by using the ToS value of 128 and noticed a high round-trip time on some of
the ping packets. To the best of your knowledge, all the routers in the forwarding path are
distributed architecture, hardware-based forwarding devices, and the entire path is QoS-enabled.
What should be the next three steps in identifying the root cause? (Choose three.)

A large IPTV service provider primarily uses multicast for delivering IPTV services to its
customers. The service provider delivers digital television channels to home viewers by using a
set-top box as a home appliance and controls this device through its video middleware. Each
video channel uses a unique multicast group address. Recently, some channels have higher
channel change times; to alleviate this problem, a number of solutions were discussed between
the operations and engineering groups. Adding to the complexity of the issue is the fact that the
business has been growing, and the service provider made acquisitions both in its home operating

market and new geographic locations. These changes have made the management of source and
group addresses a major concern. The engineering team thinks that using static joins for popular
channels at the edge routers and moving away from Sparse Mode to SSM-based forwarding will
improve performance issues.
What are two valid concerns for the operations group? (Choose two.)

A service provider allowed private IPv6 BGP peering with a university research network. On
receiving IPv6 traffic, one Cisco 12000 Series Router that is located in the path of IPv6 traffic
experienced high CPU use on its single-port OC192 line card that caused OSPF adjacency to
drop on its port. Prior to receiving IPv6 traffic, this OC192 port was passing approximately 1 Gb of
IPv4 traffic without any noticeable CPU use. What are two possible reasons for this performance
problem? (Choose two.)

In addition to a DoS attack, what are three reasons that cause an increase in the CPU use of a
route processor or the line card of a router? (Choose three.)