Cisco Certified Design Expert Practical Sample Questions:

1. A new video multicast application is deployed in the network. The application team wants to use the 239.0.0.1 multicast group to stream the video to users. They want to know if this choice will impact the existing multicast design. What impact will their choice have on the existing multicast design?

A) Because 239.0.0.1 is a private multicast range, the rendezvous point has to send out constant group updates that will have to be processed by the CPU and hosts.
B) Because 239.0.0.1 is a private multicast range, a flood of PIM packets that have to be processed by the CPU and hosts will be sent by the routers in the network.
C) The multicast application sends too many packets into the network and the network infrastructure drops packets.
D) The 239.0.0.1 group address maps to a system MAC address, and all multicast traffic will have to be sent to the CPU and flooded out all ports.

2. You are consultant network designer for a large GET VPN deployment for a large bank with International coverage. Between 1800 and 2000 remote locations connect to the central location through four hubs using an MPLS backbone and using two keys servers. The bank is concerned with security and replay attacks. Which two actions should you use to tune the GET VPN to meet the bank requirements? (Choose two)

A) Increase the cryptographic key size.
B) Replace unicast rekey with multicast rekey.
C) Reduce the Dead Peer Detection periodic timer.
D) Increase the TEK and KEK lifetime.
E) Reduce the SAR clock interval duration

3.

4. When designing a network .Which method can be used to control the exit point for traffic an autonomous system, at the layer 3 control plane?

A) Setting the site of Origin extended community.
B) Tuning the metric of the under-tying IGP.
C) Prepending AS path.
D) Tuning the multi-exit discriminator.

5. You are redesigning a single-level IS-IS network with 500 routers, which have short-haul and long-haul links Most of the time the routing domain is stable, but periodically interfaces on long-haul links bounce for a short period of time , causing 10 to 20 flaps in a few minutes. The probable cause is local road construction.
Although fast convergence important, the client has concerns about taxing CPU cycles on the older routing platforms. What change should you recommend that both protects the CPU of the older routers during the short periods of excessive flapping, yet does not have an impact on fast convergence for all interface failures?

A) Modify the length of time than an LSP remains in the router database without being refreshed on all routers
B) Implement a delay between successive IS-IS LSP packet transmissions on routers with long-haul links
C) Implement LSP generation throttling on routers with long-haul links
D) Modify hello timers on routers with short-haul links

Solutions: