Question 1

A company plans to use BFD between its routers to detect a connectivity problem inside the switched network. An IPS is transparently installed between the switches. Which packets shold the IPS forward for BFD to work under all circumstances?

Options :

A : Fragmented packet with the do-not-fragment bit set

B : IP packets with broadcast IP source addresses

C : IP packets with the multicast IP source address

D : IP packet with the multicast IP destination address

E : IP packets with identical source and destination IP addresses

F : IP packets with the destination IP address 0.0.0.0.

Answer: E

Question 2

Which two control plane policer designs must be considered to achieve high availability? (Choose two.)

Options :

A : Control plane policers are enforced in hardware to protect the software path, but they are hardware platform dependent in terms of classification ability.

B : Control plane policers are really needed only on externally facing devices.

C : Control plane policers can cause the network management systems to create false alarms.

D : Control plane policers must be processed before a forwarding decision is made.

E : Control plane policers require that adequate protocols overhead are factored in to allow protocol convergence.

Answer: A,D

Question 3

Which option is a fate-sharing characteristic in regards to network design?

Options :

A : A failure of a single element causes the entire service to fail

B : It protects the network against failures in the distribution layer

C : It acts as a stateful forwarding device

D : It provides data sequencing and acknowledgment mechanisms

Answer: A

Question 4

A large service provider network has a single-level IS-IS network with 500 routers. This network has short-haul and long-haul links. Periodically, 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 is important, a design engineer is concerned about taxing CPU cycles on the older routers. Which solution protects the CPU of the older routers during the short periods of excessive flapping, yet has no impact on fast convergence for all interface failures?

Options :

A : Modify the length of time that an LSP remains in the router database without being refreshed on all routers

B : Modify hello timers on routers with short-haul links

C : Implement a delay between successive IS-IS LSP packet transmissions on routers with long-haul links

D : Implement LSP generation throttling on routers with long-haul links

Answer: C

Question 5

A financial services company runs HSRP at the edge of its network to allow for redundancy for the default gateway for its servers. The CTO of the company is concerned that the failover time for HSRP is too slow and a different mechanism should be used. The network engineer disagrees and believes that HSRP can provide the required fast down detection and failover for the edge of the network. Which option is the fastest down detection and failover solution for this HSRP environment?

Options :

A : Limit the Layer 2 broadcast domain.

B : Decrease the HSRP timers.

C : Implement BFD.

D : Migrate from IEEE 802.1D to 802.1w.

E : Implement HSRP preemption.

Answer: C

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