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Exam A
QUESTION 1
What is a benefit of CEF switching?
A. CEF supports IP source prefix-based switching using the FIB.
B. CEF uses less memory than fast switching uses.
C. CEF is less CPU intensive than fast switching is.
D. CEF provides Netflow statistics with minimum CPU overhead.
E. CEF allows multiple data planes to share a common control plane.

Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 2
What is a major drawback of using traditional IP routing over an ATM network when connecting multiple sites?
A. Each ATM switch in the path has to perform Layer 3 routing lookup.
B. ATM virtual circuits have to be established between the different sites.
C. There is high ATM management overhead between the ATM switch and the router at each site.
D. Each ATM switch has to be manually configured to participate in Layer 3 routing.
E. There is high PNNI overhead.

Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 3
Refer to the diagram. What problem can be caused by the second P router summarizing the loopback address of the egress PE router?

A. The first P router will be faced with a VPN label which it does not understand.
B. The second P router will be faced with a VPN label which it does not understand.
C. The egress PE router will not be able to establish a label switch path (LSP) to the ingress PE router.
D. A label switch path (LSP) will be established from the ingress PE router to the egress PE router, an event that is not desirable.

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Exam A
QUESTION 1
Which statement is true about the hardware requirements of MPLS?
A. Because you do not need to run a routing protocol on P-routers, they require less memory than routers supporting classic IP routing.
B. Because of the additional processing and memory requirements needed to build the LFIB, MPLS is only available on high end routers.
C. MPLS is available on low end routers, built their use is limited because of the additional processing and memory requirements needed to build the LFIB.
D. Because P-routers do not need to carry routes outside the MPLD domain, they require less memory than routers that support the same application using classic IP routing.
Correct Answer: C Section: (none) Explanation
Explanation/Reference:
QUESTION 2
If aggregation (summarization) were to be used on a network with ATM LSRs. What would result?
A. LSPs would be broken in two.
B. There would be extra LFIB entries.
C. The size of the LFIB table would increase.
D. There would be extra LIB entries
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
QUESTION 3
What is true of MPLS TE?
A. Only the ingress LSR must see the entire topology of the network.
B. Every LSR needs additional information about links in the network, available resources, and constraints.
C. Every core router must be able to create an LSP tunnel on demand.
D. Both RSVP and CR-LDP are used in conjunction to establish traffic engineering (TE) tunnels and to propagate the labels.
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
QUESTION 4
What is a major drawback of using traditional IP routing over an ATM network when connecting multiple sites?
A. Each ATM switch in the path has to perform Layer 3 routing lookup.
B. ATM virtual circuits have to be established between the different sites.

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