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Question 27 - 4A0-115 discussion

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Examine the exhibit.

Which of the following actions is performed by PEI after it receives a BUM packet from CEI?

A.
PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
Answers
A.
PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
B.
PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
Answers
B.
PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
C.
PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
Answers
C.
PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
D.
PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
Answers
D.
PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
Suggested answer: C

Explanation:

PE1 sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2. The ESI label is used to implement the split-horizon mechanism and prevent traffic duplication. The packet sent to PE3 does not need an ESI label because PE3 is connected to the same Ethernet segment as PE1.

asked 23/09/2024
John Murphy
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