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NO.1 Which option describes what happens when a labelled packet with a TTL of 1 is received by an
LSR?
A. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time
exceeded" message is generated and label switched back to the source.
B. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring
router back on a new path toward the source.
C. The packet is dropped and an ICMP "time exceeded" message is IP routed back to the sender.
D. The packet is dropped and an ICMP "time exceeded" message is label-switched from the expiring
router on the same label switched path toward the destination and then back to the originating
source.
E. The packet is forwarded on to the next router where its TTL expires and from where an ICMP "time
exceeded" message is generated and routed back to the source.
Answer: D

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NO.2 What is the term that is used for the label that an LSR assigns and distributes to other LSRs in
MPLS?
A. Explicit Null
B. Aggregate
C. Remote
D. Local
E. Explicit
Answer: D

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