| Exam 642-887 | Question id=3274 | MPLS/LDP in a Service Provider IP NGN Environment |
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 routed back to the source. | |
| B. |
The packet is dropped and an ICMP "time exceeded" message is IP routed back to the sender. | |
| C. |
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. | |
| 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 label switched back to the source. |