| Exam 642-887 | Question id=3205 | QOS in a Service Provider IP NGN Environment |
Which statement is correct regarding the default MPLS TTL behavior?
| A. |
When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will set the MPLS Label TTL field to 255. | |
| B. |
When an ingress edge LSR receives an IP packet, it will decrement the IP TTL field by 1; then it will copy the decremented IP TTL field into the MPLS Label TTL field. | |
| C. |
When an ingress edge LSR receives an IP packet, it will just copy the IP TTL field into the MPLS Label TTL field. | |
| D. |
When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the MPLS Label TTL field by 1. | |
| E. |
When an ingress edge LSR receives an IP packet, it will copy the IP TTL field into the MPLS Label TTL field first; then it will only decrement the IP TTL field by 1. |