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Questions and Answers
What is the purpose of Penultimate Hop Popping (PHP) in an MPLS network?
What is the purpose of Penultimate Hop Popping (PHP) in an MPLS network?
- To add more labels to the packets for redundancy.
- To slow down packet forwarding within the MPLS network.
- To optimize MPLS performance by reducing CPU effort on Edge LSRs. (correct)
- To optimize MPLS performance by increasing CPU effort on Edge LSRs.
Where is label lookup performed in MPLS packet forwarding?
Where is label lookup performed in MPLS packet forwarding?
- Egress LSR only
- FIB only
- LFIB only (correct)
- Both LFIB and FIB
What happens in a double lookup scenario in MPLS packet forwarding?
What happens in a double lookup scenario in MPLS packet forwarding?
- LFIB lookup is performed twice before forwarding the IP packet. (correct)
- The label is removed twice from the packet.
- Two different labels are added to the packet.
- FIB lookup is performed twice to find the next-hop address.
When does Penultimate Hop Popping (PHP) occur within an MPLS domain?
When does Penultimate Hop Popping (PHP) occur within an MPLS domain?
What does the pop or implicit null label value of 3 indicate to a neighbor in an MPLS network?
What does the pop or implicit null label value of 3 indicate to a neighbor in an MPLS network?
Which router in an MPLS domain removes the label before the last hop?
Which router in an MPLS domain removes the label before the last hop?
What is the role of LFIB in MPLS packet forwarding?
What is the role of LFIB in MPLS packet forwarding?
Which action is associated with PHP optimization in MPLS networks?
Which action is associated with PHP optimization in MPLS networks?
Where does PHP optimization typically take place within an MPLS network?
Where does PHP optimization typically take place within an MPLS network?
What is a common benefit of using Penultimate Hop Popping (PHP) in an MPLS network?
What is a common benefit of using Penultimate Hop Popping (PHP) in an MPLS network?
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