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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?
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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?
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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?
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What is the role of LFIB in MPLS packet forwarding?
What is the role of LFIB in MPLS packet forwarding?
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Which action is associated with PHP optimization in MPLS networks?
Which action is associated with PHP optimization in MPLS networks?
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Where does PHP optimization typically take place within an MPLS network?
Where does PHP optimization typically take place within an MPLS network?
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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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