Cisco 10S Platform Switching Mechanisms Quiz
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Questions and Answers

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?

  • Egress LSR only
  • FIB only
  • LFIB only (correct)
  • Both LFIB and FIB
  • 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?

    <p>On the Egress LSR</p> Signup and view all the answers

    What does the pop or implicit null label value of 3 indicate to a neighbor in an MPLS network?

    <p>Use PHP for packet forwarding</p> Signup and view all the answers

    Which router in an MPLS domain removes the label before the last hop?

    <p>Penultimate router</p> Signup and view all the answers

    What is the role of LFIB in MPLS packet forwarding?

    <p>Performing label lookups</p> Signup and view all the answers

    Which action is associated with PHP optimization in MPLS networks?

    <p>Removing labels at second last hop within an LSP.</p> Signup and view all the answers

    Where does PHP optimization typically take place within an MPLS network?

    <p>At the Egress LSR.</p> Signup and view all the answers

    What is a common benefit of using Penultimate Hop Popping (PHP) in an MPLS network?

    <p>Optimizing network performance.</p> Signup and view all the answers

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