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Cisco 10S Platform Switching Mechanisms Quiz

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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?

On the Egress LSR (D) 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?

Use PHP for packet forwarding (A) Signup and view all the answers

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

Penultimate router (A) Signup and view all the answers

What is the role of LFIB in MPLS packet forwarding?

Performing label lookups (A) Signup and view all the answers

Which action is associated with PHP optimization in MPLS networks?

Removing labels at second last hop within an LSP. (D) Signup and view all the answers

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

At the Egress LSR. (C) Signup and view all the answers

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

Optimizing network performance. (A) Signup and view all the answers