At each hop in an MPLS network, what happens to the TTL field in the MPLS label?

It is reset to the original IP TTL value.

What type of packet does the egress LSR receive when Penultimate Hop Popping (PHP) is enabled?

A packet with the full label stack

A packet with an additional label pushed

What is the primary benefit of Penultimate Hop Popping (PHP) in an MPLS network?

It reduces the workload on the egress LSR.

It eliminates the need for the ingress LSR to push a label.

It increases the TTL of the packet.

It reduces the number of labels in the network.

A transit LSR receives an MPLS packet with an incoming label of 400. The LFIB does not contain an entry for label 400. What will the router do with the packet?

Push a new label onto the packet and forward it to the next hop.

Forward the packet based on the IP destination address.

Drop the packet and generate an ICMP error message to the source.

Pop the label and forward the packet to the next hop.

An ingress LSR receives an IP packet destined to 203.0.113.0/24. The routing table shows two possible next hops: one is an LSP with a label of 100, and the other is a directly connected interface with no label. The LSP is preferred in the routing table. What will the ingress LSR do with the packet?

Forward the packet out the directly connected interface without a label because it is simpler.

Drop the packet because there are two possible next hops.

Pop label 100 and forward the packet based on the IP destination address.

Push label 100 onto the packet and forward it out the interface associated with the LSP.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 7Objective 3

End-To-End Packet Flow and Forwarding JN0-364 Practice Questions (Page 1)

Part of the Multiprotocol Label Switching (MPLS) domain, which makes up ~16% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–10 in this domain), expect 1–1 from this objective — we provide 28 practice questions to prepare you well beyond it. (estimate)

28questions here

6free pages

8concepts

Questions 1–5

1foundation · easy
At each hop in an MPLS network, what happens to the TTL field in the MPLS label?
Select an answer first
2foundation · easy
What type of packet does the egress LSR receive when Penultimate Hop Popping (PHP) is enabled?
Select an answer first
3foundation · easy
What is the primary benefit of Penultimate Hop Popping (PHP) in an MPLS network?
Select an answer first
4expert · hard
A transit LSR receives an MPLS packet with an incoming label of 400. The LFIB does not contain an entry for label 400. What will the router do with the packet?
Select an answer first
5expert · hard
An ingress LSR receives an IP packet destined to 203.0.113.0/24. The routing table shows two possible next hops: one is an LSP with a label of 100, and the other is a directly connected interface with no label. The LSP is preferred in the routing table. What will the ingress LSR do with the packet?
Select an answer first

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