What is the purpose of penultimate hop popping (PHP) in an MPLS network?

To allow the egress router to perform an IP lookup

To reduce the number of labels in the stack

To enable the ingress router to push multiple labels

To improve forwarding efficiency by having the penultimate router pop the label

You are examining a Junos router in an MPLS network. You notice that the routing table contains the loopback address of a remote PE router, but the MPLS forwarding table does not contain a label entry for that destination. What is the most likely cause of this discrepancy?

The remote PE's loopback address is not reachable via the IGP, so the route is in the routing table but not usable.

The MPLS forwarding table only contains entries for directly connected interfaces, not remote destinations.

The routing table is populated by BGP, while the MPLS forwarding table is populated by OSPF, causing a mismatch.

LDP has not established a session with the remote PE, so no label binding has been received for the loopback address.

What is the purpose of having multiple labels in an MPLS label stack?

To improve the security of the MPLS network

To support services such as VPNs and traffic engineering

To increase the bandwidth of the LSP

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

Domain 7Objective 5

MPLS and Routing Tables JN0-364 Practice Questions (Page 2)

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 23 practice questions to prepare you well beyond it. (estimate)

23questions here

5free pages

8concepts

Questions 6–10

6foundation · easy
Which component of an MPLS forwarding entry determines the outgoing interface for a labeled packet?
Select an answer first
7foundation · easy
In an MPLS router, which table is used by the control plane to make routing decisions?
Select an answer first
8foundation · easy
What is the purpose of penultimate hop popping (PHP) in an MPLS network?
Select an answer first
9application · medium
You are examining a Junos router in an MPLS network. You notice that the routing table contains the loopback address of a remote PE router, but the MPLS forwarding table does not contain a label entry for that destination. What is the most likely cause of this discrepancy?
Select an answer first
10foundation · easy
What is the purpose of having multiple labels in an MPLS label stack?
Select an answer first

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MPLS and Routing Tables JN0-364 Practice Questions (Page 2)

Questions 6–10

Which component of an MPLS forwarding entry determines the outgoing interface for a labeled packet?

In an MPLS router, which table is used by the control plane to make routing decisions?

What is the purpose of penultimate hop popping (PHP) in an MPLS network?

You are examining a Junos router in an MPLS network. You notice that the routing table contains the loopback address of a remote PE router, but the MPLS forwarding table does not contain a label entry for that destination. What is the most likely cause of this discrepancy?

What is the purpose of having multiple labels in an MPLS label stack?

Keep studying — Multiprotocol Label Switching (MPLS)