A network engineer is examining an MPLS packet and sees a label with the value 3 and the bottom-of-stack bit set to 1. What is the significance of this label?

It is a multicast label, used for multicast forwarding.

It is a router alert label, used for diagnostics.

It is an explicit-null label, used for QoS preservation.

It is an implicit-null label, indicating that the penultimate hop should pop the label.

A network administrator is troubleshooting an MPLS network and needs to verify which label a neighboring router has advertised for a specific FEC. Which table should the administrator examine on the local router?

The Label Information Base (LIB)

The Label Forwarding Information Base (LFIB)

An MPLS router has a LIB entry for a FEC with a label binding from a neighbor. However, the LFIB does not have an entry for that FEC. What is the most likely reason?

The router has not configured LDP.

The router has not enabled MPLS on the outgoing interface.

The label binding is not valid.

The router does not have a route to the FEC in its routing table.

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

Domain 7Objective 4

Labels and the Label Information Base JN0-364 Practice Questions (Page 4)

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

19questions here

4free pages

6concepts

Questions 16–19

16foundation · easy
Which field in an MPLS label indicates whether the label is the last label in the label stack?
Select an answer first
17expert · medium
A network engineer is examining an MPLS packet and sees a label with the value 3 and the bottom-of-stack bit set to 1. What is the significance of this label?
Select an answer first
18application · medium
A network administrator is troubleshooting an MPLS network and needs to verify which label a neighboring router has advertised for a specific FEC. Which table should the administrator examine on the local router?
Select an answer first
19expert · medium
An MPLS router has a LIB entry for a FEC with a label binding from a neighbor. However, the LFIB does not have an entry for that FEC. What is the most likely reason?
Select an answer first

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Labels and the Label Information Base JN0-364 Practice Questions (Page 4)

Questions 16–19

Which field in an MPLS label indicates whether the label is the last label in the label stack?

A network engineer is examining an MPLS packet and sees a label with the value 3 and the bottom-of-stack bit set to 1. What is the significance of this label?

A network administrator is troubleshooting an MPLS network and needs to verify which label a neighboring router has advertised for a specific FEC. Which table should the administrator examine on the local router?

An MPLS router has a LIB entry for a FEC with a label binding from a neighbor. However, the LFIB does not have an entry for that FEC. What is the most likely reason?

Keep studying — Multiprotocol Label Switching (MPLS)