In MPLS label processing, what does the 'swap' operation do?

Adds a new label on top of the existing label stack

Replaces the incoming label with a new outgoing label

Removes the top label from the label stack

Changes the label value and also modifies the IP header fields

A service provider wants to reduce the number of IP lookups in the core network. They plan to use MPLS so that core routers forward packets based on labels. Which statement correctly describes the MPLS forwarding paradigm?

Core LSRs forward based on the IP destination address only when the label is not present.

Core LSRs still perform a full IP longest-prefix match but use the label to select the outgoing interface.

Core LSRs forward packets using the label as an index into the LFIB, not by performing a longest-prefix match on the IP destination.

Core LSRs use the label to determine the next hop but still need to inspect the IP header for QoS.

A network engineer is analyzing an MPLS packet capture. The engineer sees a label stack with two labels. The engineer needs to determine which label is the bottom of the stack. Which field in the MPLS shim header indicates the bottom of the stack?

The S bit (bottom-of-stack bit)

A service provider is deploying MPLS in its core network. The edge router that connects a customer site to the MPLS domain receives an IP packet and assigns a label to it before forwarding it into the core. What is the role of this edge router in the MPLS network?

Provider Edge (PE) router only if it runs BGP

A service provider is designing an MPLS core. They want to ensure that core routers do not need to perform a route lookup on the IP destination address for labeled packets. Which table should the core routers use to forward labeled packets?

Label Forwarding Information Base (LFIB)

Address Resolution Protocol (ARP) cache

Forwarding Information Base (FIB)

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

Domain 7Objective 1

MPLS Terminology JN0-364 Practice Questions (Page 3)

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

4concepts

Questions 11–15

11foundation · easy
In MPLS label processing, what does the 'swap' operation do?
Select an answer first
12application · easy
A service provider wants to reduce the number of IP lookups in the core network. They plan to use MPLS so that core routers forward packets based on labels. Which statement correctly describes the MPLS forwarding paradigm?
Select an answer first
13application · easy
A network engineer is analyzing an MPLS packet capture. The engineer sees a label stack with two labels. The engineer needs to determine which label is the bottom of the stack. Which field in the MPLS shim header indicates the bottom of the stack?
Select an answer first
14application · easy
A service provider is deploying MPLS in its core network. The edge router that connects a customer site to the MPLS domain receives an IP packet and assigns a label to it before forwarding it into the core. What is the role of this edge router in the MPLS network?
Select an answer first
15application · easy
A service provider is designing an MPLS core. They want to ensure that core routers do not need to perform a route lookup on the IP destination address for labeled packets. Which table should the core routers use to forward labeled packets?
Select an answer first

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