A service provider is designing an MPLS network and wants to minimize the processing load on the egress LSR. They are considering enabling PHP. Which statement correctly describes the trade-off of using PHP?

PHP increases the processing load on the egress LSR because it must handle the label pop.

PHP requires the egress LSR to push a new label onto the packet.

PHP reduces the egress LSR's label processing, but the egress must still perform an IP routing lookup to forward the packet.

PHP eliminates the need for the egress LSR to perform any forwarding decision.

What does an egress LSR do with the label stack before forwarding the packet based on the IP routing table?

It swaps the top label with a new one.

It pushes a new label onto the stack.

It forwards the packet without modifying the label stack.

A transit LSR receives an MPLS packet with label 150. The LFIB has two entries: one for label 150 with outgoing label 250 and next hop 192.0.2.2, and another for label 150 with outgoing label 260 and next hop 192.0.2.3. The router uses load balancing across equal-cost paths. What will the router do with the packet?

Drop the packet because the incoming label is ambiguous.

Select one of the two LFIB entries based on the load-balancing algorithm and swap label 150 with the corresponding outgoing label.

Duplicate the packet and send it out both interfaces.

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

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 5)

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 21–25

21application · medium
A packet travels through an MPLS network with four LSRs: ingress, transit1, transit2, and egress. The ingress pushes label 100. Transit1 swaps to 200. Transit2 swaps to 300. The egress pops the label. What is the label value on the packet when it arrives at transit2?
Select an answer first
22expert · hard
A service provider is designing an MPLS network and wants to minimize the processing load on the egress LSR. They are considering enabling PHP. Which statement correctly describes the trade-off of using PHP?
Select an answer first
23foundation · easy
Which label stack operation adds a new label to the top of the label stack?
Select an answer first
24foundation · easy
What does an egress LSR do with the label stack before forwarding the packet based on the IP routing table?
Select an answer first
25expert · hard
A transit LSR receives an MPLS packet with label 150. The LFIB has two entries: one for label 150 with outgoing label 250 and next hop 192.0.2.2, and another for label 150 with outgoing label 260 and next hop 192.0.2.3. The router uses load balancing across equal-cost paths. What will the router do with the packet?
Select an answer first

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End-To-End Packet Flow and Forwarding JN0-364 Practice Questions (Page 5)

Questions 21–25

A packet travels through an MPLS network with four LSRs: ingress, transit1, transit2, and egress. The ingress pushes label 100. Transit1 swaps to 200. Transit2 swaps to 300. The egress pops the label. What is the label value on the packet when it arrives at transit2?

A service provider is designing an MPLS network and wants to minimize the processing load on the egress LSR. They are considering enabling PHP. Which statement correctly describes the trade-off of using PHP?

Which label stack operation adds a new label to the top of the label stack?

What does an egress LSR do with the label stack before forwarding the packet based on the IP routing table?

Keep studying — Multiprotocol Label Switching (MPLS)