The cloud, as an ISP network, is running on the MPLS (multi-protocol label switching) technology.

-Which router(s) need(s) to be MPLS technology-enabled to fast track the packets between the two hosts?
A) All routers
B) R1 and R6 only
C) R2 and R5 only
D) R3 and R4 only
E) R2, R3, R4, and R5 only

Question

The cloud, as an ISP network, is running on the MPLS (multi-protocol label switching) technology.
 
-Which router(s) need(s) to be MPLS technology-enabled to fast track the packets between the two hosts?
A) All routers 
B) R1 and R6 only 
C) R2 and R5 only 
D) R3 and R4 only 
E) R2, R3, R4, and R5 only

Quizplus · Accepted Answer

For MPLS (Multiprotocol Label Switching) to fast track packets between two hosts, all intermediate routers along the path need to be MPLS-enabled. This allows for the creation of a label-switched path (LSP) from the ingress router to the egress router. R1 and R6 act as the ingress and egress routers, respectively, and do not necessarily need to be MPLS-enabled themselves, as their primary role is to add or remove the MPLS labels. However, R2, R3, R4, and R5, being the intermediate routers, must support MPLS to ensure the packets are efficiently routed based on labels.

The Cloud, as an ISP Network, Is Running on the MPLS