Question

Two routers, R1 and R2, connect using an Ethernet over MPLS service The service provides point-to-point service between these two routers only, as Layer 2 Ethernet service. Which of the following are most likely to be true about this WAN? (choose two)a) R1 will connect to a physical Ethernet link, with the other end of the cable connected to R2.b) R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service provider point of presence.c) R1 will forward data link frames to R2 using an HDLC header/trailer.d) R1 will forward data link frames to R2 using an Ethernet header/trailer.

Answer 1

Answer: b) R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service provider point of presence.

.d) R1 will forward data link frames to R2 using an Ethernet header/trailer.

Explanation:

Here we have to understand what is MLPS. MLPS is a protocol which identifies the shortest route for the transfer of messages between routers instead of the longest route.

Here we are given a WAN which is a wide area network. Using layer 2 Ethernet service the frames are transmitted across the routers within the WAN.

Option A is incorrect as as connecting the other end of the cable to the R2 would reduce the functionality of the WAN.  Option C is incorrect as HDLC header trailer has no effect.

Option B and D are correct as Ethernet header/ trailer has the same size every frame and to maintain the functionality of the WAN one end must be connected to point of presence(PoP).