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Question 1 of 3

How big is an MPLS label header?

16 bits32 bits (20 bit label + 3 EXP + 1 S + 8 TTL)64 bitsVaries

Question 2 of 3

What does PHP (Penultimate Hop Popping) do?

The first hop pops the labelThe router immediately before the egress LER pops the outer label so the egress only needs an IP lookupPHP rewrites the IP destinationAdds an additional label for redundancy

Question 3 of 3

Which protocol is used to ESTABLISH MPLS LSPs that follow the IGP's shortest path?

OSPFLDPBGPRSVP-TE

MPLS — labels, FEC, and the LSP lifecycle — Quiz