Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)
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A. B. C. D.BD
MPLS (Multiprotocol Label Switching) is a mechanism that is used to forward traffic through a network by using labels instead of traditional IP addresses. LSPs (Label-Switched Paths) are used in MPLS to define a path between two routers that forward packets based on the labels assigned to the packets. Here are the explanations for the two statements that are true about MPLS LSPs:
B. LSPs are unidirectional: LSPs are unidirectional paths that are established between two routers in a network. They are used to forward traffic in one direction only, from the source router to the destination router. This means that if two routers need to communicate bidirectionally, two LSPs need to be established between them, one for each direction.
D. LSPs can follow paths other than the IGP's shortest path: LSPs are not required to follow the IGP's (Interior Gateway Protocol) shortest path in a network. In fact, they can be configured to follow any path that the network administrator chooses. This flexibility allows network administrators to optimize the network for specific applications or traffic flows, by selecting the best path for each LSP.
A. LSPs are bidirectional: This statement is incorrect. LSPs are unidirectional, as explained above.
C. LSPs must follow the IGP's shortest path: This statement is also incorrect, as explained above. LSPs can be configured to follow any path, not just the IGP's shortest path.