Q: 2
DRAG DROP Drag and drop the descriptions from the left onto the corresponding MPLS components on the right. 
Drag & Drop
Discussion
LSR to P routers, FEC to same label/path traffic, LER to PE routers, LDP is for label exchange, LSP is the path. Pretty sure that's correct but open to other mappings if anyone disagrees.
LSR → routers in the core, FEC → all traffic same path/label, LER → connects to PE routers, LDP → label exchange protocol, LSP → MPLS path. That’s the match here. Seen this format before.
Maps look like this: LSR is the core/P router, FEC is for grouping traffic with same path/label, LER sits at the edge (PE), LDP handles label mapping between routers, and LSP defines the path across MPLS. Pretty sure that's right but let me know if I missed something subtle.
I remember a similar scenario from labs, in the official guide and labs. Mapping is: LSR to core routers (P), FEC to same path/label, LER for PE edge, LDP for label exchange, LSP as the MPLS path. Pretty sure that's right but let me know if you spot anything off.
LSR to core routers, FEC for same path/label, LER to PE, LDP for label mapping, LSP is the path.
LSR → routers in the core (P routers), FEC → all traffic on same path/label, LER → routers connecting to customer (PE), LDP → exchanging label mapping info, LSP → path through MPLS. If the question had labeled a device as CE instead of PE, LER wouldn’t be the answer for that one. Came across this edge-case in another practice set.
Nah, I don't think the trap is with LSR or LER here-the real catch is confusing LSP (the path) with LDP (the protocol). So it's: LSR → core P routers, FEC → same label/path, LER → PE routers, LDP → label exchange, LSP → path. Anyone else see it different from actual exam reports?
LSR = core routers (P), FEC = all traffic same path/label, LER = PE routers, LDP = label mapping exchange, LSP = the MPLS path. I don’t think there’s any mixup, unless they call edge routers CE by mistake. Trap is mixing up LSP and LDP.
FEC → all traffic to be forwarded using the same path and same label, LSP → path along which traffic flows across MPLS network, LER → routers that connect to the customer routers (PE routers), LSR → routers in the core (P routers), LDP → used for exchanging label mapping. Saw a similar question on a practice exam. Could be mixed up with LER/LSR if not careful.
I don't think the only trap here is LSR or LER, seems like mixing up LSP and LDP catches people more. My mapping: LSR to P routers, FEC to same label/path traffic, LER to PE routers, LDP for label exchange, LSP as the actual path. Seen similar on exam reports.
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