Drag and drop the MPLS terms from the left onto the correct definitions on the right.

Question

Explanation

This question tests knowledge of core MPLS (Multiprotocol Label Switching) terminology by requiring you to match each term to its precise definition. MPLS is a high-performance routing technique that directs data using short path labels rather than long IP addresses.

Approach. To answer correctly, map each term to its function in the MPLS forwarding plane: a Label is a short fixed-length identifier attached to packets at the network edge; an LSR (Label Switching Router) is a core router that forwards packets based solely on labels; an LER (Label Edge Router) sits at the network boundary and pushes (adds) or pops (removes) labels; an LSP (Label Switched Path) is the pre-determined end-to-end path packets follow through the MPLS domain; an FEC (Forwarding Equivalence Class) is the group of packets assigned the same label and forwarded identically; and LDP (Label Distribution Protocol) is the signaling protocol LSRs use to exchange and advertise label bindings. PHP (Penultimate Hop Popping) is also a common term - the second-to-last router removes the label before delivery to reduce egress router processing.

Concept tested. MPLS architecture and terminology - specifically the roles of LSR, LER, labels, LSPs, FECs, LDP, and PHP within a label-switched network

Reference. RFC 3031 (MPLS Architecture); CompTIA Network+ N10-009 / Cisco CCNA 200-301 - WAN Technologies and MPLS domain

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