Which protocol is proprietary to Cisco and enables multiple paths in the network while preventing network loops?

Question

Options

• AInternal Message Access Protocol
• BResiliency Ethernet Protocol
• CEthernet Multi-Stream Protocol
• DNetwork Loop Prevention Protocol

• A
  8% (3)
• B
  86% (32)
• C
  3% (1)
• D
  3% (1)

Explanation

Resilient Ethernet Protocol (REP) is Cisco's proprietary Layer 2 protocol designed for ring topologies - it blocks one port in the ring to prevent loops, then rapidly unblocks it if an active link fails, enabling fast convergence with multiple physical paths available.

Why the distractors are wrong:

• A. Internal Message Access Protocol - "IMAP" is an email retrieval protocol (Internet Message Access Protocol) and has no relation to network loop prevention.
• C. Ethernet Multi-Stream Protocol - This is a fabricated name; no such standard protocol exists.
• D. Network Loop Prevention Protocol - Also fabricated; generic-sounding names like this are a common distractor technique on Cisco exams.

Memory tip: Think REP = Ring protection. REP operates on ring-topology segments, and "resilient" signals its ability to survive link failures - if you see "Cisco + ring + loop prevention," reach for REP.

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