Which two statements about DMVPN with NHRP are true? (Choose two)

Question

Options

• ANHRP shortens the configuration of the hub router.
• BNHRP dynamically provides information about the spoke routers to the hub.
• CNHRP disables multicast
• DThe hub router uses NHRP to initiate the GRE tunnel with spokes.
• EThe spoke routers act as the NHRP servers.

• A
  89% (25)
• C
  4% (1)
• D
  7% (2)

Explanation

NHRP (Next Hop Resolution Protocol) is the control-plane mechanism that makes DMVPN function. Two true statements are: NHRP shortens hub router configuration (A) - because spokes dynamically register their physical (NBMA) IP addresses with the hub (which acts as the NHRP Server, or NHS), the hub does not need a static tunnel map entry for every spoke, greatly simplifying hub configuration. NHRP dynamically provides information about spoke routers to the hub (B) - spokes send NHRP Registration Requests to the hub upon connecting, so the hub always has a current mapping of spoke logical tunnel addresses to physical IP addresses. Option C is false - NHRP supports and enables multicast by maintaining a multicast mapping table. Option D is false - spokes initiate registration to the hub, not the other way around. Option E is false - the hub router serves as the NHRP Server (NHS); spokes are NHRP clients.

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