300-410 Question #26: Real Exam Question with Answer & Explanation

The correct answer is D: NHRP. DMVPN networks use NHRP to dynamically map logical tunnel IP addresses to physical NBMA IP addresses, facilitating direct spoke-to-spoke communication without traffic Hair-pinning through the hub.

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Question

Which protocol is used in a DMVPN network to map logical IP address to physical IP addresses?

Options

ABGP
BLLDP
CEIGRP
DNHRP

Explanation

DMVPN networks use NHRP to dynamically map logical tunnel IP addresses to physical NBMA IP addresses, facilitating direct spoke-to-spoke communication without traffic Hair-pinning through the hub.

Common mistakes.

A. BGP is a routing protocol for exchanging network reachability information between autonomous systems, not for mapping logical to physical IP addresses within a DMVPN overlay.
B. LLDP is a Layer 2 protocol used for discovering neighboring devices on a local segment and has no role in DMVPN IP address resolution.
C. EIGRP is an interior gateway routing protocol (IGRP) used for exchanging routing information within an autonomous system, not for the address resolution function of DMVPN.

Concept tested. DMVPN NHRP address resolution

Reference. https://www.cisco.com/c/en/us/td/docs/ios/sec_prot_suite/configuration/guide/ipsec_ig/ipsec_nhrp.html

Topics

#DMVPN#NHRP#VPN#Tunneling

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