300-320 Question #490: Real Exam Question with Answer & Explanation

The correct answer is B: NHRP. NHRP (Next Hop Resolution Protocol) is the core protocol that enables dynamic spoke-to-spoke communication in DMVPN. When a spoke needs to reach another spoke, it sends an NHRP resolution request to the hub (which acts as the NHRP server). The hub responds with the public IP addr

Question

A network manager wants all remote sites to be designed to communicate dynamically with each other using DMVPN technology without requiring much configuration on the spoke routers. DMVPN uses which protocol to achieve this goal?

Options

AGRE
BNHRP
CSSH
DARP

Explanation

NHRP (Next Hop Resolution Protocol) is the core protocol that enables dynamic spoke-to-spoke communication in DMVPN. When a spoke needs to reach another spoke, it sends an NHRP resolution request to the hub (which acts as the NHRP server). The hub responds with the public IP address of the destination spoke, allowing the initiating spoke to build a direct dynamic tunnel without any pre-configuration. GRE is the tunneling encapsulation protocol used in DMVPN, but GRE alone is static and does not provide dynamic neighbor discovery. SSH is a management protocol, and ARP is a Layer 2 resolution protocol - neither plays a role in DMVPN dynamic tunnel establishment.

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