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300-410 · Question #36

Refer to the following output: Router#show ip nhrp detail 1.1.1.1/8 via 10.1.1.2, Tunnel1 created 00:00:12, expire 01:59:47 Type: 2/dynamic, usage: authoritative unique nat registered used NBMA…

The correct answer is A. It was obtained directly from the next-hop server. In NHRP, the 'authoritative' flag indicates that the mapping entry was directly learned from the Next-Hop Server (NHS), confirming it as the primary and trusted source for that specific address resolution.

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Question

Refer to the following output: Router#show ip nhrp detail 1.1.1.1/8 via 10.1.1.2, Tunnel1 created 00:00:12, expire 01:59:47 Type: 2/dynamic, usage: authoritative unique nat registered used NBMA address: 10.1.2.1.2 What does the authoritative flag mean in regards to the NHRP information?

Exhibit

300-410 question #36 exhibit

Options

  • AIt was obtained directly from the next-hop server.
  • BData packets are process switches for this mapping entry.
  • CNHRP mapping is for network that are local to this router.
  • DThe mapping entry was created in response to an NHRP registration request.
  • EThe NHRP mapping entry cannot be overwritten.

How the community answered

(30 responses)
  • A
    90% (27)
  • B
    3% (1)
  • C
    7% (2)

Why each option

In NHRP, the 'authoritative' flag indicates that the mapping entry was directly learned from the Next-Hop Server (NHS), confirming it as the primary and trusted source for that specific address resolution.

AIt was obtained directly from the next-hop server.Correct

The 'authoritative' flag in NHRP output signifies that the mapping entry, which associates a logical IP address with a physical NBMA address, was learned directly from the Next-Hop Server (NHS). This indicates that the mapping is reliable and comes from the designated source responsible for providing that resolution information.

BData packets are process switches for this mapping entry.

Process switching refers to a CPU-intensive packet forwarding path and is unrelated to how an NHRP mapping's authority is determined.

CNHRP mapping is for network that are local to this router.

The authoritative flag indicates the source of the mapping, not whether the mapped network segment is directly connected or local to the router itself.

DThe mapping entry was created in response to an NHRP registration request.

While many NHRP entries result from registration requests, the 'authoritative' flag specifically denotes that the mapping was obtained from the trusted source (NHS), distinguishing it from possibly indirectly learned or temporary entries.

EThe NHRP mapping entry cannot be overwritten.

The authoritative flag indicates trustworthiness and direct sourcing, but NHRP mappings are dynamic and can be updated or overwritten if new authoritative information is received.

Concept tested: NHRP authoritative flag meaning

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_prot_suite/configuration/xe-16/sec-prot-suite-xe-16-book/sec-prot-suite-config-nhrp.html

Topics

#NHRP#DMVPN#CLI Interpretation#Next-Hop Resolution

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