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Exam 300-101 topic 1 question 43 discussion

Actual exam question from Cisco's 300-101
Question #: 43
Topic #: 1
[All 300-101 Questions]

Refer to the following output:

Router#show ip nhrp detail -
10.1.1.2/8 via 10.2.1.2, Tunnel1 created 00:00:12, expire 01:59:47
TypE. Dynamic, Flags: authoritative unique nat registered used

NBMA address: 10.12.1.2 -

What does the authoritative flag mean in regards to the NHRP information?

  • A. It was obtained directly from the next-hop server.
  • B. Data packets are process switches for this mapping entry.
  • C. NHRP mapping is for networks that are local to this router.
  • D. The mapping entry was created in response to an NHRP registration request.
  • E. The NHRP mapping entry cannot be overwritten.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
Show NHRP: Examples -
The following is sample output from the show ip nhrp command:

Router# show ip nhrp -
10.0.0.2 255.255.255.255, tunnel 100 created 0:00:43 expire 1:59:16
Type: dynamic Flags: authoritative
NBMA address: 10.1111.1111.1111.1111.1111.1111.1111.1111.1111.11
10.0.0.1 255.255.255.255, Tunnel0 created 0:10:03 expire 1:49:56
Type: static Flags: authoritative

NBMA address: 10.1.1.2 -
The fields in the sample display are as follows:
✑ The IP address and its network mask in the IP-to-NBMA address cache. The mask is always 255.255.255.255 because Cisco does not support aggregation of
NBMA information through NHRP.
✑ The interface type and number and how long ago it was created (hours:minutes:seconds).
✑ The time in which the positive and negative authoritative NBMA address will expire (hours:minutes:seconds). This value is based on the ip nhrp holdtime command.
✑ Type of interface:
"" dynamic "" NBMA address was obtained from the NHRP Request packet. "" static "" NBMA address was statically configured.
✑ Flags:
"" authoritative "" Indicates that the NHRP information was obtained from the Next Hop Server or router that maintains the NBMA-to-IP address mapping for a particular destination.
Reference:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nhrp/configuration/xe-16/nhrp-xe-16-book/config-nhrp.html
by shree at June 13, 2019, 9:59 p.m.

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shree
5 years, 6 months ago
Correct Answer: A
upvoted 2 times
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