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Exam JN0-664 topic 1 question 86 discussion

Actual exam question from Juniper's JN0-664
Question #: 86
Topic #: 1
[All JN0-664 Questions]

Click the Exhibit button.



The network shown in the exhibit is based on IS-IS.

Which statement is correct in this scenario?

  • A. The routers are using unnumbered interfaces.
  • B. The system ID of R1_2 is 192.168.16.1.
  • C. The NSEL byte for Area 0001 is 00.
  • D. The area address is two bytes.
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by fukJUNIPER at April 21, 2024, 11:55 a.m.

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magmartin
1 week, 3 days ago
Selected Answer: D
From https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/is-is-routing-overview.html : NETs take several forms, depending on your network requirements. NET addresses are hexadecimal and range from 8 octets to 20 octets in length. Generally, the format consists of an authority and format Identifier (AFI), a domain ID, an area ID, a system identifier, and a selector. The simplest format omits the domain ID and is 10 octets long. For example, the NET address 49.0001.1921.6800.1001.00 consists of the following parts: 49—AFI 0001—Area ID <--- Digits are hex so 2 bytes long 1921.6800.1001—System identifier 00—Selector
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pxlx
2 weeks ago
Selected Answer: D
The NSEL is for an IS, not for an area.
upvoted 2 times
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ak_sisko
11 months, 2 weeks ago
B, NSEL byte not for area
upvoted 1 times
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fukJUNIPER
1 year, 3 months ago
Selected Answer: C
NSEL = short hand for N-Selector, which is the last 00, and this is standard for all ISIS NET addresses. And it is a byte long.
upvoted 3 times
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fukJUNIPER
1 year, 3 months ago
Area for this is 0001, so it's NOT 00. Area is 2 bytes long.
upvoted 2 times
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