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Exam JN0-664 topic 1 question 51 discussion

Actual exam question from Juniper's JN0-664
Question #: 51
Topic #: 1
[All JN0-664 Questions]

In IS-IS. which two statements are correct about the designated intermediate system (DIS) on a multi-access network segment? (Choose two.)

  • A. On the multi-access network, each router forms an adjacency to every other router on the segment.
  • B. On the multi-access network, each router only forms an adjacency to the DIS.
  • C. A router with a priority of 1 wins the DIS election over a router with a priority of 10.
  • D. A router with a priority of 10 wins the DIS election over a router with a priority of 1.
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Suggested Answer: AD 🗳️
by hbstyleboy at May 7, 2024, 6:47 a.m.

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cdcogbuji
3 days, 21 hours ago
Selected Answer: BD
BD is correct answer
upvoted 1 times
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1a3c9cd
6 months, 1 week ago
Selected Answer: BD
It's B and D since like OSPF, IS-IS is also optimised to ensure no full-mesh neighborship is required.
upvoted 1 times
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quraitulain
8 months, 3 weeks ago
Its B and D DR (Designated Router) – On multi-access segments, OSPF routers elect a DR and a BDR, and all other routers on the segment create adjacencies with the DR and the BDR. DR election is based on a router's OSPF Priority, which is a configurable value from 0 (not eligible for DR) to 255.
upvoted 2 times
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piipo
11 months, 3 weeks ago
Selected Answer: AD
Correct
upvoted 2 times
crramos
9 months, 3 weeks ago
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html
upvoted 1 times
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Tony87
1 year ago
B,D are correct
upvoted 1 times
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hbstyleboy
1 year, 2 months ago
In IS-IS, all routers establish a full neighbor adjacency with each other (unlike OSPF where routers only form a full neighbor adjacency with the DR/BDR).
upvoted 4 times
Jentti
3 months ago
Above we have four routers connected to a LAN segment. These routers will send hello packets to each other and when they see other routers, they will become neighbors. In IS-IS, all routers establish a full neighbor adjacency with each other (unlike OSPF where routers only form a full neighbor adjacency with the DR/BDR). Once the routers are neighbors, they will flood their LSP to a multicast destination; all other routers will receive this LSP and add it to their database. Above we see that R1 floods its LSP on the LAN.
upvoted 2 times
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C (25%)
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