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Exam JN0-348 topic 1 question 70 discussion

Actual exam question from Juniper's JN0-348
Question #: 70
Topic #: 1
[All JN0-348 Questions]

When electing a DIS in an IS-IS network, what is used to break a priority tie?

  • A. highest MAC address
  • B. highest router ID
  • C. lowest MAC address
  • D. lowest router ID
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Suggested Answer: A 🗳️
by boyseven777 at June 26, 2020, 8:37 a.m.

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pythongeeek
Highly Voted 4 years, 4 months ago
Unlike in OSPF, in ISIS, routers of the same level, in a network segment, set up adjacencies (including non-DIS routers). ... The highest priority means the router is elected as DIS. In case that all routers have the same DIS priority, the one with the highest MAC address is chosen as DIS.
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nickname98163
Most Recent 2 years, 9 months ago
Selected Answer: A
DIS election process looks for highest priority value, then highest SNPA(Subnetwork Point of Attachment) aka MAC address.
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boyseven777
4 years, 10 months ago
https://www.juniper.net/documentation/en_US/junos/topics/concept/routing-protocol-is-is-security-designated-router-understanding.html
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