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Juniper

JN0-363 · Question #43

You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the…

The correct answer is A. The router with the highest MAC address will be elected as the DIS. A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also…

IS-IS

Question

You are bringing a new network online with three IS-IS routers using default Junos election priorities. The routers are configured as Level 2 only IS-IS routers. Which statement is true about the DIS election in this scenario?

Options

  • AThe router with the highest MAC address will be elected as the DIS.
  • BThe router with the highest numerical lo0 IP address will be elected as the DIS.
  • CThe router with the lowest numerical lo0 IP address will be elected as the DIS.
  • DThe router with the lowest MAC address will be elected as the DIS.

How the community answered

(35 responses)
  • A
    86% (30)
  • B
    9% (3)
  • C
    3% (1)
  • D
    3% (1)

Explanation

A router's priority for becoming the designated router is indicated by an arbitrary number from 0 through 127, which you configure on the IS-IS interface. The router with the highest priority becomes the designated router for the area (Level 1, Level 2, or both), also configured on the IS- IS interface. If routers in the network have the same priority, then the router with the highest MAC address is elected as the designated router. By default, routers have a priority value of 64.

Topics

#IS-IS#DIS election#Level 2#MAC address tiebreaker

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