JN0-364: Service Provider Routing and Switching, Specialist (JNCIS-SP)Demo

By Juniper · Question Mode

QuestionQ36

Intermediate System to Intermediate System (IS-IS)

Refer to the exhibit.

Question Image

R1 and R2 are configured to run IS-IS, and the IS-IS adjacency between R1 and R2 is up.

What does the show isis interface command output indicate about R1?

  • A R1 advertises a Level 1 metric of 100 and a Level 2 metric of 100 toward R2 in its link-state PDU
  • B R1 only forms a Level 2 adjacency with R2.
  • C R1 sends Level 1 hello PDUs to R2.
  • D R1 is not configured to use wide metrics.
Explanation

A Disabled value in the Level 1 DR field indicates that Level 1 is disabled on the interface, while Point to Point in the Level 2 DR field indicates an active Level 2 point-to-point interface. Therefore, an up adjacency on this link is Level 2 only. Juniper’s IS-IS verification examples show the same Disabled Level 1 and Point to Point Level 2 output for Level 2 interfaces.

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