JN0-360: Juniper Networks Certified Internet Specialist Exam

GE Interface

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Question

-- Exhibit --

[edit]

user@router# run show isis interface

IS-IS interface database:

Interface L CirID Level 1 DR Level 2 DR L1/L2 Metric ge-1/0/2.0 3 0x1 router.00 router.00 10/10 lo0.0 0 0x1 Passive Passive 0/0

-- Exhibit --

Click the Exhibit button.

Referring to the exhibit, which two statements are true regarding the GE interface? (Choose two.)

Answers

Explanations

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A. B. C. D.

AC

Based on the output of the command "show isis interface" shown in the exhibit, we can gather the following information about the two interfaces:

  1. Interface ge-1/0/2.0:

    • It is connected to the IS-IS network.
    • It is operating at Level 1 (L1) and Level 2 (L2).
    • It has a circuit ID (CirID) of 3.
    • The Level 1 Designated Router (DR) is router.00, and the Level 2 DR is also router.00.
    • The L1/L2 metric for this interface is 10/10.

  2. Interface lo0.0:

    • It is connected to the IS-IS network.
    • It is operating at Level 0 (L0), which is a special level used for the router's own addresses.
    • It is in passive mode, which means it does not participate in IS-IS routing updates.
    • It has a CirID of 0.

Based on this information, we can determine that:

A. It operates at both Level 1 and Level 2.

  • This statement is true. Interface ge-1/0/2.0 is operating at both Level 1 and Level 2, as indicated by the Level column in the output.

B. It operates at Level 3, which supports hierarchical backbone areas.

  • This statement is false. The output does not indicate that the GE interface is operating at Level 3, and there is no information provided that suggests the network is using hierarchical backbone areas.

C. The local router is the IS-IS designated intermediate system at all levels.

  • This statement is false. The output indicates that the local router is the DR at both Level 1 and Level 2, but it does not provide any information about designated intermediate systems (DIS).

D. The local router is the IS-IS designated router at all levels.

  • This statement is false. The output indicates that the local router is the DR at both Level 1 and Level 2, but it does not provide any information about designated routers (DR) at other levels, and it is not possible for a router to be the DR at all levels simultaneously.

Therefore, the correct answers are A. It operates at both Level 1 and Level 2, and C. The local router is the IS-IS designated intermediate system at all levels.

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