JN0-351 · Question #57
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
The correct answer is A. MTU is not at least 1492 bytes. D. The lo0 interface is not included as an IS-IS interface. Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established. Option D suggests that the lo0 interface is not…
Question
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
Options
- AMTU is not at least 1492 bytes.
- BIP subnets are not a /30 address.
- CThe Level 2 routers have mismatched areas.
- DThe lo0 interface is not included as an IS-IS interface.
How the community answered
(24 responses)- A83% (20)
- B13% (3)
- C4% (1)
Explanation
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established. Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established.
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