# 100-105 — Question 427

**Type:** multiple_choice
**Topics:** topic_1

## Question

Refer to the exhibit. When running OSPF, what would cause router A not to form an adjacency with router B?
//IMG//

## Correct Answer

_See scenario._

## Explanation

To form an adjacency (become neighbor), router A & B must have the same Hello interval, Dead interval and AREA numbers

**Reference:** examtopics_answer_description

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Source: https://hiexam.net/q/cisco/100-105/427  
Practice (tracked): https://hiexam.net/study/100-105/practice