Nokia 4A0-113 Question Answer
An OSPF adjacency is stuck in the ExStart state. What is the most likely cause?
The MTU does not match on both interfaces.
OSPF is not enabled on one of the routers.
The router ID is the same on both routers.
An OSPF Hello has not been received from the neighbor.
The interfaces are configured as point-to-point on one side and broadcast on the other.
Comprehensive and Detailed Explanation From Exact Extract (Nokia 7750 SR OS Routing Protocols Guide — OSPF Neighbor State Machine):
In ExStart state, routers negotiate master/slave roles for DBD exchange.
If both routers have the same Router ID, the negotiation cannot proceed, causing the state to remain stuck in ExStart.
Thus, correct answer: C.
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TESTED 02 Jan 2026
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