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After DR and BDR are elected, neighbor routers form master-slave relationships in order to establish the method for exchanging link-state information.

a) Down
b) Init
c) 2-Way
d) Exstart
e) Exchange

User Feirell
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Final answer:

The stage during which routers establish master-slave relationships after DR and BDR are elected for exchanging link-state information is called the Exstart state in the OSPF protocol.

Step-by-step explanation:

After DR (Designated Router) and BDR (Backup Designated Router) are elected, neighbor routers form master-slave relationships in order to establish the method for exchanging link-state information. Among the given options (a) Down, (b) Init, (c) 2-Way, (d) Exstart, and (e) Exchange, the correct answer is (d) Exstart. This stage is essential in the OSPF (Open Shortest Path First) protocol as it precedes the state where link-state advertisement (LSA) exchange occurs. During the Exstart state, the routers establish a master-slave relationship and agree on the sequence numbers for the LSA headers, ensuring a synchronized exchange afterwards.

User Junsik
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