Match each OSPFv2 network type configuration on the left with its corresponding DR/BDR election requirement and default Hello/Dead timer characteristics on the right.
- Broadcast (`ip ospf network broadcast`)Elects a DR/BDR automatically using multicast Hello packets; default Hello timer is 10 seconds and Dead timer is 40 seconds.
- Point-to-Point (`ip ospf network point-to-point`)Does not elect a DR/BDR; sends multicast Hello packets with default Hello timer of 10 seconds and Dead timer of 40 seconds.
- Point-to-Multipoint (`ip ospf network point-to-multipoint`)Does not elect a DR/BDR; sends multicast Hello packets to all neighbors with default Hello timer of 30 seconds and Dead timer of 120 seconds.
- Non-Broadcast (`ip ospf network non-broadcast`)Elects a DR/BDR but requires manual `neighbor` statements due to lack of multicast support; default Hello timer is 30 seconds and Dead timer is 120 seconds.
Answer
Broadcast pairs with DR/BDR elected automatically with 10s/40s timers. Point-to-Point pairs with no DR/BDR election and 10s/40s timers. Point-to-Multipoint pairs with no DR/BDR election and 30s/120s timers. Non-Broadcast pairs with DR/BDR elected using manual neighbor statements and 30s/120s timers.
Each OSPF network type has distinct rules regarding whether DR/BDR elections occur, whether multicast is used for neighbor discovery, and which default timers apply. LAN-oriented types (Broadcast and Point-to-Point) use 10-second Hello and 40-second Dead timers, while WAN-oriented types (Point-to-Multipoint and Non-Broadcast) use 30-second Hello and 120-second Dead timers. Multiaccess types (Broadcast and Non-Broadcast) perform DR/BDR elections, whereas point-to-point styles (Point-to-Point and Point-to-Multipoint) bypass DR/BDR elections entirely.
Step-by-Step Solution
Key Concept
OSPFv2 Network Types, DR/BDR Election Requirements, and Default Timers
Estimated Time:2m 0s