Match each OSPFv2 network type or interface state on the left with its correct DR/BDR election requirement and default timer characteristics on the right.
- Broadcast Multiaccess interface with default interface settingsElects a DR and BDR; default Hello and Dead timers are 10s and 40s
- Point-to-Point interface over a serial link running HDLCDoes not elect a DR/BDR; default Hello and Dead timers are 10s and 40s
- Ethernet interface configured with the command `ip ospf priority 0`Ineligible for DR/BDR election (remains DROTHER); Hello/Dead timers remain 10s and 40s
- Point-to-Multipoint interface environmentDoes not elect a DR/BDR; default Hello and Dead timers are 30s and 120s
Answer
Broadcast Multiaccess maps to electing DR/BDR with 10s/40s timers; Point-to-Point maps to no DR/BDR with 10s/40s timers; Interface priority 0 maps to election ineligibility (DROTHER); Point-to-Multipoint maps to no DR/BDR with 30s/120s timers.
Each OSPF interface network type specifies whether DR/BDR elections are held and sets default Hello/Dead timers. Broadcast Ethernet networks elect DR/BDR with 10s/40s timers. Point-to-Point links bypass DR/BDR elections with 10s/40s timers. Setting priority to 0 on a broadcast interface retains standard timers but prevents DR/BDR election. Point-to-Multipoint skips DR/BDR elections and uses 30s/120s default timers.
Step-by-Step Solution
Key Concept
OSPFv2 DR/BDR election rules and default timer intervals vary according to the interface network type and priority setting.