200-301: Cisco Certified Network AssociateDemo

Question

OSPF must be configured between routers R1 and R2. Which OSPF configuration must be applied to router R1 to avoid a DR/BDR election?

A router ospf 1 network 192.168.1.1 0.0.0.0 area 0 interface e1/1 ip address 192.168.1.1 255.255.255.252 ip ospf cost 0
B router ospf 1 network 192.168.1.1 0.0.0.0 area 0 hello interval 15 interface e1/1 ip address 192.168.1.1 255.255.255.252
C router ospf 1 network 192.168.1.1 0.0.0.0 area 0 interface e1/1 ip address 192.168.1.1 255.255.255.252 ip ospf network broadcast
D router ospf 1 network 192.168.1.1 0.0.0.0 area 0 interface e1/1 ip address 192.168.1.1 255.255.255.252 ip ospf network point-to-point

Explanation

A DR/BDR election is avoided by using an OSPF network type that does not elect a designated router, such as point-to-point. On an Ethernet interface, configuring ip ospf network point-to-point makes the adjacency operate as a point-to-point OSPF link, so no DR or BDR is elected. Broadcast network type still performs a DR/BDR election, and changing the hello interval or interface cost does not affect whether that election occurs.

Learn more

Initial Configurations for OSPF over a Point-to-Point Link (Cisco)

200-301: Cisco Certified Network AssociateDemo

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Notes

Readiness

QuestionQ1207

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