Cisco Certified Network Associate (CCNA) 200-301 — Question 353

The correct answer is B. Option B: R1(config)#interface ethernet0/0.20 R1(config-if)#encapsulation dot1q 20 R1(config-if)#ip address 10.20.20.1 255.255.255.0

Explanation

OSPF elects a designated router on multiaccess networks to reduce adjacency and LSA exchange overhead.