350-401 Question #222: Real Exam Question with Answer & Explanation

The correct answer is A: network 20.1.1.2.0.0.0.0 area 0. To form an OSPF neighborship on R2, the network command must be applied to include the interface's specific IP address (20.1.1.2) within Area 0, using a host wildcard mask.

Submitted by lars.no· Mar 6, 2026

Question

Refer to the exhibit. Which command must be applied to R2 for an OSPF neighborship to form?

Options

Anetwork 20.1.1.2.0.0.0.0 area 0
Bnetwork 20.1.1.2 255.255.0.0. area 0
Cnetwork 20.1.1.2 0.0.255.255 area 0
Dnetwork 20.1.1.2 255.255.255 area 0

Explanation

To form an OSPF neighborship on R2, the network command must be applied to include the interface's specific IP address (20.1.1.2) within Area 0, using a host wildcard mask.

Common mistakes.

B. The wildcard mask 255.255.0.0 is incorrect for an OSPF network command; it's a subnet mask and not a valid wildcard mask in this context.
C. The wildcard mask 0.0.255.255 is incorrect as it implies a /16 network, which would not match a typical /24 interface subnet, and is not the inverse of a /24 subnet mask.
D. The wildcard mask 255.255.255 is incomplete; a valid wildcard mask requires four octets, like 0.0.0.0 or 0.0.0.255.

Concept tested. OSPF network command configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-s/iro-15-s-book/config-ospf.html

Topics

#OSPF network command#OSPF neighborship#Wildcard masks#Cisco IOS routing

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