What OSPF command, when configured, will include all interfaces into area 0?

The correct answer is A. network 0.0.0.0 255.255.255.255 area 0. This OSPF command configures the router to advertise all interfaces, regardless of their specific IP addresses, into OSPF area 0.

Submitted by lukas.cz· Mar 5, 2026IP Connectivity

Question

What OSPF command, when configured, will include all interfaces into area 0?

Options

Anetwork 0.0.0.0 255.255.255.255 area 0
Bnetwork 0.0.0.0 0.0.0.0 area 0
Cnetwork 255.255.255.255 0.0.0.0 area 0
Dnetwork all-interfaces area 0

How the community answered

(21 responses)

A
95% (20)
C
5% (1)

Why each option

This OSPF command configures the router to advertise all interfaces, regardless of their specific IP addresses, into OSPF area 0.

Anetwork 0.0.0.0 255.255.255.255 area 0Correct

The `network 0.0.0.0 255.255.255.255 area 0` command uses a wildcard mask of 255.255.255.255, which effectively matches all IP addresses on all interfaces. This configuration instructs OSPF to enable the protocol on every interface that has an IP address, assigning them all to OSPF Area 0.

Bnetwork 0.0.0.0 0.0.0.0 area 0

Cnetwork 255.255.255.255 0.0.0.0 area 0

Dnetwork all-interfaces area 0

Concept tested: OSPF network command wildcard mask

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

Topics

#OSPF configuration#OSPF network command#OSPF area 0#Routing protocols

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