A network administrator configures interface G0/0 on R1 with the ip address 172.16.1.254 255.255.255.0 command. However, when the administrator issues the show ip route command, the routing table does not show the directly connected network. What is the possible cause of the problem?
- Interface G0/0 has not been activated.
- No packets with a destination network of 172.16.1.0 have been sent to R1.
- The configuration needs to be saved first.
- The subnet mask is incorrect for the IPv4 address.
Explanation: A directly connected network will be added to the routing table when these three conditions are met: (1) the interface is configured with a valid IP address; (2) it is activated with the no shutdown command; and (3) it receives a carrier signal from another device that is connected to the interface. An incorrect subnet mask for an IPv4 address will not prevent its appearance in the routing table, although the error may prevent successful communications.
Exam with this question: CCNA 2 v6 Chapter 1: Check Your Understanding
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