Issue a show interface serial 0/0 command, or the relevant interface number, to display the IP address, interface status, and the encapsulation type, as illustrated in the output below:
RouterA#show interface Serial0/0
Serial0 is up, line protocol is up
Hardware is HD64570
Internet address is 192.168.1.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
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