Cisco CCNA (200-301)Network FundamentalsEasy
A network administrator needs to determine the current operational status and configured IP address of a specific interface on a Cisco router. Which Cisco IOS command would provide this information concisely?
- Ashow ip interface brief
- Bshow interface GigabitEthernet0/1
- Cshow interfaces status
- Dshow running-config interface GigabitEthernet0/1
Show answer & explanationAnswer & explanation
Correct answer: A. show ip interface brief
The 'show ip interface brief' command provides a quick summary of all interfaces, including their IP addresses and their current operational and protocol status (up/down). This is the most concise way to get the requested information.
Why the other options are wrong
- B. 'show interface GigabitEthernet0/1' provides detailed statistics and status for a single interface, but 'brief' is more concise for a summary.
- C. 'show interfaces status' provides connection status for switch ports, not IP addressing for router interfaces.
- D. 'show running-config interface' shows only the configuration of a specific interface, not its operational status or dynamically assigned IP if using DHCP.
Cisco IOS Interface Summary
The 'show ip interface brief' command in Cisco IOS provides a quick summary of the IP address and status for all interfaces on a router or Layer 3 switch.
- Displays interface name, IP address, OK? (method), status, and protocol.
- Useful for quickly checking interface operational state and IP configuration.
- Does not show detailed interface statistics or errors.
Memory trick: Briefly IP your Interface, and see its Status.