A network engineer wants to synchronize the time of a router with an NTP server at the IPv4 address 209.165.200.225. The exit interface of the router is configured with an IPv4 address of 192.168.212.11. Which global configuration command should be used to configure the NTP server as the time source for this router?

Question

A network engineer wants to synchronize the time of a router with an NTP server at the IPv4 address 209.165.200.225. The exit interface of the router is configured with an IPv4 address of 192.168.212.11. Which global configuration command should be used to configure the NTP server as the time source for this router?

BlackTom AI · Accepted Answer

Use "ntp server 209.165.200.225" as the global configuration command to point the router to that NTP time source.

1) Relevant knowledge points and concepts
- Cisco IOS NTP configuration: the global command format to configure a remote time source is "ntp server <ip-address>" (entered in global configuration mode).
- "ntp peer" creates a symmetric peer association and is used when both devices are configured to act as peers (mutual time sources), not when you simply want the router to use a remote server.
- The router’s exit-interface IP (192.168.212.11) is its local address; it is not the NTP server address unless the local device itself is the server. You must configure the actual NTP server’s IP (209.165.200.225).

2) Step-by-step reasoning
- The requirement: synchronize router time with the NTP server at 209.165.200.225.
- Enter global configuration mode, then issue the appropriate NTP command that points to that server IP.
- The correct command syntax is: Router(config)# ntp server 209.165.200.225

3) Intermediate steps / verification
- (optional) After configuring, verify with "show ntp associations" and "show ntp status" and ensure reachability (ping 209.165.200.225) and proper routing out the interface with IP 192.168.212.11. These checks confirm association, but they do not change the configuration command itself.

4) Why the correct answer is correct
- "ntp server 209.165.200.225" explicitly designates the remote host as the NTP time source using the standard client/server association type for Cisco routers.

5) Why the other options are incorrect
- "ntp peer 209.165.200.225": uses a peer (symmetric) association, inappropriate when the router should simply use a server.
- "ntp server 192.168.212.11": points to the router’s own exit-interface IP (local address), not the remote NTP server, so it would not reach the intended server.
- "ntp peer 192.168.212.11": both the wrong command type (peer) and the wrong IP (local interface), so incorrect.

Conclusion: The correct global configuration command is "ntp server 209.165.200.225", which matches the provided answer.

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