Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) v1.2InfrastructureEasy
A network technician is configuring an NTP server on a Cisco router. The router needs to synchronize its clock with a reliable external time source. Which of the following commands correctly configures the router to act as an NTP client and synchronize with a server at 203.0.113.10?
- Antp master 203.0.113.10
- Bclock set 10:00:00 1 Jan 2024
- Cntp authenticate 203.0.113.10
- Dntp server 203.0.113.10
Show answer & explanationAnswer & explanation
Correct answer: D. ntp server 203.0.113.10
The `ntp server <IP_address>` command configures a Cisco device to act as an NTP client and synchronize its clock with the specified NTP server. This is the standard and correct way to point a device to a time source.
Why the other options are wrong
- A. `ntp master` configures the router to act as an authoritative NTP server itself, not a client.
- B. `clock set` manually sets the clock, which is not dynamic synchronization via NTP.
- C. `ntp authenticate` configures authentication for NTP, but does not specify the server itself.
NTP Client Configuration
The process of configuring a network device to synchronize its system clock with an external Network Time Protocol (NTP) server.
- Ensures accurate timekeeping across the network.
- Crucial for logging, security, and troubleshooting.
- Uses UDP port 123 for communication.
Memory trick: NTP Client: Just Point to the Server.