350-701 · Question #604
An engineer is adding a Cisco router to an existing environment. NTP authentication is configured on all devices in the environment with the command ntp authentication-key 1 md5 Cisc433392759. There…
The correct answer is B. ntp server 192.168.1.110 key 1 prefer. To configure the new router to use 192.168.1.110 as its preferred NTP time source with authentication, without becoming an NTP server itself, the ntp server command with the key and prefer options is required.
Question
An engineer is adding a Cisco router to an existing environment. NTP authentication is configured on all devices in the environment with the command ntp authentication-key 1 md5 Cisc433392759. There are two routers on the network that are configured as NTP servers for redundancy, 192.168.1.110 and 192.168.1.111. 192.168.1.110 is configured as the authoritative time source. What command must be configured on the new router to use 192.168.1.110 as its primary time source without the new router attempting to offer time to existing devices?
Options
- Antp server 192.168.1.110 primary key 1
- Bntp server 192.168.1.110 key 1 prefer
- Cntp peer 192.168.1.110 prefer key 1
- Dntp peer 192.168.1.110 key 1 primary
How the community answered
(51 responses)- A2% (1)
- B82% (42)
- C12% (6)
- D4% (2)
Why each option
To configure the new router to use 192.168.1.110 as its preferred NTP time source with authentication, without becoming an NTP server itself, the `ntp server` command with the `key` and `prefer` options is required.
The `primary` keyword is not a valid option for the `ntp server` command to designate a preferred server; the correct keyword is `prefer`.
The `ntp server` command configures the local device to act as an NTP client, synchronizing its clock with the specified server without offering its own time. The `key 1` option applies the configured authentication key, and `prefer` designates 192.168.1.110 as the primary or preferred time source among multiple configured servers.
The `ntp peer` command configures the device to both send and receive NTP packets, meaning it could potentially offer time to other devices, which contradicts the requirement of not offering time.
The `ntp peer` command would allow the new router to offer time, and `primary` is not the correct keyword for preferring a server, `prefer` is.
Concept tested: NTP client configuration with authentication and preference
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/ipapp-cr-book/ipapp-n1.html#wp4601837851
Topics
Community Discussion
No community discussion yet for this question.