Which NTP type designates a router without an external reference clock as an authoritative time source?
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A. B. C. D.C
The correct answer to the question is A. server.
Explanation: NTP (Network Time Protocol) is a protocol used to synchronize the time on network devices. In an NTP configuration, there are different types of devices with different roles. The four types of NTP devices are:
Server: A server is an NTP device that provides time to other devices on the network. A server may have an external reference clock or synchronize with an upstream NTP server.
Peer: A peer is an NTP device that both provides time to and receives time from another NTP device. Peers have a symmetric relationship, and both devices are considered equally authoritative.
Master: A master is an NTP device that is the authoritative source of time for the network. It is typically synchronized with an external reference clock, such as a GPS receiver.
Client: A client is an NTP device that receives time from one or more servers or peers on the network.
In the given question, the router does not have an external reference clock. Therefore, it cannot be a master. A router that does not have an external reference clock and provides time to other devices on the network is considered a server. Hence, the correct answer to the question is A. server.