That is just fantastic... The Q is about the mode, not a command. So, server is the mode while you need to use master command to enable it hence the answer is D.
Interesting as here are the options....note "master" is actually needed to answer the question!
SW4(config)#ntp server
% Incomplete command.
SW4(config)#ntp server ?
A.B.C.D IP address of peer
WORD Hostname of peer
X:X:X:X::X IPv6 address of peer
ip Use IP for DNS resolution
ipv6 Use IPv6 for DNS resolution
vrf VPN Routing/Forwarding Information
SW4(config)#ntp master
SW4(config)#do sh run | i version
version 15.2
hth
My logic says D is correct. If it's an authoritative server, it should be a server. "Peer" means the NTP server is getting its time from someone else and passing it along to clients (correct me if I'm wrong). If that's the case, it's not an "authoritative" time source, it's just passing the data along from a more authoritative source.
When using a Cisco router as an NTP (Network Time Protocol) authoritative server, you typically want to configure it in NTP Server mode. In NTP terminology, this is referred to as the "NTP Server" mode.
In this mode, the Cisco router will provide time synchronization information to other devices in your network, acting as a time source for them. Other devices can then synchronize their clocks with the Cisco router's clock. To configure a Cisco router as an NTP server, you would use commands like:
shell:
ntp server <server-ip-address>
I think these types of questions are planted in there just to mess with test takers.
"Master" is when you want a Cisco router to act as an authoritative NTP server.
"Server <ip-address-of-authoritative-server>" is when you want a Cisco router to act as an NTP client and sync from an authoritative NTP server.
System as an Authoritative NTP Server:
Use the ntp master command in global configuration mode if you want the system to be an authoritative NTP server, even if the system is not synchronized to an outside time source.
https://www.cisco.com/c/dam/en/us/td/docs/ios-xml/ios/bsm/configuration/xe-3se/3650/bsm-xe-3se-3650-book.html#:~:text=ntp%20server%20command.-,System%20as%20an%20Authoritative%20NTP%20Server,to%20an%20outside%20time%20source.&text=Use%20the%20ntp%20master%20command%20with%20caution.
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