B or D. It cannot be determined whether R1 is in a client mode, because the stratum of the external NTP server is not given. If it's greater than 7, R1 will not use them. In this case, R1will be working in server mode, not client mode.
D is correct. To be a NTP client you must first specify the IP address of the NTP server. R1,R2, & R3 all use the ntp server command, which means these are clients.
Configuring NTP in Client Mode:
Step 1 - Specify the IP address of the NTP server.
*set ntp server ip_addr
Step 2 - Enable NTP client mode.
*set ntp client enable
Step 3 - Verify the NTP configuration.
*show ntp [noalias]
Ref: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/ntp.html#wp1019984
Answer correct is "D". The R3 has the config "NTP master 6" configured with stratum 6, and the R1 "NTP master 7" (stratum 7 "greater than 6"), however the stratum that is taken into account in R3 would be that of the remote source captured by the R1 as a client of the ip 209.165.200.225, and not its ntp master 7 configuration, and normally these clock sources are reliable with stratum 1 (NIST), which would result in a stratum 2 for R1 and stratum 3 for R3. Just in case R1 loses access to this remote clock source, its config "ntp master 7" with stratum 7 would be triggered, and it would send a stratum 8 to R3, then R3 with config "ntp master 6" would be triggered for having a smaller stratum, making it its own server. But in this case R3 is a client, synchronized with a remote clock from R1 and with a supposed stratum 3 (NIST stratum 1 - R1 stratum 2 - R3 stratum 3).
But in this case R3 is a client, synchronized with a remote clock from R1 and with a supposed stratum 3 (NIST stratum 1 - R1 stratum 2 - R3 stratum 3).
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