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- CCNA Routing and Switching 200-125
81.
Which command will allow you to view the time drift observed by NTP?
- A.Router#show ntp
- B.Router#show ip ntp status
- C.Router#show ntp status
- D.Router#debug ntp drift
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The command show ntp status will allow you to see the current time source, the precision of the time source, and the drift from your internal time clock. |
82.
Which is a best practice for setting up NTP?
- A.Always configure the time source to a DNS address.
- B.Configure all devices to a public NTP server.
- C.Configure all devices to different NTP servers for redundancy.
- D.Configure all devices as master servers.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| A best practice is to configure the main router in your network to a known good trusted time source by its DNS address. All devices in your network should then be configured to point to this trusted router. All time sources should pyramid out from the central source of time in your network. |
83.
Which command will help you diagnose if the router or switch is getting an
answer back from an NTP server?
- A.Router#show ntp
- B.Router#show ip ntp
- C.Router#debug ntp packets
- D.Router#debug ntp messages
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The command debug ntp packets will allow you to verify packets received from an NTP server. |
84.
Which protocol and port does NTP use for time synchronization?
- A.TCP/161
- B.TCP/123
- C.UDP/69
- D.UDP/123
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| The Network Time Protocol uses UDP port 123 for time synchronization. |
85.
Which command will allow you to view the time details from a configured server?
- A.Router#show clock detail
- B.Router#show ntp detail
- C.Router#show ntp associations detail
- D.Router#show ntp skew
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The command show ntp associations detail will allow you to view the NTP clock details from the master NTP server. |
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