WEBVTT

1
00:00:00.100 --> 00:00:07.100
A Linux server provides name and time services on two lab links.

2
00:00:18.300 --> 00:00:24.800
Add a DNS server and an address record in Server Builder.

3
00:00:31.650 --> 00:00:40.650
Add a local NTP server to the same design and apply it to the Linux server.

4
00:00:48.200 --> 00:00:55.700
Query the DNS server and check that the record returns the intended address.

5
00:00:56.700 --> 00:01:02.700
A lookup for an unknown name returns no matching record.

6
00:01:03.600 --> 00:01:11.100
Ping the address from the record to verify that the destination is reachable.

7
00:01:20.250 --> 00:01:27.750
Configure the Cisco router to use the Linux server as its NTP source.

8
00:01:29.900 --> 00:01:35.900
Check the selected association and confirm that the router synchronizes.

9
00:01:39.150 --> 00:01:44.650
Take down the router link to the time source.

10
00:01:45.650 --> 00:01:51.650
The router loses synchronization while the time source is unreachable.

11
00:01:55.800 --> 00:02:03.300
Restore the link and check that the router selects the time source again.

12
00:02:05.050 --> 00:02:11.050
Check the clock status to confirm that synchronization has returned.