Cisco CCNA (200-301)IP ServicesEasy
A network administrator is troubleshooting an issue where several internal hosts are failing to register their DNS records automatically. The DHCP server is a Cisco IOS router. Which command should the administrator use to verify if the router is configured to update DNS records on behalf of its clients?
- Ashow ip dhcp database
- Bshow ip dhcp conflict
- Cshow ip dhcp binding
- Dshow ip dhcp pool
Show answer & explanationAnswer & explanation
Correct answer: D. show ip dhcp pool
The 'show ip dhcp pool' command displays detailed information about DHCP pools, including the configuration for DNS update behavior. This command will show if the 'dns-update' option is enabled.
Why the other options are wrong
- A. This command shows information about the DHCP database agent, not the pool configuration itself.
- B. This command shows IP address conflicts detected by the DHCP server, not DNS update settings.
- C. This command displays the current IP address leases assigned by the DHCP server to clients.
DHCP DNS Update Verification
To verify if a Cisco IOS DHCP server is configured to perform DNS updates for clients, use the 'show ip dhcp pool' command.
- DHCP servers can dynamically update DNS records for clients.
- This feature helps ensure DNS consistency for dynamically assigned IPs.
- The 'show ip dhcp pool' command reveals the 'dns-update' configuration.
Memory trick: DHCP Pool shows if DNS is a Go!