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Ip dns server

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

ip dns server is a Cisco IOS global configuration command that configures the device to answer DNS queries.

ip dns server configures a Cisco IOS router to answer DNS queries from network hosts. The router can cache responses and forward unresolved queries to servers configured with ip name-server. section 3.2.2

Configure and verify the service with related IOS commands:

  • Enable server behavior with ip dns server; configure an upstream resolver with ip name-server 8.8.8.8. section 3.2.2 section 3.3
  • Use ip domain name jeremysitlab.com to supply a default domain, and ip host name ip-address for permanent local mappings. section 3.2.2

LAN clients resolve youtube.com through R1

PC1 queries R1. If R1 lacks the answer, it queries 8.8.8.8, caches the response, and replies to PC1; later clients can receive the cached mapping. section 3.2.2

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Explains configuration, recursive forwarding, caching, local mappings, and show hosts verification without detailing DNS-server internals.
Examples
Uses PC1, R1, youtube.com, 8.8.8.8, local host mappings, show hosts, and ping pc2.
What it assumes
Assumes basic DNS client-server behavior and introduces the router’s roles as DNS client, server, forwarder, and cache.
What you can do after
Operate/configure Cisco IOS DNS service and verify learned or manually configured mappings with show hosts.
How it connects
Ties DNS serving to DNS clients, recursive queries, caching, ip name-server, ip domain name, and ip host.
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