DNS server
A DNS server is a network service that answers domain-name queries by returning corresponding DNS records or obtaining them from other DNS servers.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
A DNS server is a service that answers domain-name queries by returning corresponding network records or consulting other DNS servers.
- How it is used
- Supports hostname-based access by resolving names locally, forwarding queries, caching responses, and serving Cisco IOS clients.
- How deep it goes
- Explains cache behavior, recursive forwarding, IOS commands, defaults, verification, and manual mappings, but stops short of DNS server internals.
- Examples
- Uses browser resolution, google.com and youtube.com queries, Cisco IOS ping output, cached mappings, and manual PC1-to-PC2 hostname resolution.
- What you can do after
- Configure Cisco IOS as a DNS client or server, set upstream resolvers and mappings, and verify hostname resolution with show hosts and ping.
Read how Acing the CCNA Exam: Volume 2 Advanced Networking and Security explains DNS server →
Kubernetes in Action, Second Edition
A DNS server resolves domain names into network addresses and other DNS records.
- How it is used
- Resolves Kubernetes Service names so pods can connect without embedding cluster IP addresses in application configuration.
- How deep it goes
- Explains same- and cross-namespace names, DNS suffixes, and pod resolver configuration, but does not detail DNS server internals.
- Examples
- Uses quiz and quote Service URLs, kubectl output, and a pod’s /etc/resolv.conf to demonstrate name resolution.
- What you can do after
- Apply DNS through Kubernetes Service names and configure applications with stable internal URLs.
Read how Kubernetes in Action, Second Edition explains DNS server →
Related concepts
- ip dns serverconfigured by · ip dns server is a Cisco IOS global configuration command that configures the device to answer DNS queries.
- root dns serveruses · A root DNS server is a server at the top of the DNS hierarchy that directs queries to authoritative servers for top-level domains.
- recursive dns queryused by · A recursive DNS query requests that a DNS server return a definite answer or an error for the client rather than referring the client elsewhere.
- dns queryused by · A DNS query is a request sent to the Domain Name System to obtain information about a domain name or other DNS record.
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