DNS Name Resolution on IOS

Bundle lab · $29.99

Enable and verify DNS-based name resolution on Cisco IOS. R1 will use a central DNS resolver on the management LAN and also maintain a static host mapping for R2, demonstrating resolution order and operational differences between local host tables and DNS queries.

Track

CCNA

Est. time

35 minutes

Difficulty

Intermediate

Topics

CCNA, DNS, Cisco IOS, Management Plane, Name Resolution

Learning objectives

Enable IOS DNS lookups globally with ip domain-lookup
Configure a DNS resolver with ip name-server 10.0.0.100
Create a local static name-to-address mapping with ip host
Explain and observe resolution order: static host table before DNS
Verify name resolution using show hosts and by pinging a hostname

Troubleshooting focus

Identify when no ip domain-lookup disables name resolution and re-enable it
Validate the correct DNS server IP and basic reachability to it
Use show hosts to confirm static vs cached/DNS-learned entries
Differentiate connectivity failures from name resolution failures

Topology

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What's included in the package

Work / baseline CML import — lab-work.yaml
Topology diagram — topology.svg
Print-ready topology diagram (PDF) — topology.pdf
Step-by-step learner guide (Markdown — for Obsidian/VS Code) — lab-guide.md
Branded PDF lab guide — open in any viewer (Adobe/Preview) — lab-guide.pdf
Getting-started README — README.md
Verification checklist — verification-checklist.md

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DNS Name Resolution on IOS

Learning objectives

Troubleshooting focus

Topology

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