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IntermediatePublished 2026-07-04

DNS Name Resolution on IOS

Bundle lab

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
Est. time
35 minutes
Difficulty
Intermediate
Topics

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

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How this lab is graded
  • Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with access-class, are stated in the guide and do have to match.
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