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4.0 Network Services and Security

DNS Practice Questions

Updated for CCNA v2.0

Domain name resolution on Cisco IOS devices.

Author-reviewed by LabFabric · 6 September 2026 · Report a content issue

One solved question, so you can see how these are marked

Which command tells a router which DNS server to query when it needs to resolve a hostname to an IP address?

ip name-server 1.1.1.1

ip name-server specifies the DNS resolver addresses used by the router itself. It does not distribute DNS settings to client PCs; configure those separately, for example through DHCP.

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All 4 DNS questions in this set

Answers and explanations appear when you work through the set above.

  1. A router needs to resolve the name PC1 to 192.168.0.1 without relying on an external DNS server. Which command accomplishes this directly on the router?

    • ip name-server PC1 192.168.0.1
    • ip domain-name PC1 192.168.0.1
    • ip host PC1 192.168.0.1
    • ip dns static PC1 192.168.0.1

  2. Which command displays a router's configured DNS server, default domain, and any statically or dynamically learned hostname to address mappings?

    • show ip dns
    • show hosts
    • show ip host-table
    • show running-config | section dns

  3. On a router with ip name-server 1.1.1.1 and ip host PC1 192.168.0.1 both configured, an administrator runs ping PC1. What happens?

    • The router always queries the DNS server at 1.1.1.1 first because dynamic lookups take priority
    • The router uses the local static host entry for PC1 and pings 192.168.0.1 without querying the DNS server
    • The command fails because both a name server and a static host entry cannot exist at the same time
    • The router prompts the administrator to choose which mapping to use

  4. An end-user PC needs to resolve names like youtube.com to an IP address. Where is the DNS server address configured for that PC in a typical lab setup?

    • In the PC's IP configuration, as a DNS server address alongside its IP address, subnet mask, and default gateway
    • On the nearest switch, using the ip name-server command
    • In the router's ip domain-name command, which then pushes DNS settings to all PCs automatically
    • PCs cannot be configured with DNS servers, only routers can