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1.0 Network Infrastructure and Connectivity

Interface Configuration Practice Questions

Speed/duplex, descriptions, and interface troubleshooting.

CCNA v2.0 objective 2.1.a · objective map

Author-reviewed by LabFabric · 7 September 2026 · Report a content issue

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

After assigning an IP address to a router interface with ip address 172.16.255.254 255.255.0.0, the interface still shows as administratively down. What additional command is needed to bring it up?

no shutdown

Administratively down means the interface is disabled in configuration. The no shutdown command removes that administrative shutdown; the interface will reach an up state only if the physical and data-link conditions are also satisfied.

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Find related practice in the CCNA path
All 7 Interface Configuration questions in this set

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

  1. On an IOS switch interface that supports manually setting these values, which command pair requests 1000 Mbps and full duplex?

    • speed 1000 and duplex full
    • bandwidth 1000 and duplex auto
    • speed auto and duplex full
    • mtu 1000 and duplex full

  2. Which command lets an administrator apply the same configuration, such as description or speed settings, to multiple interfaces at once instead of configuring each one individually?

    • interface range
    • interface group
    • interface pool
    • interface batch

  3. Why would a network engineer proactively shut down every switch port that is not currently connected to an end device, rather than leaving them enabled?

    • It is required for VLANs to function correctly
    • It reduces the attack surface by preventing an unauthorized device from plugging in and getting immediate network access
    • It automatically saves the running configuration
    • It increases available bandwidth on the active ports

  4. Which command copies the current running configuration to the startup configuration so it persists across a normal reload?

    • copy running-config startup-config
    • copy startup-config running-config
    • erase startup-config
    • reload save

  5. A router interface shows "up, line protocol is down" in show ip interface brief. What can be concluded from that status alone?

    • The interface is fully operational with no issues
    • The interface is administratively shut down
    • The physical layer is up, but the data-link line protocol is not operational; more interface-specific evidence is needed to find the cause
    • The interface has no IP address configured

  6. Which command displays a compact switch-port table with status, VLAN, duplex, and speed columns?

    • show interfaces status
    • show vlan brief
    • show mac address-table
    • show spanning-tree summary

  7. An administrator applies a description to an interface with description Link to SW1. What is the practical benefit of doing this?

    • It changes the interface's IP address automatically
    • It has no functional effect on traffic but documents the interface's purpose for other engineers reading the configuration
    • It enables the interface automatically
    • It is required before an IP address can be assigned