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1.0 Network Infrastructure and Connectivity

Client Connectivity Troubleshooting Practice Questions

New in CCNA v2.0

Diagnosing wired and wireless client issues from Windows, macOS, and Linux.

CCNA v2.0 objective 1.6 · objective map

Author-reviewed by LabFabric · 25 September 2026 · Report a content issue

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

A Windows PC shows the address 169.254.37.12. What does this indicate?

The PC did not receive a DHCP lease and assigned itself an APIPA address

169.254.0.0/16 is the IPv4 link-local range that a host self-assigns when DHCP fails. Check the cable or wireless association, the VLAN, the DHCP server, and any relay or snooping configuration.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

Find related practice in the CCNA path
All 11 Client Connectivity Troubleshooting questions in this set

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

  1. Which Windows command shows the IP address, subnet mask, default gateway, DNS servers and whether DHCP is enabled?

    • ipconfig /all
    • ipconfig /flushdns
    • netstat -an
    • arp -d

  2. Which Linux command shows the IP addresses assigned to interfaces on a modern distribution?

    • ip addr
    • ipconfig /all
    • show ip interface brief
    • netsh interface show

  3. Which macOS Terminal command displays interface addresses and status?

    • ifconfig
    • ipconfig /all
    • ip addr
    • show interfaces

  4. A PC with the address 192.168.10.25/24 can ping other hosts on its subnet but not hosts on other networks, and its default gateway is set to 192.168.20.1. What is wrong?

    • The default gateway is not on the PC's subnet, so it cannot be reached
    • The subnet mask is too long
    • DNS is not configured
    • The PC needs an IPv6 address

  5. A laptop can ping 8.8.8.8 but cannot open websites by name. Which check comes first?

    • The DNS server settings on the client
    • The spanning tree root bridge
    • The trunk allowed VLAN list
    • The router's OSPF process ID

  6. A laptop repeatedly fails to join a WPA3-Personal SSID even though the passphrase is correct, but a phone joins the same SSID. What is the most likely cause on the laptop?

    • The wireless adapter or driver does not support WPA3
    • The laptop's default gateway is wrong
    • The switch port has PortFast enabled
    • The DHCP scope is too small

  7. A wireless client is associated to an access point and shows a valid IP address, but cannot reach any network resources. Which detail would be most useful to check?

    • The signal strength and SNR, plus the gateway and DNS configuration
    • The CPU utilisation of the core router
    • The STP priority of VLAN 1
    • The NTP stratum of the syslog server

  8. Which Windows command releases the current DHCP lease so a new one can be requested?

    • ipconfig /release followed by ipconfig /renew
    • ipconfig /displaydns
    • netsh wlan disconnect only
    • route delete 0.0.0.0

  9. Which Linux command shows the default gateway that the host uses?

    • ip route
    • ip link set up
    • arp -f
    • hostname -I

  10. A new Windows laptop cannot join the WPA2-Enterprise SSID. Other laptops join it, the user's credentials work on the web portal, and the RADIUS log shows the laptop ending the exchange before sending credentials. What is the most likely cause?

    • The laptop does not trust the certificate the RADIUS server presents during 802.1X authentication
    • The access point's channel is too crowded for another client
    • The laptop's DHCP lease has expired and must be renewed
    • The SSID is hidden, so the laptop cannot see its beacons

  11. On a Windows laptop, which command shows the SSID the adapter is connected to along with its authentication type and cipher, such as WPA2-Personal and CCMP?

    • ipconfig /all
    • netsh wlan show interfaces
    • route print
    • arp -a