IP Address Conflicts Troubleshooting Quiz

1. A network has subnet mask 255.255.255.0. How many usable host addresses are available?

254

256

255

252

2. To prevent DHCP from assigning an IP to a specific device, what should be configured?

Exclude the device's IP from the DHCP scope

Block the device's MAC address at the router

Assign the device a static IP outside the DHCP range

All of the above

3. Which scenario best describes an IP address conflict?

Two devices have the same IP on the same subnet

A device has both IPv4 and IPv6 addresses

The subnet mask does not match the network range

The default gateway is unreachable

4. The DHCP lease time is set to 8 days. A mobile device connects briefly, then leaves. What happens?

IP immediately returns to the pool

IP remains assigned until lease expires

Device receives APIPA address

Lease is automatically renewed

5. A device shows IP 169.254.1.1 after failing DHCP. To resolve this, what action is appropriate?

Assign a static IP outside the DHCP range

Verify DHCP server is running and reachable

Reconfigure the default gateway

Clear the DNS cache

6. If two hosts both claim the same MAC address, what network issue occurs?

IP address conflict

MAC address conflict

Subnet mask mismatch

Gateway routing error

7. A user reports 'no network connection' but ipconfig shows a valid IP address. What should you check next?

Ping the default gateway

Restart the computer

Check DHCP server logs

Reconfigure DNS settings

8. Which Windows utility displays all active network connections and their associated IP addresses?

Ping

Netstat

Tracert

Arp -a

9. An administrator excludes 192.168.1.1 to 192.168.1.50 from the DHCP pool. This prevents ____.

Gateway conflicts

DHCP assignment of addresses used by static devices

DNS resolution errors

Subnet mask errors

10. What is the primary cause of IP address conflicts in DHCP environments?

Subnet mask misconfiguration

DHCP scope exhaustion or manual static addresses within DHCP range

Gateway IP mismatch

DNS server failure

11. What does APIPA stand for?

Automatic Private IP Addressing

Advanced Protocol Internet Allocation

Automated Public IP Adapter

Automatic Protocol Internet Assignment

12. To release and renew a DHCP lease on Windows, which command is used?

Ipconfig /renew

Ipconfig /release followed by ipconfig /renew

Ipconfig /flushdns

Ipconfig /all

13. A host cannot reach the DHCP server due to network misconfiguration. What address will it auto-assign?

192.168.0.1

169.254.x.x

127.0.0.1

0.0.0.0

14. Which of the following indicates a successful IP address conflict resolution?

Ping command returns 'Request timed out'

Ping command receives consistent replies from only one host

Device shows APIPA address

DHCP server shows duplicate leases

15. A DHCP server assigns IP addresses from a pool of 192.168.1.100 to 192.168.1.150. If a static device uses 192.168.1.125, what network problem results?

IP address conflict when DHCP assigns that address

Subnet mask mismatch

Gateway timeout

DNS lookup failure

16. What command displays the IP configuration on a Windows system?

Ifconfig

Ipconfig

Netstat -a

Route print

17. A workstation is configured with a static IP of 192.168.1.50, but another device is also using this address. What should you do first?

Restart the DHCP server

Verify the IP conflict using ping and check device configurations

Immediately power off both devices

Reconfigure the entire subnet

18. Which tool can verify if another host is using a specific IP address?

Ping

Nslookup

Tracert

Ipconfig /release

19. When two devices on the same network have the same IP address, what network condition occurs?

IP gateway conflict