4.2 - Troubleshoot IP Configuration Issues

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Indiana Institute of Technology *

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2000

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Computer Science

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Feb 20, 2024

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Question 1: You manage a network that has multiple internal subnets. You connect a workstation to the 192.168.1.0/24 subnet. This workstation cannot communicate with any other host on the network. You run ipconfig /all and see the following: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix. : mydomain.local Description . . . . . . . : Broadcom network adapter Physical Address . . . . . : 00-AA-BB-CC-74-EF DHCP Enabled. . . . . . . : No Autoconfiguration Enabled . . : Yes IPv4 Address. . . . . . . : 192.168.2.102(Preferred) Subnet Mask . . . . . . . : 255.255.255.0 Default Gateway. . . . . . : 192.168.1.1 DNS Servers . . . . . . . : 192.168.2.20 What is the MOST likely cause of the problem? Incorrect default gateway Incorrect DNS server address Incorrect subnet mask Incorrect IP address Explanation In this example, the IP address assigned to the host is on the wrong subnet. The host address is on the 192.168.2.0/24 subnet, but the other devices are using addresses on the 192.168.1.0 subnet (the scenario states that you're connecting the workstation to this subnet). Question 2: Which command should you use to see how a network interface is configured in the command prompt? ipconfig /release ipconfig /flushdns ipconfig /all ipconfig /renew Explanation ipconfig /all displays a detailed list of the current IP configuration. To force a computer to receive a new IP configuration, you use the ipconfig /release command followed by the ipconfig /renew command. ipconfig /flushdns removes all entries from the DNS resolver cache.

ipconfig displays basic IP configuration information. Question 3: Which of the following is needed for clients to communicate with hosts outside of the local subnet? Domain Name System Default gateway IP address Subnet mask Explanation The default gateway identifies the router to which communications for remote networks are sent. Without a default gateway set, most clients can't communicate with hosts outside of the local subnet. The IP address identifies both the logical host and logical network addresses. The subnet mask identifies the portion of the IP address that is the network address, and the portion that is the host address. The Domain Name System (DNS) server address identifies the DNS server that is used to resolve host names to IP addresses. Question 4: You administer a network with Windows Server 2022, UNIX servers, and Windows 10, and Macintosh clients. A Windows computer user calls you one day and says that he is unable to access resources on the network. You type ipconfig on the user's computer and receive the following output: 0 Ethernet adapter: IP address. . . . . . . . . : 169.254.1.17 Subnet Mask . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . : You also check your NIC and see that the link light is on. What might the problem be in this scenario? A missing default gateway The user changed their computer's configuration An unavailable DHCP server A bad NIC Explanation

If a Windows client computer is configured to use DHCP and can't locate one to receive IP addressing information, it assigns itself an IP address from the APIPA (Automatic Private IP Addressing) range of IP addresses. APIPA addresses include IP addresses from 169.254.0.0 to 169.254.255.254 and are reserved for this purpose. A lit link light on your NIC indicates a connection to the network. Question 5: You are a network technician for a small consulting firm. One of your users is complaining that they are unable to connect to the local intranet site. After some troubleshooting, you've determined that the intranet site can be connected to by using the IP address but not the hostname. Which of the following would be the MOST likely reason for this? Incorrect DHCP configuration Incorrect subnet mask Incorrect default gateway Incorrect DNS settings Explanation In this scenario, the most likely cause would be incorrect DNS settings. Since you can connect to the intranet site using the IP address but not the hostname, this points to a DNS issue. None of the other options would be an issue here since you're able to connect to the intranet site with the IP address. Question 6: Incorrect You manage a network that has multiple internal subnets. You connect a workstation to the 192.168.1.0/24 subnet. This workstation can communicate with some hosts on the private network, but not with other hosts. You run ipconfig /all and see the following: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : mydomain.local Description . . . . . . . : Broadcom network adapter Physical Address. . . . . . : 00-AA-BB-CC-74-EF DHCP Enabled . . . . . . . : No Autoconfiguration Enabled. . . : Yes IPv4 Address . . . . . . . : 192.168.1.102(Preferred) Subnet Mask . . . . . . . : 255.255.255.0 Default Gateway. . . . . . . . . : 192.168.2.1 DNS Servers. . . . . . . . . . . : 192.168.2.20 What is the most likely cause of the problem? Incorrect subnet mask

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Incorrect IP address Incorrect default gateway Incorrect DNS server address Explanation In this example, the default gateway address is incorrect. The default gateway address must be on the same subnet as the IP address for the host. The host address is on the 192.168.1.0/24 subnet, but the default gateway address is on the 192.168.2.0 subnet. Question 7: Which of the following identifies both the logical host and logical network addresses? Domain Name System Default gateway IP address Subnet mask Explanation The IP address identifies both the logical host and logical network addresses. The subnet mask identifies the portion of the IP address that is the network address, and the portion that is the host address. The default gateway identifies the router to which communications for remote networks are sent. The Domain Name System (DNS) server address identifies the DNS server that is used to resolve host names to IP addresses. Question 8: You manage a network that has multiple internal subnets. You connect a workstation to the 192.168.1.0/24 subnet. This workstation can communicate with some hosts on the private network, but not with other hosts. You run ipconfig /all and see the following: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : mydomain.local Description . . . . . . . : Broadcom network adapter Physical Address. . . . . . : 00-AA-BB-CC-74-EF DHCP Enabled . . . . . . . : No Autoconfiguration Enabled. . . : Yes IPv4 Address . . . . . . . : 192.168.1.102(Preferred) Subnet Mask. . . . . . . . : 255.255.0.0 Default Gateway . . . . . . : 192.168.1.1 DNS Servers . . . . . . . : 192.168.1.20 192.168.1.27

What is the MOST likely cause of the problem? Incorrect IP address Incorrect DNS server address Incorrect subnet mask Incorrect default gateway Explanation In this example, the network is using a mask of 255.255.255.0 (24-bits), but the workstation is configured to use a mask of 255.255.0.0. Question 9: Which two commands do you use to force a new IP configuration? ipconfig /flushdns ipconfig ipconfig /all ipconfig /renew ipconfig /release Explanation To force a computer to receive a new IP configuration, you use the ipconfig /release command followed by the ipconfig /renew command. ipconfig /flushdns removes all entries from the DNS resolver cache. ipconfig displays basic IP configuration information. ipconfig /all displays a detailed list of the current IP configuration. Question 10: You are a network technician for a small consulting firm. Many users have reported issues with accessing the network. After some initial troubleshooting, you discover that many devices have the same IP address assigned or incorrect IP configurations. Which of the following would be the MOST likely cause for this? Rogue DHCP server Rogue DNS server Exhausted DHCP scope

Incorrect default gateway Explanation In this scenario, a rogue DHCP server would be the most likely cause for the duplicate and incorrect IP configurations. A rogue DHCP server is an unauthorized DHCP server. When a rogue DHCP server exists on a network, some hosts will receive configuration information from the correct DHCP server and others from the rogue one. This will lead to conflicting and incorrect IP configurations. Exhausted DHCP scope means that all the addresses within the DHCP scope were depleted. Consequently, a legitimate user is denied an IP address requested through DHCP and isn't able to access the network. This would not cause duplicate or incorrect IP configurations. The gateway is responsible for routing traffic between networks. This would not cause duplicate or incorrect IP configurations. DNS is responsible for translating hostnames to IP addresses. This would not cause duplicate or incorrect IP configurations.

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