Practice 220-1201 IP Addressing questions with full explanations on every answer.
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A technician is troubleshooting a network where two computers cannot communicate. Computer A has an IP of 192.168.1.10 with subnet mask 255.255.255.0. Computer B has an IP of 192.168.2.20 with subnet mask 255.255.255.0. Both are connected to the same switch. The switch is not configured with VLANs. Why can't the computers communicate?
2A user complains that they cannot access a website by its domain name, but they can access it by typing the IP address directly. The user's computer is configured to obtain DNS automatically. What is the most likely issue?
3A user reports that they can only access the internet intermittently. The technician runs ipconfig and sees an IPv4 address of 192.168.1.105 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully, but pings to 8.8.8.8 fail. What is the most likely issue?
4A company has a network with the IP range 172.16.0.0/16. They need to create 8 separate subnets for different departments, each with at least 1000 usable hosts. What subnet mask should be used?
5A user reports that their laptop can connect to the internet when using a wired connection at home, but cannot connect to any network resources when using Wi-Fi at the office. The office uses DHCP with a scope of 192.168.10.0/24. The laptop's IP configuration shows an address of 169.254.15.22. What is the most likely cause of this issue?
6A network administrator is designing a new subnet scheme for a company with 4 departments: Sales (50 devices), HR (25 devices), IT (10 devices), and Management (5 devices). The company uses the 10.0.0.0/8 network. To minimize wasted IP addresses, which subnet mask should be used for the Sales department?
7A technician is troubleshooting a network where several users cannot access the internet, but they can communicate with each other. The network uses a router with IP 10.0.0.1 and a subnet mask of 255.255.255.0. All computers have IPs in the 10.0.0.0/24 range. What is the most likely cause?
8A technician is configuring a small office network with 15 computers and a single router. The router's WAN port is connected to a cable modem, and the LAN port is connected to a switch. All computers are connected to the switch. The technician assigns the router's LAN interface the IP 192.168.0.1/24. What should be the default gateway setting on each computer?
9A technician is setting up a new server that must always have the same IP address on a network using DHCP. The network administrator wants to avoid manually configuring the server's IP to prevent misconfiguration. Which method should be used to ensure the server receives the same IP from the DHCP server?
10A small business uses a router with a default IP of 192.168.1.1. The owner wants to set up a new printer with a static IP of 192.168.1.50. After configuring the printer, it cannot be accessed from any computer on the network. All computers are set to obtain IP addresses automatically. What is the most likely problem?
11A technician is troubleshooting a user's computer that cannot access a web server at 10.10.10.50. The user's IP is 10.10.20.15 with subnet mask 255.255.0.0. The technician can ping 10.10.10.50 from the user's computer. What should the technician check next?
12A user reports that they cannot access the internet, but they can ping other devices on the local network. The technician checks the IP configuration and sees: IP: 192.168.1.25, Subnet Mask: 255.255.255.0, Default Gateway: 192.168.2.1. What is the issue?
13A technician is troubleshooting a user's inability to reach a server at 172.16.50.100. The user's IP is 172.16.50.50 with subnet mask 255.255.255.0. The technician runs a traceroute and sees the first hop is the gateway (172.16.50.1), but the second hop times out. What does this indicate?
14A customer reports that their laptop can connect to the internet at home but not at a coffee shop. The coffee shop uses a /24 subnet with a gateway of 192.168.1.1. The laptop's IP is 192.168.2.10. What is the most likely cause?
15A technician is setting up a small office with 15 devices and needs to assign private IP addresses. The router's LAN interface is 10.0.0.1/24. Which of the following is a valid IP address for a workstation on this network?
16A small business uses a router with DHCP enabled, issuing addresses in the 192.168.1.0/24 range. A technician installs a new server with a static IP of 192.168.1.50, but users cannot connect to it. The technician pings 192.168.1.50 from the server itself successfully. What is the most likely cause?
17A technician is configuring a new printer on a network with the IP 172.16.0.50 and subnet mask 255.255.0.0. The router's LAN IP is 172.16.0.1. A workstation with IP 172.16.1.10 can ping the printer, but a workstation with IP 172.17.0.10 cannot. What is the most likely reason?
18A network administrator is troubleshooting a connectivity issue between two servers. Server A has IP 192.168.10.25/25, and Server B has IP 192.168.10.200/25. Server A can ping its default gateway (192.168.10.1) but cannot ping Server B. What is the most likely cause?
19A technician is setting up a new branch office and needs to assign IPs to 30 devices. The ISP provided a public IP block of 203.0.113.0/28. The technician decides to use private IPs internally and NAT. Which of the following is the most appropriate private IP range for this network?
20A technician is configuring a router with two interfaces: WAN (DHCP from ISP) and LAN (static IP 10.0.0.1/24). The technician sets the LAN subnet mask to 255.255.255.0. A workstation is assigned IP 10.0.0.100/24 and can ping the router, but cannot access the internet. The router's WAN interface has IP 203.0.113.5/30. What is the most likely missing configuration?
21A technician is setting up a new file server and needs to assign it a static IP address. The network uses a subnet of 192.168.1.0/24, and the router's LAN IP is 192.168.1.1. The technician wants to ensure the server is reachable from all devices on the local network. Which of the following IP addresses should the technician assign to the server?
22A network engineer is designing a subnet scheme for a company with three departments: Sales (50 devices), HR (20 devices), and IT (10 devices). The company uses the 10.0.0.0/24 network. To minimize waste, the engineer decides to use variable-length subnet masking (VLSM). Which of the following subnet masks should be assigned to the Sales department?
23A technician is configuring a small branch office network with 30 devices. The network uses a single router with DHCP enabled. To conserve IP addresses, the technician decides to use a subnet that provides exactly enough usable addresses for the devices, with minimal waste. Which subnet mask should the technician choose?
24A technician is setting up a small network for a home office. The router's WAN port receives a public IP of 203.0.113.5 from the ISP. The technician configures the LAN with a private IP range. Which of the following is a valid private IP address for the technician to assign to a workstation?
25A customer reports that their new printer, configured with a static IP of 192.168.1.100, cannot be accessed from any computer on the network. The technician pings 192.168.1.100 from a workstation and gets no reply. The workstation's IP is 192.168.1.50 with a subnet mask of 255.255.255.0. What is the most likely cause?
26A user reports that their laptop cannot connect to the internet, but other devices on the same network work fine. The technician runs ipconfig and sees an IP address of 169.254.12.34 with a subnet mask of 255.255.0.0. What is the most likely cause of this issue?
27A small office uses a single router with a built-in DHCP server. The office has 15 devices that need IP addresses. The router's default subnet mask is 255.255.255.0. How many usable IP addresses are available for devices on this subnet?
28A technician is configuring a new router for a branch office. The ISP provides a public IP of 203.0.113.10/30 for the WAN interface. How many usable IP addresses does the technician have for devices on the WAN link?
29A technician is troubleshooting a network where a user cannot access the internet. The user's workstation has an IP of 192.168.1.15, subnet mask 255.255.255.0, and default gateway 192.168.1.1. The technician pings 192.168.1.1 successfully but cannot ping 8.8.8.8. What is the most likely cause?
30A technician is troubleshooting a network where a user cannot access a web server at 10.0.0.50. The user's workstation has an IP of 10.0.0.25 with a subnet mask of 255.255.255.0. The technician pings 10.0.0.50 and gets a reply, but the web page does not load. What should the technician check next?
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