220-1201 IP Addressing Practice Test 2 — 15 Questions

Question 1

A 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?

Accepted Answer

Another device on the network has the same IP address.. If the DHCP server assigned 192.168.1.50 to another device, there is an IP address conflict. The server can ping itself because it uses its own IP, but other devices may have the same IP or the server's address is already in use. This tests understanding of IP conflicts and static vs. DHCP assignments.

Answer

The server's subnet mask is set to 255.255.255.0.

Answer

The server's default gateway is missing.

Answer

The server's network cable is faulty.

Question 2

A 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?

Accepted Answer

The workstation with IP 172.17.0.10 is on a different network and needs a router to reach the printer.. The subnet mask 255.255.0.0 means the network is 172.16.0.0/16, so 172.16.1.10 is on the same network, but 172.17.0.10 is on a different network (172.17.0.0/16). Without a router between them, they cannot communicate. This tests understanding of subnetting and how the subnet mask defines the network boundary.

Answer

The printer's subnet mask is wrong.

Answer

The printer has a duplicate IP address.

Answer

The default gateway on the printer is missing.

Question 3

A 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?

Accepted Answer

The servers are on different subnets and require a router to communicate.. A /25 subnet mask (255.255.255.128) divides the 192.168.10.0/24 network into two subnets: 192.168.10.0/25 (hosts 1-126) and 192.168.10.128/25 (hosts 129-254). Server A (25) is on the first subnet, Server B (200) on the second. They need a router to communicate. This tests advanced subnetting.

Answer

Server A has a duplicate IP address.

Answer

The subnet mask is incorrect on one of the servers.

Answer

The default gateway is misconfigured.

Question 4

A 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?

Accepted Answer

192.168.1.0/24. For a small network with 30 devices, a /24 subnet (e.g., 192.168.1.0/24) provides 254 usable addresses, which is sufficient. The /28 public block is for the WAN interface. This tests knowledge of private IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and subnet sizing.

Answer

203.0.113.1 to 203.0.113.14

Answer

10.0.0.0/8

Answer

172.16.0.0/12

Question 5

A 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?

Accepted Answer

The router lacks a default route pointing to the ISP's gateway.. The workstation can reach the router, so the LAN is fine. The router has a WAN IP, but without a default route (or NAT), traffic from the LAN cannot be forwarded to the internet. The /30 WAN subnet only has two usable IPs, so the router needs a route to the ISP's next hop. This tests routing and NAT concepts.

Answer

The workstation's default gateway is set to 10.0.0.1.

Answer

The WAN subnet mask should be 255.255.255.0.

Answer

The LAN subnet mask should be 255.255.0.0.

Question 6

A 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?

Accepted Answer

192.168.1.50. For a /24 subnet (255.255.255.0), usable addresses range from 192.168.1.1 to 192.168.1.254, but .1 is typically reserved for the router. The technician should choose an address outside the DHCP pool, such as 192.168.1.50, to avoid conflicts.

Answer

192.168.1.0

Answer

192.168.1.255

Answer

192.168.2.1

Question 7

A 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?

Accepted Answer

255.255.255.192. With VLSM, the largest subnet should be assigned first. Sales needs 50 usable addresses, so a /26 subnet (255.255.255.192) provides 62 usable addresses, which is sufficient and efficient. Smaller subnets would not accommodate 50 devices.

Answer

255.255.255.128

Answer

255.255.255.224

Answer

255.255.255.240

Question 8

A 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?

Accepted Answer

255.255.255.224. A /27 subnet (255.255.255.224) provides 30 usable addresses (32 total minus 2 reserved). This is the smallest subnet that accommodates 30 devices without wasting many addresses.

Answer

255.255.255.0

Answer

255.255.255.240

Answer

255.255.255.192

Question 9

A 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?

Accepted Answer

192.168.1.10. Private IP addresses are defined in RFC 1918: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. 192.168.1.10 falls within the 192.168.0.0/16 range, making it a valid private address for LAN use.

Answer

172.32.1.10

Answer

203.0.113.10

Answer

169.254.1.10

Question 10

A 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?

Accepted Answer

The printer's static IP address conflicts with another device on the network.. Both devices are on the same /24 subnet, so the issue is not a subnet mismatch. The most common cause is an IP address conflict, where another device already uses 192.168.1.100, or the printer is not properly connected.

Answer

The printer's IP address is on a different subnet than the workstation.

Answer

The workstation's subnet mask is set to 255.255.0.0.

Answer

The printer's default gateway is misconfigured.

Question 11

A 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?

Accepted Answer

The DHCP server is not responding to the laptop's request.. An IP address in the 169.254.0.0/16 range is an Automatic Private IP Addressing (APIPA) address, assigned when a DHCP server is unreachable. This indicates the laptop failed to obtain a valid IP from the router's DHCP server.

Answer

The laptop has a static IP address configured incorrectly.

Answer

The subnet mask is wrong; it should be 255.255.255.0.

Answer

The laptop's network adapter is faulty.

Question 12

A 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?

Accepted Answer

254. The subnet mask 255.255.255.0 corresponds to a /24 network, which provides 256 total addresses. After reserving the network address and broadcast address, 254 usable IP addresses remain, which is more than enough for 15 devices.

Answer

255

Answer

256

Answer

15

Question 13

A 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?

Accepted Answer

2. A /30 subnet mask (255.255.255.252) provides 4 total addresses: one network, one broadcast, and two usable. This is commonly used for point-to-point WAN links to conserve public IPs.

Answer

4

Answer

6

Answer

1

Question 14

A 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?

Accepted Answer

The router's WAN connection is down or misconfigured.. Successful ping to the gateway indicates local network connectivity is fine. Failure to ping an external IP like 8.8.8.8 suggests the router cannot reach the internet, possibly due to an ISP issue or misconfigured WAN settings.

Answer

The workstation's subnet mask is incorrect.

Answer

The DNS server is not configured on the workstation.

Answer

The workstation's IP address is a duplicate.

Question 15

A 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?

Accepted Answer

Check if the web server's firewall is blocking HTTP/HTTPS traffic.. Since ping succeeds, Layer 3 connectivity (IP) is working. The issue is likely at Layer 4 (transport) or above, such as a firewall blocking the web port (80/443) or a misconfigured web server.

Answer

Verify the default gateway on the workstation.

Answer

Change the workstation's IP address to a different subnet.

Answer

Replace the network cable between the workstation and switch.