Practice 220-1201 Network Configuration Concepts questions with full explanations on every answer.
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A small office has a single router with four LAN ports. The network uses the 192.168.1.0/24 subnet, and the router's LAN IP is 192.168.1.1. A technician needs to add a new printer that must have a static IP address outside the DHCP range (192.168.1.100-192.168.1.200) but still be reachable by all devices. Which IP address should the technician assign to the printer?
2A technician is configuring a new wireless router for a home office. The customer wants to ensure that guests can access the internet but cannot see other devices on the main network. Which feature should the technician enable on the router?
3A customer reports that their laptop connects to the office Wi-Fi but cannot access the internet. Other devices on the same network work fine. The technician checks the laptop's IP configuration and sees an IP address of 169.254.15.22. What is the most likely cause of this issue?
4A network administrator is configuring a small business network with two subnets: 192.168.1.0/24 for employees and 192.168.2.0/24 for guests. The router has two LAN interfaces with IPs 192.168.1.1 and 192.168.2.1. A technician connects a new access point to the guest subnet switch and configures it with a static IP of 192.168.2.50. The access point can ping the router's guest interface but cannot reach the internet. The router's default route points to an ISP modem at 203.0.113.1. What is the most likely missing configuration?
5A technician is troubleshooting a connectivity issue where a user's computer can ping the default gateway but cannot access a web server at 203.0.113.50. The technician runs a tracert and sees that the first hop responds, but subsequent hops time out. What is the most likely cause?
6A company's network uses a /24 subnet mask. The IT manager asks a technician to configure a new server with a static IP address of 192.168.1.300. The technician knows this is invalid. What is the reason this IP address cannot be used?
7A user complains that their desktop computer cannot connect to any network shares, but they can access the internet. The technician pings the file server by IP address successfully, but pinging by hostname fails. Which network configuration issue is most likely causing this problem?
8A technician is troubleshooting a slow network connection for a user. The user's computer has an IP address of 192.168.1.100, subnet mask 255.255.255.0, and default gateway 192.168.1.1. The technician runs a ping to the gateway and gets replies with times around 2ms. However, pinging a server at 192.168.1.200 results in times over 500ms. The technician checks the switch and finds that the port for the user's computer is set to 10 Mbps half-duplex, while the computer's NIC is set to auto-negotiation. What is the most likely cause of the high latency?
9A user reports that their laptop can connect to the corporate Wi-Fi but cannot access any network resources. The technician checks the IP configuration and sees an IP 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 cannot ping a server at 192.168.2.10. What is the most likely issue?
10A technician is setting up a new office network with 50 devices. The network must support growth up to 100 devices. The technician chooses a subnet mask of 255.255.255.0. How many usable host addresses does this subnet provide?
11A technician is troubleshooting a network where users report intermittent connectivity. The technician finds that the switch logs show excessive CRC errors on multiple ports connected to different workstations. What is the most likely cause of these errors?
12A user reports that their computer cannot connect to a network share. The technician runs ipconfig and sees an IP address of 169.254.1.5. What is the most likely cause?
13A small office has a single router with four LAN ports. The network uses 192.168.1.0/24. A new printer is assigned a static IP of 192.168.1.256. What will happen when the printer is connected?
14A technician is setting up a new wireless network for a small office. The office has three access points (APs) that should allow seamless roaming. The technician configures all APs with the same SSID and security settings. What additional configuration is necessary to prevent clients from staying connected to a weak signal?
15During a network upgrade, a technician replaces an old 10/100 Mbps switch with a new gigabit switch. After the change, several users report that their internet connection is slow. The technician checks the switch and sees that some ports show 100 Mbps instead of 1000 Mbps. What is the most likely cause?
16A customer reports that their laptop connects to the office Wi-Fi but cannot access the internet. Other devices on the same network work fine. What is the most likely cause of this issue?
17A user wants to connect a new laptop to a wired network that uses 802.1X authentication. What must be configured on the laptop to ensure successful network access?
18A network administrator is configuring a new firewall to allow remote employees to securely access internal resources. The requirement is to encrypt all traffic between the remote client and the internal network. Which protocol should be used?
19A company has a network with multiple VLANs. A user in VLAN 10 cannot access a server in VLAN 20, but other users in VLAN 10 can access the server. The technician checks the switch configuration and finds that the port for the user is set to access mode for VLAN 10. What should be configured to allow this user to reach the server?
20A company deploys a new VoIP system. Users report that calls drop frequently. The network uses a single flat subnet with no QoS configured. The technician monitors traffic and sees high bandwidth utilization during peak hours. What is the most effective solution to improve call quality?
21A technician is troubleshooting a network where users on one floor cannot access a server on another floor. Both floors are connected via a single fiber optic link. The technician checks the link and sees the switch port shows 'err-disabled' status. What is the most likely cause of this state?
22During a network upgrade, a technician needs to connect two switches that are 120 meters apart using a copper Ethernet cable. The cable run must support 1 Gbps speeds. Which cable type and configuration should be used?
23A technician is setting up a new VoIP phone system. To ensure voice quality, they need to prioritize voice traffic over data traffic on the network. Which QoS configuration method should be implemented?
24A small office uses a single router with four LAN ports. The manager wants to connect 12 wired devices and ensure they can all communicate with each other without purchasing a new router. Which network device should be added to the existing setup?
25A user complains that their laptop frequently disconnects from the Wi-Fi when they move to a different room, but other devices in that room work fine. The technician checks the laptop's wireless adapter settings. Which configuration is most likely causing the issue?
26A network administrator needs to segment traffic between the accounting and HR departments to prevent unauthorized access, while still allowing both to reach the internet. The company uses a single managed switch and a router. Which configuration approach meets these requirements?
27A technician is configuring a small network with five computers and a printer. The network must use private IP addresses and allow all devices to communicate. The technician assigns IPs manually but forgets to set a default gateway on one computer. Which functionality will be lost on that computer?
28A user reports that their laptop cannot connect to the internet, but other devices on the same wired network work fine. The technician checks the IP configuration and sees the laptop has an IP address of 169.254.3.12. What is the most likely cause?
29A company's web server is accessible from the internal network but not from the internet. The server has a static IP of 192.168.1.10. The firewall is configured to allow HTTP and HTTPS traffic. What is the most likely missing configuration?
30A company's IT policy requires that all network traffic from the guest Wi-Fi be isolated from the internal corporate network. The guest network uses a separate SSID and VLAN. Which additional configuration is necessary to ensure complete isolation?
The Network Configuration Concepts domain covers the key concepts tested in this area of the 220-1201 exam blueprint published by CompTIA. Courseiva provides free domain-focused practice, mock exams, missed-question review, and readiness tracking across all 220-1201 domains — no account required.
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