Practice 220-1201 Network Troubleshooting questions with full explanations on every answer.
Start practicing
Network Troubleshooting — choose a session length
Free · No account required
Click any question to see the full explanation and answer options, or start a focused practice session above.
During a site survey, a technician finds that users in the break room experience very slow Wi-Fi while those in offices nearby have excellent speeds. What is the most likely cause?
2A technician is troubleshooting a network where users can access the internet but cannot reach a specific internal web server by its hostname. Pinging the server's IP address works. What is the most likely issue?
3A user's laptop cannot connect to any network after a recent OS update. The Wi-Fi adapter shows as enabled in Device Manager with no errors, and other devices on the same network work fine. What should the technician do first?
4A user reports that their VoIP phone works but the PC connected to the phone's passthrough port has no network access. What should the technician check first?
5After deploying a new 802.11ac access point, users report that some devices can connect but others cannot, even though they are in the same room. All devices support 5 GHz. What is the most likely cause?
6A company's remote site connects to the main office via a site-to-site VPN. Recently, users at the remote site report that they can access internal servers at the main office but cannot reach the internet. The main office users have full internet access. What is the most likely cause?
7A customer reports that their laptop can connect to the internet via Wi-Fi but cannot access any network shares on the local file server. Other devices on the same network can access the shares. What is the most likely cause?
8A small office uses a single router with four switch ports. Users on port 4 cannot access the internet, but they can communicate with each other. Port 4's LED is solid green. What is the most likely cause?
9A user complains that their desktop PC loses network connectivity intermittently, especially when the printer on the same desk starts printing. What is the most likely cause?
10A technician is called to a warehouse where a newly installed IP camera shows 'No Signal' on the NVR. The camera is connected via a 100-meter Cat6 cable to a PoE switch. The switch port LED is off. What is the most likely cause?
11A technician is setting up a new wireless network in a crowded office building. Users report that their laptops frequently disconnect from the Wi-Fi and have slow speeds, even when close to the access point. The technician scans the area and sees many overlapping Wi-Fi networks. What is the best solution to improve performance?
12A customer complains that their VoIP phone intermittently drops calls and has poor audio quality. The phone is connected to a switch port that also carries data traffic for a nearby workstation. What is the most likely cause?
13A user’s laptop is connected to a Wi-Fi network with a strong signal, but the user cannot access any network resources. The IP configuration shows an address of 192.168.1.50 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician pings the gateway successfully. What should the technician check next?
14A user reports that their computer is connected to the network but cannot access any websites. The technician checks the IP configuration and sees an IP address of 169.254.1.5. What does this indicate?
15A user reports that their computer can access the internet but cannot connect to a network printer that is on the same subnet. The technician pings the printer’s IP address from the computer and gets a reply. What is the most likely cause?
16A user reports that their laptop can connect to the internet via Ethernet but cannot connect to any Wi-Fi networks. The wireless adapter is enabled and shows available networks, but connecting always fails. What is the most likely cause?
17A small office has a single switch connecting all workstations. Several users report that they cannot access the internet, but they can still communicate with each other on the local network. What is the most likely cause?
18During a network upgrade, a new switch is installed. After connecting all devices, one workstation cannot obtain an IP address via DHCP, while all other workstations on the same switch work fine. What is the first step to troubleshoot this issue?
19A 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, and the router’s public IP is 203.0.113.50. What configuration is most likely missing?
20A network administrator is troubleshooting intermittent connectivity issues on a fiber optic link between two buildings. The link works but has occasional errors. The technician inspects the fiber and finds that the connectors are dirty. After cleaning them, the issue persists. What should the technician check next?
21A user reports that their laptop's Wi-Fi connection drops every 10 minutes, but reconnects immediately. The technician notices that the laptop is connected to a 5 GHz SSID. What is the most likely cause?
22A small office has a single switch connecting all workstations. Users report that they can see each other on the network but cannot access the internet. The router's link light is off. What should the technician check first?
23During a network upgrade, a technician installs a new 802.11ax (Wi-Fi 6) access point in a conference room. Users now report intermittent disconnections on their older laptops. What is the most likely cause?
24A customer complains that their desktop computer loses network connectivity every time a large file is transferred. The issue does not occur during normal web browsing. What hardware component is most likely at fault?
25A user reports that their laptop can connect to the corporate Wi-Fi but cannot access the internet. Other devices on the same network work fine. What is the most likely cause of this issue?
26A technician is troubleshooting a network where a single workstation cannot access any network resources. The link light on the NIC is solid, and the IP configuration shows an address of 192.168.1.100 with a subnet mask of 255.255.255.0. The workstation can ping its own IP but not the default gateway (192.168.1.1). What is the most likely cause?
27A technician is troubleshooting a network where a user's PC has an IP address of 169.254.12.34. The PC is connected to a switch that is uplinked to a router with DHCP enabled. What is the most likely cause?
28A company's network uses a 10.0.0.0/8 private IP scheme. A remote user connects via VPN and gets an IP of 172.16.0.5. They can access the internet but cannot reach internal servers at 10.1.1.50. What is the most likely cause?
29A technician is setting up a new printer on a network. The printer has a static IP address of 192.168.1.50, but users cannot ping it from their workstations. The workstations are on the 192.168.1.0/24 subnet. What should the technician check first?
30A company deploys a new VoIP phone system. Users report that calls are choppy and sometimes drop. The network uses a single flat subnet with no QoS. What is the most likely cause?
The Network Troubleshooting 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.
The Courseiva 220-1201 question bank contains 30 questions in the Network Troubleshooting domain. Click any question to see the full explanation and answer breakdown.
Start with a 10-question focused session to identify your baseline accuracy in this domain. Read every explanation — even for questions you answer correctly — to understand the reasoning. Once you score consistently above 80%, move to a 20–30 question session to confirm depth before moving to the next domain.
Yes — the session launcher on this page draws questions exclusively from the Network Troubleshooting domain. Choose 10, 20, 30, or 50 questions for a focused session, or click individual questions to review them one by one.
Save your results, see per-domain analytics, and get readiness scores — free, for every certification.
Sign Up FreeFree forever · Every certification included