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Certifications›N10-009›Objectives›Network Troubleshooting
Objective 5.0

Network Troubleshooting

N10-009 Practice Questions

Use this page to practise Network Troubleshooting questions for this certification. Focus on how the exam tests network troubleshooting in scenario format — understanding the why behind each answer builds more durable knowledge than memorising options.

Full Practice Test →All Objectives

What this objective tests

N10-009 Network Troubleshooting — Key Topics

Network Troubleshooting questions on this certification test your ability to deploy and manage network troubleshooting concepts in scenario-based situations.

  • Core Network Troubleshooting concepts and how they apply in real-world cloud scenarios.
  • How to deploy network troubleshooting correctly and verify the outcome.
  • Troubleshooting network troubleshooting issues by interpreting error output and system state.
  • Cloud best practices and Network Troubleshooting design trade-offs tested by this certification.

Common exam traps

Where candidates lose marks on Network Troubleshooting

  • ⚠Selecting the most expensive service when a simpler managed option meets the requirement.
  • ⚠Forgetting that cloud resources must be explicitly secured — defaults are rarely secure.
  • ⚠Choosing a global service fix when the issue is region-specific.
  • ⚠Overlooking cost implications of cross-region data transfer in architecture questions.

N10-009 Network Troubleshooting — Practice Questions

30 questions from this objective

Question 2mediummultiple choice
Full question →

A user reports intermittent connectivity on a laptop that moves between floors. The signal strength fluctuates. Which tool would best help identify signal interference and dead zones?

Question 3easymultiple choice
Read the full NAT/PAT explanation →

A user reports that they cannot access the internet, but they can access local resources on the same subnet. The network administrator pings the default gateway and gets a response. Which tool should be used next to trace the path to an external website?

Question 4mediummultiple choice
Open the full VLAN trunking answer →

After replacing a faulty switch, several users in the same VLAN report that they cannot communicate with the server that is on a different subnet. The switch is connected to the router via a trunk port. Which command should the administrator run on the router to verify that the VLAN is allowed on the trunk?

Question 5mediummultiple choice
Full question →

A user reports that they cannot access an internal web server at http://intranet.company.local but can access other internet websites. The technician runs ping intranet.company.local and receives replies successfully. Which tool should the technician use next to isolate the issue?

Question 6easymultiple choice
Review the full subnetting walkthrough →

A user calls the help desk stating that they cannot access any network resources. The technician asks the user to run ipconfig and the output shows an IP address of 169.254.15.20 with a subnet mask of 255.255.0.0. Which of the following is the most likely cause?

Question 7mediummultiple choice
Full question →

A network technician is troubleshooting intermittent internet access for a single user. The user’s workstation can ping the default gateway consistently, but web pages fail to load intermittently. Which of the following should the technician check NEXT?

Question 8hardmultiple choice
Read the full VPN explanation →

A user at a branch office reports that they cannot connect to a file server at the main office. The branch office connects to the main office via a site-to-site VPN, and the VPN tunnel shows as active. The user can ping the main office's default gateway but not the file server. Which of the following should the technician check NEXT?

Question 9mediummultiple choice
Open the full VLAN trunking answer →

A network administrator is troubleshooting communication between two switches connected via a trunk port. The trunk link is up/up, but devices in VLAN 20 cannot communicate across the trunk. The administrator has verified that both switches have VLAN 20 created and that the access ports are configured correctly. Which command should the administrator run on each switch to verify the trunk's allowed VLAN list?

Question 10mediummultiple choice
Read the full DHCP explanation →

A technician is troubleshooting an issue where a wireless client can associate with an access point but cannot obtain an IP address via DHCP. The technician checks the DHCP server and sees no lease requests from the client's MAC address. Which of the following is the most likely cause?

Question 11mediummultiple choice
Review the full subnetting walkthrough →

After replacing a faulty network cable, a user reports that they can access local resources but not the internet. The technician verifies that the user's IP address is 192.168.1.100 with a subnet mask of 255.255.255.0 and a default gateway of 192.168.1.1. The technician can ping the default gateway successfully. Which of the following should the technician check NEXT?

Question 12easymultiple choice
Full question →

A user reports that they can access a website by its IP address but not by its domain name. Which of the following is most likely the issue?

Question 13mediummultiple choice
Read the full DNS explanation →

A user reports that they can access internal resources such as file shares and printers by name, but they cannot access any external websites. The technician checks the IP configuration and finds the workstation has a valid IP address, subnet mask, default gateway, and DNS server addresses. The technician can successfully ping the default gateway and an external IP address like 8.8.8.8. Which of the following should the technician check NEXT?

Question 14easymultiple choice
Read the full DHCP explanation →

A user reports that they can browse to a website by typing its IP address (e.g., 93.184.216.34) but cannot access it by typing the domain name (e.g., www.example.com). The user's workstation receives IP configuration via DHCP. Which of the following is the most likely cause?

Question 15easymultiple choice
Review the full subnetting walkthrough →

A user reports that they cannot access any network resources. The technician checks the IP configuration on the workstation and sees an IP address of 169.254.10.55 with a subnet mask of 255.255.0.0. Which of the following should the technician check NEXT?

Question 16mediummultiple choice
Full question →

Users in a department report that the network is extremely slow. A technician checks the access switch and notices that a single port shows a high number of CRC errors and runts. The link LED is solid green. Which of the following is the most likely cause of the issue?

Question 17easymultiple choice
Review the full subnetting walkthrough →

A user reports that they cannot connect to a file server on the same subnet. The technician checks the IP configuration and sees an IP address of 169.254.5.10. What is the most likely cause?

Question 18mediummultiple choice
Full question →

A user reports intermittent connectivity issues. The technician notices that the link lights on both the PC and the switch are solid, but the user experiences periodic drops. The technician runs a cable test and finds that one pair of wires is open. Which standard is the cable likely violating?

Question 19easymultiple choice
Full question →

A technician is troubleshooting a user's inability to reach a specific website. The user can reach other websites without issue. The technician runs nslookup on the user's workstation and receives the correct IP address for the website. However, a ping to that IP address fails. Which of the following is the most likely cause?

Question 20mediummultiple choice
Full question →

A technician is troubleshooting a loss of network connectivity for a single workstation. The workstation has a valid IP address but cannot ping its default gateway. The link lights on both the workstation and the switch are solid. Which of the following should the technician check NEXT?

Question 21easymultiple choice
Review the full subnetting walkthrough →

A user's workstation shows an IP address of 169.254.15.7 with a subnet mask of 255.255.0.0. The user cannot access any network resources. Which of the following is the most likely cause?

Question 22mediummultiple choice
Read the full DNS explanation →

A user reports that they can access a web server by its IP address (e.g., 10.10.10.50) but cannot access it by its domain name (e.g., server.example.com). The technician verifies that the DNS server is reachable and that the name resolves correctly from other workstations on the same subnet. Which of the following should the technician check NEXT?

Question 23mediummultiple choice
Review the full subnetting walkthrough →

A user reports that they cannot connect to a file server on the same subnet. The technician checks the workstation's IP configuration: IP 192.168.1.10, subnet mask 255.255.255.0, default gateway 192.168.1.1. The workstation can ping the gateway but cannot ping the file server at 192.168.1.50. Which of the following is the most likely cause?

Question 24mediummultiple choice
Review the full subnetting walkthrough →

A user can access a website by its IP address (e.g., 203.0.113.5) but cannot access it by its domain name (example.com). Other users on the same subnet can access the website by domain name. Which of the following should the technician check FIRST?

Question 25mediummultiple choice
Open the full VLAN trunking answer →

A network technician is troubleshooting inter-VLAN routing. Hosts in VLAN 10 can communicate with hosts in VLAN 20, but cannot communicate with hosts in VLAN 30. All VLANs are configured on the same Layer 3 switch with SVIs. Which of the following should the technician verify FIRST?

Question 26mediummultiple choice
Review the full routing breakdown →

A technician is troubleshooting a user's inability to connect to a server. The technician runs 'tracert' from the user's workstation and sees that traffic stops at a particular router. The last hop shows a timeout. Which of the following is the most likely cause?

Question 27mediummultiple choice
Full question →

A user reports that they can access the company's intranet but not the internet. The technician checks the IP configuration and finds that the default gateway is set to 192.168.1.1, and the user can ping that IP. Which of the following is the most likely cause?

Question 28hardmultiple choice
Review the full OSPF breakdown →

Two routers are configured with OSPF in the same area, but they do not form an adjacency. Router A shows OSPF state EXSTART, and Router B shows state EXSTART. Which of the following is the most likely cause?

Question 29mediummultiple choice
Review the full routing breakdown →

A user reports that they can access the internet but cannot access the internal web server at 10.10.10.100. The technician can ping the server's IP from the router that serves as the user's default gateway. Which of the following is the MOST likely cause?

Question 30mediummultiple choice
Full question →

A network technician is troubleshooting a user's inability to connect to the network. The switch port is configured with port security with the default maximum of one MAC address. The user connects a computer and a VoIP phone to the port using the phone's built-in switch. Which of the following will MOST likely occur?

Question 31hardmultiple choice
Full question →

A technician is troubleshooting intermittent connectivity issues on a fiber link between two switches. The link light on both switches is green. Which of the following tools should the technician use to further investigate the issue?

More Network Troubleshooting questions available in the full practice test.

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Previous objective

Network Security

All N10-009 Objectives

  • 1.Networking Concepts
  • 2.Network Implementation
  • 3.Network Operations
  • 4.Network Security
  • 5.Network Troubleshooting