Network Troubleshooting for CompTIA Network+

Sample Practice Questions

1. Question 1

   SIMULATION - Users are unable to access files on their department share located on file server 2. The network administrator has been tasked with validating routing between networks hosting workstation A and file server 2. INSTRUCTIONS - Click on each router to review output, identify any issues, and configure the appropriate solution.If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

2. Question 2

   SIMULATION - A network technician needs to resolve some issues with a customer's SOHO network. The customer reports that some of the devices are not connecting to the network, while others appear to work as intended. INSTRUCTIONS - Troubleshoot all the network components and review the cable test results by clicking on each device and cable. Type help in each terminal to view a list of available commands. Diagnose the appropriate component(s) by identifying any components with a problem and recommend a solution to correct each problem. If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

3. Question 3

   SIMULATION - After a recent power outage, users are reporting performance issues accessing the application servers. Wireless users are also reporting intermittent Internet issues. INSTRUCTIONS - Click on each tab at the top of the screen. Select a widget to view information, then use the drop-down menus to answer the associated questions. If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

4. Question 4

   Which of the following steps of the troubleshooting methodology would most likely include checking through each level of the OSI model after the problem has been identified?
   1. A. Establish a theory.
   2. B. Implement the solution.
   3. C. Create a plan of action.
   4. D. Verify functionality.
   Explanation

   The correct answer is: A. Establish a theory..

   After the problem is identified, the next step is to Establish a theory of probable cause, and walking through each level of the OSI model - from Physical up to Application or top-down - is one of the canonical techniques for systematically generating candidate causes. Implement the solution (B) and Create a plan of action (C) are later steps that depend on a theory and a tested cause. Verify functionality (D) is performed after the solution has been implemented and tested. The OSI walk-through fits the Establish a theory step.

5. Question 5

   While troubleshooting a VoIP handset connection, a technician's laptop is able to successfully connect to network resources using the same port. The technician needs to identify the port on the switch. Which of the following should the technician use to determine the switch and port?
   1. A. LLDP
   2. B. IKE
   3. C. VLAN
   4. D. netstat
   Explanation

   The correct answer is: A. LLDP.

   LLDP (Link Layer Discovery Protocol) is the IEEE 802.1AB neighbor-discovery protocol that lets a connected device learn the switch and port it is plugged into - VoIP phones often consume LLDP-MED to learn the voice VLAN and other parameters; the technician's laptop can run lldpd or a similar tool to read the LLDP advertisement and identify the switch and port. IKE (B) is the Internet Key Exchange protocol used to negotiate IPSec security associations and is unrelated. VLAN (C) is a Layer 2 segmentation construct, not a discovery tool. netstat (D) lists local connections and listening sockets and does not provide neighbor-discovery information. LLDP is the right tool to identify the switch and port.

Other CompTIA Network+ domains

• Network Implementations (136 questions)
• Network Operations (107 questions)
• Network Security (102 questions)
• Networking Fundamentals (152 questions)