Live Virtual Machine Lab 11.2: Module 11 Troubleshooting Common Networking Issues

You have configured a new web server in your network, which will be used only from the local network. You published the website on TCP port 8443 but are unable to access the website on that port from a client device. You are able to ping the server IP address and also have access to the server using a Remote Desktop Connection. What could be the cause of this issue?

A: Windows firewall is enabled, and port 8443 is not allowing traffic Explanation: If you are experiencing issues with applications running on a specific port and everything else related to that server is working, it is usually caused by a firewall running on that server.

You have implemented your network with new managed switches. A user is experiencing periodical interruptions on the network. While pinging the main server, you notice that there is periodical packet loss. What could cause this problem?

A: Broadcast storm Explanation: One of the common causes of packet loss is referred to as link congestion. Think of rush hour traffic when there are too many cars on the road, and no one can get anywhere or when a four-lane highway in a high-volume area merge down to two lanes. A very similar situation happens when more packets are arriving at a link than it was designed to handle.

You work as a network administrator in an organization. The company has three locations. A user is unable to access a shared folder located on a desktop in another location. You try to ping the IP address of the desktop, but it fails. You are unable to ping any IP address from that subnet. What is the next step you should perform on your router?

A: Check the IP routing table Explanation: If you are unable to ping host B, located in a different location from host A, it means that the routing is not working correctly. You will first need to check the IP routing table on the router that connects the two locations.

You have two users who work on the same floor and belong to the same department. The organization has strict rules implemented for printer access. One of the users is unable to access the printer but has access to the Internet. What should you check on your switch?

A: VLAN assignment Explanation: If a user can access everything but the resources, it means that the user has a working network, but his system could be placed in the wrong VLAN on the switch. You will need to first verify the VLAN assignment of the port to which the user's computer is connected.

You have a complex network environment and have issues related to the routing of network traffic between hosts. Which of the following command will you use to troubleshoot this issue and verify how the packets are routed?

A: traceroute Explanation: Traceroute is a very useful command to troubleshoot routing issues and verify the path between two connections. The traceroute command will give you the IP address of every host that the packets traverse across.