The Troubleshoot Common Operating System Problems Part 2 module provides you with the instruction and computer hardware to develop your hands on skills in the defined topics. This module includes the following exercises:

  • Troubleshoot Internet Connectivity Issues
  • Troubleshoot Network Connectivity due to DNS settings
  • Troubleshoot Network Connectivity due to NetBIOS settings

Exercise 1 - Troubleshoot Internet Connectivity Issues

A wide area network (WAN) connects computers across distributed geographical locations. WAN enables people to communicate, share data and information across cities and nations. The global Internet is the good example of a WAN spanning the world.

WAN connections might experience connectivity issues due to various reasons which most of the time is beyond our control. This can be caused by physical connection problems like a fibre optic cable break due to natural calamities; unavailability of Domain Name System (DNS) servers that resolve top level domain names and network connection problems at your Internet service provider.

In this exercise to understand common network problems, you will perform the following tasks: You will make changes on the IP network settings and view the proxy server settings

Exercise 2 - Troubleshoot Network Connectivity due to DNS Settings

DNS, short for Domain Name System, resolves domain names and hostnames into numeric IP addresses on a TCP/IP network. Although DNS is largely associated with the Internet, DNS can also be used on a private network.

DNS is essential in TCP/IP because domains and hosts (devices) are named using normal language words, making it easier for users to remember and find computers on a TCP/IP network, while the computers and other devices identify and communicate with each other using numeric IP addresses.

Exercise 3 - Troubleshoot Network Connectivity due to NetBIOS Settings

Network Basic Input Output System or NetBIOS is a software interface that allows computers to communicate in a local area network. This is also used as a naming convention for computers in Windows networking where you refer to computers using its computer name without the domain name to which it is a member of.

Windows operating systems use NetBIOS combined with TCP/IP known as NetBT to cover the complexities of TCP/IP and provide compatibility with various applications that support NetBIOS.

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