The Troubleshooting Internet Connection and DNS Settings 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

Exam Objectives

The following exam objectives are covered in this lab:

  • 3.2 Compare and contrast common network vulnerabilities and threats (Attacks/threats, Denial of service, DNS, ARP cache poisoning, ARP issues, Spoofing)
  • 4.8 Given a scenario, troubleshoot and resolve common WAN issues (Loss of internet connectivity, Interface errors, DNS issues)

Exercise 1 - Troubleshoot Internet connectivity issues

A wide area network (WAN) connects computers across distributed geographical locations. This means WAN enables people to communicate and share data and information across cities, states, or even nations. Internet is the prime example of a WAN. WAN connections might experience connectivity issues due to various reasons.

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 find computers on a TCP/IP network, while the computers and other devices identify and communicate with each other using numeric IP addresses.

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