Understand Network Protocols - ARP and ICMP

Practice Labs Module
Time
40 minutes
Difficulty
Intermediate

The Understand Network Protocols - ARP and ICMP 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: Troubleshooting ICMP related issues, Understand How ARP Works.

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Overview

Introduction

The Understand Network Protocols - ARP and ICMP 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:

  • Troubleshooting ICMP related issues
  • Understand How ARP Works

Exam Objectives

The following exam objectives are covered in this lab:

  • 4.2 Given a scenario, analyze and interpret the output of troubleshooting tools (ICMP, ARP)
  • 4.7 Given a scenario, troubleshoot and resolve common security issues (ICMP)

Exercise 1 - Troubleshooting ICMP Related Issues

ICMP, short for Internet Control Message Protocol, is an essential part of an IP network. Various nodes on the network implement ICMP to send out error messages about issues on the network. These issues include unavailability of a service on the network, or inaccessibility of a node or a device. Some troubleshooting tools and applications, such as ping and traceroute, implement ICMP. ICMP normally does not carry data on the network.

Exercise 2 - Understand How ARP Works

ARP, short for Address Resolution Protocol, translates the IP address of a device to its physical address also known as an Ethernet address/MAC address. It is one of the main components of the TCP/IP protocol suite. Misconfigured ARP can lead to random connectivity issues across the network. You can analyse the ARP cache to troubleshoot and resolve issues including address conflict or IP address duplication on a network.

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