Overview

Introduction

The Understand Common Ports and Protocols 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:

  • Verifying Port 80 for HTTP
  • Verifying Port 443 for HTTPS
  • Verify Port 139 for NetBIOS
  • Understanding TCP and UDP

Lab time: It will take approximately 1 hour to complete this lab.

Exercise 1 - Verifying Port 80 for HTTP

HTTP, short for Hypertext Transfer Protocol, enables the users of the World Wide Web to exchange data. HTTP supports a huge variety of data formats - from text to voice to all way through to multi-media. HTTP servers typically listen on TCP port 80 for any session requests from HTTP clients.

In this exercise you will complete the following tasks:

  • Start Packet Capture
  • Create HTTP Traffic
  • Verify Port 80 for HTTP

Exercise 2 - Verifying HTTPS Port 443

HTTPS, short for Hypertext Transfer Protocol Secure, is essentially HTTP with SSL/TLS added for security. The security feature helps prevent unauthorized access of information available on a network. This is especially relevant to networks accessed over WANs, such as Internet. TCP reserves port #443 for the HTTPS protocol.

In this exercise you will complete the following tasks:

  • Restart Wireshark on PLABGW01
  • Capture HTTPS Traffic using Wireshark
  • Block-out HTTPS Access
  • Verify HTTPs is Blocked
  • Remove Firewall Rules Blocking HTTPS

Exercise 3 - Verifying Port 139 for NetBIOS

NetBIOS, short for Network Basic Input/Output System, is a communication protocol that supports communication among computers connected on LAN. NetBIOS does not support communication on WANs. Therefore, NetBIOS normally rides on TCP/IP when implemented on applications/computers connected to a WAN. Port #139 is reserved for NetBIOS protocol.

In this exercise you will complete the following tasks:

  • Verify NetBIOS is Running
  • Block NetBIOS
  • Verify NetBIOS is Disabled
  • Enable NetBIOS
  • Verify Port 139 is Reopened

Exercise 4 - Contrast TCP and UDP Protocols

Both TCP (transmission control protocol) and UDP (user datagram protocol) are a part of the IP (Internet protocol) suite of protocols. Both these protocols convert data into packets to enable exchange across networked computers. However, the two are very dissimilar in their details of operation; and hence have very different application.

To better understand this technology, refer also to your course material or use your preferred search engine to research this topic in detail.

In this exercise you will complete the following tasks:

  • Capture Packets
  • Identify TCP Packets
  • Identify UDP Packets

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