Understanding Layer 2, 3, and 4 protocols

This chapter excerpt explains the layers of the OSI model, switching, TCP, UDP, and VRRP.

Optimizing Network Performance with Content Switching

Chapter 2: Understanding Layer 2, 3, and 4 Protocols

This book excerpt is from Chapter 2 of "Optimizing Network Performance with Content Switching: Server, Firewall...

and Cache Load Balancing" by Matthew Syme/Philip Goldie, Addison-Wesley Professional, copyright 2004, ISBN 0131014684. This book will publish in July, 2003. All rights reserved. This chapter is posted with permission from Addison-Wesley Professional.

This chapter includes the following sections:

The OSI seven-layer model – What is a layer?

  • The Application Layer (Layer 7)
  • The Presentation Layer (Layer 6)
  • The Session Layer (Layer 5)
  • The Transport Layer (Layer 4)
  • The Network Layer (Layer 3)
  • The Data Link Layer (Layer 2)
  • The Physical Layer (Layer 1)
  • Putting all the layers together


Switching at the different layers

  • Layer 2 switching
  • Layer 3 switching and routing

Understanding Layer 4 protocols
Transport Control Protocol (TCP)

  • The lifecycle of a TCP session
    1. Initiating a session
    2. Data transfer
    3. Terminating a session

User Datagram Protocol (UDP)

  • A simple UDP data flow
    • The request
    • The response

Virtual Router Redundancy Protocol (VRRP)

  • Layer 2 and 3 redundancy
  • The components of VRRP
  • VRRP addressing
  • VRRP operation

Summary

This chapter is posted in full as a pdf file. To continue reading, click here.

Dig Deeper on IP Networking

PRO+

Content

Find more PRO+ content and other member only offers, here.

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

-ADS BY GOOGLE

SearchSDN

SearchEnterpriseWAN

SearchUnifiedCommunications

SearchMobileComputing

SearchDataCenter

SearchITChannel

Close