CCNA Data Center DCICN 640-911 Official Cert Guide

Chapter 1. The TCP/IP and OSI Networking Models

This chapter covers the following exam topics:

1.1 Describe the purpose and functions of various network devices

1.1.a Interpret a network diagram

1.4 Describe the purpose and basic operation of the protocols in the OSI and TCP models

1.4.a TCP/IP

1.4.b OSI layers

This chapter begins Part I, which focuses on the basics of networking. Because networks require all the devices to follow the rules, this part starts with a discussion of networking models, which gives you a big-picture view of the networking rules.

You can think of a networking model as you think of a set of architectural plans for building a house. A lot of different people work on building your house, such as framers, electricians, ...