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Chapter 1 1

Communicating over theNetwork

Network Fundamentals ± Chapter 2

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Objectives Describe the structure of a network, including thedevices and media that are necessary for successfulcommunications.

Explain the function of protocols in network

communications.

Explain the advantages of using a layered model todescribe network functionality.

Describe the role of each layer in two recognizednetwork models: The TCP/IP model and the OSImodel.

Describe the importance of addressing and namingschemes in network communications.

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Network Structure D

efine the elements of communication ±3 common elements of communication

message source

the channel

message destination

Define a network

data or information networks capable of carrying many

different types of communications

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Network Structure Describe how messages are communicated

Data is sent across a network in small ³chunks´ calledsegments

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Network Structure Define the components of a network

 ±Network components

hardware

software

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Network Structure End Devices and their Role in the Network

 ±End devices form interface with human network &communications network

 ±Role of end devices:

client

server  both client and server 

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Network Structure Define network media and criteria for making a network

media choice

Network media

this is the channel over which a message travels

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Network Types Define Local Area Networks (LANs)

- A network serving a home, building or campus isconsidered a LocalArea Network (LAN)

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Network Types Define Wide Area Networks (WANs)

- LANs separated by geographic distance are connected bya network known as a Wide Area Network (WAN)

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Network Types Define the Internet

The internet is defined as a global mesh of interconnectednetworks

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Network Types Describe network representations

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Function of Protocol in Network Communication

The importance of protocols and how they are used tofacilitate communication over data networks

A protocol is a set of predetermined rules

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Function of Protocol in Network Communication

Explain network protocols

Network protocols are used

to allow devices to

communicate

successfully

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Function of Protocol in Network

Communication Describe Protocol suites and industry standards

 A standard is

a process or protocol that hasbeen endorsed by thenetworking industry and ratified by a standards

organization

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Function of Protocol in Network

Communication Define different protocols and how they interact

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Function of Protocol in Network

Communication Technology independent Protocols

-Many diverse types of devices can communicate using thesame sets of protocols. This is because protocols specifynetwork functionality, not the underlying technology to

support this functionality.

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Layers with TCP/IP and OSI Model

Explain the benefits of using a layered model ±Benefits include

assists in protocol design

fosters competition

changes in one layer do not affect other layers

provides a common language

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Layers with TCP/IP and OSI Model Define OSI

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Layers with TCP/IP and OSI Model Explain protocol and

reference models

 A protocol model

provides a model thatclosely matches the

structure of a particular protocol suite.

 A reference model

provides a commonreference for maintainingconsistency within alltypes of networkprotocols and services.

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Layers with TCP/IP and OSI Model Compare OSI and TCP/IP model

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Layers with TCP/IP and OSI Model Describe TCP/IP Mode

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Layers with TCP/IP and OSI Model Describe the Communication Process

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Layers with TCP/IP and OSI Model Explain protocol data units (PDU) and encapsulation

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Layers with TCP/IP and OSI Model Describe the process of sending and receiving

messages

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Addressing and Naming Schemes Explain how labels in encapsulation headers are

used to manage communication in data networks

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Addressing and Naming Schemes Describe examples of Ethernet MAC Addresses, IPAddresses, and TCP/UDP Port numbers

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Addressing and Naming Schemes Explain how labels in encapsulation headers are used

to manage communication in data networks

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Addressing and Naming Schemes

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Summary