Lecture Networking essentials plus (3 e) Chapter 6 Defining network protocols

Lecture Networking essentials plus (3 e) Chapter 6 Defining network protocols. The main contents of the chapter consist of the following Introduction to protocols, TCP IP, netware protocols, other common protocols.

Defining Network Protocols

 Introduction to Protocols

 TCP/IP

 NetWare Protocols

 Other Common Protocols

Introduction to Protocols

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 Function of Protocols

 Protocols in a Layered Architecture

 Implementing and Removing Protocols

How Protocols Work

Sender Protocols:

 Break data into packets

 Add addressing information

 Prepare data for transmission through the NIC and out onto the network cable

Receiver Protocols:

 Take data packets off the cable

 Bring data packets into the computer through the NIC

 Strip data packets of transmitting information added by sender

 Copy data packets to a buffer

The OSI Model

4

Layers of Protocols

Standard Stacks

Most important models include:

 ISO/OSI protocol suite

 IBM Systems Network Architecture (SNA)

 Digital DECnet

 Novell NetWare

 AppleTalk

Communication Tasks

6

OSI Model

Manufacturer Compatibility

MAC Driver or NIC Driver

8

 Introduction to TCP/IP

 TCP/IP Standards

 TCP/IP and OSI

Protocols Written

Specifically for TCP/IP

 SMTP (Simple Mail Transfer Protocol) Email

 FTP (File Transfer Protocol) Exchanging Files

 SNMP (Simple Network Management Protocol)

Network Management

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TCP/IP and OSI

Four Layers of TCP/IP:

 Network Interface Layer

 Internet Layer

 Transport Layer

 Application Layer

Transmission Control

Protocol (TCP/IP)

12

Three-Way Handshake:

 Requestor sends a packet specifying the port number and its initial sequence number (ISN) to server

 Server acknowledges with its ISN, which consists of the requestor’s ISN, plus 1

 The requester replies with the server’s ISN, plus 1

NetWare Protocols

 Introduction to NetWare Protocols

 Medium-Access Protocols

 Internetwork Packet Exchange and Sequenced Packet Exchange (IPX/SPX)

 Service Advertising Protocol (SAP)

 NetWare Core Protocol (NCP)

Comparing NetWare and

OSI Reference Models

14

Routing Information

Protocol (RIP)

RIP packets allow:

 Workstations to locate fastest route to a network

number

 Routers to request routing information to update

their own tables

 Routers to respond to route requests

 Routers to ensure that all other routers are aware of internetwork configurations

Other Common Protocols

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 NetBIOS

 NetBEUI

 X.25 Packet Switching

 AppleTalk

 OSI Protocol Suite

 DECnet

Network Basic Input/Output

System (NetBIOS)

Four primary functions:

 Name Resolution

 Datagram Service

 Session Service

 NIC/Session Status

AppleTalk Network

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