Lesson 9Networking

Core Hardware Fundamentals

Objectives

Explain network communications concepts, includingfull- and half-duplex, network cabling, access protocols and network protocols.

List and describe commonly used network cable types.

Identify the appropriate use of network cable types.

Identify common network topologies.

Install a network adapter.

Describe methods for improving network bandwidth and availability.

LANs and WANs

Local Area Network

Wide Area Network

Network Security Models

Workgroup

Client/server

Domain-based

Directory-based

OSI Model

Network Communications

Send data

Send data

Send data

Send data

Message

Response

Full-Duplex

Half-Duplex

Communication Requirements

Communication path

Common access protocol

Common communication protocol

Media Types

Wire (bounded) Media

Thick coaxial cable

Thin coaxial cable

Shield twisted-pair (STP)

Unshielded twisted-pair (UTP)

Fiber optic

Wireless (unbounded) Media

Broadcast frequency

Infrared line-of-site

Terrestrial microwave

Satellite communication

Cable Types

Coax type Use Impedance

RG-8 Thick ethernet 50 Ohms

RG-11 Broadband LAN 75 Ohms

RG-58 Thin ethernet 50 Ohms

RG-59 Television 75 Ohms

RG-62 ARCnet 93 Ohms

Twisted pair type Use Bandwidth

Category 1 Voice and data transfer 1 Mbps

Category 2 Data 4 Mbps

Category 3 Data 10 Mbps

Category 4 Data 20 Mbps

Category 5 Data 100 Mbps

Common Topologies

Bus

Ring

Star

Ethernet Standards

10Base2 10 Mbps coaxial thin ethernet

10Base5 10 Mbps coaxial thick ethernet

10BaseT 10 Mbps twisted pair

100BaseT 100 Mbps twisted pair

10BaseFL 100 Mbps fiber optic

IBM Cable Types

Cable Type Gauge Description

Type 1 22STP suitable for 4-Mbps and 16-Mbps token ring

Type 2 22STP suitable for telephone and RS-232 data. Not recommended for4-Mbps or 16-Mbps token ring

Type 3 24UTP suitable for telephone and 4-Mbps token ring

Type 6 26STP suitable for patch panel and network adapter cable

Network Adapter Connection

PCMCIA Network Adapter

Communication Protocols

Transmission Control Protocol/Internet Protocol (TCP/IP)

NetBIOS Extended user Interface (NetBEUI)

Internet Packet Exchange/Sequenced Packet Exchange (IPX/SPX)

Data Link Control (DLC)

AppleTalk