NETWORKINGNETWORKING

OBJECTIVES

• Identify network topologies

• Identify hardware components of a network

WHAT IS A NETWORK?

• Productive way to utilize a group of computers

• Two or more computers linked together– Share resources– Security– Communication

NETWORK COMPONENTS

• Cables

• Adapter Cards

• Servers

• Workstations

• Printers

• Modems

NETWORK TOPOLOGIES

• MESH

• BUS

• RING

• STAR

NETWORK TOPOLOGIESNETWORK TOPOLOGIESMesh NetworkMesh Network

A pure mesh network has point-to-point links (a direct connection between two devices) between every node in the network.

NETWORK TOPOLOGIESBus Network

A bus topology is a linear transmission medium terminated at both ends. All nodes attach directly to this medium via relatively short links.

NETWORK TOPOLOGIESRing Network

The ring topology consists of a closed loop of directly linked devices between repeaters.

NETWORK TOPOLOGIESStar Network

HUB• In a star network, each

device connects to a central point called a hub or concentrator.

• Information sent from a device always goes to the hub first and then is routed appropriately.

NETWORK TOPOLOGIESHybrid Network

• Hybrids use multiple topologies

• Wide Area Networks (WAN) often use direct links to connect remote rings or stars

NETWORK TOPOLOGIESNETWORK TOPOLOGIESHybrid NetworkHybrid Network

LAN D

LAN C

LAN B

File Server

NETWORK TOPOLOGIESNETWORK TOPOLOGIESMesh NetworkMesh Network

ApplicationPresentationSession

Data LinkPhysical

NetworkTransport

7654321

NETWORK STANDARDS MODELNETWORK STANDARDS MODELOpen Systems Interconnection - OSI by ISOOpen Systems Interconnection - OSI by ISO

InternationalStandardsOrganization

To promoteMulti-VendorInter-operability

OSI Model – Memorizing Tip

• All

• People

• Seem

• To

• Need

• Data

• Processing