CCNA Intro

Introduction To Network

OverviewWhats Network ?Types of NetworksOpen System Interconnection Reference Model (OSI / RM)Transmission Control Protocol / Internet Protocol (TCP/IP)Network DevicesNetwork TopologyCabling LAN

Whats Network ?Network is a group of computers connected with others to share data.

Types of NetworkLocal Area Network (LAN) is a group of computers connected with others across limited geographic area.Wide Area Network (WAN) is a group of computers connected with others across large geographic area. Metropolitan Area network (MAN) is a network that spans a metropolitan area such as a city.Storage Area network (SAN) is a dedicated, high-performance network used to move data between servers and storage resources. Virtual Private Network (VPN) is a private network that is constructed within a public network infrastructure such as the Internet. Intranets and Extranets.

OSI Reference ModelCharacteristics of OSI/RMIt contains seven layers.Each layer has a specific function.Each layer communicates with its own upper and lower layer.Each layer has some network devices operate on it.Each layer has some network protocols operate on it.Benefits of the OSI ModelDefines the process for connecting two layers. Separates a complex function into simpler components.Accelerates evolution.

OSI Reference Model

OSI Reference Model

OSI Reference ModelData Encapsulation means data wrapped with protocol information at each layer of the OSI model.To communicate and exchange information, each layer uses Protocol Data Units (PDUs).

OSI and TCP/IP

OSI Reference Model

Network TopologyNetwork topology defines the structure of the network.Logical topology defines how the media is accessed by the hosts for sending data. Physical topology is the actual layout of the wire or media.

Network MediaCopper Media

Optical Media

Wireless Media

Copper Media

Copper MediaCoaxial cable support Ethernet (10 Mbps) and FastEthernet (100 Mbps) there are two types of coaxial cable.Thicknet: maximum length 500 m.Thinnet: maximum length 185 m.

Copper MediaTwisted Pair cable

Copper MediaTwisted Pair cable

Copper MediaTwisted Pair cable

Ethernet CablingThe types of Ethernet cables available are: Straight-through cable

Crossover cable

Rolled cable

Straight-through cableThe straight-through cable is used to connect Host Switch Host Hub Router Switch Router Hub

Rolled CableIt isnt used to connect any Ethernet connections together.It uses only for making a configuration for routers or switches.