Unit 1 - Hardware

7/30/2019 Unit 1 - Hardware

1/27

SFC 2053

BASIC NETWORKING

Introduction to Computer Networking - Hardware


2/27

Computer Networking Device Computer networking devices are units that mediate data in

a computer network.

Computer networking devices are also called network

,

(IWU).

Units which are the last receiver or generate data are

called hosts or data terminal equipment.


3/27

Router

A specialized network device that determines the

next network point to which it can forward a datapacket towards the destination of the packet.

Unlike a gateway, it cannot interface different

protocols.

Works on OSI layer 3


4/27

Router


5/27

Bridge:

A device that connects multiple network

segments along the data link layer.


6/27

Switch:

A device that allocates traffic from one network

segment to certain lines which connect the segmentto another network segment.

Unlike a hub, a switch splits the network traffic and

sends it to different destinations.

Works on OSI layer 2.


7/27

Switch:


8/27

Hub: Connects multiple Ethernet segments together.

A hub does not examine or manage any of the trafficthat comes through it: any packet entering any port isrebroadcast on all other orts.

Packet collisions are more frequent in networksconnected using hubs than in networks connected usingSwitches.



9/27

Repeater:

A device used to amplify or regenerate digital

signals received while sending them from one partof a network into another.



10/27

Repeater:


11/27

Firewall:

A piece of

hardware orsoftware put on

the network to

prevent somecommunications

forbidden by the

network policy


12/27

Firewall:


13/27

Modem:

A device that modulates an analog "carrier" signal

, ,

that also demodulates such a carrier signal to

decode the transmitted information, as a computer

communicating with another computer over the

telephone network


14/27

Modem:


15/27

Modem:


16/27

Modem:


17/27

Wireless AccessPoint (WAP)

A device that allows wireless devices to connect to a

wired network using Wi-Fi, Bluetooth or relatedstandards.

The WAP usually connects to a router (via a wirednetwork), and can relay data between the wirelessdevices (such as computers or printers) and wireddevices on the network.



18/27

Wireless AccessPoint (WAP)


19/27

Network Interface Controller

A network interface controller (also known as a network interface

card, network adapter, LAN adapter and by similar terms) is

a computer hardware component that connects a computer to

a computer network.

Whereas network interface controllers were commonly implementedon expansion cards that plug into a computer bus, the low cost and

ubiquity of the Ethernet standard means that most newer computers

have a network interface built into the motherboard

Wireless NIC adapters are also available.

Works on both OSI Layer 1 and 2


20/27

Network Interface Controller


21/27

Server

A server is a computer program running to serve the requests of

other programs, the "clients".

In most common use, server is a physical computer dedicated to

running one or more such services (as a host), to serve the needs of

users of the other computers on the network.

Depending on the computing service that it offers it could be

a database server, file server, mail server, print server, web server,

or some other kind of server.

Servers often provide essential services across a network, either to

private users inside a large organization or to public users viathe Internet


22/27

Server


23/27

Server


24/27


25/27


26/27


27/27

Unit 1 - Hardware

Documents

Transcript of Unit 1 - Hardware