Introduction to Networks (Chapter 1)
Chapter 1.1
The Internet, Intranets, and Extranets
How networking technologies are changing the home environment.
How host devices can be used as clients, server or both.
Fundamentals of network models
>>Advantages of computer network
-Networks enable multiple users to share resources (devices and
data)
-Saves money
-Saves time
>>Disadvantages of computer network
-Network hardware, software, and setup costs.
-Hardware and software management and administration costs.
-Data security concerns
Peer-Peer Networks(P2P)
Client/Server Networks
Clients
Server
Workstation
Network Interface Card(NIC)
Network Operating System(NOS)
Host
Node
Connectivity Device
Backbone
Segment
Topology
Protocol
Transmission Media
How LANs and WANs interconnect to the internet
Networks of many sizes
-Small home networks
-Small Office/Home Office networks
-Medium to large networks
-World wide networks
Types of networks:
Local area network(LAN)
Metropolitan Area Network(MAN)
Wireless LAN(WLAN)
Storage Area Network(SAN)
Personal Area Network(PAN)
Wide Area Network(WAN)
The Internet
-Internet is connecting a computer to any other computer anywhere in the world via dedicated routers and servers. When two computers are connected over the Internet, they can send and receive all kind of information such as text, graphics, voice, video, and computer programs.
Different between Extranet and Intranet
Extranet - Shared content accessed by groups through cross-enterprise boundaries.
Intranet - Shared content accessed by members within a single organization.
Four Basic Requirements of a Reliable Network
Fault Tolerence
Scalability
Quality of Service(QoS)
Security
Definition of computer network
A network is a group of computers and other devices (such as printers) that are connected by some type of transmission media.
A network is a set of devices (nodes) connected by media links