Transcript
Dr Md Kabirul Islam
• Introduction to computer networks and networking concepts,
• general understanding and examples,• brainstorming, group work and
presentation, • simple switching network, • overview of the whole syllabus and • relation between different networking
concepts and essentials
Objectives:To be acquainted with: The Concept of Networking Requirements for networking Advantages and Importance Disadvantages
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A computer network, or simply a network, is a collection of computers and other hardware components interconnected by communication channels that allow sharing of resources and information, where at least one process in one device is able to send/receive data to/from at least one process residing in a remote device, then the two devices are said to be in a network.
• Sharing of devices (printers & scanners)• Sharing of program/software• Sharing of files• Sharing of data• Sharing information• Sharing of single high speed internet connection• Can access server centered database• Better communication using internet services
such as email, mailing list & internet relate chat (IRC)
Connectivity and Communication Data Sharing Hardware Sharing Internet Access Internet Access Sharing Data Security and Management Performance Enhancement and Balancing Entertainment
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Network Hardware, Software and Setup Costs
Hardware and Software Management and Administration Costs
Undesirable Sharing Illegal or Undesirable Behavior Data Security Concerns
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Metropolitan Area Network(MAN)
Local Area Network (LAN)
Wide Area Network (WAN)
• A network of computers that are in the same physical location, such as home or building
• Usually connected using Ethernet
Some characteristics
smallest network. single building, home, school. simplest form of LAN is to connect two
computers together. less than 500 interconnected devices. inexpensive hardware: twisted pair,
coaxial cable, fiber optic or wireless. faster than MAN and WAN.
Wi-Fi (Wireless Fidelity) A wireless technology that connects computers
without cables Access Point (AP)
A device (base station) that connects wireless devices together
Usually connected to a wired-network ESSID (Extended Service Set ID)
A “name” for the AP, eg. mobilenet Hotspot
The area covered by wireless access points
X
The network that connects several LANs in a city area through communication devices
For example, Dhaka, Kuala Lumpur, Manila, Singapore, Tokyo, London and New York.
Large physical area : city Example: Bank, Financial organization MAN used fiber optic. High speed network (not fast as LAN).
A router is a special-purpose system dedicated to the task of interconnecting networks. A router can interconnect networks that use different technologies, including different media, physical addressing schemes, or frame formats
Largest network in the world Cover large distances such as states,
countries or continents. WAN is group of MANs and LANs Use Router to connect between
networks. WAN use fiber optic, speed 20-2000kbps
(slower than LAN and MAN).