Basic concepts of computer Networking

Basic concepts of computer Networking

Project Type: Presentation (ppt)

Downloads: 10 - 50 Saturday 18th March 2017 Report

Basic concepts of computer Networking - Overview

------------ PAGE 1 ------------ Company LOGO Basic Concepts of Computer Networks and Communications Network Topology Presented by- Hassan Jan Habib „X BS ( 1 st Semester ) ------------ PAGE 2 ------------ Presentation Contents „X Definition of Computer Networks „X Different Network Methods „X LAN „X Network Topologies „X Summary ------------ PAGE 3 ------------ Definition: „X Computer networking is the engineering decipline concerned with the communication between computer systems or devices. „X A computer network is any set of computers or devices connected to each other with the ability to exchange data. Computer Networks ------------ PAGE 4 ------------ Different Network Methods are: „X Local area network ( LAN), „X Metropolitan area network ( MAN) „X Wide area network ( WAN) „X Wireless LANs and WANs Different Network Methods ------------ PAGE 5 ------------ Local Area Network( LAN), „X which is usually a small network constrained to a small geographic area. An example of a LAN would be a computer network within a building. Local Area Network ( LAN) ------------ PAGE 6 ------------ DEFINITION What is a Topology ? The physical topology of a network refers to the configuration of cables, computers and other peripherals. ------------ PAGE 7 ------------ TYPES OF NETWORK TOPOLOGY Three commonly used network topologies are:- Bus Topology Ring Topology Star Topology ------------ PAGE 8 ------------ BUS TOPOLOGY All computers and devices connected to central cable or bus. Consists of a main run of cable with a terminator at each end. Popular on LANs because they are inexpensive and easy to install. ------------ PAGE 9 ------------ BUS TOPOLOGY ------------ PAGE 10 ------------ RING TOPOLOGY Cable forms closed ring or loop, with all computers and devices arranged along ring. Data travels from device to device around entire ring, in one direction. Primarily is used for LANs, but also is used in WANs. ------------ PAGE 11 ------------ RING TOPOLOGY ------------ PAGE 12 ------------ STAR TOPOLOGY All devices connect to a central device, called hub. All data transferred from one computer to another passes through hub. ------------ PAGE 13 ------------ STAR TOPOLOGY ------------ PAGE 14 ------------ STAR TOPOLOGY ------------ PAGE 15 ------------ „X In the mesh topology each computer are connected with each other by separate cable. Create point to point connection to every device on network. If one cable fail data always has alternative path to get to its destination. „X On a large scale, you can connect multiple LANs using mesh topology with leased line. „X This type topology generally use in military area. MESH TOPOLOGY ------------ PAGE 16 ------------ DIFFERENTIATION BETWEEN THE THREE TYPES OF NETWORK TOPOLOGY WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF THE THREE OF NETWORK TOPOLOGY? ------------ PAGE 17 ------------ SUMMARY BUS TOPOLOGY DEFINITION • All computers and devices connected to central cable ADVANTAGE • Easy to connect a computer or peripheral to a linear bus. • Requires less cable length than a star topology. DISADVANTAGE • Entire network shuts down if there is a break in the main cable. • Terminators are required at both ends of the backbone cable. • Difficult to identify the problem if the entire network shuts down. ------------ PAGE 18 ------------ SUMMARY RING TOPOLOGY DEFINITION • Cable forms closed ring or loop, with all computers and devices arranged along ring. ADVANTAGE • Data is quickly transferred without a ‘ bottle neck’. • The transmission of data is relatively simple as packets travel in one direction only. DISADVANTAGE • Data packets must pass through every computer between the sender and recipient therefore, this makes it slower. • If any of the nodes fail then the ring is broken and data cannot be transmitted successfully. • It is difficult to troubleshoot the ring. ------------ PAGE 19 ------------ SUMMARY DEFINITION • All devices connect to a central device, called hub. ADVANTAGE • Easy to install and wire. • Security can be implemented in the hub/ switch. DISADVANTAGE • Requires more cable length than a linear topology. If the hub or concentrator fails, nodes attached are disabled. More expensive than linear bus topologies because of the cost of the concentrators. STAR TOPOLOGY • Easy to detect faults and to remove parts ------------ PAGE 20 ------------ 1. Provide redundant path between device. SUMMARY DEFINITION • In the mesh topology each computer are connected with each other by separate cable. . ADVANTAGE • 1. Provide redundant path between device. . The network can be expanded without disruption to current user. . DISADVANTAGE Require more cable then other topology . Complicated implementations. MESH TOPOLOGY ------------ PAGE 21 ------------ TOPOLOGY
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