![]() #What are internet search tools fullLow cost Simple to configure User has full accessibility of the computer Disadvantages of peer-to-peer networks: May have duplication in resources Difficult to uphold security policy Difficult to handle uneven loading Where peer-to-peer network is appropriate: 10 or less users No specialized services required Security is not an issue Only limited growth in the foreseeable future Information Technology Centerġ1 Clients and Servers Network Clients (Workstation) Network ServersĬomputers that request network resources or services Network Servers Computers that manage and provide network resources and services to clients Usually have more processing power, memory and hard disk space than clients Run Network Operating System that can manage not only data, but also users, groups, security, and applications on the network Servers often have a more stringent requirement on its performance and reliability Information Technology Centerįacilitate resource sharing – centrally administrate and control Facilitate system backup and improve fault tolerance Enhance security – only administrator can have access to Server Support more users – difficult to achieve with peer-to-peer networks Disadvantages of client/server networks High cost for Servers Need expert to configure the network Introduce a single point of failure to the system Information Technology Centerġ3 Topology ― 3 basic types How so many computers are connected together?īus Topology Ring Topology Star Topology Hub Information Technology Centerġ4 A single cable called a trunk (backbone, segment)īus Topology Simple and low-cost A single cable called a trunk (backbone, segment) Only one computer can send messages at a time Passive topology - computer only listen for, not regenerate data Star Topology Each computer has a cable connected to a single point More cabling, hence higher cost All signals transmission through the hub if down, entire network down Depending on the intelligence of hub, two or more computers may send message at the same time Information Technology Centerġ5 Ring Topology Every computer serves as a repeater to boost signals Peer-to-peer network is also called workgroup No hierarchy among computers all are equal No administrator responsible for the network Peer-to-peer Information Technology Center Towns, states, countries Examples: Network of our Campus Internet Your home USA WAN IT Centre Information Technology Center of computers and distance covered Usually one kind of technology throughout the LAN Serve a department within an organization Examples: Network inside the Student Computer lab Network inside a small office Network inside your home Information Technology CenterĪ network that uses long-range telecommunication links to connect 2 or more LANs/computers housed in different places far apart. radio, microwave, infrared, sound Information Technology Centerħ LAN and WAN Local Area Network (LAN) Small network, short distanceĪ room, a floor, a building Limited by no. Twisted-Pair cables: Unshielded Twisted-Pair (UTP) cables Shielded Twisted-Pair (STP) cables Coaxial cables Fiber-optic cables Unguided ― wireless transmission, e.g. ![]() Internet-based, so everyone can access the same administrative or support application from their PCs Information Technology Centerĭepending on one’s perspective, we can classify networks in different ways Based on transmission media: Wired (UTP, coaxial cables, fiber-optic cables) and Wireless Based on network size: LAN and WAN (and MAN) Based on management method: Peer-to-peer and Client/Server Based on topology (connectivity): Bus, Star, Ring … Information Technology CenterĦ Transmission Media Two main categories: Guided ― wires, cables print document Centralize administration and support E.g. data communicationĭo you prefer these? Or this? Information Technology CenterĮ.g. Information Technology Centerģ Why Networking? Sharing information - i.e. 2 Computer Networks Two or more computers or communications devices connected by transmission media and channels and guided by a set of rules for communication purposes that allow users to communicate with each other and share applications and data.
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