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ITGS Networks and Components: Servers, Clients, and Network Devices

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  1. ITGS Networks

  2. ITGS • Networks and components • Server computers normally have a higher specification than regular desktop computers because they must deal with many client requests at once • Feature multiple processors and extra RAM • Multiple hard disks offering several terabytes of storage • Arranged as a RAID array • Redundant Array of Independent Disks - failover system for hard disks in which multiple hard disks are connected together • the info from one hard disk is mirrored onto another one every time something is saved, so that if a hard disk fails, the computer switches to its mirror

  3. ITGS • Client computers • Regular desktops, laptops or mobile computers that connect to a network to use its services • When connecting to a network, clients have to authenticate themselves

  4. ITGS File servers - store users files and data and controls access to them Application servers - store software programs which can be delivered to client computers Print servers - manage printers attached to the network, controllng access to them and maintaining a queue of documents waiting to be printed. • Network components • Clients and servers • Client-server networks

  5. ITGS Database servers - hosts large databases of information and manages access to it Authentication servers, or domain controllers - .responsible for processing login requests and determining whether a user should be allowed access to the network

  6. ITGS • Firewall • If a network is connected to the internet, a server will be dedicated to managing the security of info coming in and out of the network

  7. ITGS • Sharing devices • Saves money (as in printer sharing), because only one printer must be purchased for the network • How shared devices connect • Shared devices may connect directly to a network hub or switch using an ethernet or USB connection • Or they can be directly connected to a computer, either client or server

  8. ITGS • Hubs, routers and switches • Hubs, routers and switches all perform a similar basic task, but the way in which they operate is different • Include a number of Ethernet ports, allowing multiple computers to connect to them on a LAN, or Local Area Network • Hubs • When a hub receives data, it simply rebroadcasts it to every connected device, including the one that sent it in the first place

  9. ITGS • When hubs send data to every computer connected to them, a lot of bandwidth is wasted • Switches save bandwidth by routing data only to the intended computer, not all of them. • Switches • Inspect the data they receive to determine the destination, then forwarded only to the intended recipient

  10. ITGS • Routers connect two or more separate networks, acting as a gateway through which all data entering and leaving the network passes. • A router can also filter the info that passes through it, only allowing access to certain computers. • Example: • A switch connects all of the computers in the Journalism Rooms (LAN) • A router connects the school network with another network, such as the district

  11. ITGS • Broadband routers • Often supplied by Internet Service Providers (ISPs)when installing Internet access in a business or home • Allows you to connect your home computer to the Internet and connect multiple computers to form a home network

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