Presentation on theme: "ITGS Networks Based on the textbook “Information Technology in a Global Society for the IB Diploma” by Stuart Gray."— Presentation transcript:
1 ITGS NetworksBased on the textbook “Information Technology in a Global Society for the IB Diploma” by Stuart Gray
2 NetworksDue to computer and smart phone growth, networks are becoming increasingly important due to the wireless options.Computer networks exist in many places; small = at home with a few computers; large = companies with thousands of computers.
3 Network Components Clients and servers Shared devices Hubs, routers and switches
4 Network ArchitectureThe way computers are organized on a network and the role each takes.Thin Client Network – computers rely heavily on a server not only for storage but to run software.Peer-to-peer Networks – Every client has equal status and there is no central authority or server.
5 FirewallsHardware or software that determines which data is allowed to enter and leave a network.Personal firewall – when a software firewall in installed on a desktop computer versus a server.IP AddressesDomain NamesProtocols and PortsApplication Program
6 Proxy ServersMiddle step between 2 computers – usually between a computer on a LAN and a web server on the internet.Caching – Process used to speed up activities such as web browsing.
7 Server TypesLocal Area Network (LAN) – confined to 1 geographic area ex: home, school campus; can be wireless LANsPersonal Area Network (PAN) – when mobile devices are connected to a computerMetropolitan Area Network (MAN) – Covers large areas ex: cities or large campuses
8 Server Types continued Wide Area Networks (WAN) – Connecting many computers and LANs together ex: internetStorage Area Networks (SAN) – Dedicated to storing dataVirtual Private Networks (VPN) – Uses encryption over a public network; Virtual LAN (VLAN)
9 Network ConnectionsWired – Fiber optic cables, cable internet access, Dialup, EthernetWireless – Wimax, Wi-Fi, Bluetooth, 3G and 4GNOTE: Network speeds are measured in bits per second.
10 Network Communication MAC Addresses (hardware address) – each is unique.Protocols – Set of rules on how to do something.IP (Internet Protocol) – how devices on the internet are identified and info is routed.TCP (Transmission Control Protocol) – Deals with if data is sent and received.Ports – Identify the services available on networked computers.
11 How are IP Addresses Assigned? All IP Addresses are managed by IANA – the Internet Assigned Numbers Authority.Dynamic – changes each time you connect.Static – remains the same each time you connect.Geolocation – implications for privacy – impossible to maintain anonymity on the Internet.IP Address Future – 243 million are assigned a year – new standard adopted IPv6 (128 bit addresses).
12 The InternetThe Internet Backbone – series of high speed links which connect major geographical areas.Data routing – infrastructure of the Internet.Domain Name System (DNS) – responsible for translating domain names when people type in their web browsers into IP addresses.
13 Internet ProtocolsHypertext Transfer Protocols (HTTP) – governs communication between web servers and web browsers.Hypertext Transfer Protocol Secure (https) – Designed to keep communication secure through encryption.TLSSSL
14 Internet Protocols continued When data is transferred between computers:Asynchronous Transfer – the sender and received are not synchronized in terms of time.Synchronous Transfer – the sender and receiver agree on a transfer rate before the start of a transfer = faster data transfer.
15 Web 2.0Web sites that allow users to contribute information as well as view it.Sometimes called read/write web:Blogs or microblogsWikisSocial bookmarkingSocial networksRSSPodcasts and VodcastsWeb 3.0 – the next evolution – what will it look like?