TOPIC 5: COMMUNICATION AND INTERNET MOHD YUNUS SHARUM (DR.) NORIDAYU MANSHOR (DR.) Faculty of Computer Science and Information Technology Universiti Putra Malaysia
Communication and Internet Describe about computer communication, the network and the technologies used to build the Internet
Digital Communication Communication A process of exchanging information between two components (transmitter to receiver) by a communication channel/medium. Digital communications The process where two or more computers or devices transfer data, instructions, and information between each other.
Computer Network A network is a group of computers and devices connected together via communications devices and transmission media Advantages: Allow fast and reliable communication Allow communication between personals Allow hardware sharing Allow data and information sharing Allow software sharing
Network Types WAN Wide area network (WAN) - network that covers a large geographic area MAN Metropolitan area network (MAN) - connects LANs in a metropolitan area Network types PAN Personal area network (PAN) - connects computers and devices in an individual s or personal environment with wired and wireless technology LAN local area network (LAN) - connects computers and devices in a limited geographical area WLAN Wireless LAN (WLAN) - LAN that uses no physical wires
Network Architecture Network architecture is the configuration of computers, devices, and media on a network Client / server Peer-to-peer
Network Topology A network topology - the layout of the computers and devices in a communications network. Star network Bus network Ring network
Communication Device A communications device is a hardware for transmitting data, instructions, and information allows data transfer between computers on a network broadband modem sends and receives data and information to and from a digital line e.g. DSL modem wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network network card enables a computer or device that does not have built-in networking capability to access a network hub or switch is a device that provides a central point for cables in a network
Internet Internet - a worldwide collection of networks and interconnected computers from various locations Internet service provider (ISP) is an organization that provides access to the Internet - free or for a fee IP address is a unique number sequence to identify computer or device which is connected to the Internet Domain name is a common form that represents the IP address but more readable to human (and to memorize) DNS server a computer that translates the domain name into IP address, and vice versa
World Wide Web The World Wide Web (WWW), or web, deliver the content for the Internet - formed by the collection of web pages from various computers and locations A website - a group of related document (web pages) which contains multimedia items (text, pictures, etc) linked to each other by hyperlinks A web server a dedicated computer that serves the visitors for accessing a website
Internet Search Engine A search engine is an application which is used to search websites, information, multimedia items (e.g. images, video) by keywords as the search query A search query is the keywords or statement related with the search items A subject directory organized a list of web pages into specific categories and sub categories E.g. websites related with cats can be search in the 'animal' category and the subcategory 'cat'