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Internet
- 2. INTERNET The internet isa globally connected network system that uses TCP/IP to transmit data via various types of media. The internet is a network of global exchanges – including private, public, business, academic and government networks – connected by guided, wireless and fiber-optic technologies. The terms internet and World Wide Web are often used interchangeably, but they are not exactly the same thing; the internet refers to the global communication system, including hardware and infrastructure, while the web is one of the services communicated over the internet.
- 3. ARCHITECTURE OF INTERNET TheInternet architecture is based on a simple idea: ask all networks want to be part of carrying a single packet type, a specific format the IP protocol. In addition, this IP packet must carry an address defined with sufficient generality in order to identify each computer and terminals scattered throughout the world. The user who wishes to make on this internetwork must store its data in IP packets that are delivered to the first network to cross. This first network encapsulates the IP packet in its own packet structure, the package A, which circulates in this form until an exit door, where it is
- 4. ADVANTAGES OF INTERNET • Information,knowledge, and learning • Connectivity, communication, and sharing • Address, mapping, and contact information • Banking, bills, and shopping • Selling and making money • Collaboration, work from home, and access to a global workforce • Entertainment • Internet of Things
- 5. DISADVANTAGES OF INTERNET• Thereis a lot of wrong information on the internet. Anyone can post anything, and much of it is garbage. • There are predators that hang out on the internet waiting to get unsuspecting people in dangerous situations. • Some people are getting addicted to the internet and thus causing problems with their interactions of friends and loved ones. • Easy to waste a lot of time on the internet. You can start surfing, and then realize far more time has passed than you realized. Internet has a lot of “cheater” sites. People can buy essays and pass them off as their own far more easily than they used to be able to do. • Hackers can create viruses that can get into your personal computer and ruin valuable data. Hackers can use the internet for identity theft. • It can be quite depressing to be on the internet and realize just how uneducated so
- 6. INTRANET An intranet isa secure and private enterprise network that shares data o application resources via Internet Protocol (IP). An Intranet differs from the internet, which is a public network. Intranet, which refers to an enterprise’s internal website or partial IT infrastructure, may host more than one private website and is a critical component for internal communication and collaboration. A company's intranet is based on Internet concepts and technology, but for private use. The term can refer to anything that is web- based but for private use, but typically means a company's shared web applications. For example, it is common for companies to store internal contact information, calendars, etc. on their intranet.
- 7. ADVANTAGES OF INTRANET• Intranetsoffering workforce productivity which can help user to find and observe information very fast. • Intranet permits business companies to share out information to employees according to their need or requirements. • The best advantage offered by intranet is communications within an organization or business company. • Intranets are helpful to converse planned initiative that has an international reach all through the organization. • Through Intranet common corporate culture every user can view the similar information. • Intranet offer improve teamwork through which teamwork is enabled and all
- 8. DISADVANTAGES OF INTRANET • Managementdoes need to stop control of specific information, this problem can be minimized but with appropriate prudence. • The other disadvantage of Intranet is security issue • Intranet gathered everything in one location which is really good but if it is not prearranged then you will spoil everything. • The cost of intranet is very high but has lots of advantages after implementing.
- 9. EXTRANET An extranet isa controlled private network allowing customers, partners, vendors, suppliers and other businesses to gain information, typically about a specific company or educational institution, and do so without granting access to the organization's entire network. An extranet is often a private part of a website. It is restricted to select users through user IDs, passwords and other authentication mechanisms on a login page. An extranet may be viewed as an intranet mapped onto the public Internet or onto some other private network.
- 10. ADVANTAGES OF EXTRANET • Theability to exchange large volumes of data using electronic data interchange. • Sharing product data or catalogues with business partners. • Joint company collaboration and training. • Sharing services such as online banking applications among affiliated banks.
- 11. DISADVANTAGES OF EXTRANET • Disadvantagesare expensive implementation and maintenance if hosted internally and the potential for compromised sensitive or proprietary information. • Alternately, it may be hosted by an application service provider.
- 12. PROTOCOLS Internet Protocol (IP)is the principal set (or communications protocol) of digital message formats and rules for exchanging messages between computers across a single network or a series of interconnected networks, using the Internet Protocol Suite (often referred to as TCP/IP). Messages are exchanged as datagrams, also known as data packets or just packets. IP is the primary protocol in the Internet Layer of the Internet Protocol Suite, which is a set of communications protocols consisting of four abstraction layers: link layer (lowest), Internet layer, transport layer and application layer (highest). The main purpose and task of IP is the delivery of datagrams from the source host (source computer) to the destination host (receiving computer) based on their addresses. To achieve this, IP includes methods and structures for putting tags (address information, which is part of metadata) within datagrams. The process of putting these tags on datagrams is called encapsulation.
- 13. TYPES OF PROTOCOLS •TCP/IP (Transmission Control Protocol/Internet Protocol) suite • ARP (Address Resolution Protocol) • DHCP (Dynamic Host Configuration Protocol) • DNS (Domain Name System) • FTP (File Transfer Protocol) • HTTP (Hyper Text Transfer Protocol) • HTTPS (Hypertext Transfer Protocol Secure) • ICMP (Internet Control Message Protocol) • IGMP (Internet Group Management • NTP (Network Time Protocol) • POP3 (Post Office Protocol version 3) • RTP (Real-time Transport Protocol • SIP (Session Initiation Protocol) • SMTP (Simple Mail Transfer Protocol) • SNMP2/3 (Simple Network Management Protocol version 2 or 3) • SSH (Secure Shell) • TCP (Transmission Control Protocol) • Telnet • TFTP (Trivial File Transfer Protocol) • TLS (Transport Layer Security) • UDP (User Datagram Protocol)
- 14. INTERNET RELAY CHAT (IRC) InternetRelay Chat (IRC) is an open protocol that allows users with an IRC client to exchange text messages in real time over the Internet. Created by Jarkko Oikarinen in 1988, IRC was one of the first chat systems to allow more than two participants to join in a discussion. Like email, IRC was another application that added to the popularity of the Internet before the existence of the World Wide Web. Using an IRC client, users could connect to IRC servers and message in real time with people all over the world and join larger groups (channels). Although this is now commonplace, IRC was an early indication of the Internet’s power to create communities where time and distance would have once made it impossible. Like many aspects of the Internet, the request for comments (RFC) system was central to creating and improving IRC.
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