Network Applications and Protocols
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1 Network Applications and Protocols
2 VoIP (Voice over Internet Protocol) Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service.
3 Early providers of voice-over-ip services offered business models and technical solutions that mirrored the architecture of the legacy telephone network. Second-generation providers, such as Skype, have built closed networks for private user bases, offering the benefit of free calls and convenience while potentially charging for access to other communication networks. This has limited the freedom of users to mix-and-match third-party hardware and software.
4 Third-generation providers, such as Google Talk, have adopted the concept of federated VoIP which is a departure from the architecture of the legacy networks. These solutions typically allow dynamic interconnection between users on any two domains on the Internet when a user wishes to place a call. VoIP systems employ session control and signalling protocols to control the signalling, set-up, and teardown of calls. They transport audio streams over IP networks using special media delivery protocols that encode voice, audio, video with audio codecs, and video codecs as Digital audio by streaming media.
5 Streaming Media Streaming media is multimedia that is constantly received by and presented to an end-user while being delivered by a provider. Its verb form, "to stream", refers to the process of delivering media in this manner; the term refers to the delivery method of the medium rather than the medium itself.
6 A client media player can begin playing the data (such as a movie) before the entire file has been transmitted. Distinguishing delivery method from the media distributed applies specifically to telecommunications networks, as most other delivery systems are either inherently streaming (e.g., radio, television) or inherently nonstreaming (e.g., books, video cassettes, audio CDs).
7 The term "streaming media" can apply to media other than video and audio such as live closed captioning, ticker tape, and real-time text, which are all considered "streaming text". The term "streaming" was first used in the early 1990s as a better description for video on demand on IP networks. Live streaming, which refers to content delivered live over the Internet, requires a camera for the media, an encoder to digitize the content, a media publisher, and a content delivery network to distribute and deliver the content.
8 FTP (File Transfer Protocol) The File Transfer Protocol (FTP) is a standard network protocol used to transfer computer files from one host to another host over a TCPbased network, such as the Internet. FTP is built on a client-server architecture and uses separate control and data connections between the client and the server. FTP users may authenticate themselves using a clear-text sign-in protocol, normally in the form of a username and password, but can connect anonymously if the server is configured to allow it.
9 For secure transmission that protects the username and password, and encrypts the content, FTP is often secured with SSL/TLS (FTPS). SSH File Transfer Protocol (SFTP) is sometimes also used instead, but is technologically different. The first FTP client applications were command-line applications developed before operating systems had graphical user interfaces, and are still shipped with most Windows, Unix, and Linux operating systems. Many FTP clients and automation utilities have since been developed for desktops, servers, mobile devices, and hardware, and FTP has been incorporated into productivity applications, such as Web page editors.
10 Electronic mail, most commonly referred to as or since ca. 1993, is a method of exchanging digital messages from an author to one or more recipients. Modern operates across the Internet or other computer networks. Some early systems required that the author and the recipient both be online at the same time, in common with instant messaging.
11 Today's systems are based on a store-and-forward model. servers accept, forward, deliver, and store messages. Neither the users nor their computers are required to be online simultaneously; they need connect only briefly, typically to a mail server, for as long as it takes to send or receive messages. Originally a text-only (ASCII) communications medium, Internet was extended to carry, e.g. text in other character sets, multi-media content attachments, a process standardized in RFC 2045 through Collectively, these RFCs have come to be called Multipurpose Internet Mail Extensions (MIME).
12 Electronic mail predates the inception of the Internet and was in fact a crucial tool in creating it. is an information and communications technology. It uses technology to communicate a digital message over the Internet. Users use differently, based on how they think about it. There are many software platforms available to send and receive. Popular platforms include Gmail, Hotmail, Yahoo! Mail, Outlook, and many others. Network-based is now carried by the Simple Mail Transfer Protocol (SMTP).
13 Instant Messaging Instant messaging (IM) is a type of online chat which offers real-time text transmission over the Internet. A LAN messenger operates in a similar way over a local area network. Short messages are typically transmitted bi-directionally between two parties, when each user chooses to complete a thought and select "send". Some IM applications can use push technology to provide real-time text, which transmits messages character by character, as they are composed.
14 More advanced instant messaging can add file transfer, clickable hyperlinks, Voice over IP, or video chat. Non-IM types of chat include multicast transmission, usually referred to as "chat rooms", where participants might be anonymous or might be previously known to each other (for example collaborators on a project that is using chat to facilitate communication). Instant messaging systems tend to facilitate connections between specified known users (often using a contact list also known as a "buddy list" or "friend list"). Depending on the IM protocol, the technical architecture can be peer-to-peer (direct point-to-point transmission) or client-server (a central server retransmits messages from the sender to the receiver).
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