C Broadband, Internet, and Networking De nitions in .NET

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Appendix C Broadband, Internet, and Networking De nitions
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IP address: The four-byte address, which must be unique in the entire Internet if connected, that identi es host network connections. Normally seen in the dotted-decimal format, such as 204.251.122.12. Internet committees oversee IP address coordination and distribution latency: Delay over a data transmission line for a signal s round trip Linux: A Unix-like operating system created by a worldwide group of volunteers and packaged for convenience by some software companies but also available free in most cases if you download it from the Internet Local Area Network (LAN): A network connected by physical cables, such as within a oor or building. Wireless networks are usually called WLANs, but the mixing of connection options is blurring that distinction and now many people call the network a LAN no matter what types of connections are used localhost: Standard IP address, 127.0.0.1, used as an internal address for each network device for troubleshooting and references for software on that device malware: Generic term for malicious software, including viruses, worms, and Trojans modem: Originally short form for MOdulator-DEModulator, to turn digital computer signals into analog sounds for transport over a voice telephone link. Now it refers to any box connecting computers to a communications link mscon g: Microsoft System Con guration utility Network Attached Storage (NAS): A specialized server providing access to storage separate from any le server. Includes a cut-down operating system that just controls le access through common protocols like Windows networking, TCP/IP, SMB, and AppleTalk Open Systems Interconnection (OSI) model: A reference model for the layering of common functions in a telecommunications system. This model consists of seven layers that de ne how an ideal network operates. These layers include Application, Presentation, Session, Transport, Network, Data Link, and Physical open systems: Technically, a goal of guaranteed interoperability between disparate operating systems. Marketing has recast this term to mean any system that can be coerced to communicate with TCP/IP (Transmission Control Protocol/Internet Protocol). Realistically, open systems utilize Internet and Web technologies to support any client connecting to any server packet: A block of data sent across the network; the basic unit of information used in network communications. Service requests, service responses, and data are all formed into packets by the network interface card driver software before the information is transmitted. Packets may be of xed or variable length. Large blocks of information will automatically be broken into appropriately sized packets for the network and reassembled by the receiving system
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552 Appendix C Broadband, Internet, and Networking De nitions
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password: The most common security measure used in networks to identify a speci c, authorized user of the system. Each user should have a unique password, and each network resource should require a password peer-to-peer: Communications from one station directly to another station without a server of any kind in the middle ping: Diagnostic utility to check network connections between devices and that a remote device is awake and functioning port: Address location in software Post Of ce Protocol v3 (POP3): An Internet protocol for retrieving e-mail from a mailbox located on a server Powerline: Another name for HomePlug Ethernet over electrical wiring Program: A software program, which may or may not use the available network resources. Also referred to as an application proxy server: A server that acts on behalf of others, such as for caching Web content Public Key Infrastructure Services (PKIS): A service that allows developers to take advantage of a public/private key infrastructure rather than writing their own public/private key systems public key/private key security: An encryption mechanism that employs two unique keys for encrypting data. The publicly available key is used to encrypt the data, and the private key is used to decrypt the data. The public key cannot be used to decrypt data that it has previously encrypted restore: To replace a le or les from the backup media onto the server hard disk. This is done when the le or les on the server hard disk have been erased or corrupted by accident (most commonly) or when an entire disk s worth of les needs to be replaced after a disk failure router: A hardware and/or software device that links two or more networks and sends data packets to the correct network based on the packet s destination address. The router maintains tables of available routes and forwards the data packet on toward the destination based on the optimal route. Routers function at the third layer of the OSI model Secure Sockets Layer (SSL): Program extensions created by Netscape that manage the security of data crossing a network by encrypting the data. SSL can be implemented between many different types of clients and servers, including Web browser and mail clients Simple Mail Transfer Protocol (SMTP): An Internet protocol standard used for transporting e-mail messages across the Internet from SMTP clients to SMTP servers
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