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![]() Plug-in An add-on piece of software that can extend the features of an existing application. For example Netscape browser plug-ins allow displaying of new types of web content, that the browser can't display on its own. POP Post Office Protocol. Popular but inflexible email retrieval standard. All messages are downloaded at the name time and can only be manipulated on a client machine. Current version is POP3. Also see IMAP. Port A socket on the computer or other network device used to connect it to the network. PPP (Point to Point Protocol) A network protocol widely used to connect computers to the Internet. Most often used on a telephone line. PRI (Primary Rate Interface). One of the two ISDN access methods. 23 of 64 Kbps B channels and 1 64 Kbps D channel constitute a PRI. Protocol A set of rules by following which two parties can communicate. The TCP/IP protocol suite is the basis of todays Internet. PSTN (Public Switched Telephone Network). The set of all the traditional telephone lines and all the infrastructure that comes with it. Python Interpreted programming language, sometimes offered by hosts for server-side scripting. Here is the Python home page. RAID Redundant Array of Independent (or Inexpensive) Disks. Type of disk, often used on servers, where several physical disks are combined into an array for better speed and fault tolerance. Level 0 implements data striping where file blocks are written to separate drives. Does not provide fault tolerance, because failure of one drive will result in data loss. Level 1 implements data mirroring. Data is duplicated on two drives either through software or hardware. Provides faster read performance than a single drive. Level 2 - not used in practice. Data is split at bit level at written to multiple drives. Level 3 - requires at least 3 drives. Data block is striped at byte level across drives and error correction codes (parity info) is recorder on another drive. Provides fault tolerance but slower writing performance. Level 4 - Similar to Level 3 but provides faster performance because it uses blocks for striping. Level 5 - Similar to Level 4 but improves performance but also striping parity info across multiple drives. Level 6 - Similar to Level 5 but also uses second parity scheme for better fault tolerance. Level 7 - Proprietary RAID design by Storage Computer Corporation. Faster than other levels because it uses multiple levels of cache and asynchronous I/O transfers. In addition multiple RAID levels can be combined to improve performance or reliability. Raw Logs Raw access data updated in real-time that can be downloaded and used by any statistics program. Typically each line show the user's IP, date and time of the access, what kind of request was done, which document was requested, HTTP status code, bytes transferred, referrer, and user agent info. If a host doesn't have statistics, you'll need access to raw logs to identify who your site's visitors are. Analyzing raw logs can also provide more detailed look at site accesses than stats. Reseller Resellers are usually smaller companies that still try to build their customers base. They don't own the server with user accounts but can perform most administrative functions. RJ-11 A standard connector that is used to connect to the telephone line. free web site, Free Web Hosting. hosting provider
Electronic Mail (E-Mail, email) One of the most popular Internet services. Basically it's the transmission of text based messages. An email message can also contain more structured elements, like tables, images and multimedia. It can also be used to send various data files, by means of attachments. You have to have an email account in order to be able to use this service. Encryption Encryption means encoding data using a cryptographic cipher. Encrypted data can be read (decrypted) only by an authorized entity. Ethernet Local Area Network (LAN) protocol invented by Xerox Corporation. It is a broadcast protocol that uses CSMA/CD method and utilizes electrical cables. It can run at various speeds: 10Mbps, 100Mbps and even 1000Mbps. IEEE 802.3 standard describes Ethernet. Word Ethernet is also sometimes used to describe the implementation that runs at the speed of 10Mbps. Extranet A part of the company's network that is made accessible for some group of people. Sometimes protected by a password or some other kind of authentication. It allows users to access some of the non-public data, eg. a person's credit card balance. FAQ (Frequently Asked Question) Lists of frequently asked questions and answers to them are used as a way of sharing knowledge on the web. They are a very good way of finding solutions to different problems. Some companies include them in their websites to minimize the number of Customer Support inquiries. Fast Ethernet Fast Ethernet is the implementation of Ethernet standard that operates at the speed of 100Mbps. FCC (Federal Communications Commission). U.S.A. telecommunications regulatory organization. It controls standards that pertain to electronic and electromagnetic transmission and also licenses the frequencies and bandwidth for the commercial use. FDDI (Fiber Distributed Data Interface). A very high speed network protocol. Uses fiber-optic cable, and is mainly used as the backbone network protocol due to its speed. It is also often the choice for critical applications due to its reliability. Fibre Optic Cable A cable used for transmitting data as a light wave. A fiber optic cable is composed of one or more optical fibers. It is more expensive that copper wire, but offers higher transmission speeds and allows for communication over larger distances. Filename extension Last three or four letters of a file name that appear after the dot. Used to designate the type of file and the format used. hosting provider. Free Web Hosting
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