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Glossary of Terms -
With special thanks to all of our contributors.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
SDSL (Symmetric Digital Subscriber Line)
A version of DSL where the upload speeds and download speeds are the same.
A Search Engine is a website on the World Wide Web that indexes other websites. Users
are able to enter a word or phrase that they are interested in and have the search
engine check its index and return relevant results. A meta-
In a Network context, security consists of the provisions made in an underlying computer
network infrastructure, policies adopted by the network administrator to protect
the network and the network-
A chunk of information (often stored as a text file) that is used by the SSL protocol to establish a secure connection.
SEO (Search Engine Optimisation)
The practice of designing web pages so that they rank as high as possible in search results from search engines.
There is "good" SEO and "bad" SEO. Good SEO involves making the web page clearly describe its subject, making sure it contains truly useful information, including accurate information in Meta tags, and arranging for other web sites to make links to the page. Bad SEO involves attempting to deceive people into believing the page is more relevant than it truly is by doing things like adding inaccurate Meta tags to the page.
A server is the computer system that "serves" information to the requests from browsers
on the Internet, or to other computers on a network. Servers are usually maintained
by a server administrator and are often high-
A service level agreement (SLA) is a contract between a network service provider and a customer that specifies, usually in measurable terms, the level of performance of the network. Many Service Providers provide their customers with an SLA. More recently, IS departments in major enterprises have adopted the idea of writing a service level agreement so that services for their users, in other departments within the enterprise, can be measured, justified, and perhaps compared with those of outsourcing network providers.
Some metrics that SLAs may specify include:
- What percentage of the time services will be available
- The number of users that can be served simultaneously
- Specific performance benchmarks to which actual performance will be periodically compared
- The schedule for notification in advance of network changes that may affect users
- Help desk response time for various classes of problems
- Dial-
in access availability - Usage statistics that will be provided
A service provider is an entity that provides services to other entities. Usually this refers to a business that provides subscription or web service to other businesses or individuals. Examples of these services include Internet access, Mobile phone operator, and web application hosting.
Shareware is copyrighted software that is released by its author on a "try before you buy" basis. Shareware is usually, but not always time limited in some way. At the end of the trial time period, typically thirty days, the software will stop working or lose some of its functionality.
SLIP (Serial Line Internet Protocol)
A standard that was popular in the early 1990's for using a regular telephone line (a serial line) and a modem to connect a computer as a real Internet site. SLIP has largely been replaced by PPP.
SMDS(Switched Multimegabit Data Service)
A standard for very high-
SMTP (Simple Mail Transfer Protocol)
The main protocol used to send electronic mail from server to server on the Internet.
SMTP is defined in RFC 821 and modified by many later RFC's.
SNMP (Simple Network Management Protocol)
A set of standards for communication with devices connected to a TCP/IP network. Examples of these devices include routers, hubs, and switches.
SNMP is defined in RFC 1089
SOAP (Simple Object Access Protocol)
A protocol for client-
Microsoft's ".NET" system is largely based on SOAP.
Software is the applications and computer programs that run on your computer to enable you to use it productively.
Spam is unsolicited commercial email. Basically, it is now seen as any email you receive that you did not request and do not value.
The Spanning Tree Protocol (STP) is a link layer network protocol that ensures a
loop-
The Spanning Tree Protocol (STP) is defined in the IEEE Standard 802.1D. As the name
suggests, it creates a spanning tree within a mesh network of connected layer-
A spreadsheet is the output result of a program that is able to manipulate and order data.
Spyware is software that, without your explicit permission, captures and records your personal data and, perhaps, monitors your computers use. This data and information may be sent from your computers to servers on the Internet where it may be used for advertising purposes or other nefarious use.
SQL (Structured Query Language)
A specialized language for sending queries to databases. Most industrial-
A example of an SQL statement is:
SELECT name,email FROM people_table WHERE contry='uk'
A protocol designed by Netscape Communications to enable encrypted, authenticated communications across the Internet.
Anyone responsible for the physical operations of a computer system or network resource. For example, a System Administrator decides how often backups and maintenance should be performed and the System Operator performs those tasks.
Your system is the machine and its peripherals that you use to do your productive computer work. A system could be, for instance, a laptop or a desktop PC, complete with keyboard, mouse and printer. Popular systems are manufactured by Apple Corp and Microsoft, amongst other computer manufacturers.
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