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Glossary: CCNA & General Networking Terms 


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The basic building block for European multi-megabit data rates, with a bandwidth of 2.048Mbps. See also: T1. [Source: RFC1983]
A European standard for transmitting data at 57.344Mbps. See also: T3. [Source: RFC1983]
European Academic and Research Network. See: Trans-European Research and Education Networking Association. [Source: RFC1983]
Edinburgh and Stirling Metropolitan Area Network.
East of England Regional Network.
See: Extended Binary Coded Decimal Interchange Code
A pan-European backbone service. [Source: RFC1392]
See: Electronic Frontier Foundation
See: Extended Four Letter Acronym
See: Exterior Gateway Protocol
Electronic Frontier Foundation (EFF)
A foundation established to address social and legal issues arising from the impact on society of the increasingly pervasive use of computers as a means of communication and information distribution. [Source: RFC1392]
Electronic Mail (email)
A system whereby a computer user can exchange messages with other computer users (or groups of users) via a communications network. Electronic mail is one of the most popular uses of the Internet. [Source: NNSC]
See: Electronic mail
email address
The domain-based or UUCP address that is used to send electronic mail to a specified destination. For example an editor's address is "". See also: bang path, mail path, UNIX- to-UNIX CoPy. [Source: ZEN]
East Midlands Metropolitan Area Network.
The technique used by layered protocols in which a layer adds header information to the protocol data unit (PDU) from the layer above. As an example, in Internet terminology, a packet would contain a header from the physical layer, followed by a header from the datalink layer (e.g. Ethernet), followed by a header from the network layer (IP), followed by a header from the transport layer (TCP), followed by the application protocol data. [Source: RFC1208]
Encryption is the manipulation of a packet's data in order to prevent any but the intended recipient from reading that data. There are many types of data encryption, and they are the basis of network security. See also: Data Encryption Standard. [Source: RFC1392]
end system
An OSI system which contains application processes capable of communicating through all seven layers of OSI protocols. Equivalent to Internet host. [Source: RFC1208]
OSI terminology for a layer protocol machine. An entity within a layer performs the functions of the layer within a single computer system, accessing the layer entity below and providing services to the layer entity above at local service access points. [Source: RFC1208]
error checking
The examination of received data for transmission errors. See also: checksum, Cyclic Redundancy Check. [Source: RFC1983]
End system to Intermediate system protocol. The OSI protocol by which end systems announce themselves to intermediate systems. [Source: RFC1208]
Extended Simple Mail Transfer Protocol. See Simple Mail Transfer Protocol.
A 10-Mb/s standard for LANs, initially developed by Xerox, and later refined by Digital, Intel and Xerox (DIX). All hosts are connected to a coaxial cable where they contend for network access using a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) paradigm. See also: 802.x, Local Area Network, token ring. [Source: RFC1392]
Ethernet meltdown
An event that causes saturation, or near saturation, on an Ethernet. It usually results from illegal or misrouted packets and typically lasts only a short time. See also: broadcast storm. [Source: COMER]
See: European Telecommunications Standards Institute
European UNIX Network, an Internet Service Provider. [Source: RFC1208]
European Telecommunications Standards Institute
A pan-European organisation of administrations, network operators, manufacturers, service providers, research bodies and users. ETSI develops standards and tecnical documentation in telecommunications, broadcasting and information technology.
European UNIX Users Group. [Source: RFC1208]
European Academic and Research Network (EARN)
European Academic and Research Network. See: Trans-European Research and Education Networking Association. [Source: RFC1983]
European Workshop for Open Systems. The OSI Implementors Workshop for Europe. See OIW. [Source: RFC1208]
Extended Binary Coded Decimal Interchange Code (EBCDIC)
A standard character-to-number encoding used primarily by IBM computer systems. See also: ASCII. [Source: RFC1392]
Extendable Markup Language (XML)
A subset of Standardised General Markup Language, for development of markup applications using Document Type Definitions (DTDs) in areas such as database searches and information interchange, in electronic business transactions and eleswhere.
Extended Four Letter Acronym (EFLA)
A recognition of the fact that there are far too many TLAs. See also: Three Letter Acronym. [Source: K. Morgan]
Exterior Gateway Protocol (EGP)
A protocol which distributes routing information to the routers which connect autonomous systems. The term "gateway" is historical, as "router" is currently the preferred term. There is also a routing protocol called EGP defined in STD 18, RFC 904. See also: Autonomous System, Border Gateway Protocol, Interior Gateway Protocol. [Source: RFC1392]
eXternal Data Representation (XDR)
A standard for machine independent data structures developed by Sun Microsystems and defined in RFC 1014. It is similar to ASN.1. See also: Abstract Syntax Notation One. [Source: RFC1208]


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