Glossary Terms - E

encapsulation (encapsulation)
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 network layer (IP), followed by a header from the transport layer (TCP), followed by the application protocol data. [Source: RFC 1208]
end system (end system)
An OSI system which contains application processes capable of communicating through all seven layers of OSI protocols. Equivalent to Internet host. [Source: RFC 1208]
ES-IS (End system to Intermediate system protocol)
The OSI protocol by which end systems announce themselves to intermediate systems. [Source: RFC 1208]
entity (entity)
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: RFC 1208]
EUnet (EUnet)
European UNIX Network. [Source: RFC 1208]
EARN (European Academic Research Network)
A network using BITNET technology connecting universities and research labs in Europe. [Source: RFC 1208]
EWOS (European Workshop for Open Systems)
The OSI Implementors Workshop for Europe. See OIW. [Source: RFC 1208]
European UNIX Users Group. [Source: RFC 1208]
EGP (Exterior Gateway Protocol)
A reachability routing protocol used by gateways in a two-level internet. EGP is used in the Internet core system. See core gateway. [Source: RFC 1208]
XDR (eXternal Data Representation)
A standard for machine- independent data structures developed by Sun Microsystems. Similar to ASN.1. [Source: RFC 1208]

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