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| Term |
Description |
| EAP |
EAP (Extensible Authentication Protocol) is a point-to-point protocol extension used under the 802.1x framework that provides support for additional authentication methods within PPP.
See also: LEAP, EAP-FAST |
| EAP-FAST |
EAP-FAST (Extensible Authentication Protocol-Flexible Authentication via Secure Tunneling). It is a follow-on authentication technology to LEAP introduced by Cisco to provide protection against dictionary attacks.
See also: EAP, LEAP |
| EAPoL |
EAPoL (Extensible Authentication Protocol over LAN) is a network port authentication protocol used in IEEE 802.1X (Port Based Network Access Control) developed to give a generic network sign-on to access network resources. EAPoL, similar to EAP, is a simple encapsulation that can run over any LAN. EAPoL is used in the WPA four-way handshake. |
| egress |
A measure of the degree to which signals from a nominally closed coaxial cable system are transmitted through the air. Also known as Signal Leakage. The FCC requires that egress be monitored and controlled by CATV system operators. |
| EIA |
Electronic Industries Association. A trade organization in Washington representing manufacturers of electronic equipment in the United States. |
| EIRP |
EIRP (effective isotropically radiated power) - the arithmetic product of (a) the power supplied to an antenna and (b) its gain. |
| EIRP |
EIRP (equivalent isotropically radiated power) is a measure of the total effective transmitting power of radio including adding gains from an antenna and subtracting losses from an antenna cable.
In 802.11x Wi-Fi networks, from the viewpoint of US FCC regulations for Point to Multi-Point, you are allowed only 36 dBm (4 Watts) EIRP. This is 30 dBm (1 watt) into a 6 dBi antenna. Point-to-point systems allow for higher EIRP. |
| EMI |
EMI (Electromagnetic Induction/Interference) is a term used to describe disturbances to electrical signals that can arise from a wide range of sources. EMI can affect all types of copper communications cables. Optical fiber is completely immune to EMI. |
| encapsulation |
The process of putting data inside a larger "package" (or packet, transmission unit) that includes a header and possibly an end-of-packet identifier. The encapsulation may be thought of as putting a letter in an envelope for transport to another location. |
| encryption |
The process of rendering a digital signal unintelligible to any receiver that doesn't have some unique piece of information needed to recover that signal. |
| ESSID |
ESSID (Extended Service Set Identifier) is a unique identifier which is attached to the header of packets sent over a WLAN. The ESSID differentiates one WLAN from another, so all access points and all devices attempting to connect to a specific WLAN must use the same ESSID. A device will not be permitted to join the network group unless it can provide the same unique ESSID. An ESSID is also referred to as a Network Name because essentially it is a name that identifies a wireless network. The ESSID is a 32-character maximum string and is case-sensitive.
See aslso: SSID |
| Ethernet |
Ethernet is an IEEE data communications protocol originally developed for premises and local access networks (IEEE 802.3). It was originally developed for peer-to-peer communications using shared media over relatively short distances. Ethernet has been substantially improved over the years and now operates in a wide variety of settings. Ethernet is currently the most widely deployed LAN protocol in the world.
Some of the newer variants of the standard include;
Fast Ethernet - Ethernet at 100 Megabits per second.
Gigabit Ethernet (Gig-E) - Ethernet at 1000 Megabits per second. |
| ETSI |
European Telecommunications Standards Institute (ETSI) is an independent, non-profit organization that produces telecommunications standards.
ETSI is officially responsible for standardization of Information and Communication Technologies (ICT) within Europe. These technologies include telecommunications, broadcasting and related areas.
ETSI Website |
| EUI |
EUI (Extended Unique Identifier) allows a network interface to assign itself a unique 64-bit IPv6 address (EUI-64). This feature is a key benefit over IPv4 as it eliminates the need of manual IP address configuration, or DHCP.
The IPv6 EUI-64 format address is obtained from the 48-bit MAC address. The MAC address of network interfaces consists of two 24-bit parts, with one being OUI (Organizationally Unique Identifier) and the other being a unique NIC specific number. The EUI is constructed by splitting the MAC address in its two parts, inserting "FFFE" in between the two poeces, and inverting the 7th bit (called the "universal unique bit"). See: [RFC2373] [RFC3513]
Notes:
Linux/MAC uses the EUI to automatically assign IPv6 addresses. Windows Vista/7/8/10/Server 2008 create random interface ids instead of using EUI-64. |
| extender |
In wireless networking, an extender (wireless range extender, a.k.a wireless repeater) takes an existing signal from a wireless router or access point and rebroadcasts it to/from wireless clients to extend the range of the network. It differs from access points in that it connects wirelessly to all devices on both ends of the connection.
In contrast, an access point only connects wirelessly to clients, however, it uses wired networking to connect to the main router (and possibly the internet). |
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