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address is online. It is used to test and debug a network by sending out a packet and waiting for
a response.
PPPoE (Point to Point Protocol over Ethernet)
- PPPoE is a method for the encapsulation of
PPP packets over Ethernet frames from the user to the ISP over the Internet. One reason
PPPoE is preferred by ISPs is because it provides authentication (username and password) in
addition to data transport. A PPPoE session can be initiated by either a client application
residing on a PC, or by client firmware residing on a modem or router.
PPTP (Point-to-Point Tunneling Protocol)
- A protocol (set of communication rules) that
allows corporations to extend their own corporate network through private "tunnels" over the
public Internet. Effectively, a corporation uses a wide-area network as a single large local area
network. A company no longer needs to lease its own lines for wide-area communication but
can securely use the public networks. This kind of interconnection is known as a virtual private
network.
Roaming
- In an infrastructure mode wireless network, this refers to the ability to move out of
one access point's range and into another and transparently re-associate and re-authenticate to
the new access point. This re-association and re-authentication should occur without user
intervention and ideally without interruption to network connectivity. A typical scenario would
be a location with multiple access points, where users can physically relocate from one area to
another and easily maintain connectivity.
RTS (Request To Send)
- An RS-232 signal sent from the transmitting station to the receiving
station requesting permission to transmit.
SNMP (Simple Network Management Protocol)
- A widely used network monitoring and
control protocol. Data is passed from SNMP agents, which are hardware and/or software
processes reporting activity in each network device (hub, router, bridge, etc.) to the
workstation console used to oversee the net-work. The agents return information contained in a
MIB (Management Information Base), which is a data structure that defines what is obtainable
from the device and what can be controlled (turned off, on, etc.).
Spread Spectrum
- Spread Spectrum technology is a wideband radio frequency technique
developed by the military for use in reliable, secure, mission-critical communications systems.
It is designed to trade off bandwidth efficiency for reliability, integrity, and security. In other
words, more bandwidth is consumed than in the case of narrowband transmission, but the trade
off produces a signal that is, in effect, louder and thus easier to detect, provided that the
receiver knows the parameters of the spread-spectrum signal being broadcast. If a receiver is
not tuned to the right frequency, a spread-spectrum signal looks like background noise. There
are two main alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping
Spread Spectrum (FHSS).
SSID (Service Set IDentifier)
- A unique name shared among all points in a wireless network.
The SSID must be identical for each point in the wireless net-work and is case-sensitive.
19216811.live