USRobotics Instant802 APSDK - Manual (Page 316)

Professional Access Point
Administrator Guide
Glossary - 316
the fork() system call. It can be used by wait() or kill() to perform actions on the given process.
Port Forwarding
Port Forwarding creates a ‘tunnel’ through a firewall, allowing users on the Internet access to a service
running on one of the computers on your
LAN , for example, a Web server, an FTP or SSH server, or other
services. From the outside user’s point of view, it looks like the service is running on the firewall.
PPP
The Point-to-Point Protocol is a standard for transmitting network layer datagrams ( IP packets) over serial
point-to-point links. PPP is designed to operate both over asynchronous connections and bit-oriented
synchronous systems.
PPPoE
Point-to-Point Protocol over Ethernet (PPPoE) is a specification for connecting the users on a LAN to the
Internet through a common broadband medium, such as a single DSL or cable modem line.
PPtP
Point-to-Point Tunneling Protocol (PPtP) is a technology for creating a Virtual Private Network ( VPN )
within the Point-to-Point Protocol ( PPP ). It is used to ensure that data transmitted from one VPN node to
another are secure.
Proxy
A proxy is server located between a client application and a real server. It intercepts requests, attempting
to fulfill them itself. If it cannot, it forwards them to the real server. Proxy servers have two main purposes:
improve performance by spreading requests over several machines and filter requests to prevent access
to specific servers or services.
PSK
Pre-Shared Key (PSK), see Shared Key .
Public Key
A public key is used in public key cryptography to encrypt a message which can only be decrypted with the
recipient's private or secret key. Public key encryption is also called asymmetric encryption, because it
uses two keys, or Diffie-Hellman encryption. Also see
Shared Key .
Q
QoS
Quality of Service (QoS) defines the performance properties of a network service, including guaranteed
throughput, transit delay, and priority queues. QoS is designed to minimize
Latency , Jitter , Packet Loss ,
and network congestion, and provide a way of allocating dedicated bandwidth for high priority network
traffic.
The IEEE standard for implementing QoS on wireless networks is currently in-work by the 802.11e task