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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 make sure 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.
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 group. A subset of 802.11e features is described in the WME specification.
RADIUS
The Remote Authentication Dial-In User Service (RADIUS) provides an authentication and
accounting system. It is a popular authentication mechanism for many ISPs.