A functional unit that enables data terminal equipment (DTE) not equipped for packet switching to access a packet-switched network.

A packet layer reference event that corresponds to a packet entering a network section (from a circuit section) or a packet entering a DTE (from an access circuit section). [T1.504-1989]

A packet layer reference event that corresponds to a packet exiting a network section (to a circuit section) or a packet exiting a DTE (to an access circuit section). [T1.504-1989]

A type of firewall in which each packet is examined and either allowed to pass through or is rejected, based on local security policy. [INFOSEC-99]

The action a device takes to selectively control the flow of data to and from a network. Packet filters allow or block packets, usually while routing them from one network to another (most often from the Internet to an internal network, and vice-versa). To accomplish packet filtering, you set up rules that specify what types of packets (those to or… (Read More →)

The structure of data, address, and control information in a packet.
Note: The size and content of the various fields in a packet are defined by a set of rules that are used to assemble the packet.

A header consisting of octets 4 to 8 (inclusive) of the frame (flags excluded from the octet numbers). [After T1.509-1995]

See ping.

The event that occurs when a packet crossing a section boundary changes the state of the packet layer interface. [T1.504-1989]

A mode of operating a communications network in which packet switching is used rather than message switching. [From Weik '89]