Transport Mode

A mode of IPSec when used in a VPN. In transport mode, the IP packet data is encrypted but the header of the packet is not. An IPSec protocol used with ESP or Alt in which the ESP or Alt header is inserted between the IP header and the upperlayer protocol of an IP packet.

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A mode of IPSec when used in a VPN. In tunnel mode, the entire IP packet is encrypted and a new header is added to the packet to govern transmission through the tunnel. An IPSec protocol used with ESP in which the header and contents of an IP packet are encrypted and encapsulated prior to transmission, and a new IP header is added.
A protocol in development by the IETF to support secure data exchange. Once completed, IPSec is expected to be widely deployed to implement virtual private networks (VPNs). IPSec supports two encryption modes: Transport and Tunnel. Transport mode encrypts the data portion (payload) of each packet but leaves the header untouched. Tunnel mode is more secure because it encrypts both the header and the payload. On the receiving side, an IPSeccompliant device decrypts each packet.
A network connection established between two systems over an existing private or public network. A VPN provides confidentiality and integrity for network traffic through the use of encryption. A secure private network that uses the public telecommunications infrastructure to transmit data. In contrast to a much more expensive system of owned or leased lines that can only be used by one company, VPNs are used by enterprises for both extranets and wide are intranets. Using encryption and authentication, a VPN encrypts all data that passes between two Internet points, maintaining privacy and security. Protected information system link utilizing tunneling, security controls (. See information assurance), and endpoint address translation giving the impression of a dedicated line.
ATM is a highbandwidth, lowdelay switching and multiplexing technology. It is a datalink layer protocol. This means that it is a protocolindependent transport mechanism. ATM allows very highspeed data transfer rates at up to 155 Mbps. Data is transmitted in the form of 53byte units called cells. Each cell consists of a 5byte header and a 48byte payload. The term “asynchronous” in this context refers to the fact that cells from any one particular source need not be periodically spaced within the overall cell stream. That is, users are not assigned a set position in a recurring frame as is common in circuit switching. ATM can transport audio/video/data over the same connection at the same time and provide QoS (Quality of Service) for this transport.
An alternate name for user mode. The less-powerful security domain of the Windows operating environment where user applications reside. User mode is distinct from kernel mode (aka privileged mode). User mode offers restricted resources, indirect and limited access to hardware, and isolation between processes. See also privileged mode.

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