Computer Network (xxiii) other transport layer protocols

1.UDP-Lite

UDP-Lite (Lightweight User Datagram Protocol , Lightweight User Datagram Protocol) UDP is an extension of a transport layer protocol function.
If invalid, even if part of the data in the UDP checksum error will not set the entire packet is discarded. Not recommended to check on and off.
UDP-Lite and UDP provide almost the same functionality, but the checksum is calculated by the application scope can decide.
This range may be a dummy packet header plus the checksum calculation portion, the first portion may be a pseudo header checksum calculating portion, the first portion may be a pseudo header with the data checksum is calculated starting from the intermediate position to a.
You can only check and checks for the wrong section allowed to happen.

2.SCTP

SCTP (Stream Control Transmission Protocol, Stream Control Transmission Protocol) and TCP, are related to a method for providing data arrival reliability to check whether or not the transport layer protocol.
Features:
1. message transceiver unit of
the TCP receiving side does not know the size of the message sending end application of the decision. In SCTP can.
2. support multiple hosts
in the host has more than one NIC, even if the NIC which can be used to change, you can still continue to communicate.
3. Support multiple data stream communication
TCP communication is established to be the effect after multiple connections in one SCTP connection can be.
4. The message may define the lifespan of
the message exceeds the period of survival will not be retransmitted.
SCTP mainly used where a small number of messages transmitted between the application communication. These smaller data block is referred to as application messages (Chunk), a plurality of data blocks of a data packet.
SCTP has features support for multiple host and setting multiple IP addresses.
Multiple host means includes a plurality of host interfaces in the same network. SCTP may provide a more reliable transmission is provided with a plurality of host NIC.

3.DCCP

DCCP (Datagram Congestion Control Protocol, Datagram Congestion Control Protocol) is an auxiliary of the new UDP transport layer protocol.
UDP no congestion control mechanisms. For this reason, a problem when the application using UDP packets to send large amounts of data extremely vulnerable.
DCCP has the following characteristics:
1. Like with UDP does not provide reliable transmission of the transmission data.
2. It is connection-oriented, connection establishment process provided disconnected. On connect to and disconnect are reliable.
3. congestion control can be performed according to the network congestion. Use DCCP (RFC4340) application may choose between two methods of congestion control according to their characteristics.
a. Similarly TCP (TCPLike) congestion control
b.TCP upgrade-friendly control
4. To perform congestion control, after receiving the receiving terminal returns acknowledgment packet (ACK). The acknowledgment will be used to judge whether the retransmission.