relationship between DCE/RPC and NT Named Pipes.
joed at interlude.eu.org
Thu Jan 10 07:58:08 GMT 2002
> On Thu, Jan 10, 2002 at 12:49:27AM +0000, Luke Kenneth Casson Leighton
>> unix supports TCP (guaranteed and ordered data delivery)
>> and it supports UDP (guaranteed message sizes) but it doesn't
>> support both.
> [if anyone has a more technically accurate explanation,
> i'd appreciate it if you could clarify this limited
> and ambiguous assessement: you know what i mean, but
> i can't find the words].
TCP and UDP are the two transport protocols used in the IP architecture.
TCP is a connection oriented transport protocol designed to work in
conjunction with IP. TCP provides its user (application layer) with the
ability to transmit reliably a byte stream to a destination and allows for
multiplexing multiple TCP connections within a transmitting or receiving
Being connection oriented, TCP requires a connection establishment phase
(like dialing a number to make a phone call) which is followed by the data
transmission phase. A connection is terminated when it is no longer in use.
TCP/IP is ideal for the transmission of bursty data. It works on the
principle of retransmission of dropped packets which is one of the major
contributors to delays in transmission. However, since voice and video data
are time sensitive, packet technologies such as TCP/IP cannot guarantee the
proper delivery of such data.
UDP, on the other hand, is a connectionless transport protocol designed to
operate over IP. Its primary functions are error detection and
multiplexing. UDP does not guarantee the delivery of packets (compare with
the ordinary postal service) but guarantees that if a packet is ever
delivered in error, such error will be detected (use of checksum). It also
allows for communicating with multiple processes residing on the same host
UDP packet format is simple. It is also fast compared to the use of TCP,
since there is no connection establishment phase. Moreover, UDP is
important since RTP (Real time Transport Protocol) is supported over UDP.
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