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- It doesn’t keep track of what it has sent so it can resend if necessary.About all that UDP provides is port numbers, so that several programs can use UDP at once.
- IP (the “internet protocol”) is responsible for routing individual datagrams.
- The reason for this upgrade is that there is need to generate more IP addresses to allow more devices to have a unique IP address on the network.
- Note that the interface between TCP and IP is fairly simple.
TCP/IP controls how information is successfully transferred between computers on the Internet. When web pages are requested and then sent over the Internet, another protocol used in addition to TCP/IP is the http protocol, crossgrid.org or Hyper Text Transfer Protocol. When files are transferred over the Internet, the FTP protocol, or File Transfer Protocol, is used. Sending email can be done using the SMTP, or Simple Mail Transfer Protocol.
GCSE Computer Science AQA
ICMP is similar to UDP, in that it handles messages that fit in one datagram. It doesn’t even have port numbers in its header.Since all ICMP messages are interpreted by the network software itself, no port numbers are needed to say where a ICMP message is supposed to go. Again, the header contains some additional fields that have not been discussed.
4 Packet Switching
This has led to the “server/client” model of network services. A server is a system that provides a specific service for the rest of the network. (Note that the server and client need not be on different computers. They could be different programs running on the same computer.) Here are the kinds of servers typically present in a modern computer setup. Note that these computer services can all be provided within the framework of TCP/IP.