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Learn about SMTP, LPD, X Window, SNMP, TCP, and UDP Protocols
Simple Mail Transfer Protocol (SMTP)
Simple Mail Transfer Protocol (SMTP), answering our ubiquitous call to email, uses a spooled, or queued, method of mail delivery. Once a message has been sent to a destination, the message is spooled to a device-usually a disk. The server software at the destination posts a vigil, regularly checking the queue for messages. When it detects them, it proceeds to deliver them to their destination. SMTP is used to send mail; POP3 is used to receive mail.
Line Printer Daemon (LPD)
The Line Printer Daemon (LPD) protocol is designed for printer sharing. The LPD,[link widoczny dla zalogowanych], along with the Line Printer (LPR) program, allows print jobs to be spooled and sent to the network's printers using TCP/IP.
X Window
Designed for client/server operations, X Window defines a protocol for writing client/server applications based on a graphical user interface (GUI). The idea is to allow a program, called a client, to run on one computer and have it display things through a window server on another computer.
Simple Network Management Protocol (SNMP)
Simple Network Management Protocol (SNMP) collects and manipulates valuable network information. It gathers data by polling the devices on the network from a management station at fixed or random intervals,[link widoczny dla zalogowanych], requiring them to disclose certain information. When all is well, SNMP receives something called a baseline -a report delimiting the operational traits of a healthy network. This protocol can also stand as a watchdog over the network,[link widoczny dla zalogowanych], quickly notifying managers of any sudden turn of events. These network watchdogs are called
Agents, and when aberrations occur, agents send an alert called a trap to the management station.
Transmission Control Protocol (TCP)
Transmission Control Protocol (TCP) takes large blocks of information from an application and breaks them into segments. It numbers and sequences each segment so that the destination's TCP stack can put the segments back into the order the application intended. After these segments are sent, TCP (on the transmitting host) waits for an acknowledgment of the receiving end's TCP
Virtual circuit session, retransmitting those that aren't acknowledged
User Datagram Protocol (UDP)
If you were to compare User Datagram Protocol (UDP) with TCP, the former is basically the scaled-down economy model that's sometimes referred to as a thin protocol. Like a thin person on a park bench,[link widoczny dla zalogowanych], a thin protocol doesn't take up a lot of room-or in this case, much bandwidth on a network.
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