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In computer networking, the Reliable User Datagram Protocol (RUDP) is a transport layer protocol designed at Bell Labs for the Plan 9 operating system.It aims to provide a solution where UDP is too primitive because guaranteed-order packet delivery is desirable, but TCP adds too much complexity/overhead.
The Messenger service in Windows 2000 and Windows XP uses the NetBIOS over TCP/IP (NetBT) protocol. The service waits for a message, then it displays it onscreen. The alternative way to send a message is to write it to a MailSlot named messngr. It requires UDP ports 135, 137, and 138 and TCP ports 135, 139, and 445 to work.
Since UDP state usually expires after short periods of time in the range of tens of seconds to a few minutes, [2] and the UDP port is closed in the process, UDP hole punching employs the transmission of periodic keep-alive packets, each renewing the life-time counters in the UDP state machine of the NAT.
The Daytime Protocol is a service in the Internet Protocol Suite, defined in 1983 in RFC 867 by Jon Postel. It is intended for testing and measurement purposes in computer networks. A host may connect to a server that supports the Daytime Protocol on either Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port 13. The server ...
For example, a watchdog timer may be used when running untrusted code in a sandbox, to limit the CPU time available to the code and thus prevent some types of denial-of-service attacks. [2] In real-time operating systems , a watchdog timer may be used to monitor a time-critical task to ensure it completes within its maximum allotted time and ...
The firewall can use these unique connection identifiers to know when to remove a session from the state table without waiting for a timeout. UDP is a connectionless protocol, [4] which means it does not send unique connection-related identifiers while communicating. Because of that, a session will only be removed from the state table after the ...
UDP is a simple message-oriented transport layer protocol that is documented in RFC 768.Although UDP provides integrity verification (via checksum) of the header and payload, [4] it provides no guarantees to the upper layer protocol for message delivery and the UDP layer retains no state of UDP messages once sent.
In the Microsoft Windows and ReactOS [2] command-line interfaces, the timeout command pauses the command processor for the specified number of seconds. [ 3 ] [ 4 ] In POP connections, the server will usually close a client connection after a certain period of inactivity (the timeout period).