port protocol

Android communication protocol and Android communication protocol I. TCP/IP protocol (Transport Layer Protocol) 1. Socket and ServerSocket Socket is the intermediate abstraction layer for communications between the application layer and the TCP/IP protocol cluster. Socket is

. Confirm that the destination is issued, and use it to tell the sender that the data segment before the serial numberAll received. For example, the confirmation number is x, that is, the first X-1 data segment received, only when ack=1, the confirmation number is valid, when ack=0, the confirmation number is invalid, this will require retransmission of data, to ensure the integrity of the data.SYN Synchronous serial number, TCP establishes this position 1 when establishing a connectionThe FIN s

disappears when both ends of the relayed connection are closed. A channel is often used when a portal must exist or the intermediary (intermediary) cannot interpret the relay's traffic.14. Cache: Local storage of the reaction information.2. Sending the requestAfter a connection is opened, the client sends the request message to the server's dwell port to complete the request action.The format of the http/1.0 request message is:Request message = Reque

for the port to return to the forwarding normal state. Re-viewing the port in the err-disabled state, no ports are found in this state, and the G17 state is restoredSwitch (config) #interface gigabitethernet 0/17switch (config-if) #shutdown Switch (config-if) #no shutdown switch#show Interfaces Gigabitethernet 0/17gigabitethernet0/17 is down, line protocol are d

Password Admin Login to the router's management interface, click on the router's forwarding rules-Virtual server- Add a new entry, as shown in Figure 3: Figure 3 The port mapping settings are as follows: The service port number fills in 80, if fills in 80-82 to represent maps 80, 81, 82 ports, the IP address fills in intranet Web server's IP address 192.168.1.101, the

, Proxy Server When we open the browser, enter the URL in the address bar, and then we can see the webpage. What is the principle? In fact, after we enter the URL, our browser sends a Request to the Web server. After receiving the Request, the Web server processes the Request, generates the corresponding Response, and then sends it to the browser, the browser parses the HTML in Response, so that we can see the webpage, as shown in the process. Our Request may be sent to the Web server only afte

1. Introduction to ZigBee protocol stackProtocol is a series of communication standards, both sides of the communication need to follow this standard for normal data transmission and reception. Protocol stack is a concrete implementation of the Protocol, the popular protocol stack is a

, the traffic originally assumed by the port will be allocated to other normal ports through the traffic distribution algorithm again. The traffic distribution algorithm is determined by the switch hardware.To make the port channel work normally, the member ports of the port channel must have the following attributes: All ports are in full duplex mode; The

used to remotely determine if a host is present on the network. A ping program is a basic tool for testing the connectivity of two systems. It uses only the ICMP echo request and Echo reply message, without passing through the transport layer tcp/udp. Ping servers typically implement ICMP functionality in the kernel.The accessibility of a host on a network depends not only on whether the IP layer is available, but also on what protocol and

that the connection uses, the IP address of the local host, the protocol port of the local process, the IP address of the remote host, and the protocol port of the remote process.When the application layer communicates data through the transport layer, TCP encounters a problem that provides concurrent services for mul

number is invalid, this will require retransmission of data, to ensure the integrity of the data.SYN Synchronous serial number, TCP establishes this position 1 when establishing a connectionThe FIN sender completes the send task bit, and when TCP completes the data transfer needs to disconnect, the side that proposes the disconnection will have this position 1TCPthe Baotou structure:Source Port 16-bitDestination