waves dts

TIME_WAIT state, if the last ACK sent by the TCP client is lost, it is re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released. "Question 1" Why is the handshake three times when it is connected and four times when it is closed?A: The syn+ack message can be sent directly after the server receives

" in the time_wait state, if the last ACK sent by the TCP client is lost, it will be re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released."Question 1" Why is the handshake three times when it is connected and four times when it is closed? A: The syn+ack message can be sent directly after the se

need to go through 2MSL (maximum message segment lifetime) to return to the close state? This is because although both sides agreed to close the connection, and I received the four messages are also coordinated and sent, can be directly back to the closed state (like from the Syn_send state to establish state); but because we have to assume that the network is unreliable, You cannot guarantee that the last ACK message you send will be received by the other side, so the other side in

lost, it will be re-sent. The time required in the TIME_WAIT state is dependent on the implementation method. Typical values are 30 seconds, 1 minutes, and 2 minutes. The connection is formally closed after waiting, and all resources (including the port number) are released."Question 1" Why is the handshake three times when it is connected and four times when it is closed?A: The syn+ack message can be sent directly after the server receives the SYN connection request message from the client sid

message I received." I can't send fin messages until all the messages on my server end are sent, so I can't send them together. Therefore, four-step handshake is required.Why does the time_wait state need to go through 2MSL (maximum message segment lifetime) to return to the close state?A: Although according to reason, four messages are sent, we can go directly to the close state, but we must pretend that the network is unreliable, there can be a last ACK lost. So the TIME_WAIT state is used to

, you may also need to send some data to the other side, Send the FIN message to the other side to show that you agree that you can now close the connection, so it is here that the ACK message and fin messages are sent separately in most cases.2, why time_wait state also need to wait 2MSL to return to closed status?This is because: although both sides agree to close the connection, and the handshake of the 4 messages are also coordinated and sent, can be directly back to the closed state (like f

request is issued. A confirmation message section is sent to a, agreeing to establish a connection. Assuming a three-time handshake is not used, the new connection is established as soon as B confirms.Because a does not make a connection request now, it does not respond to the acknowledgment of B, nor does it send data to B. But B thought the new transport connection had been established and was waiting for a to send the data. Many of the resources of B have been wasted in vain.The use of three

unconsciously standing on the waves of the technological revolution. Over the past decade, they have represented the wave of Science and Technology until the next wave came ". Dozens of companies listed in the book, such as ATT IBM, apple, Intel, Microsoft, Cisco, Yahoo, and Google all represent the peaks of the times. They are the buzz of the times, and we may sigh, in that lucky age, they caught a certain detail, and then a group of young people st

[Programming Basics] three handshakes and four waves in the TCP protocol (illustration), programming basics tcp TCP establishment requires three handshakes to be established, and disconnection requires four handshakes. The entire process is shown in: Let's take a look at how to establish a connection. First, the Client sends a connection request message. The Server segment replies to the ACK packet after accepting the connection and allocates resour

Void timer0_isr (void) interrupt 1 using 1{Static unsigned char I; // returns the value of 12 m for Crystal Oscillator computation. The instruction period is 1 US, 500x2 = 1 ms square wave.Th0 = (65536-500)/256;Tl0 = (65536-500) % 256;I ++;P0 = I; // The P0 port outputs 8 different frequencies, which is equivalent to a divider and is frequently used as an indication wave.// Device measurement, which can be directly observed by led at low frequency// P0.0 outputs 1 ms square wave, p0.1 outputs 2

January 26 Question list Source Knowledge points Completion Time A 1275 Abacus Test Noip popularity group 2014 Violent ??? 2018.11.2 B C 1277 spiral Matrix Thinking ??? 2018.11.2 D E F 1208 expression evaluation (after-game question completion) Violent ??? 2018.11.2

I borrowed someone else and haven't written any logs for a few days, Written here, On Saturday, we wanted a big man to be "romantic" and went to dongkeng to eat fish ~~~~). At noon, I got out of the bus to do something. Then I planned to walk to another stop card. I turned around and fainted. After searching for a long time, I found the target car, It seems that it is "slow" and there is no "wave" yet ":) When it comes to the ground, it may be around a little bit. The fish only has a small

the target system runs slowly. In severe cases, network congestion or even system paralysis occurs. SYN attacks are typical.DDoS Attack. It is very convenient to detect SYN attacks. When you see a large number of semi-connection statuses on the server, especially when the source IP address is random, it can basically be determined that this is a SYN attack. in Linux, you can run the following command to detect SYN Attacks: Netstat-n-ptcp | grep syn_recv Generally, the new TCP/IP protocol stack

In the economic stability but lack of growth momentum of the situation, each industry is a surprise, want to in the post-crisis era to create a better future for themselves, so as to keep pace with the times to maintain steady growth. In the face of such an economic environment, the domain name industry has also been frequent moves, set off a wave of waves, cn price of the wave just calm, COM domain name and new trends. Recently, the author in the e

confirmation, the client is aware that the connection is not requested. release of TCP connections (four waves) After the data transfer is complete, both sides can release the connection. At the very beginning, both the client and the server are in a established state, and then the client shuts down actively and the server shuts down passively. The client process issues a connection release message and stops sending data. Releases the header of the

URL Access website (three handshake, four waves) 1) to obtain the corresponding IP address of the domain name, if there is no relevant data in the DNS cache, IE will issue a DNS request to the DNS server to obtain the corresponding IP address of the domain name. 2) Internet Explorer and domain name address to establish a TCP connection, three times handshake 3) HTTP access 4) Disconnect the TCP connection and wave four times Four scen

Case study of OracleStudy-system architecture for transferring tablespaces (from Linux to AIX) on Heterogeneous Platforms: source database & nbsp .. Case study of OracleStudy-system architecture for transferring tablespaces (from Linux to AIX) on

Exec master... xp_mongoshell 'dtsrun... '-- if it succeeds, call xp_mongoshell to call the dtsrun tool execution package. Run the dtsrun command in the command line window. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.

Sorry, I saw it in the afternoon.DTrAfter the analysis model and design model, I have summarized some suggestions for their improvement: LIt is necessary to clarify the return types of all methods and how to consume returned objects! LIt

System Operating ConditionsL hardware environment P4/1.4g clock speed/M memory/20G hard disk/M Nic l software environment windows98se/Windows2000/WindowsXP series Microsoft. net frameworkmdac 2.7 Office 2000/XP/2003l to migrate the SQL Anywhere