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Why is it said that FTP sends control information out-of-band?
FTP uses two parallel TCP connections, one connection for sending control information (such as a request to transfer a file) and another connection for actually transferring the file. Because the control information is not sent over the same connection that the file is sent over, FTP sends control information out of band.
Why is it said that FTP sends control information 'out-of-band'?
FTP uses two parallel TCP connections, one connection for sending control information (such as a request to transfer a file) and another connection for actually transferring the file. Because the control information is not sent over the same connection that the file is sent over, FTP sends control information out of band.
Is FTP connectionless or connection-oriented?
If FTP did not have TCP working with it, it could be considered connectionless. TCP is connection oriented and it verifies the FTP transfers have been received. Therefore it is considered Connection Oriented. If FTP used UDP it would be considered connectionless as UDP just sends the data and never checks to see if it all made it to the recipient -
What ports need to be open for the client to use the FTP client software?
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a 'data' port and a 'command' port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port. The confusion begins however, when we find that depending on the mode, the data port is not always on port 20. In active mode FTP the client connects from a random unprivileged port (N > 1023) to the FTP server's command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20. From the server-side firewall's standpoint, to support active mode FTP the following communication channels need to be opened: * FTP server's port 21 from anywhere (Client initiates connection) * FTP server's port 21 to ports > 1023 (Server responds to client's control port) * FTP server's port 20 to ports > 1023 (Server initiates data connection to client's data port) * FTP server's port 20 from ports > 1023 (Client sends ACKs to server's data port) In order to resolve the issue of the server initiating the connection to the client a different method for FTP connections was developed. This was known as passive mode, or PASV, after the command used by the client to tell the server it is in passive mode. In passive mode FTP the client initiates both connections to the server, solving the problem of firewalls filtering the incoming data port connection to the client from the server. When opening an FTP connection, the client opens two random unprivileged ports locally (N > 1023 and N+1). The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command. The result of this is that the server then opens a random unprivileged port (P > 1023) and sends the PORT P command back to the client. The client then initiates the connection from port N+1 to port P on the server to transfer data. From the server-side firewall's standpoint, to support passive mode FTP the following communication channels need to be opened: * FTP server's port 21 from anywhere (Client initiates connection) * FTP server's port 21 to ports > 1023 (Server responds to client's control port) * FTP server's ports > 1023 from anywhere (Client initiates data connection to random port specified by server) * FTP server's ports > 1023 to remote ports > 1023 (Server sends ACKs (and data) to client's data port)
How php program is saved?
It depends on the editor you are using. In most of them is the "Save" or "Save As" option. Some also sends the program directly to a server, using FTP protocol.
How do you upload a template you made to a FREE web hosting site such as synthasite dot com?
They should give you access to FTP, in which you should download and install FileZilla(Free FTP). If no ftp access then they definitely should have a file manager in the control panel (something like photobucket if you ever used that).
Why ftp uses two ports?
FTP uses separate ports for data and control. port 20 for data port 20 for control connection. Inorder to avoid the extra headers and details for each and every packets which will consume the bandwidth. A separate port is used for data connection.
What is Cute FTP?
Cute FTP is a FTP client (used to connect to a server). FTP is a point-to-point protocol used for file transfert (FTP meaning File Transfert Protocol).
24 What is the FTP command to close an FTP session?
BYE = Disconnect the FTP session
Why ftp use two ports numbers?
FTP uses separate ports for data and control. port 20 for data port 20 for control connection. Inorder to avoid the extra headers and details for each and every packets which will consume the bandwidth. A separate port is used for data connection.
1998 Ford Ranger p0451?
P0451 - Evap Emission Control System Pressure Sensor Performance Improving my answer - P0451 - intermittant open or short in the fuel tank pressure sensor ( FTP ) or the FTP sensor signal
What is the default port number for the FTP service?
In networking FTP uses both ports 21 and 22.
