COMPUTER NETWORKING

APPLICATION LAYER

INTRODUCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In FTP, ____ well-known port(s) is (are) used.
A
1
B
2
C
3
D
4
Explanation: 

Detailed explanation-1: -FTP uses two ports: The control connection (where commands are sent) is TCP port 21, and Active FTP uses a data connection (where data is transferred) that originates from TCP port 20.

Detailed explanation-2: -Explanation: File Transfer Protocol is an application layer protocol used to share “files” between a server and a client. The protocol uses two separate ports for data and control connections: port 20 for data and port 21 for control. 2. FTP is built on architecture.

Detailed explanation-3: -The initial rationale behind this was so that you could: Continue sending and receiving control instruction on the control connection while you are transfering data. Have more than one data connection active at the same time. The server decides when it’s ready to send you data.

Detailed explanation-4: -Ports 20 and 21: These Ports are used for FTP (file transfer protocol) connection. FTP uses two TCP connections for communication. Port 21 is used for pass control information. And the other port 20 is used to send the data files between the client and the server.

There is 1 question to complete.