9 Computer Networking Services

Hey there ; )

Let's start with something special.

As you all know we use different sorts of services all around us knowingly or unknowingly in our communications. There are some tasks assigned to these services and these are the services which basically are used for communication between computers, and those communications are done through different ports and these services runs over some protocols set for them.

Let's talk about them one by one :

1. FTP (File Transfer Protocol) :

   • Runs on TCP port 20 & 21.
   • Used to transfer files over the internet.
   • It asks for authentication before the file transfer.

2. TELNET (Telecommunications Network) :

   • Runs on TCP port 23.
   • It establishes a connection between the server and remote computer.
   • Connection is done only after the authentication is approved.

3. SSH (Secure Shell) :

   • Runs on TCP port 22.
   • Carries out the tasks remotely connecting to a remote server or host.
   • Only the authorised person can remotely log on to the system.

4. SMTP (Simple Mail Transfer Protocol) :

   • Runs on TCP port 25.
   • Makes sure that emails are sent over the network securely.
   • And also makes sure that the messages are delivered successfully.

5. DNS (Domain Name System) :

   • Runs on TCP & UDP port 53.
   • It connects different hostnames of different networks to their respective IP Addresses.

6. DHCP (Dynamic Host Configuration Protocol) :

   • Runs on UDP port 67 & 68.
   • It automatically assigns IP Address related information to clients on the network.
   • Port 67 accepts the requests from DHCP and sends data to the server whereas Port 68 responds to the requests of DHCP and forwards data to the client.

7. HTTP (HyperText Transfer Protocol) :

   • Runs on TCP port 80.
   • It allows the browser to connect to the web pages on the web.
   • After the establishment of the connection we can connect to the www and get access to various web pages.

8. HTTPS (HyperText Transfer Protocol Secure) :

   • Runs on TCP port 443.
   • It establishes secure connections to make secure data is transmitted securely over the network.
   • It authenticates and encrypts the packets on the network before being transferred and this is done by the use of SSL (Secure Socket Layer).

9. POP3 (Post Office Protocol 3) :

   • Runs on TCP port 110.
   • Allows e-mail messages to get received from the SMTP servers.
   • Downloads the messages from the server and then deletes them once downloaded.
   • The authentication details transferred are not encrypted.

Happy Hacking ; )