Week 6: Common TCP Applications



Many protocols are used in the TCP application layers to do many things like web browsing, sending and receiving email, terminal emulation, and file transfers. In this blog, I will review the application protocol that uses Transmission Control Protocol (TCP) and its port number.

Web browsing

HTTP

Web browsing runs through hypertext transfer protocols (HTTP). All the web browsers on the internet run through these protocols, and they use TCP port 80. The weakness of HTTP is that it is not a secure protocol and is vulnerable.

HTTPS

Fortunately, there are hypertext transfer protocols over SSL (secure sockets layer) (HTTPS) to tackle this. This protocol is similar to HTTP but more secure as it provides authentication, encryption, and non-repudiation.

Terminal emulation

Telnet

Telnet protocol or Telnet allows you to remotely access another computer server from anywhere using the command prompt over the network. Telnet runs on TCP port 23. But telnet shouldn’t be used in modern computers as it is not secure.

SSH

Telnet has been replaced by SSH which does the same thing as telnet, but it is secure. SSH uses TCP port 22.

Email

SMTP

Simple mail transfer protocol is a protocol that email clients use to send email. It uses TCP port 25.

POP3

Post office protocol version 3 is one of the two protocols that receive email from SMTP. POP3 uses TCP port 110 and is outdated.

IMAP4

Internet Message Access Protocol version 4 is another alternative to POP3. It also receives messages from SMTP and supports other features that POP3 doesn’t have, such as synchronization of mail among other devices. IMAP4 uses a TCP port 143.

File transfers

FTP

FTP (File transfer protocol) is a protocol that is used on the internet to transfer files. There are two ways of doing this: active and passive. The active uses port 20, and the passive uses 21 port.

 

 

 

 

 

 

 

 

 

 

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