Greetings, class!
When we talk about ports and port numbers, we are referring to Layer 4 of the OSI
model, which is the transport layer. One of its functions is selecting the appropriate
port number for effective communication between the application being used and the
server. The types of ports companies use are crucial because confidential data is
often transmitted through them. Using unsecured ports can expose the company to
the risk of cyber-attacks and the leakage of sensitive information. Telnet is an old port
created before the internet, in 1969 (PowerCert Animated Videos, 2020). Because of
its age, the information transmitted through it is not encrypted and can be intercepted
by cybercriminals. Imagine sending customers' personal information, such as their
names, dates of birth, or social security numbers, through Telnet – that would
constitute a serious data breach for a corporation. Secure Shell can perform all the
functions of Telnet but provides encryption to protect sensitive data. Therefore, using
Secure Shell would be a safer and more responsible way for corporations to
communicate.
References:
CertBros. (2020, May 19). Port Numbers Explained | Cisco CCNA 200-301. YouTube.
https://www.youtube.com/watch?v=RDotMcs0Erg
PowerCert Animated Videos. (2020, March 12).Telnet vs SSH Explained.
YouTube.https://www.youtube.com/watch?v=tZop-zjYkrU
Hello Daniel,
It is crucial for companies to have constant monitoring of TCP/IP ports to prevent
unauthorized access into the system. Your point about port 22 being a common IP
port that can be exploited by attackers to gain access to a vulnerable application or
network is particularly noteworthy. Additionally, the risk of hackers leaking Secure
Shell keys and credentials through port 22 emphasizes the need for companies to be
aware of these vulnerabilities and take necessary precautions. Thank you for sharing
your insights on this topic. Good Job!
