Which of the following is a difference between Telnet and SSH as supported by Cisco switch?

Q: In what modes can you type the command show MAC address table and expect to get a response with MAC table entries choose two answers?

Explanation. The command show mac address-table can be executed from the User or the Enable mode.

In order to access the machine at remote location networking provide us various application programs among which Telnet and SSH are the primary client server application program and uses remote terminal service which allows a user at one site to interact with a remote time-sharing system at another site as if the user’s keyboard and a display connected directly to the remote machine.

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Download the difference table here.
Which of the following is a difference between Telnet and SSH as supported by?
What type of switch memory is used to store the configuration used by the switch when it is up and working?
In which of the following modes of the command line interface CLI could you issue the command reload to reboot the switch?
In what modes can you type the command show MAC address table and expect to get a response with MAC table entries choose two answers?

TELNET and SSH both are Layer - 7 application layer protocols and both uses TCP( transmission control protocol ) at transport layer.

Following are the important differences between Telnet and SSH.

Sr. No.	Key	Telnet	SSH
1	Definition	Telnet is the joint abbreviation of Telecommunications and Networks and it is a networking protocol best known for UNIX platform designed specifically for local area networks.	On other hand SSH or Secure Shell is a program to log into another computer over a network, to execute commands in a remote machine, and to move files from one machine to another.
2	Operation	Telnet uses the port 23 and it was designed specifically for local area networks.	SSH on other hand runs on port 22 by default however it can be easily changed.
3	Security	As compared to SSH Telnet is less secured.	On other hand SSH is a very secure protocol because it shares and sends the information in encrypted form
4	Data format	Telnet transfers the data in simple plain text.	On other hand SSH uses Encrypted format to send data and also uses a secure channel.
5	Authentication	No authentication or privileges are provided for user's authentication.	As SSH is more secure so it uses public key encryption for authentication.
6	Preference	Due to its less security private networks are recommended for Telnet.	On other hand SSH suitable for Public networks.

Updated on 24-Feb-2020 10:50:15

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SSH VS TELNET – Difference between SSH and Telnet

Telnet is the protocol that allows a user to communicate with a remote device. It is used mostly by network administrators to remotely access and manage devices.

An administrator can access the device by telnetting to the IP address or hostname of a remote device.

To use telnet, a software (Telnet client) must be installed. On a remote device, a Telnet server must be installed and running. Telnet uses TCP port 23. Telnet was designed to work within a private network and not across a public network where threats can appear

SSH is the protocol used to remotely access and manage a device. SSH uses encryption, which means that all data transmitted over a network is secure from eavesdropping.

Like Telnet, a user accessing a remote device must have an SSH client installed. On a remote device, an SSH server must be installed and running. SSH uses TCP port 22 by default.

SSH offers security mechanisms that protect the users against anyone with malicious intent while Telnet has no security measures. The security issues of Telnet required a people to use SSH in order to protect network.

Enlisted below are the key similarities between SSH and Telnet –

Both are network protocols which allow users to login to remote systems and execute commands on them.
Access to command line of a remote host is similar in both protocols
Both use TCP protocol
Both work in Client-Server Model
Both are terminal based protocols

Below table elaborates the difference between both the protocols –

PARAMETER	SSH	TELNET
Security	Highly secured	Less secured than SSH
Port number	Uses TCP port number 22	Uses TCP port number 23
Data format	SSH sends all the data in encrypted format. SSH uses a secure channel to transfer data over the network	Telnet sends the data in plain text.
Authentication	SSH uses public key encryption in order to authenticate the remote users	Telnet uses no authentication mechanisms
Data Privacy	Usernames and Passwords can be prone to malicious attack	Data sent using this protocol cannot be easily interpreted by the hackers.
Public/Private network recommendation	Suitable for Public networks	Suitable for private networks
Vulnerabilities	Can be considered a replacement of telnet since has overcome many of security issues of telnet	Is older than SSH and has many vulnerabilities than SSH.
Bandwidth usage	High bandwidth usage	Low bandwidth usage
Operating system	All popular Operating systems	Used in Linux and Windows Operating system.
RFC	RFC 4253 specifies SSH server	Telnet was developed in 1969 beginning with RFC 15 and extended in RFC 854

Download the difference table here.

About The Author

Rashmi Bhardwaj

I am here to share my knowledge and experience in the field of networking with the goal being - "The more you share, the more you learn." I am a biotechnologist by qualification and a Network Enthusiast by interest. I developed interest in networking being in the company of a passionate Network Professional, my husband. I am a strong believer of the fact that "learning is a constant process of discovering yourself." - Rashmi Bhardwaj (Author/Editor)