CCNA 200 - 301 - Lesson 95: Remote Access Methods: Telnet vs SSH

Section - 20: Mastering IP Services
Lesson 95: Remote Access Methods: Telnet vs SSH

We are back again with a new video in our Free CCNA Course series! In this video, we will discuss different remote access methods available on Cisco IOS.

There are two Different remote access methods that are available on the Cisco iOS known as Telnet and SSH, which stands for Secure Shell. Both are TCP based protocols and use 7 application layers of protocol but there are differences between both of these options as Telnet uses Port number 23 and designed for the local area network and SSH uses Port number 22. In the case of Telnet, the conversation happening between the networking device and the end device, like the computer and router, computer and firewall or computer and the end switch, takes place in the form of plain text.
Whereas, when the SSH is being used, the conversation between these two devices happen in the encrypted form and the IP domain must be defined here along with the key that could be generated. This is the preferred method of communication as it is secure and not easily accessible by the outside sources. SSH also authenticates the remote users and utilizes public key encryption , however, Telnet uses no such authentication process.

Telnet can be defined as a protocol that makes it possible for the user to conversate with other remote devices. It is mostly adopted by the network administrators to remotely access and manage devices by telnetting to the IP address or the hostname of the device that they want to have a conversation with. That is why it is widely used in the private area networks where the users are limited. The use of bandwidth is low in the case of Telnet.
SSH also allows remote access and management of a device and as the conversation happens over a network, it is secured from third party accessing and eavesdropping.
Therefore, it is appropriate for the public networks and it also has a high bandwidth usage.
In this video, we have discussed the different protocols available on Cisco IOS for remote access are.
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