Management Notes

Reference Notes for Management

What happens when the transport input ssh command is entered on the switch vty lines?

What happens when the transport input ssh command is entered on the switch vty lines?

a) The SSH client on the switch is enabled.
b) Communication between the switch and remote users is encrypted.
c) The switch requires a username/password combination for remote access.
d) The switch requires remote connections via a proprietary client software.

Correct Answer: b

When the “transport input ssh” command is entered on the switch’s VTY (Virtual Terminal Line) lines, it has a significant impact on how remote access to the switch is managed.

Let’s delve into the details of each option provided and why option b) “Communication between the switch and remote users is encrypted” is the correct answer, while the other options are not.

Correct Answer:

b) Communication between the switch and remote users is encrypted:

When you configure the “transport input ssh” command on the switch’s VTY lines, you are specifying that SSH (Secure Shell) is the only protocol allowed for remote access to the switch.

SSH is a cryptographic network protocol that provides a secure way to access network devices like switches and routers over an unsecured network, such as the internet.

It ensures that the data exchanged between the remote user and the switch is encrypted, thereby protecting it from eavesdropping and unauthorized access.

SSH uses strong encryption algorithms to secure the communication session. It authenticates the user and the switch using cryptographic keys, making it extremely difficult for malicious actors to intercept or manipulate the data being transmitted.

In summary, when you enable SSH as the transport protocol for remote access, you are enhancing the security of your network by encrypting the communication between the switch and remote users, thus safeguarding sensitive information and login credentials.

Incorrect Answers:

a) The SSH client on the switch is enabled:

This option is not entirely accurate. Enabling SSH on the switch typically involves configuring the switch to function as an SSH server, not an SSH client. When you configure “transport input ssh” on the switch’s VTY lines, you are telling the switch to allow incoming SSH connections from remote clients (users or devices).

The SSH client is typically used on remote devices (e.g., a computer) to initiate SSH connections to the switch, not on the switch itself.

c) The switch requires a username/password combination for remote access:

This option is not directly related to the “transport input ssh” command. Whether or not the switch requires a username and password combination for remote access is determined by the configuration of other parameters, such as authentication settings, on the switch.

While SSH does involve username and password authentication, this command alone does not enforce this requirement. To require username/password authentication, you need to configure additional settings like local user accounts, AAA (Authentication, Authorization, and Accounting), or external authentication methods.

d) The switch requires remote connections via proprietary client software:

Enabling SSH on the switch does not mandate the use of proprietary client software. SSH is a standardized and widely supported protocol. It can be accessed using various SSH client applications available for different operating systems, including open-source options.

Users can connect to a switch with SSH using popular SSH clients like OpenSSH, PuTTY, SecureCRT, and many others. The use of proprietary client software is not a direct consequence of configuring “transport input ssh” on the switch.

In conclusion, the “transport input ssh” command, when entered on the switch’s VTY lines, primarily enhances the security of remote access to the switch by allowing only SSH connections.

It encrypts the communication between the switch and remote users, ensuring data confidentiality and integrity. The other options presented in the question do not accurately describe the impact of this command and are therefore not correct.

Smirti

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