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Here’s a clear comparison between Telnet and SSH.

Telnet:

Transmits data (including usernames and passwords) in plain text.
Highly insecure and vulnerable to eavesdropping and attacks.

SSH (Secure Shell):

Encrypts all communication, including authentication and data transfer.
Provides strong security against interception and man-in-the-middle attacks.

An IP address is a unique identifier for a device on a network.
IPv4: 32-bit address (e.g., 192.168.1.1)
IPv6: 128-bit address (e.g., 2001:0db8:85a3::8a2e:0370:7334)
Types of IP addresses:
- Public IP: Used on the internet.
- Private IP: Used within local networks (e.g., 192.168.x.x)