Скачать или смотреть CCNA Telent SSH Class 26

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Telnet is the standard TCP/IP protocol for virtual terminal service, while SSH or Secure Shell is a program to log into another computer over a network to execute commands in a remote machine. Telnet is vulnerable to security attacks, while SSH helps you overcome many of Telnet's security issues.
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The CCNA—which stands for Cisco Certified Network Associate—is an entry-level information technology (IT) certification issued by networking hardware company Cisco. The CCNA is designed to validate your knowledge on fundamental networking concepts often requested in networking roles in IT positions