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Which of the following protocols provide a secure remote access to network devices?
Telnet
UDP
SSH
TCP
FTP
SSH or Secure Shell is protocol that provides secure remote access to network devices. SSH uses strong encryption algorithm for authentication. SSH version 2 is preferred than version 1 because version 2 provides more enhanced security algorithm. Telnet are not secured as they are vulnerable to Sniffing or MiTM attacks, they send data in clear text. (source: http://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/4145-ssh.html)
!!!SSH is network protocol operating at application layer (OSI level 7)... TCP, UDP is Transport Layer!!! Q: edited .
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