SSH
From Linuxhelp Wiki
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| Application layer | HTTP, SMTP, FTP, SSH, IRC, etc. |
| Transport layer | TCP, UDP, SCTP, RTP, DCCP, etc. |
| Network layer | IPv4, IPv6, ARP, ICMP, etc. |
| Data Link Layer | Ethernet, 802.11a/b/g WiFi, Token ring, FDDI, etc. |
SSH (Secure SHell) is both an application and a protocol which is used to log in remotely to a computer or server. SSH provides encrypted communications between two computers and is intended to replace insecure predecessors like telnet, rlogin and rsh.
More popular SSH servers and clients:
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