Shulou(Shulou.com)06/03 Report--

What is ssh?

SSH is an acronym for Secure Shel, developed by IETF's network team (Network Working Group); SSH is a security protocol based on the application layer. SSH is a reliable protocol designed to provide security for remote login sessions and other network services. The use of SSH protocol can effectively prevent information leakage in the process of remote management.

Secure Shell, protocol function: data can be encrypted in the network to achieve: openssh client: openssh-client server: openssh port: 22

Implementation: dropbeartelnet plaintext client: telnet server: telnet-server port: 23 by default, it is forbidden to use root to log in to the system using telnet to use telnet in the production environment. Test whether the designated port of the target host can communicate normally, that is, whether the designated port of the target host is open (determine whether the service is open by the port).

Process

Daemon: a service maintains a process, allowing the process to work in the background. Each process has its own service. The service service name is start | stop... Manage super daemons: a service maintains multiple processes xinetd transient daemons: the child processes managed by super daemons are transient daemons telnet instantaneous processes do not have their own services, and their startup and management depend on xinetd

Ssh

Telnet scp summary: ssh function 1, remote login 2, remote file transfer 3, file transfer function similar to ftp, sftpssh client and server ssh security ssh v1

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