I saw a linux video coure, telling that SSH is better, but I found telnet is default.
telnet is extremely obsolete and using it opens your system wide open to being hacked. This is not the 1990's or early 2000's.
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Quoteaptitude show telnet
Package: telnet
Version: 0.17-41.2
State: not installed (configuration files remain)
Priority: standard
Section: net
Maintainer: Mats Erik Andersson <mats.andersson@gisladisker.se>
Architecture: amd64
Uncompressed Size: 167 k
Depends: netbase, libc6 (>= 2.15), libgcc1 (>= 1:3.0), libstdc++6 (>= 5)
Replaces: netstd
Provides: telnet-client
Description: basic telnet client
The telnet command is used for interactive communication with another host using the TELNET protocol.
For the purpose of remote login, the present client executable should be depreciated in favour of an ssh-client, or in some cases with variants like telnet-ssl or Kerberized TELNET clients. The most important
reason is that this implementation exchanges user name and password in clear text.
On the other hand, the present program does satisfy common use cases of network diagnostics, like protocol testing of SMTP services, so it can become handy enough.
Tags: admin::login, interface::shell, network::client, protocol::ipv6, protocol::telnet, role::program, uitoolkit::ncurses, use::login
OK, telnet was substituded by SSH .