: Cisco - 1
Cisco , / . , . / - . / , Telnet SSH, (enable), enable.
/ , .3.

, . console 0, Telnet, vty 0 15. , - " local."
:
- 1- username ulanbaby secret box
- 2- username landy secret box
, , -, , /. , , -username < > secret <>. , ( ) Telnet, login local. , " ."
no password, vty, .
:
1. username < > secret <>, / .
2. / :
- line con 0 .
- login local, , /.
- () no password , .
3. Telnet (vty) / :
- 1. line vty 0 15 vty 16 vty ( 0 15).
- 2. login local, Telnet, /.
- 3. () no password , .
Telnet , , , , 4. / . .

4 Cisco .
4 , , . , (configure terminal), (end). , (log). , (log) ; "ulanbaby".
/ , , . , , . , , , , .
, , . / , , , , , , .
Cisco , , , (authentication, authorization, and accounting)(AAA). / . AAA- .
/ .
AAA- ( ) AAA-, , , AAA- .
, / , AAA-, , , / .

, " " Telnet SSH SW1. "AAA" RADIUS TACACS+. , , , () .
, , . , Telnet SSH. AAA- RADIUS TACACS+, , .
SSHl
Telnet, SSH. Telnet : Telnet , . , , (man-in-the-middle attack), . SSH , SSH- , .
SSH , Telnet, . (SSH , , .)
, Telnet, , SSH.
, SSH. , (. ) Telnet. , SSH .

, SSH . SSH. SSH , :
- hostname sw-1 ( )
- ip domain-name testing.com ( sw-1.testing.com)
- crypto key generate rsa.
(, Telnet) :
username ulanbaby secret box username landy secret man line vty 0 15 login local
IOS : SSH, SSH. SSH . . 5 ( , ). , crypto key generate rsa, SSH. IOS SSH-. , IOS SSH- vty.
, , SSH. , , crypto key ; modulus modulus-value crypto key, . 5 ssh ( , . 5) .

, , SSH, Telnet vty. , Telnet , Telnet, .
, vty, transport input {all | none / telnet / ssh} vty vty :
- transport input all or transport input telnet ssh Telnet, SSH
- transport input none:
- transport input telnet: Telnet
- transport input ssh: SSH
SSH, Cisco SSH . ( SSH IOS ; .)
, , vty, .
1. , :
- , hostnamename .
- , ip domain-namename .
- crypto key generate rsa ( crypto key generate RSA modulus modulus-value, ) . ( 768- SSH 2.)
2. () ip ssh version 2 , SSH 1 2, SSHv2.
3. () , vty SSH Telnet.:
- transport input ssh vty, SSH.
- transport input all ( ) transport input telnet ssh vty, SSH, Telnet.
4. vty , .
Cisco transport input none. transport input line Telnet / SSH .
SSH . -, show ip ssh SSH-. show ssh SSH, . 6 , ULANBABY .
