vty怎么用？

A network administrator needs to allow only one Telnet connection to a router. For anyone viewing the
confguration and issuing the show run command, the password for Telnet access should be encrypted.
Which set of commands will accomplish this task?
A. service password-encryption
access-list 1 permit 192.168.1.0 0.0.0.255
line vty 0 4
login
password cisco
access-class 1
B. enable password secret
line vty 0
login
password cisco
C. service password-encryption
line vty 1
login
password cisco
D. service password-encryption
line vty 0 4
login
password cisco
Correct Answer: C
Section: part 5
Explanation
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Explanation/Reference:
首先密码加密的命令为service password-encyption题目要求只能有一个人连接懂啊路由器.那么我们就开启
一个vty线路.然后设置password并且配置login就OK了