Cisco Configuration

What is the meaning in Cisco switch ? For line vty,  is it a telnet  session ? Does it mean 0 - 4 will ask for password while 5 - 15 doesn't ?  Tks

line vty 0 4
 password 7 095F5D1D58541844315D52
 login
line vty 5 15
 login
AXISHKAsked:
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Kaiser AnwarCommented:
That is correct - little info

The VTY lines are the Virtual Terminal lines of the router, used solely to control inbound Telnet connections. They are virtual, in the sense that they are a function of software - there is no hardware associated with them. They appear in the configuration as line vty 0 4.
Each of these types of lines can be configured with password protection. Lines can be configured to use one password for all users, or for user-specific passwords. User-specific passwords can be configured locally on the router, or you can use an authentication server to provide authentication.
There is no prohibition against configuring different lines with different types of password protection. It is, in fact, common to see routers with a single password for the console and user-specific passwords for other inbound connections.
Below is an example of router output from the show running-config command:
2509#show running-config
Building configuration...

Current configuration : 655 bytes
!
version 12.2
.
.
.

!--- Configuration edited for brevity


line con 0
line 1 8
line aux 0
line vty 0 4
!
end

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AXISHKAuthor Commented:
The switch supports 16 concurrent telnet session. Only first 5 connection will ask for password. For the remaining, no password is needed ?? If yes, I believe there is some security hole left in previous configuration.  

Tks
AlexBlinovCommented:
If you don't have configuration for the "line vty 5 15" - than there is no security hole. Rest of the virtual lines simply not enabled.
AXISHKAuthor Commented:
Tks
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