What is a fixed configuration router? And how has this feature been removed by introducing slot/port thing while configuring an interface?
Router(config)#int ethernet ?
<0-0> Ethernet interface number
Router(config)#int ethernet 0
The 2500 router, as previously demonstrated, is a fixed configuration router, which means that when you buy that model, you?re stuck with that physical configuration.To configure an interface, you always use the interface type number sequence, but the 2600, 3600, 4000, and 7000 series routers use a physical slot in the router, with a port number on the module plugged into that slot. So on a 2600 router, the configuration would be interface type slot/port, as seen here:
Router(config)#int fastethernet ?
<0-1> FastEthernet interface number
Router(config)#int fastethernet 0
% Incomplete command.
Router(config)#int fastethernet 0?
Router(config)#int fastethernet 0/?
<0-1> FastEthernet interface number
And make note of the fact that you can?t just type int fastethernet 0. You must type the full command: type slot/port, or int fastethernet 0/0, or int fa 0/0.
Thats a good question. I would rate you 4 points for that!
Actually, it works something like this:-
1. All applications work on Socket (Socket= IP Addr + Transport Protocol TCP/UDP + Port Number
2. All Servers (or services) do LISTEN on a specific port e.g. HTTP= TCP/80, HTTPS = TCP/443. SMTP=TCP/25 etc.
3. Whenever a client wants to talk to a server its will initiate the session To the server on the Service Port i.e. for SMTP=TCP/25 and the server would send the response back to the client on a 'high level' port number i.e. above the Service Port Numbers.
4. This all happens to a specific client and using a Socket (remember Socket = IP Add + TCP/UDP+ Port Number, hence for single client the IP Address would be unique, hence the Socket would be unique, hence the Server could respond to any number of clients with out issues.
And for clients, the request is sent to a particular IP Addr+ TCP/UDP + Port Number, and in this also, the IP Address would be different everytime, hence a client can initiate a session with any number of Servers!!
Morever, I know this might a bit difficult to understand in my terms, hence if you want a detailed explanation please visit
I hope this helps,
Please rate if it helps.
Please find below the 'comprehensive' Password Recovery link, and here you should get almost all Cisco Product's password recovery option.
However the point to be noticed is that, in every case you MUST HAVE CONSOLE ACCESS to the Router which is either a Direct Console Cable from your PC AND THE ROUTER/SWITCH MUST BE in the BootStrap Mode i.e. once it has completed the POST, you can't run the Password Recovery options!!
So, one can't access the Config / Change Password of a Cisco Router / Switch unless:
1. Reboots the Router
2. Issues the Password Recovery option (i.e. send Break from the Console)
Now, if someone has already got this, things can get much uglier than this... so this essentially not a Security Loophole.
I hope I was able to express my view, however please feel free to get back if there is anything else that still hits your mind. :-)
Hope that helps
Please rate if it helps,
A fixed configuration router (ex: 800 and 2500 series) is a non modular router, i.e a router that can't have more interfaces and modules, and accordingly a modular router is a router that have empty slots in order to have more interfaces installed on it (ex: 2600 and 3600).
From your example, when configuring a fixed router you use "int ethernet 0", while when you configure a modular router you use "int fastethernet 0/0" where the first 0 is the slot number where the interface was inserted into.
HTH, please do rate all helpful replies,