You can connect to a Cisco router to configure it, verify
its configuration, and check statistics. There are different ways to connect to
a cisco router. The first one is through the console port. The console port is
usually an RJ-45 (8pins modular) connection located at the back of the router –
by default, there may or maybe not be a password set. The new ISR (Integrated
Service Router) routers use cisco as the username and cisco as the password by
default.
You can also connect to a cisco router through an auxiliary
port which is really the same thing as a console port, so it follows, that you
can use it as one. But an auxiliary port also allows you to configure modem
commands so that a modem can be connected to the router. Its let you dial up a
remote router and attach to the auxiliary port if the router is down and you
need to configure it out-of-band (meaning out of the network)
The third way to connect to a cisco router is in-band,
through the program Telnet. (In-band meaning configuring the router through the
network, the opposite of out-of-band) Telnet is a terminal emulation program
that acts as though it’s a dumb terminal. You can use Telnet to connect to any
active interface on a router, such as an Ethernet or serial port.
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