Welcome to my introduction to networking
course, typically abbreviated
ITN. This will be for the CCNA version 7
curriculum module 10 is about basic
router
configuration. So in this module, we're
looking at how to configure basic router
settings looking at the interfaces and
setting up the default gateways on
device.
So let's jump right on in configuring
the initial router settings, just like a
switch we uh jump in. We configure a host
name from the global configuration,
you'll notice that will be the device
name and we'll have config in
Brackets. From there, we will be typing in
host name space whatever the name, you
want it to be if we want to enable a
password.
This is what secures the privileged EXA
mode that is created by the enable
section what you would do is enable
secret and then put whatever password
you
want. If we want to secure the user exact
mode, when we console in or if we're
using a virtual
terminal. We would then set up either a
line console zero or a line vty
BTY are the virtual
Terminals and from there, you'd be
setting a password using the password
space whatever the password. You want it
to be and then you also want to say when
do you want it to prompt the user and we
want the users to be prompted at login.
So the second line would be
login with a line vty, you can
also have uh specific
inputs that are required. You could do a
secure shell SSH or you can allow tet or
both keep in mind tnet everything is
still plain text. SSH everything is
encrypted but additional setup is needed.
When we're doing
SSH with the enable and the password, you
can actually set an enable password
without using secret. However secret
actually hashes the password, you'll
notice with the line connection line
console and line vty both the passwords
are using just a plain text password. We
can encrypt the password by enabling the
service for password encryption to do
that we type service password encryption
that will encrypt our passwords.
Lastly, we need to set a banner. A banner
is going to be a message that will be
displayed when the user logs in. You do
that by typing Banner motd, that is short
form message of the day a special
character write the message and you have
to end with the same special character.
You cannot use different starting and
different special characters. They have
to be the
same. So how does that look in
practice here? We have a host name R1 we
have a a password of class for our line
password. We have a password of
Cisco. Those will all be plain text,
except for the enable password until we
turn on the services that encrypt our
passwords. And then lastly, we have our
Banner message
and to make sure we understand this, we
have a packet tracer lab. Moving on, how
do we configure the interfaces routers
and switches have multiple interfaces? So
first of all, we need to know what they
are you could do a show IP interface
brief and that will show us the
interfaces that has to be done at the
privilege exec mode, just the pound sign
show IP interface brief will give you
all of the
interfaces. Once you know how many
interfaces you have, you can configure
those interfaces you configure the
interface by doing
interface the type and number of the
interface. You can list a description if
you'd like. You have the ability to give
it an ipv4 and or an IPv6 address and
you should turn on the interface with a
no shutdown. A shutdown command turns off
the interface. No shutdown activates the
interface. So in real practice if we are
programming the gig z0000
interface that would be the gigabit
interface on the Lan
side. That is how we would do it. We would
give the IP
address. We should give a description so
we know what it
is and we should turn it on. In this
example, we're also enabling an IPv6
address if we wanted to configure, the
gigabit 001 interface. We could do that
as well that is the link between R1 and
R2. Hence the description, we give it an
IP address. We give an IPv6 address and
we also say no shutdown to turn it on.
So how do we verify these interfaces are
up and running show IP interface
brief as long as the okay is yes, and the
status is yes or up. We are good if the
status is set to administratively down
that means that we didn't issue. The no
shutdown command if the protocol is down,
but the status is not administratively
down. It is typically a layer one issue, a
physical networking
issue. If you want to look at the IPv6
version. You would do a show IPv6
interface brief, and that will give you
the IPv6 equivalent of the interface
brief
communication, all right. So how do we
look at certain commands show commands.
Specifically, if we're looking at
interfaces,
show IP interface brief is going to be
the most common. If we're looking at
routing information, it'll be show IP
route, we could look at detailed
information by looking at show
interfaces or show IP
interfaces. Those will give us very
specific statistics on those
interfaces. All of these have a IPv6
equivalent command as
well. So going back, here's how we would
do our show IP interface brief. Again, it
is important to realize these are our
basic, show commands for our verification
for interfaces. If we are doing a route,
if we're looking for routing information,
show IP route we will actually show
better breakdowns of these tables in a
later
lecture, but this is how a routing table
looks. This is what the router will use
to make the routing decisions. It will
use this table to figure out how to
forward packets
appropriately show interfaces. You can
show all interfaces or you can be
specific on one interface, this will give
you a detailed breakdown of that
interface the MAC address the IP address.
The MTU, the reliability, the transmit and
receive load. If there is ARP information,
if there's anything being queried. If
there's anything being overloaded, this
is what's going to tell
you show IP interface will also give you
the uh interface. If it's up, if the blind
protocol is up, this will give you more
detailed on specific functionality.
Notice this does not give you
reliability or transmit and receive
loads.
So show interface will give you transmit
and receive loads, show IP interface will
give you specific on protocol
functionality again. There's IP
equivalent for IPv6 show IPv6 interface,
we show you if it's up, if it's down and
if there's any multicast groups
associated with it. And then the rest
will be protocols.
Moving on, how do we configure an
ipv for default
gateway. Remember the default gateway is
the exit out of our
landan. So here we have two interfaces on
the router gig 000000 and gig
001, if we actually want two different
networks. We could do that one network on
gig 0000 one network on gig
001, and to communicate between these two
networks, it has to go to a layer 3
device. The layer 3 device is going to be
our router and again the default gateway
is our exit point for our Network. Again,
it's going to be the
router switches must have a default
gateway. If they're going to be remotely
managed at all, the switches should be
able to pass frames to the router,
assuming the in device is actually
sending it to remote
host. The switch should also have a
default gateway, just in case the switch
is not sure how to forward it
on how do we configure an IP default
gateway. On a switch from the global
configuration, we issue a
IP default gateway command and that is
IP default gateway space. The IP address
of the
Gateway. For whatever reason, we have a
bug in our PowerPoints. That list
the graphic not being completed as of
yet,
we do have a packet tracer on looking at
router information configuring the
router and verifying the
configuration. We also have another
Packet Tracer at looking at verifying
Network documentation, implementing
Solutions and testing and verifying
certain problems, looking at the default
gateway. And that is it for this
chapter. There are videos if you wish to
view them in nead
overall. We also do have another lab
looking at basic device configuration,
both a router and a
switch. We also have a basic U lab
setting up again switch and a router
setting up basic uh device functionality
host name Banner enable things of that
nature all right. So summary, what did we
learn we looked at how to navigate
between user and exec mode and Global
configuration mode?
We looked at basic configuration how to
set a host name how to set an enable
password, how to set line passwords, how
to set a banner we also looked at how to
set interfaces basic configuration for
interfaces, and how to turn them on again.
We turn them on with a no shutdown
command. We also looked at how to set a
default gateway and the purpose of a
default gateway. Any questions or
concerns, please reach out. Thank you.