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Basic Networking

Posted on 2003-12-10
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Last Modified: 2010-03-19
hi to all,

I have started preparing for CCNA and got many doubts will reading ... few are....

1. Say Two routers connect each other with a ethernet interface

At one router , i have enable rip , network 172.16.20.0
another one , i have enable igrp 100, network 172.16.20.0

Will the routing take place?
what is the 100(autonomous no) mean in igrp

2. What is auto config IP means(169.x.x.x)

I found that if there is no DHCP server or a static address set on an adapter , the adapter provides the auto config IP address

Does it mean that the adapter works fine?

If i connect two computer with a cross-over cable and each of them gets an auto config IP address - will it able to ping the other computer with the auto config IP address? i dont think so

In this case - i feel the whole 169 subnet is wasted.Isn't it?

3. What is 1394 NET adapter that gets loaded in WinXP? i found that it's something to do with firewire - but is it physical connector found on the back of the computer?

4. WAN MIN port - Gets installed when we install a Network adapter? what does this mean?( i seached on the web - but didn't understand)





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Question by:Ace_ravi
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Expert Comment

by:orbix
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Hi,
 
> 1. Say Two routers connect each other with a ethernet interface

Two routers can be connected VIA Ethernet, if directly to each other, cross over cable would be needed.

> At one router , i have enable rip , network 172.16.20.0
> another one , i have enable igrp 100, network 172.16.20.0

> Will the routing take place?
If I understand this correctly, interface on Router 1 = 172.16.20.x, and Router 2 = 172.16.20.x, and are directly connected, same network (depending on mask used, ((not given)) ) no routing. Routing would take place between interfaces on the same router differnt networks, example, Router 1 Ethernet Interface 127.16.20.x/16, and between Router 1, Serial Interface 192.168.1.x/24.

> what is the 100(autonomous no) mean in igrp
100 would be the routing process ID#

> 2. What is auto config IP means(169.x.x.x)
> I found that if there is no DHCP server or a static address set on an
> adapter , the adapter provides the auto config IP address

Most NIC’s are setup for Autoconfig, meaning if no static IP entered, or no DHCP server found, the NIC will auto configure with a 169.254.x.x address. Basically if two or more machines are connected together in a network, they should be able to communicate with each other. The chance of two machines getting the same address are slim.

> Does it mean that the adapter works fine?

> If i connect two computer with a cross-over cable and each of them gets > an auto config IP address - will it able to ping the other computer with
> the auto config IP address? i dont think so

They should be able to

> 3. What is 1394 NET adapter that gets loaded in WinXP? i found that it's
> something to do with firewire - but is it physical connector found on the > back of the computer?

1394 indicates a Firewire port/adapter


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Author Comment

by:Ace_ravi
Comment Utility
1. Say Two routers connect each other with a ethernet interface

Two routers can be connected VIA Ethernet, if directly to each other, cross over cable would be needed.

> At one router , i have enable rip , network 172.16.20.0
> another one , i have enable igrp 100, network 172.16.20.0

> Will the routing take place?
If I understand this correctly, interface on Router 1 = 172.16.20.x, and Router 2 = 172.16.20.x, and are directly connected, same network (depending on mask used, ((not given)) ) no routing. Routing would take place between interfaces on the same router differnt networks, example, Router 1 Ethernet Interface 127.16.20.x/16, and between Router 1, Serial Interface 192.168.1.x/24.

I will make myself more clear -

Interface e0 of router1 and interface e1 on router 2 are connected to each other.

e0 - 172.16.20.1 / 24
e1 - 172.16.20.2 / 24

router 1
#config terminal
# router rip
#network 172.16.20.0

router2
#config terminal
# router igrp
# network 172.16.20.0 100

what will happen now ? will the routing tables gets updated on both the routers?
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Accepted Solution

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orbix earned 125 total points
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> Interface e0 of router1 and interface e1 on router 2 are connected to
> each other.

> e0 - 172.16.20.1 / 24
> e1 - 172.16.20.2 / 24

> router 1
> #config terminal
> # router rip
> #network 172.16.20.0

> router2
> #config terminal
> # router igrp
> # network 172.16.20.0 100

> what will happen now ? will the routing tables gets updated on both the > routers?

Both of those interfaces are on the same network, they can communicate with each other, no routing.

Routing would take place between interfaces on the router, each interface being on a differnt network, Router 1 Ethernet Interface 127.16.20.x/16, and between Router 1, Serial Interface 192.168.1.x/24.

Int Ethernet 0
IP Address 172.16.20.1 255.255.0.0
no shutdown

Int Serial 0
IP Address 192.168.1.1 255.255.255.0
no shutdown

Router RIP
network 172.16.0.0
network 192.168.1.0

When routing, for routing tables to be updated, you would need the same protocol on both systems,
Example Router 1 = RIP, and Router 2 = RIP. If using differnt routing protocols as listed above,
you would need to redistribute one into the other for updates to occure.


Orbix
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