inter vlan routing

liven

How deeply is this covered on the 801 exam?

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liven

ok better yet,

is it covered on the exam???

bighornsheep

Yes

dtlokee

Know how to create subinterfaces, add the 802.1q encapsulation and VLAN id to them and the idea of the native VLAN and how it is handled by the router.

interface fastethernet 0/0
 ip address 192.168.1.1 255.255.255.0
!
interface fastethernet 0/0.2
 encapsulation dot1q 2
 ip address 192.168.2.1.255.255.255.0
!
interface fastethernet 0/0.3 
 encapsulation dot1q 3
 ip address 192.168.3.1 255.255.255.0

or somthing like this:

interface fastethernet 0/0.1
 encapsulation dot1q 1 native
 ip address 192.168.1.1 255.255.255.0
!
interface fastethernet 0/0.2
 encapsulation dot1q 2
 ip address 192.168.2.1.255.255.255.0
!
interface fastethernet 0/0.3 
 encapsulation dot1q 3
 ip address 192.168.3.1 255.255.255.0

That's about it. In th first example the physical interface is catching the native VLAN traffic (persumably VLAN 1) because i is untagged. In the second example there is a subinterface and the encapsulation command has the native keyword to denote this as the native VLAN (untagged interface)

liven

What is the default for the ccna exam?

Can we assume ip subnet zero is on or off?

dtlokee

ip subnet-zero is on, use all the available ranges unless the question states otherwise, or the answer choice is not there, for example:

if you subent a class c address using a 255.255.255.224 subnet mask, how many sunets have you created?
a. 1
b. 3
c. 6
d. 16

or somthing like that.

12beatechie

liven wrote:

What is the default for the ccna exam?

Can we assume ip subnet zero is on or off?

I would treat it as off unless specified in the question.

dtlokee

12beatechie wrote:

liven wrote:

What is the default for the ccna exam?

Can we assume ip subnet zero is on or off?

I would treat it as off unless specified in the question.

Sorry but this is wrong, the current version of the official courseware (which has been in print since October 2006) uses ip subet-zero on. You should use 2**s to calculate your subents and 2**h - 2 to calculate your hosts.

liven

dtlokee wrote:

12beatechie wrote:

liven wrote:

What is the default for the ccna exam?

Can we assume ip subnet zero is on or off?

I would treat it as off unless specified in the question.

Sorry but this is wrong, the current version of the official courseware (which has been in print since October 2006) uses ip subet-zero on. You should use 2**s to calculate your subents and 2**h - 2 to calculate your hosts.

I really appriciate the advice.

I am sitting the test on Nov5... Been studying like a mad man... I got a big lab at home, professional experience and have done lots of practice questions... Yet is difficult to cover everything and feel like I know it all backwards and forwards.

So I say thanks again!