Do I understand Subnetting? (CCNA Quiz Tommarow)

[Tab]

Lets say the IP # Number is 192.168.203.? and I want to have 6 networks.. (This would be finding the subnet? )

To do that I use this chart

7 6 5 4 3 2 1 0
2 2 2 2 2 2 2 2
128 64 32 16 8 4 2 1
192 244 240 (and so on to 255, I am not going to bother typing this but you get the point )

I want 6 networks so I goto 8.........

Yea I just confused my self..

Anyway, I am stuck......Thought I knew what I was doing or paper and pen is easier to understand than the screen.

Two other questions...

BroadCast is the Next Network -1

Gateway is the current network -1

Whats this about how Cisco ask werid questions, what are the avaiable IPs for such and such devices vs computers? The consider a router a device? If it was just computers then....yea confused my self again

 

[exx1976]

I have NO idea what that little chart is you drew out there, but...

The broadcast address is always the LAST address in the current network. For instance, if your IP is 192.168.1.2, and the netmask is 255.255.255.0, the broadcast address FOR THAT NETWORK is 192.168.1.255. The gateway address? I'm not sure I understand what you mean there.. The NETWORK address for the above example would be 192.168.1.0. Some people write subnets like this, too: 192.168.1/24 the /24 signifies that the first 24 bits of the netmask are 1's, hence 255.255.255.0..

I used to have a real nice chart around here for figuring out subnets, but now I just cheat and use a program.. LOL

 

[Genx87]

Subnetting is the toughest thing to remember how to do correctly hehe. I just use a subnet calculator now

Anywho if I remember correctly you take 2 to the power of the number of subnets you need. So if you need 6 usable subnets you will use 2^3 which equals 8. 255/8 = 32 nodes per subnet.

So you throw out the first subnet which is 192.168.1.0-32 and the last which is 192.168.1.223-255. This is how they do it whenever you subnet. You gain flexibility but lose two entire networks.

Your usable range will be 192.168.1.34-221 I believe. Remember in each subnet I think you have to throw out the 1st and last network address because they are the network and broadcast of the subnet.

Now if I were you I would greatly verify what I just said because chances are it isnt totally correct.

Broadcast is always the last address in the network. Gateway can be anything you set the router to. For simplicity it is usually the first address in the network but it doesnt have to be.

 

[suklee]

Good luck on that test and let us know how you did! :beer:

 

[suklee]

Well, how'd it go? :music:

 

[suklee]

WHOOPS... dam DP

 

[JackBurton]

Man, I wish all the CCNA test was subnetting. I'd b!tch slap that test.