Cisco - Futuristic Training Video for Subnetting

[benghaith]

This video likes a reality TV but specific to networking engineering!! Cool! Where can we have more videos like this? Or what is the movie name...

[garffff]

Hang a sec, and someone please correct me if im wrong as im still learning. A subnet of 224 at the end creates 31 useable IP (minus 1 for the broadcast address?

[shinkuuz]

255.255.255.224 creates 30 usable host IP. 2^5 = 32 - 2 (network and broadcast address)

The video mentions 6 subnets instead of 8 subnets. RFC 1812 allows subnets of all 0s and all 1s. Some host and intermediary devices may not support all 0s and 1s.

[sandydragon69]

awesome... just love the way they practically implement it.. cool.. :) makes subnetting fun ....

[rrmmstein2003]

how did these network admin's get their jobs anyway if they dont even know how to subnet?

[locust76]

That's what I was wondering... I guess that's what happens when you hire a "nanotechnologist" and make him a network admin...

[tomstorey]

I sure hope this video isnt used for training any more. For one they still talk about classfull addressing which is now obsolete, and secondly while they dont actually say it, they also use the "subnet zero" rule, hence the reason they start assigning addresses from 192.168.100.32/27, rather than 192.168.100.0/27. Subnet zero is also obsolete and is a waste of IPs.

And not to mention they screwed up with the subnet mask.

[edvixen]

omg this was so cute x3 *fave*

[evaldaz]

I'd say that 3 bits from the host portion creates 8 usable subnets (not 6).

and don't argue with me about this, I know the stuff about all zeros or all ones.

[fcosgraf]

U can`t use the first part because that correspond to the network ip address (the one who ends with a 0) and can`t also use the last portion of the divided network because that one correspond to the broadcast network address (255).

[locust76]

In binary, 111 (3 bits) gives 7, and when you take into account 000, you do get a total of 8 individual values, and thus 8 individual subnets. I don't know why people voted your post down...

[garffff]

Yes you are right, it does create 8 usable subnets. I'm new at subneting and I had to get my pen and paper out to figure it out.

[blade004]

The video is a bit of wank and starts like a porno but good nonetheless :)

[rxbyte]

This vid is epic fail....!

[willandjas]

They have it wrong. 225 mask

[arm4life87]

if you read the info for the video, it was made with errors on purpose for students to point out on a quiz.

[willandjas]

Why in the hell are they using a 225 mask?

[amdo2008dragon]

hats off , make subnetting easy , more videos like this plzzzzzzzzzzzzzzzzzzz

cool videosssssssssssssssssssssssss­s

[VegasRage]

A mask of 225!? DOH! That is one Swiss cheese holey mask. When was the last time you saw a mask defining the network that looked like 11100001 in binary.

ROLMO! You could drive a car through that. Ah what fun.

[rulestein]

developers do all the work anyway

[darkling21]

that's the subnetting by the book :p

and yet they say that there are some built in errors... maybe they made errors on filming this and said that it was done on "purpose" :D

[poisomike87]

Very cheesy but good :)

[ncliju]

the subnet is 255.255.255.224 .. but in video its mentiond 225.225.225.0 (First octect is mentioned 225 instead of 255)

[rathanger]

Nerds...

[HazardousSmoker]

Don't be jealous.

[brainrain]

The corrections /lessons are done. it's in a /27 subnet so the subnet is 255.255.255.224

[kyoujinrigon]

Nice... but it needs correction

the subnet mask 225.225.225.0 is wrong

it should be 255.255.255.0

so much work with a video and a beginner's mistake.

its a shame.

[sfedward]

Funny, nice you caught it. It was actually built in. The video is part of a flash shell where there are some built in errors the viewer has to find for a quiz at the end. I couldn't get the whole flash piece in for youtube.