Cisco - Futuristic Training Video for Subnetting

Video created to teach students the basics of subnetting on the Internet. FYI, there are some built in errors that are part of an accompanying Flash shell students have to catch for a quiz.

Category:

Howto & Style

Tags:

• futuristic
• technology
• training
• video
• subnet
• effects
• internet
• networking
• scifi
• science
• fiction
• leaning
• e-learning
• cisco

[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.

[arm4life87]

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

[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...

[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.

[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.

[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?

[sandydragon69]

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

[locust76]

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

[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...

[rrmmstein2003]

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

[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).

[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.