IPv4 Subnetting Practice for the CCNA

In this example, given an IPv4 address and subnet mask you answer the following questions:

1. What is the magic number?

2. Is it a host, network, or broadcast address?

3. What is the subnet mask in slash notation?

4. What is the network address?

5. What is the broadcast address?

6. What is the first usable host address?

7. What is the last usable host address?

8. How many usable hosts in the network?

9. What is the next available network address?

This practice is designed to help you be successful on a Cisco CCNA exam.

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[juliorojas]

After a couple of days trying to understand subnetting, your videos finally drilled it in and solidify my understanding. Again it took a couple of days of watching videos, but the ones that finally turned on the light bulb was yours. Thank you.

[fullsaildigital]

this is the best explanation I have ever seen, after countless videos and books, watching this just clicks. well, done. Makes me, wish I could take your class at the college.

[martyg]

Dan, you are the man. I did not get professor messer's explanation at all; ;yours is much, much easier and quicker. Thank you thank you thank you.

[mantid]

I was a little off figuring it out but cleared it all up as you provided the answers. Thank you!

[Thecody]

Wow. This is perfect. This old school 9yr video is amazing!

[Bolsh_]

Thanks Dan! It was so hard to find a good review video to watch that made sense to me. Your work is appreciated

[DaffyAF]

This is the best Subnet crash course I've ever seen. Than Dan!!

[whocares]

This is the best explanation on subnetting I have seen. Like others have said, after many videos on subnetting.

Thanks.

[stefanolivas]

Watched your videos on how to subnet (1-6) and it made these subnetting questions seem like child's play. Thank you so much simplifying subnetting for me!

[peraruor]

Masterly! I have seen many videos about subnetting, but it turns out that the simplest is the best! Thank you very much for this video. As you say, it is very easy to understand subnetting with your explanation! I don't need to watch another subnetting video. Thank for saving me hours of study. Excellent explanation! Thanks!

[MadBadgerCR]

firts 56 seconds of this video and I had my doubt solved. Thanks man!

[stevie]

Wow! I've been trying to practice subnetting for my Network+ exam and your process helped quite a bit. Thank you so much!!!

[paweltulik]

Wow, after 2 failed ICND1 exams (stupid 30 points missing each time) I think I get it now, thank you for this video

[eddiechen]

Thank you, it’s easy to understand through your clear and detailed explanation, helps a lot!

[marielac]

Thank you! You've explained it best. Loved the "magic number".

[isharafernando]

Im sure you made eveyones life easier Dan Thnx!

[yankessnperu]

OH MAN! The light bulb just came on.. Thanks!!!

[BuzzNation]

this video explaining subnetting is awesome. Magic number is blowing my mind. great learning tatic for newbs like me.

[agfagaevart]

Exactly the video I've been looking for. Well explained!

[lanceintj]

Subnetting simplified. I like this technique.