What Subnet Sizes Should You Use in 2020?
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- čas přidán 25. 02. 2020
- For a limited time, I'm releasing some small pieces of the IT Expertise series available on CBTNuggets. By time you're done, you'll know a great way to determine which subnet sizes you can map to your internal VLANs.
For access to the entire series, click here: bit.ly/VLAN1
Links to Everything Jeremy: linktr.ee/cioarajeremy
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Keeping IT Simple
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You gave me the networking bug after watching your older ICND1/2 series and I haven't looked back. After learning from you I've become overall better in IT, not just networking. I put everyone I know onto your training that's interested in networking and they all love it. Thanks Jeremy!
These “nuggets” of info are awesome! Thank you so much!!
I remember waiting for this series to be released. I liked this one.
Loving these! More, more!
Thank you :)
Awesome video, reason and logic gotta love it.
Dude!! Thank you! This is awesome!
love this. Well explained
This is actually really good practical application. I've done stuff like this before in setting up new network, or making changes.
Jeremy, I really like how you teach, this explanation is so clear and fun also...Great Teach Jeremy...
You're the best- hats off
Subnetting is easy to me. I merely have to either figure out on my own or ask others how many users will need to be connected. Once I figure/find that out, then I can subnet easily and quickly based on that information.
Good material. Looking forward to the next installment, covering how you would do your IP addressing with respect to your VLAN numbers, as they don't necessarily line up with subnet masks.
For instance:
1. VLAN30, being a /22, provides 64 subnets of 1024 IP addresses, the third octet of each being a multiple of 4 (0, 4, 8, ..., 28, 32, ..., 248, 252). However since you used 30 as the VLAN number, this doesn't necessarily line up in any of those blocks (it falls between the /22 options of 28 and 32), unless you say that VLAN 30 will use all IP addresses (ranging 10.1.28.1 - 10.1.31.254) which does indeed include 10.1.30.0/24, but in design and in keeping with your "just add 1" philosophy is beginning to look like it steps into the VLAN20 range (as it uses what would be VLAN28 and VLAN29 IP addresses).
2. What happens when you want to expand your VLAN20 network?
- Expanding to VLAN21, VLAN22, or VLAN23 is fine - just change your mask to expand the range (10.1.20.0/22 would provide 10.1.20.1 - 10.1.23.254 so VLAN20, 21, 22, 23 are all okay).
- Expanding to VLAN24 would be an issue for two reasons:
a. Changing your mask from /22 (10.1.20.1 - 10.1.23.254) to /21 (10.1.16.1 - 10.1.23.254) does not have the desired effect of allowing you to use IP addresses in the 10.1.24.x range (for VLAN24) and is encroaching upon what would be the VLAN16, 17, 18, and 19 ranges, in keeping with design principles laid out before.
b. Changing your mask from /22 (10.1.20.1 - 10.1.23.254) to /20 (10.1.16.1 - 10.1.31.254) does allow you to use IP addresses in the 10.1.24.x range (for VLAN24) but in addition to stepping into the VLAN16-19 range (as described above), you are also now stepping into what would be the VLAN30 and VLAN31 range (10.1.30.1 - 10.1.31.254).
3. VLAN777 got no love in these videos; what's its intended purpose? Assuming it won't have any IP addresses, it's no better than VLAN1 (if not for just switching all of your switchports from VLAN1 to something else)?
Looking to see how you would tackle the whole issue. I assume COVID-19 threw this off of your radar, but hoping to see a follow-up.
Keep up the great work!
Hello. Have you learn anything about the new CCNA and is the actual exams in line with the new CBT CCNA course?
How to know VLAN number
How do VLAN and a subnets talk to each other
I want to know VLAN number than what can do
/64
True... ;-)
hmm.. not sure if I get the joke, wouldn't it be /0 if he covered everything? I get you are venturing off in v6 world too, which just a way of keeping it simple with a nice split in the middle of the network but what does that say about Jermey? I think he covered more then 50% of the network.