@wrcombs said in Subnetting:

@scottalanmiller said in Subnetting:

@wrcombs said in Subnetting:

but when the questions are "you need 4 networks which subnet mask would you use on this ip: 10.1.1.25"

That's gibberish. There's no way to know based on what is stated.

I probably missed the actual question.. but questions similar to that confuse me.

It's all math and high school style word problems. It's all about "to meet the requirements", what options would you choose so that the sizes are correct.

@Dashrender said in IPv6 Subnet Masks - CompTIA Network+ N10-007 Prof. Messer:

It's absolutely true that IPv6 gives us billions and billions of small networks worth of IPs(each of those smalls being likely larger than the full IPv4)

Right, both are just a flexible pool. One is just way, way bigger.

@scottalanmiller exactly what I was looking for!

@Dashrender said in Classful Subnetting - CompTIA Network+ N10-007 Prof. Messer:

they aren't something that's really in use anymore,

Since the 90's......
CIDR was introduced in 1993
https://en.wikipedia.org/wiki/Classful_network

By default, traffic will pass between VLANs 1 & 2, unless you go into the firewall & add rules to deny traffic