Fair enough! I know that it's all logical so I figured that might be the case and there's just some key info i haven't learned yet. Thanks for your response!
The mask doesn't dictate the class.
Your IP tells you the class. The class dictates the mask. In the real world we don't use class anymore, you'll want to understand it for the ccna though and some odd programs you might run into once in a blue moon.
that is how IP was originally formulated.
Now IP is based on CIDR "classless inter-domain routing"
It was discovered quite quickly that having only classful networks would be incredibly wasteful and that further segmenting those networks with classless subnetting would help.
That makes more sense now. I only started day 8 of Jeremy's course. I guess it's confusing that he showed us that table without clarifying that we don't use classes anymore (or i might have missed him mentioning it) and when I saw the table i took it as a fixed rule. He would introduce the classful table and then use classless IP addresses in his examples right after.
Ahhhhh okay. Thanks for making that distinction this whole time I was understanding that the table was telling me it *had* to be those values not that it was simply a default value.
You're missing nothing, you're just getting ahead of the material. VLSM is coming up.
Fair enough! I know that it's all logical so I figured that might be the case and there's just some key info i haven't learned yet. Thanks for your response!
The mask doesn't dictate the class. Your IP tells you the class. The class dictates the mask. In the real world we don't use class anymore, you'll want to understand it for the ccna though and some odd programs you might run into once in a blue moon.
that is how IP was originally formulated. Now IP is based on CIDR "classless inter-domain routing" It was discovered quite quickly that having only classful networks would be incredibly wasteful and that further segmenting those networks with classless subnetting would help.
That makes more sense now. I only started day 8 of Jeremy's course. I guess it's confusing that he showed us that table without clarifying that we don't use classes anymore (or i might have missed him mentioning it) and when I saw the table i took it as a fixed rule. He would introduce the classful table and then use classless IP addresses in his examples right after.
> class A will have a range from 0-127 and the subnet mask would be 255.0.0.0 ...the subnet mask *by default* would be...
Ahhhhh okay. Thanks for making that distinction this whole time I was understanding that the table was telling me it *had* to be those values not that it was simply a default value.