VLSM

Good Day

I have quries regarding the concept of variable lenght subnet mask, in particular when any particular Ip address is put /and then number such as 10.1.2.0/24 (what is that about)

Can someone please enlighten me this idea before booking my exam?

Many Thanks Guys/Girls

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Comments

gravyjoe

I doubt that you'll have to know about VLSM for the 270. VLSM would be good to know to get your CCNA though.

dynamik

He might have just posted in the wrong forum too.

That's not necessarily VLSM. It's CIDR notation. It just means there's 24 bits in the subnet mask, so /24 is equivalent to 255.255.255.0 or 11111111.11111111.11111111.00000000.

RobertKaucher

dynamik wrote:

He might have just posted in the wrong forum too.

That's not necessarily VLSM. It's CIDR notation. It just means there's 24 bits in the subnet mask, so /24 is equivalent to 255.255.255.0 or 11111111.11111111.11111111.00000000.

Just to go a bit further with dynamik's explanation: 1111 1111.1111 1111.1111 1111.0000 0000 is 24 1s, so a 24 bit subnet mask. 1111 1111 in binary is 255. So 255.255.255.0 is the human (decimal) form for 11111111.11111111.11111111.00000000

I did see one "VLSM" question on my 270. It was not a true VLSM question, just had to know what the correct subnet mask was based upon a diagram and the output of IPCONFIG /ALL.