Seven Second Subnetting - CompTIA Network+ N10-009 - 1.7

[@NXu-tv7gl]

Hey guys here is a tip for getting the eight decimal mask values for the cidr notations (chart at 2:41) if you are having trouble memorizing the decimal mask. Start with the 8 bit decimal values: 128 64 32 16 8 4 2 1. Next starting from the top, add the previous sum to the current bit decimal value going from left to right. Use 0 for the first value since there isn't a previous sum. 0 + 128 = 128 128 + 64 = 192 192 + 32 = 224 224 + 16 = 240 240 + 8 = 248 248 + 4 = 252 252 + 2 = 254 254 + 1 = 255 Hopefully this helps.

[@bobmarlyy3]

Thanks man I also figured this out myself while trying to memorize this! This is a big help

[@catalaojr]

Ok, this 7-second is definitely the go-to, once you're comfortable laying down the chart and using it, the job is easy.

[@StriderRyu7]

As someone studying for the CCNA,I hope this helps me process subnetting. It feels very daunting,at times.

[@StriderRyu7]

@@SlyPstmn Thanks for the input,man! Really appreciated.

[@zarrinteractive6077]

@@SlyPstmn are charts allowed on during testing?

[@domokunist]

I use a hybrid method, combining the Magic Number method and the 7-Second method. I still calculate the Magic Number myself, but I use a chart for the CIDR notation conversion. I found this to be easier as I dont have to worry TOO much about memorizing a huge table.

[@Michaelangilo-b8h]

studying for CCNA and still relying on prof Messer lolol. You the greatest!

[@kilroy79763]

Thanks for the video - as always FANTASTIC!!! I will be using it for sure

[@Michaelangilo-b8h]

bringing your own FINE TIP marker is actually a great idea, as the markers they provide are usually worn down. Thanks for looking out!

[@stevens1041]

This is an amazing resource. Thank you.

[@PurplePanda1233]

Gonna borrow this for my CCNA next month lol

[@nivedpiduri2480]

Is this the last video in the network+ playlist?

[@stevens1041]

I doubt it. I'm trying to remember the ones he made for the previous Network+ exam--over 100 videos. Uploads are phased in.

[@TackyTuber]

good luck drawing this during ccna exam lol

[@professormesser]

This video describes the exact shortcut I used for my Cisco exam.