I used to revise subnnetting everyday for atleast 30 -45 mins a month or so ago, and i feel i am quite good at it. Since revising routing protocols though ive not spent so much time soley concentrating on it though.

My question is in the exam when you get the oportunity to write on a piece of paper, many people say you can write down the subnets and create a sort of CHEAT sheet and use it in the exam when doing subnetting.

Now my first question is... is this true???

and secondly is it useful? or am i best not wasting time and just continue learning my subnetting my way so i can do the working out in my head?

Thanks

You will get something to write on and a pen. At the places I've gone to they give a dry erase marker and a laminated piece of paper. I'm guessing that is a testing standard from Vue. In my opinion though if you have time to be writing then you are completely lost, confused, and in need of some more study or you were so damn good you finished early and decided to draw pictures. When I took it I told myself a minute or less for each question so that I had time for the sims. It paid off

I totally wrote down the major blocks at the start of my ICND1 and 2 exams so that, if I felt like the pressure was on, I wasn't going to crack trying to remember what the 4-tuple sequence for, say, a 28-bit subnet mask was. Turned out that I didn't need it, but I was glad to spend the minute or two at the start putting it down in front of me 'just in case'.

What do you mean by "4-tuple sequence"?

i actually started writing everything i needed down before clicking the start button(before the exam demo).

I made a subnet chart, practiced every day writing it down, so I could write it quickly, like in 30 seconds.

_________________
"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw

Thanks Guys,

I'll practice my subnet charts then any ideas of ones i can right down quickly and are useful in every area?

Thanks

the one I like is

first write down an octet in bits like this:

128 64 32 16 8 4 2 (exclude 1 and 2)

then underneath it write it backwards

2 4 8 16 32 64 128

make sure 16 and 16 line up.

the top is the available hosts
the bottom are the subnets

128, 64, 32, 16 8, 4 (-2 for available hosts)
2, 4 8 16 32 64 total subnets


then I write above 128 /25, /26,/27 etc

then at the bottom I write the masks

128, 192, 224, 240, 248, 252 so for a /28 you can see that its 16 and 16 or 14 and 16, and the mask is 255.255.255.240

hope this helps (and makes sense)

_________________
CCNA, CCDA, CCNA-SECURITY

thanks gonna start doing the questions now with this table,

Best bet is to do it in your head. I've finally gotten to that point, and although its obviously better to be safe and get it right on the exam, you should probably use a chart anyway like kerpap said above. Matter fact, I just jotted it down because I have an upcoming exam

You have plenty of time before the exam ever starts to write down anything you want. You could take 10 minutes writing stuff down if you wanted to. Just do it all before you hit the "Start the exam" button or whatever it's labeled.