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The answers:

1. Hex value aC4 into decimal

This means we have...

"a" units of 256

"c" units of 16

"4" units of 1

In hex, "a" is 10 and "c" = 12. Therefore, we have ....

10 units of 256 = 2560

12 units of 16 = 192

4 units of 1 = 1

Add them up and you get 2756.

By the way, get used to doing these conversions and additions by hand -- you can't use the Windows calculator in the exam room.

2. Decimal 1092 into hex

First question: Are there units of 256 in this value? Sure, there are actually four of them...

4 x 256 = 1024

Subtract that from 1092 and we have 68 left. Are there units of 16 in 68? Sure, there are 4 of those as well.

4 x 16 = 64

That leaves us 4, which is four units of 1.

Our hex value: 444

3. Binary string 00110010 into decimal

Going from left to right, the following bits are set to one -- 32, 16, and 2. Add them up and you have 50.

4. Binary string 11001101 into hex

A little more work is needed here, but not much. ;)

These bits are set to one: 128, 64, 8, 4, and 1. Add them up and you have 205.

Converting to hex, we obviously don't have any units of 256 in there. We have plenty of 16s, though - twelve of them.

16 x 12 = 192 (12 = "c"

We have 13 remaining, which in hex is "d" - so the resulting hex value is "cd".

5. Hex value C8 into binary

Converting that to decimal, we have 200 -- and you can probably convert that in your sleep at this point.

But just in case you're not sleeping, that binary string would have the 128, 64, and 8 bits set, resulting in:

11001000

For over 100 additional exercises designed to help you master binary and hex conversions, look for my first Kindle book, coming in April 2011 ...

... and be sure to use these free CCNA study resources to help you prepare for exam success!

Be sure to take advantage of these other free CCNA exam study resources!

If you don't pass for any reason before September 30, 2013, you will receive full and free access to my all-new CCNA 200-120 Video Boot Camp, debuting later this summer!

Over 11,000 students are already in my Video Boot Camps on Udemy -- join us today!