Binary Math

Question 1

What is an octet?

Answer 1

8 bits = 1 Octet = 1 byte

Question 2

How to convert a decimal into a binary number?

Answer 2

Subtract it into the 128 64 32 16 8 4 2 1 range.

Question 3

Convert 42 into binary.

Answer 3

128 = 0 64 = 0 32 = 1 16=0 8=1 4=0 2=1 1=0 So: 00101010

Question 4

Convert 10111011 into decimal.

Answer 4

128+0+32+16+8+0+2+1=187 IF THERE IS A 1 as the last binary digit the decimal is always ODD if a 0 then EVEN decimal.

Question 5

What is the highest the first octet can be of an IPv4 Class C address?

Answer 5

223 as that is the maximum value for a Class C IP address.