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# ACL's and Hex

Member Posts: 70 ■■□□□□□□□□
Hi Everyone-

I'm currently studying hard for 640-821. I'm taking it July 23.

Is ACL's on the Intro exam, or just ICND? I know its tested hard, but not sure its on the INTRO exam.

Also, do you have to know how to do any complex hex to decimal or binary conversion?
Not something simple like 11, but complex (122, 128, etc).

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Member Posts: 70 ■■□□□□□□□□
Example: Number 141.

141/16 = 8 Remainder 13

Hex# = 8D

Divide the number by 16. Then use that number and the remainder number to get the Hex#.

But are ACL's on the INTRO test? Or is that just the ICND test?
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Member Posts: 953
bearfan wrote:
Example: Number 141.

141/16 = 8 Remainder 13

Hex# = 8D

Divide the number by 16. Then use that number and the remainder number to get the Hex#.

But are ACL's on the INTRO test? Or is that just the ICND test?

bearfan,

Decimal to Hexadecimal conversions are easier if you add binary as an intermediate step. Let's take your decimal example of 141 decimal.

Step 1: Convert decimal to binary

141/2 = 70 1
070/2 = 35 0
035/2 = 17 1
017/2 = 08 1
008/2 = 04 0
004/2 = 02 0
002/2 = 01 0
001/2 = 00 1

Reading the remainders from bottom to top, 141 decimal = 10001101 binary

Step 2: Split up the binary byte into two separate nibbles.

10001101 byte = 1000 1101

Step 3: Convert each nibble into a hexadecimal digit.

First nibble = 1000 = 0x8
Second nibble = 1101 = 0xD

Step 4: Combine the two hexadecimal digits

141 decimal = 10001101 binary = 0x8D hexadecimal

Since I took the 640-801 CCNA exam, I have no clue where the 640-821 INTRO exam ended and where the 640-811 ICND exam started.
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Member Posts: 70 ■■□□□□□□□□