Several sources allege that the 640-607 exam check whether you know HEX. Here's a quiz!

1. Convert 0xC0C0 into decimal?

2. Convert 255 into hexidecimal?

3. What is 67 - 0xA1?

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Ron Steedman CCNP, CCNA, MCP, BS Computer Science
Free CCNA Practice Tests, Study Guides, & Message Boards!
http://www.congonetworking.com/

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1.49344
2.FF
3.

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pretty cool IP test on your site.
I got all ten right

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rsteedma, nice site you have going, I especially did like the ARP section. It remind me of some old college materials I was tested on

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Beside using the calculator (which you can't in the exam) Can you show me how you came up with the 4933 or FF.

Thanks

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For question 2 just convert it to binary, then break the digits up into groups of 8 and add them up in hex
For question 1 you could break the hex up and convert it to binary but I dont think anyone has 2^64 memorized

the answer to 3 is:
67 - 161 = -94

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i made this while i was studying for CCNA. maybe it will help.

(word doc.)

Attachment: decimal to hex conversion chart.doc
This has been downloaded 36 time(s).

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Frankly, I don't see what Cisco would accomplish by testing candidate's Hex conversion ability. There are calculators in real world and I can't possibly see anyone spending their precious one minute on exam drawing up table to convert a number such as
0xC0C0 to decimal (unless you are Rainman). It would not be worth my time atleast. I can see the value ot IP address subnetting, atleast temporarily till the IPV6 comes along. But other than that, it would serve no purpose but to increase the failure rate and generate some cash for testing sites and Cisco.

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Thanks Chodan and Cross36 - I'm glad you enjoyed the questions / study guide.

Frank, here's how I converted it:

= 0xC0C0
= C * 16^3 + 0 x 16^2 + C x 16^1 + 0 x 16^0
= C * 16^3 + C * 16^1
= 12 * 16^3 + 12 * 16^1 [C=12]
= 12 * 2^12 + 12 * 16
= 12 * 4096 + (10 * 16) + (2 * 16)
= (10 * 4096) + (2 * 4096) + 160 + 32
= 40960 + 8192 + 192
= 40960 + 8384
= 49344

For the 640-607 CCNA exam...

Converting 0xC0C0 into binary would be fair.
Converting 0xC0C0 into decimal is not fair.
Converting 255 into FF is fair.

Thanks,
Ron

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Ron Steedman CCNP, CCNA, MCP, BS Computer Science
Free CCNA Practice Tests, Study Guides, & Message Boards
http://www.congonetworking.com/

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