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CCNA Exams

Discussion in 'General Cisco Certifications' started by baldie, Jul 25, 2006.

  1. baldie

    baldie Bit Poster

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    Perhaps a silly question, but when sitting a Cisco exam do you have access to a calculator on the PC, I can understand knowing things like number of hosts off the top of your head but converting 191 to hex etc??
     
  2. simongrahamuk
    Honorary Member

    simongrahamuk Hmmmmmmm?

    6,199
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    I don't believe so, or at least thats what we found out last time the question was asked. 8)
     
  3. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    The way I've done this so far is to use the paper provided to write down a list of the bit weightings (i.e. bit 7 = 128 ) so as to make it quicker to convert back and forth.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  4. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    its simple like harry says on your paper write this for binary to dec and dec to binary conversion

    128 64 32 16 8 4 2 1


    now to use it write the binary underneath

    0 0 0 0 0 0 1 1 which is the number 3

    and to convert dec to binary again using those numbers say we have 12 to binary:

    0 0 0 0 1 1 0 0 because 128,64,32 & 16 are all too big so 8 goes in and we left with 4 and 4 is the next number so a 1 there. See it?? confusing would have made sense if you were infront of me!:biggrin

    Hex is easy to remember on your paper write

    0 = 0
    1 = 1
    2 = 2
    3 = 3
    4 = 4
    5 = 5
    6 = 6
    7 = 7
    8 = 8
    9 = 9
    10 = A
    11 = B
    12 = C
    13 = D
    14 = E
    15 = F
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  5. r.h.lee

    r.h.lee Gigabyte Poster

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    baldie,

    No, you do not have access to the Microsoft Calculator program.
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  6. baldie

    baldie Bit Poster

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    Thanks for the replies, Binary to decimal and vice versa is fine but how do you work out hex, i.e. how would you work out decimal 157 to hex or decimal 201 to hex??

    Thanks
     
  7. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    its been a while but look here... lets try

    157 for example:

    first you put it into binary = 10011101

    now i want you to split them into groups of 4 bits so : 1001 1101

    from here i want you to work with 4 bits at a time and the weights are: 8 4 2 1
    now put the binary under here: 1 0 0 1
    now that is 8+1 = 9

    the second one 1 1 0 1
    now thats 8+4+1=13 = D

    so 157 = 9D in hex
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  8. baldie

    baldie Bit Poster

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    Nice one....so 201 would be

    11001001

    Split as 1100 and 1001

    1100 = 12
    1001 = 9

    So Hex value would be C9?

    Is that right?
     
  9. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    yip! :clap :thumbleft

    if you could kindly post me a few cold beers ill highly appreciate it! :biggrin
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  10. riaz.hasan

    riaz.hasan Kilobyte Poster

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    yep u got that right... :) practice some more and u'll be fine with the hex thing...
     
    Certifications: Degree, A+, HDA, MCP(270 finally!!)
    WIP: MCDST, MCSA2k3
  11. baldie

    baldie Bit Poster

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    Beers are on their way!:biggrin
    Shame the CCNA Intro isn't just hex questions really!
     
  12. Baldbloke

    Baldbloke Bit Poster

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    Oh well, I will never be CCNA certified 'cos I am hopelessly lost without a calculator!!!!!!!!!!!!! :cry:
     
    Certifications: MCP, A+, Network+, HP APS (Proliant),
    WIP: MCSA/E, Convergence+

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