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    I'll be happy if AQA doesn't pull a COMP1 and hit us with a 100 Mark essay on the history of FEN.
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    I've just realize something, AQA recycle a lot of the Comp3 questions
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    (Original post by Async)
    I've just realize something, AQA recycle a lot of the Comp3 questions
    I can't remember which papers, but there's a network topology question with an almost identical diagram to an earlier paper.
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    (Original post by Joe1000000)
    I can't remember which papers, but there's a network topology question with an almost identical diagram to an earlier paper.
    Yup! That's pretty much comes up every other year, and so does the Turing Machine question.
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    Hoping a page and a bit 8-10 marker doesn't come up. Has anyone else noticed the boundaries have slowly from 80 to 90?

    Hopefully will get an A*, since I got 73 in the project, and the may balance out any mishaps and one day's worth of COMP3 revision.
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    (Original post by Harjot)
    Hoping a page and a bit 8-10 marker doesn't come up. Has anyone else noticed the boundaries have slowly from 80 to 90?

    Hopefully will get an A*, since I got 73 in the project, and the may balance out any mishaps and one day's worth of COMP3 revision.
    Yeah I was looking at that earlier :/ Maybe it'll reverse tomorrow :O
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    I hope nothing much comes up about operating systems.. I'll cry if it's a 6-8 marker on it.. Hoping for a long Turing machine question and some SQL/DDL stuff, finished off with a round of CSMA/CD!
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    (Original post by Shaney96)
    I hope nothing much comes up about operating systems.. I'll cry if it's a 6-8 marker on it.. Hoping for a long Turing machine question and some SQL/DDL stuff, finished off with a round of CSMA/CD!
    CSMA/CD would be nice, it just sounds a lot harder than it really is.
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    I basically know nothing about the Commmunication and Networking topics
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    (Original post by Exaltation)
    I basically know nothing about the Commmunication and Networking topics
    Sleep will serve you better now
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    What do people think may come up tmo?
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    I strongly believe that the 8 marker will be on hashing or operating systems
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    For June 2012, question 5bi and 5bii, isn't the mark scheme the wrong way round?
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    (Original post by BaronK)
    CSMA/CD would be nice, it just sounds a lot harder than it really is.
    Could you explain CSMA/CD to me please?
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    (Original post by akashpatel)
    Could you explain CSMA/CD to me please?
    https://en.wikibooks.org/wiki/A-leve...rking/Networks
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    (Original post by akashpatel)
    Could you explain CSMA/CD to me please?
    Essentially it is two protocols, a data transmission checking protocol and a collision protocol.

    When a computer wishes to transfer data, it will check the bus backbone to see if it is busy. If it is not, it will transfer a frame of data to its recipient. It will keep doing this until a collision is detected.

    When a collision is detected, the computer will send a jamming signal to all the other computers on the bus network to tell them to stop transferring. It will also stop transferring.

    Some time later said computer will try transferring a frame of data again and the process will repeat.

    Hope that helps!
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    (Original post by akashpatel)
    Could you explain CSMA/CD to me please?
    when a node wants to transmit it checks if the bus is clear
    if it is and they are the only one sending then that's fine, but several check at once, and all the transmit at once, there's a collision

    in this event, all computers in transmission emit a jamming signal to indicate that computers should cease transmission
    then all the computers wait a random amount of time (some number of milliseconds) before trying to transmit again, so there is a low chance of another collision

    if for some reason the network is overloaded and there are lots of collisions, an error is output to the user
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    (Original post by AlecRobertson)
    For June 2012, question 5bi and 5bii, isn't the mark scheme the wrong way round?



    Looks the right way around to me.
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    (Original post by AlecRobertson)
    For June 2012, question 5bi and 5bii, isn't the mark scheme the wrong way round?
    no
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    (Original post by AlecRobertson)
    Essentially it is two protocols, a data transmission checking protocol and a collision protocol.

    When a computer wishes to transfer data, it will check the bus backbone to see if it is busy. If it is not, it will transfer a frame of data to its recipient. It will keep doing this until a collision is detected.

    When a collision is detected, the computer will send a jamming signal to all the other computers on the bus network to tell them to stop transferring. It will also stop transferring.

    Some time later said computer will try transferring a frame of data again and the process will repeat.

    Hope that helps!
    Thank you very much! That was very helpful
 
 
 
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