AQA COMP3 June 2012 Exam Thread

Could someone explain the difference between a switch, router and hub. There is frequently a question that involves an unlabelled network diagram. I'm worried that if it asked me to identify a device rather than suggest an IP, I wouldn't be able to.

Also, just in case this comes up: do LAN wireless access points operate in baseband or broadband mode? Can there be simultaneous transmissions? The textbook is a bit patchy on the wireless section, so I'm not sure whether we are supposed to know this.

Reply 242

what the hell is the answer to this? i dont think i have a clue o_O ...these are questions i'm scared will come up and make me get a B :/

Reply 243

Original post by drspa44

Could someone explain the difference between a switch, router and hub. There is frequently a question that involves an unlabelled network diagram. I'm worried that if it asked me to identify a device rather than suggest an IP, I wouldn't be able to.

Also, just in case this comes up: do LAN wireless access points operate in baseband or broadband mode? Can there be simultaneous transmissions? The textbook is a bit patchy on the wireless section, so I'm not sure whether we are supposed to know this.

a switch is for segmenting, it will only send the the data to the node it is intended to be sent to. routers route packets according to destination, if it cannot route to the destination in its subnet then it'll send the packet to the next router up in the hierachy.

wireless ponst don't operate in broadband or baseband, they just transmit through the air, and yes there can be simultaneous transmissions

Reply 244

Original post by Amirrryy

what the hell is the answer to this? i dont think i have a clue o_O ...these are questions i'm scared will come up and make me get a B :/

lol, never seen that question before, but from what i deduced about how a stack works im guessing that the elements in the queue will be pushed into the stack one by one, and then simply be popped back out of the stack into the queue. because a stack is last in first out, the elements popped in to the queue will have the effect of reversing it.

Reply 245

ms607

2

Original post by gowans07

Not sure if this has been answered but do the boundaries tend to shift up or down for this exam. ?

This was posted from The Student Room's iPhone/iPad App

The raw marks were scaled up for 2010 and 2011, and I can see them being scaled up again this year, unless the exam is incredibly easy which I highly doubt.

Reply 246

They are usually scaled up, the onyl subject where I see them scaled down often is maths.

Reply 247

NeelTailor

could someone answer this question, it's from the AQA computing book...

Explain why programs can be treated as data? :/

Thanks

Reply 248

I'd basically ignore the questions in the book, lol

Reply 249

i am not good with class definitions so can someone help me with this please.
thanks

Reply 250

SecondHand

Original post by Amirrryy

what the hell is the answer to this? i dont think i have a clue o_O ...these are questions i'm scared will come up and make me get a B :/

Push to stack, pop from stack onto a new queue.

Reply 251

ms607

2

Original post by Amirrryy

i am not good with class definitions so can someone help me with this please.
thanks

no idea if this is completely right but:

Member = Class
[INDENT][INDENT] Public[/INDENT][/INDENT]
[INDENT][INDENT][INDENT] Procedure AddNewMember
Procedure AmendMemberDetails
Procedure DisplayMemberDetails[/INDENT][/INDENT][/INDENT]
[INDENT][INDENT] Private[/INDENT][/INDENT]
[INDENT][INDENT][INDENT] Surname : String
FirstName : String
TelephoneNumber : String
Handicap : Integer[/INDENT][/INDENT][/INDENT]
[INDENT] End[/INDENT]

(edited 11 years ago)

Reply 252

That looks right, but uusually they have an example to show the format of it no?

Reply 253

ms607

2

Original post by exe

That looks right, but uusually they have an example to show the format of it no?

not always, not in the old spec at least

there's only been one question like this in the new spec but they did give the format, so I'm not really sure :s-smilie:

Reply 254

I don't really get linear rehashing, can anyone explain it?

Reply 255

what would be an example of the use of a binary search tree? what are they used for? can you say to find a number in a large sequence of numbers?

Reply 256