Edexcel GCSE Computer Science (1CP2) Exam Questions

• D TCP (1)
• The only correct answer is D. The correct answer is TCP.
• A is not correct because FTP is used to transfer files
• B is not correct because HTTP is used to request web pages
• C is not correct because IP routes packets but does not reassemble them

Award one mark for any of the following up to a maximum of two marks:

• Walls/obstacles between the device and the access point (1)
• Interference from other electrical devices/other devices/other wireless networks (1)
• Distance from the access point (1)
• Using a higher frequency band (e.g. 5GHz) (1)
• Low transmit power of the access point/device (1)

Allow thick walls/furniture for walls/obstacles

Do not accept using more bandwidth

Do not accept a weaker signal without a stated cause

Award up to two marks for a linked explanation such as:

• Wireless signals can be blocked or absorbed by walls (1) so the data must be re-sent, which adds delay (1)
• A device further from the access point has a weaker signal (1) so data must be re-sent/transmitted at a lower rate, adding delay (1)
• Devices on a wireless network share a channel (1) so a device must wait its turn to transmit, which adds delay (1)
• Interference from other devices affects the radio signal (1) so data must be re-sent, adding delay (1)

For both marks, the expansion must follow/associate with the statement.

Allow 'waiting to send' or 'collisions' as the delay caused by devices sharing a channel.

Do not accept 'wireless is slower than wired' on its own, as this repeats the question.

Do not accept a reason that only affects download speed/bandwidth (e.g. 'files take longer to download') without a link to delay.