l},{"id":"28c8c4b2-6636-4806-ad46-088aebc4e3dc","revisionId":"1a51d956-086a-4b39-9a09-51e77ca5b08a","questionNumber":null,"questionType":"LA","specification":"","difficulty":5,"difficultyBand":"medium","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"b0c066c8-d9de-4475-8ed7-919e5251b7a2","label":null,"content":"A medical facility transmits a high-resolution 3D MRI scan from an imaging system to a remote specialist's workstation over a TCP/IP network.\n\nExplain how the Transport Layer at the receiving workstation ensures that the individual packets of the scan are correctly reconstructed into the original file, even if they arrive out of sequence or some packets fail to arrive.","markscheme":"- Explains that the receiving transport layer uses sequence numbers in the segment/packet headers to reassemble them into the correct original order B1\n- Explains that missing or corrupted packets are identified (via gaps in sequence numbers or checksum failures), prompting a request for retransmission (or the receiver does not acknowledge the packet, causing the sender's timer to expire and trigger a retransmission) B1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"2cb34cd8-0693-4a58-a959-c7a338f0d61f","revisionId":"2d8c113d-dede-4a40-9ff6-cdd40e5148f7","questionNumber":null,"questionType":"LA","specification":"A wireless access point (WAP) uses MAC address filtering to protect a private office network from unauthorized access.","difficulty":4,"difficultyBand":"medium","totalMarks":6,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"15ea29d6-8b13-44d7-a8a1-a5d7b5832fff","label":null,"content":"Draw a flowchart to show how the WAP processes an incoming connection request from a device to decide whether to grant network access or block the device.\n\nBelow are standard flowchart symbols to use in your diagram:\n\n![Standard Flowchart Symbols](https://assets.mathsgenie.co.uk/aqa-qb/31936653-4d56-44d9-a25b-edb56dcc9d1b.png)\n\nYou may not need to use all of the flowchart symbols.","markscheme":"- Correct use of **Start** and **End** terminators connected to the flow. B1\n- Input or process block representing receiving the connection request or reading/extracting the device's MAC address. M1\n- Process block representing looking up or comparing the MAC address against the database/whitelist of allowed devices. M1\n- Decision diamond with clearly labeled output paths (e.g. 'Yes'/'No' or 'Authorized'/'Not Authorized'). M1\n- Process block representing the action 'Grant network access' (or 'Allow connection') if the MAC address is on the whitelist. A1\n- Process block representing the action 'Deny access' (or 'Block connection') if the MAC address is not on the whitelist. A1","marks":6,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_computer_science","summaries":[{"id":"00254646-1893-44fb-a329-75c93c8f7447","difficultyBand":"easy","calculatorUse":null},{"id":"00ba0ade-dfc3-4ee3-9996-d6da7870199d","difficultyBand":"easy","calculatorUse":null},{"id":"026c5d96-0aa7-4c95-bcfd-662538695950","difficultyBand":"easy","calculatorUse":null},{"id":"02751fc9-b48c-4f11-b78e-c1d0d5787974","difficultyBand":"easy","calculatorUse":null},{"id":"03085bff-ef7e-4d1e-97de-d304c985797f","difficultyBand":"easy","calculatorUse":null},{"id":"04e425d9-2dad-4061-94db-b86ac53e27f3","difficultyBand":"medium","calculatorUse":null},{"id":"06c194d5-f71e-4c64-92c7-c1c7c36a0022","difficultyBand":"medium","calculatorUse":null},{"id":"075fb61f-4c42-41a1-86ff-7ea9ca66970d","difficultyBand":"easy","calculatorUse":null},{"id":"0b423ffa-2e76-4113-a772-6d92b992637b","difficultyBand":"medium","calculatorUse":null},{"id":"0c4681c9-b152-4d3c-9c14-800eef8145f6","difficultyBand":"medium","calculatorUse":null},{"id":"10d2a6a9-ef82-4737-bdca-82cea

Networks

Question 10

Networks Questions

Networks

Question 10

Networks Questions