[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-207543-en":3,"doc-seo-207543-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},207543,962084925782,"Chloe Bennett","https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc",4,"Exam","OCR GCSE Computer Science J277/01 Computer Systems - Paper 1","GCSE Computer Science exam paper for the 2023 afternoon session, covering Computer Systems and testing core understanding of binary representation, denary/binary/hexadecimal conversions, and binary arithmetic such as addition and shift operations. The paper also assesses networking knowledge through protocol selection for web, banking, downloads, and email, explains why protocol layers exist, and evaluates LAN characteristics and the effects of moving from wired to wireless connections, including both benefits and drawbacks. Time allowed is 1 hour 30 minutes.","Oxford Cambridge and RSA  \nFriday 19 May 2023 – Afternoon GCSE (9–1) Computer Science J277/01 Computer Systems  \nTime allowed: 1 hour 30 minutes  \n| Please write clearly in black ink. Do not write in the barcodes. |  |  |  |\n| --- | --- | --- | --- |\n| Centre number |  | Candidate number |  |\n| First name(s)  \u003Cbr>Last name   |  |  |  |\n\nINSTRUCTIONS  \n• Use black ink. You can use an HB pencil, but only for graphs and diagrams.  \n• Write your answer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown.  \n• Answer all the questions.  \nINFORMATION  \n• The total mark for this paper is 80.  \n• The marks for each question are shown in brackets [ ] .  \n• Quality of extended response will be assessed in questions marked with an asterisk (*) .  \n• This document has 16 pages.  \nADVICE  \n• Read each question carefully before you start your answer.  \n© OCR 2023 [601/8355/X] DC (PQ) 325517/4  \nOCR is an exempt Charity  \nTurn over  \nPMT  \n2  \n1 Computers represent data in binary form.  \n(a) Tick (3) one box to identify the statement about binary that is true.  Binary digits can only be the values 0, 1 and 2  \n The left-most bit of a binary integer has the smallest value  \n Binary is used because computers are made of switches that can only be on or off  The smallest whole number that can be stored in 8 bits is the number 1  \n[1]  \n(b) Complete the table by writing the missing denary, 8-bit binary or hexadecimal values.  \n\n| Denary | 8-bit binary | Hexadecimal |\n| --- | --- | --- |\n|  | 00000111 | 7 |\n| 49 |  | 31 |\n|  | 01100110 | 66 |\n| 244 | 11110100 |  |\n\n[4]  \nPMT  \n3  \n(c) Tick (3) one box to identify the largest file size.  \n2 000 000 bytes 2300 KB  \n200 MB  \n0.1 GB  \n(d) Tick (3) two boxes to identify the two file sizes that are equal to each other.  \n4 500 000 bytes  \n450 KB  \n4.5 MB  \n0.45 GB  \n(e) Complete the binary addition by adding these two 8-bit binary numbers.  \nShow all your working.  \nPMT  \n[1]  \n[1]  \n0 1 1 1 0 0 0 1  \n+ 1 0 0 1 1 1 1 0  \n[2]  \n(f) Identify the binary shift that has been applied to the 8-bit binary number 10110000 to get the result 10000000.  \n.............................................................................................................................................. [2]  \n© OCR 2023 Turn over  \nPMT  \n4  \n2 A student is performing a range of actions on the internet using their computer.  \n(a) A range of protocols are used for the transmission of data by the student’s computer, and the web servers they are accessing.  \n(i) Complete the table by identifying the most appropriate protocol for each of the tasks the student is performing.  \n\n| Task | Protocol |\n| --- | --- |\n| Requesting to view a news webpage from a web server |  |\n| Entering a username and password to access their bank account |  |\n| Downloading a text document from a web server |  |\n| Checking for new emails in their inbox |  |\n\n[4]  \n(ii) Some protocols have layers.  \nGive two reasons why protocols have layers.  \n1 ........................................................................................................................................  \n...........................................................................................................................................  \n2 ........................................................................................................................................  \n.............................................................................................................................. .............  \n[2]  \n(b) The student’s computer is part of their home Local Area Network (LAN) . The LAN currently only has wired connections.  \n(i) One characteristic of a LAN is that they are set up over a small geographical area. Give one other characteristic of a LAN.  \n....................................................................................................","cbCaidu2yLQWr3gl","https://ap.wps.com/l/cbCaidu2yLQWr3gl","pdf",774520,1,16,"English","en",105,"# Instructions\n# Question 1: Computers (Binary and data representation)\n## Question 1(a)-(f)\n# Question 2: Internet actions and networking (Protocols and LAN)\n## Question 2(a) Protocols and layers\n## Question 2(b) LAN wired vs wireless","[{\"question\":\"What topics are tested in the binary-focused questions?\",\"answer\":\"The paper tests binary representation, including identifying true statements, converting between denary, 8-bit binary, and hexadecimal, completing binary addition, and identifying the type of binary shift from a before-and-after value.\"},{\"question\":\"Which networking tasks require specific protocols?\",\"answer\":\"Students match protocols to tasks such as viewing a news webpage, entering bank credentials, downloading a text document, and checking for new emails.\"},{\"question\":\"What LAN effects are addressed when switching from wired to wireless?\",\"answer\":\"Students explain the benefits of adding wireless connections to a home LAN and then state two drawbacks of making that change.\"}]","OCR GCSE Computer Science J277/01 Computer Systems - 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