📚 End of Unit 2: Exam-style case study questions | 单元2末尾：考试式案例研究问题
Case study questions at the end of Unit 2 (Communication and Internet Technologies) test your ability to apply theoretical knowledge to realistic scenarios. You may be given a description of an organisation's network, communication needs, or IT infrastructure, and asked to make recommendations, explain technologies, and evaluate options. Success requires not only memorising facts but also demonstrating understanding and critical thinking. This guide will help you interpret such questions, structure your answers, and avoid common pitfalls.
单元2（通信与互联网技术）末尾的案例研究问题旨在考查你将理论知识应用于实际场景的能力。你可能会看到对一个组织的网络、通信需求或IT基础设施的描述，并被要求提出建议、解释技术并评估选项。成功答题不仅需要记忆事实，还需要展示理解和批判性思维。本指南将帮助你解读这类问题、组织答案并避免常见错误。
1. Understanding Exam-style Case Studies | 理解考试式案例研究
Exam-style case studies present a scenario — often several paragraphs long — followed by a series of questions. The scenario might describe a company with multiple branches, a university needing a new campus network, or an e-commerce business facing security threats. Questions range from simple recall ('State the function of a router') to higher-order skills like evaluation ('Assess whether the company should adopt cloud computing'). The marks allocated indicate the depth required; for example, an 8-mark evaluation question expects a balanced discussion with a conclusion. Always read the entire scenario before attempting any question, as details are often interlinked.
考试式案例研究提供一个场景——通常有几段文字——后跟一系列问题。场景可能描述一家有多家分店的公司、一所需要新校区网络的大学，或一家面临安全威胁的电子商务企业。问题从简单的回忆（如“陈述路由器的功能”）到更高级的技能如评估（如“评价公司是否应采用云计算”）。分配的分数表明了所需的深度；例如，一道8分的评估题期待观点均衡的讨论并得出结论。在尝试回答任何问题之前，务必通读整个场景，因为细节往往是相互关联的。
2. Key Topics from Unit 2 | 单元2的关键主题
Unit 2 covers communication basics, network types, hardware, protocols, and security. Case studies often integrate several topics. Key areas include: network types (LAN, WAN, VLAN, PAN), transmission media (twisted-pair, coaxial, fibre optic, wireless, satellite), network devices (hub, switch, router, bridge, gateway, modem), Internet infrastructure (ISP, DNS, IP addressing, URLs), the TCP/IP protocol stack, HTTP/HTTPS, FTP, email protocols, VPNs, firewalls, encryption, and cloud computing models. Be prepared to apply these concepts to a specific context, not just state definitions.
单元2涵盖通信基础、网络类型、硬件、协议和安全。案例研究常整合多个主题。关键领域包括：网络类型（LAN、WAN、VLAN、PAN）、传输介质（双绞线、同轴电缆、光纤、无线、卫星）、网络设备（集线器、交换机、路由器、网桥、网关、调制解调器）、互联网基础设施（ISP、DNS、IP寻址、URL）、TCP/IP协议栈、HTTP/HTTPS、FTP、电子邮件协议、VPN、防火墙、加密和云计算模型。准备好将这些概念应用于特定情境，而不仅仅是陈述定义。
3. Reading the Case Study Effectively | 有效阅读案例研究
Before answering questions, read the scenario carefully. Highlight or note down key requirements, constraints, and technical details. Ask yourself: what is the organisation's main goal? Are there any specific challenges (e.g., budget limits, remote locations, security concerns)? Identify which parts of the syllabus are relevant. For instance, if the scenario mentions 'branch offices in different countries' and 'real-time video conferencing', think about WAN technologies, latency, bandwidth, and protocols like VoIP. The scenario often contains clues that help you tailor your answers; ignoring them leads to generic, low-scoring responses.
在回答问题之前，仔细阅读场景。标出或记下关键需求、约束条件和技术细节。问自己：该组织的主要目标是什么？是否有特定挑战（例如预算限制、远程地点、安全顾虑）？确定与教学大纲的哪些内容相关。例如，如果场景提到“在不同国家设有分支机构”和“实时视频会议”，就要联想到广域网技术、延迟、带宽以及VoIP等协议。场景通常包含有助于你量身定制答案的线索；忽视它们会导致笼统、低分的回答。
4. Structuring Your Answers | 组织你的答案
Use clear paragraphs and logical structure. For 'describe' questions, provide a concise definition followed by details relevant to the case. For 'explain' questions, state the cause–effect relationship or how a technology works in context. For 'compare' or 'evaluate', use a balanced approach: present both sides and then a reasoned conclusion. Always link back to the scenario; never give generic textbook answers. For example, instead of saying 'A switch reduces collisions', say 'By replacing the hub with a switch, the company's office network will reduce data collisions, improving performance for the database application mentioned in the scenario.'
使用清晰的段落和逻辑结构。对于“描述”类问题，先给出简洁的定义，然后提供与案例相关的细节。对于“解释”类问题，陈述因果关系或某项技术如何在情境中工作。对于“比较”或“评估”类问题，采用平衡的方法：呈现正反两面，然后给出合理的结论。始终回扣场景；切勿给出笼统的教科书式答案。例如，不要说“交换机能减少冲突”，而应说“通过用交换机替换集线器，公司办公室网络将减少数据冲突，改善场景中提到的数据库应用程序的性能。”
5. Applying Knowledge: Commands and Requirements | 应用知识：指令词与要求
Understanding the command words is crucial. Common ones include: State/Give – a brief fact or name. Describe – provide characteristics or details. Explain – give reasons or causes, often using 'because'. Compare – identify similarities and differences. Discuss/Evaluate – present arguments for and against, and make a judgment. Recommend – suggest a solution with justification based on the scenario. For 2–3 mark 'state' questions, a single sentence may suffice. For 6-mark 'explain', you need several linked points. Always check the mark allocation to gauge depth.
理解指令词至关重要。常见的有：State/Give——简短的事实或名称。Describe——提供特征或细节。Explain——给出理由或原因，常用“因为”。Compare——识别相似点和不同点。Discuss/Evaluate——提出支持和反对的论点，并做出判断。Recommend——基于场景提出解决方案并说明理由。对于2–3分的“陈述”题，一句话可能就足够了。对于6分的“解释”题，你需要多个相关联的要点。务必查看分值以把握深度。
6. Answering 'Describe' and 'Explain' Questions | 回答“描述”和“解释”类问题
In case studies, description questions might ask you to 'describe the network topology shown' or 'describe how packet switching works in this context'. Start by defining the term, then elaborate with scenario-specific details. Explanation questions require more depth: you might need to explain why a certain technology is suitable or how a protocol ensures secure transmission. Use linking words like 'as a result', 'therefore', 'this means that'. For example, if a hospital needs secure patient record transmission, explain that HTTPS encrypts data via SSL/TLS, preventing eavesdropping and ensuring confidentiality — a critical requirement in the scenario.
在案例研究中，描述类问题可能要求你
Published by TutorHao | A-Level Computer Science Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图