2026IGCSE计算机0478Paper1考前考点+答题技巧汇总

发布于：2026-05-12 17:56 阅读次数：次编辑：Vicky

2026 年 IGCSE 计算机 0478 Paper 1 即将开考，想要稳稳冲 A*、避免无谓失分，考前梳理高频考点、掌握标准答题模板和避坑易错点至关重要。犀牛老师特意整理了 IG 计算机 0478 P1 核心高频考点、实用答题技巧、万能答题模板以及高频易错知识点，考前快速过一遍，高效抢分、助力考场稳拿高分，轻松冲刺 A*！

IGCSE计算机P1考试规则

IGCSE计算机P1高频考点

1. Data representation

Number conversion: Binary → denary: add place values. Denary → binary: use 128,64,32,16,8,4,2,1. Hex ↔ binary: group into 4 bits. 中文：十六进制每 1 位对应 4 位二进制。

Binary addition: Add from right to left. 1+1=10, 1+1+1=11. Overflow occurs when result needs more bits than available. 中文：8-bit 加法结果超过 8 位就是 overflow。

Logical shift: Left shift usually multiplies unsigned binary by 2 per position; right shift divides by 2 per position, but lost bits are discarded. 中文：不要忘记补 0 与被移出位丢失。

Two’s complement: For negative numbers: invert bits and add 1. Most significant bit indicates sign in signed representation. 中文：最左边是符号位, 1 表示负数，0 表示正数；step1 先转为二进制，step2 翻转 0 和 1(符号位不变), step3 加一

Images: File size = width × height × colour depth. Higher resolution/colour depth increases file size. 中文：颜色深度 bit depth决定每个像素需要多少 bit。

Sound: File size = sample rate × sample resolution × duration × channels. Higher sample rate/resolution improves fidelity but increases file size. 中文：采样率越高，声音越接近原声。

Character set: such as ASCII(7bits) or Unicode ,is a collection of characters and their corresponding binary values

2. Data transmission

Packets: Large files are split into packets; each packet may contain header information such as destination/source address, sequence number and error-check data. 中文：sequence number 用于重组顺序。

Serial vs parallel: Serial is reliable over long distances and uses fewer wires; parallel can be faster over short distances but suffers from skew/crosstalk. 中文：长距离优先 serial。

Simplex / half-duplex / full-duplex: Simplex one-way only; half-duplex both ways but not at same time; full-duplex both ways simultaneously. 中文：电话 full-duplex，对讲机 half-duplex。

Error detection: Parity checks add a parity bit; checksum uses calculated totals; ARQ requests re-transmission if error detected. 中文：error detection 不是 error correction，除非题目提到 re-transmission。

Parity check: A parity bit is a single bit added to a transmission that can be used to check for errors in the transmitted data.Its value is calculated based on the transmitted data itself.

Encryption: Plaintext → ciphertext using key; symmetric uses same key; asymmetric uses public/private keys. 中文：HTTPS 用加密保护传输数据。

3. Hardware

CPU cycle: Fetch instruction from memory, decode it in control unit, execute using ALU/registers, store result if needed. 中文：F-D-E 顺序要稳。

Registers: PC stores address of next instruction; MAR stores memory address; MDR stores data/instruction being transferred; ACC stores intermediate results. 中文：寄存器题要写“存什么”。

Performance: Clock speed, number of cores and cache size can improve performance, but software must be able to use them. 中文：不要绝对化“more cores always faster”。

Storage: RAM volatile and fast; ROM non-volatile; SSD has no moving parts and faster access; HDD cheaper per GB; optical is portable but slower. 中文：比较题写 feature + consequence。

Embedded systems: Dedicated computer built into a larger device, often with limited hardware and real-time control. 中文：洗衣机、汽车 ABS、微波炉常见。

Router: 看到问硬件 device, 功能是 directs data packets，sending data, 无脑填 router

4. Software

Operating system: Manages memory, files, peripherals, user interface, security, multitasking and interrupts. 中文：OS 是硬件和用户/应用之间的管理层。

BIOS: BIOS is firmware stored in ROM/flash memory. It performs hardware checks when the computer starts, initializes hardware, finds the boot device, and starts loading the operating system.中文：刚开机时出现，在 OS 启动之前

Interrupts: Signal requiring CPU attention; CPU suspends current task, runs interrupt service routine, then returns. 中文：打印机缺纸、键盘输入都是例子。

Compiler: Translates whole program before execution; creates executable/object code; errors listed after compilation; execution can be faster after translation. 中文：一次整体翻译。

Interpreter: Translates/executes line by line; easier debugging; no separate object code; slower repeated execution. 中文：逐行翻译。

Low-level vs high-level: Low-level closer to hardware and may be faster; high-level easier to read / write / maintain and portable. 中文：assembly 用 assembler 翻译。

Integrated Development Environments (IDE): Code editors, Run-time environment, Translators, Error diagnostics

5. The internet and its uses

The internet is a global network of interconnected computers and devices.It provides the physical and

technical infrastructure that allows data to be sent and received.

The World Wide Web (WWW)is a collection of websites and web pages that can be accessed via the internet using web browsers.

URL: protocol( HTTPS, FTP, SMTP) + domain name + filename

IP vs MAC: IP address identifies a device on a network and can change(e.g.,192.168.1.1)

MAC is hardware address of network interface and usually fixed. 中文：IP 可变，MAC 固定。

DNS: Translates domain names into IP addresses so browsers can locate servers. 中文：域名到 IP 的“电话簿”。

HTTP/HTTPS: HTTP transfers web pages; HTTPS adds encryption/authentication using certificates, improving security. 中文：S = secure(SSL)。答题结合 asymmetric

Web browsers: Storing bookmarks / favourites; Recording user history; Multiple tabs; Storing cookies; Navigation tools

Cybersecurity threats: Phishing tricks users into revealing data; malware damages/steals data; brute-force tries many passwords; DDoS overwhelms service. 中文：答案要写攻击方式 + 影响。 proxy server 可以抵挡 DDoS

Protection: Strong passwords, 2FA, firewall, anti-malware, encryption, backups, user access levels, software updates. 中文：措施必须对应威胁。

6. Automated and emerging technologies

Monitoring vs control: Monitoring reads sensor data only; control uses sensor data to trigger actuator/output. 中文：control 必须有 actuator/action。

Feedback loop: Sensor input → processor compares with set point → actuator changes environment → repeat. 中文：温控,laser 系统常考。

AI / machine learning: AI systems can make decisions/predictions from data; benefits include automation and pattern recognition; risks include bias, privacy and accountability. 中文：评价题要正反两面。Ability to learn; Ability to adapt; Ability to reason; base on the knowledge base.

Cloud computing: Remote storage/processing via internet; benefits include access anywhere and scalability; risks include dependency on internet and data security. 中文：不要只写“more storage”，要联系远程访问。

IGCSE计算机 P1答题技巧

IGCSE计算机 P1易错点

把 “encryption” 写成 “prevents hacking”更准确。encryption makes intercepted data unreadable without the key.

比较题只写 A 的优点再写 B 的优点，没有逐点 paired comparison。

把 “error detection” 当成自动纠错；很多方法只是检测，需重传(ARQ)才恢复正确数据。

CPU 寄存器名称背了但功能混淆：PC = next instruction address; MAR = address being accessed; MDR =

data/instruction transferred.

文件大小忘记单位换算：bits → bytes divide by 8；KiB/MiB 与 KB/MB 题目若指定必须按题目。

安全题措施不对应威胁：phishing 主要靠 user awareness/2FA/URL checking；firewall 不等于万能。

评价题没有 judgement：最后必须写 “Overall, for this context…”

可直接套用的英文模板

“This improves performance because …, so the user/system can …”
“A is … whereas B is …”
“The data is encrypted, so if it is intercepted it cannot be understood without the key.”
“The sensor sends data to the processor; the processor compares it with a stored value; an actuator is triggered if needed.”
“This is suitable in this context because … However, a limitation is … Overall …”
“More detail/resolution increases the number of bits that must be stored, therefore increasing file size.”