CIW Cheat Sheet 2026

The 30 highest-yield CIW facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In internet marketing, what is a conversion rate? → The percentage of website visitors who complete a desired action
2. Which file format is best suited for photographic images on the web due to its lossy compression? → JPEG
3. Which cable type uses light pulses transmitted through glass or plastic strands and is immune to electromagnetic interference? → Fiber optic cable
4. What is SQL injection? → An attack that inserts malicious SQL code into input fields to manipulate a database
5. A network administrator wants to limit broadcast domains without using a router. Which technology should be used? → VLAN
6. Which CSS3 property is used to add rounded corners to an element's border box? → border-radius
7. Which principle of web design states that related elements should be grouped together visually? → Proximity
8. Which JavaScript object stores key-value pairs and allows any value (including objects) as a key? → Map
9. Which of the following methods will aid in safeguarding your computer from malware attacks? → Update the definitions for your malware protection application frequently
10. What is the purpose of a shopping cart on an e-commerce website? → Allow customers to select and temporarily hold items before purchasing
11. Which SQL clause is used to filter groups after a GROUP BY operation? → HAVING
12. Which CSS property controls the space between the content and the border of an element? → padding
13. Which protocol operates at Layer 3 of the OSI model and is responsible for logical addressing and routing? → IP
14. Which HTML5 semantic element is most appropriate for the main navigation links of a website? →
15. What does a 404 HTTP status code mean? → The requested resource was not found on the server
16. What is the maximum segment length for a standard 1000BASE-T (Gigabit Ethernet over copper) connection? → 100 meters
17. Which HTML element is used to create an unordered (bulleted) list? →
18. What is a closure in JavaScript? → A function that retains access to its outer scope even after the outer function returns
19. What is the CAN-SPAM Act designed to regulate? → Commercial email messages sent to consumers
20. Which SQL statement is used to retrieve data from a database? → SELECT
21. In wireless networking, what does the term 'SSID' refer to? → The network name broadcast by a wireless access point
22. The information 2E22:4F00:000E:00D0:A267:97FF:FE6B:FE34 is referenced by which of the following? → An IPv6 address
23. Which CSS property is used to control the transparency of an element? → opacity
24. What class of intellectual property comprises company strategies, confidential software, and sales agreements? → Trade secret
25. What is the purpose of the DOCTYPE declaration at the top of an HTML document? → It tells the browser which version of HTML is being used
26. What type of attack involves an attacker intercepting communication between two parties without their knowledge? → Man-in-the-Middle (MitM)
27. In HTML, which attribute is used to specify an alternative text description for an image? → alt
28. Which JavaScript operator checks both value equality AND type equality? → ===
29. What does the 'this' keyword refer to inside an arrow function? → The enclosing lexical context
30. Which layer of the OSI model is responsible for logical addressing and routing? → Network Layer