URLs and domains: parts and rules

What you’ll practice

URLs look simple until you need to explain what each piece does. This quiz helps you read and build web addresses correctly, from protocol and subdomains to paths, parameters, and fragments.

Expect a mix of definition checks and real-world examples, including tricky edge cases like trailing slashes, default ports, and URL encoding.

Format and difficulty controls

Each question has 4 options and there’s no timer, so you can slow down and reason through the structure. Before you start, pick how many questions you want and choose a difficulty level; “Mixed” blends easy recognition with tougher rule-based items for balanced practice.

• Identify scheme, host, TLD, subdomain, path, query string, and fragment
• Spot valid vs invalid domain labels (length, characters, hyphen rules)
• Understand ports, default ports, and when they appear in a URL
• Practice percent-encoding and reserved characters in queries/paths
• Distinguish absolute vs relative URLs and common resolution behavior

Common pitfalls to avoid

Many mistakes come from confusing the path with the domain, treating fragments as server-side data, or assuming query parameter order always matters. Another frequent slip is forgetting that DNS names are case-insensitive while URL paths can be case-sensitive depending on the server.

How scoring improves your web intuition

Because questions range from quick part-identification to rule application, you’ll build both speed and accuracy. Replaying with a different question count or difficulty is a good way to reinforce weak spots without redoing the entire set.