Computer Fundamentals Topic 6: Internet Basics - Lesson 2
DNS, Servers, Search, And Safe Browsing
Understand how names find servers and how to browse more safely.
DNS, Servers, And Search
DNS stands for Domain Name System. It translates human-friendly domain names into IP addresses.
A server provides services or data to other devices. A search engine helps users find pages on the web.
- DNS lets people use names instead of numeric addresses.
- Web servers respond to browser requests.
- Search engines index pages and return results.
Safe Browsing
Check that website addresses look correct before entering private information. Be careful with unexpected downloads and urgent messages.
HTTPS helps protect data in transit, but it does not prove that every website is trustworthy.
- Look for misspelled domains.
- Avoid suspicious attachments.
- Do not rush when a page pressures you.
DNS As The Internet's Naming Helper
Computers route traffic using addresses, but humans remember names better. DNS connects these two worlds by translating domain names into IP addresses.
DNS is distributed, meaning no single small list contains every answer. Resolvers, root servers, top-level domain servers, and authoritative servers work together behind the scenes to find the correct address.
- Domain names are for humans.
- IP addresses are for network routing.
- DNS lookups usually happen automatically.
- DNS caching makes repeated visits faster.
Servers And Search Engines
A server is a computer or service that responds to requests. A web server sends web pages or data to browsers. A search engine is different: it discovers pages, indexes them, and ranks results for searches.
Typing a website address directly and searching for a website are not the same action. Searching sends your words to a search engine. Typing a known address asks the browser to open that address.
- Servers provide data or services.
- Search engines help find pages.
- A browser opens pages.
- A search result may not always be the official site.
Safer Browsing Habits
Safe browsing is mostly careful attention. Check the domain before logging in, be suspicious of urgent messages, avoid unexpected downloads, and do not enter sensitive data on pages you reached from strange links.
HTTPS is important because it encrypts data in transit, but it does not prove that a site is legitimate. A phishing site can also use HTTPS. Security is a chain of signals, not one icon.
- Navigate to important sites from bookmarks or typed addresses.
- Avoid entering passwords after clicking suspicious links.
- Keep the browser updated.
- Use MFA for important accounts.
Quick Summary
- DNS maps domain names to IP addresses.
- Servers provide data or services.
- Safe browsing requires checking links and downloads.
Practice Quiz
Now practice this lesson with MCQs and explanations: