The Internet, the Web and Email

intermediate26 min read

How the Internet differs from the Web, IP addresses and DNS, the parts of a URL, HTTP versus HTTPS and status codes, browser cache and cookies, how email is sent and retrieved with SMTP, POP3 and IMAP, and the port numbers exams expect you to know.

What you will be able to do

State the difference between the Internet and the World Wide Web.
Explain how DNS turns a domain name into an IP address and name the parts of a URL.
Describe what HTTPS adds over HTTP and read an HTTP status code by its family.
Distinguish SMTP, POP3 and IMAP and recall the common port numbers.

What is inside this lesson

1Internet vs Web
2IP addresses and DNS
3The parts of a URL
4HTTP, HTTPS, status codes and ports
5How the browser helps and remembers
6How email works
7Worked example: from URL to page, and back to parts
8Common confusions
9Quick revision
10Practice

The lesson itself is for members

Reading the 10 sections above, the worked examples and the practice set is free — the whole knowledge base is on the free plan, along with flashcards, private notes and Ask Onely.

Create a free account Sign in