The internet is a global network of interconnected computers that communicate using a standardised set of rules called protocols. Think of it like the postal system: just as the postal system has addresses, delivery rules, and specialised services (courier for urgent parcels, registered post for valuables), the internet has URLs as addresses, protocols as delivery rules, and specialised services like email, file transfer, and secure transactions.
Here is the mental model that will serve you in the exam hall: every internet action maps to a specific protocol. You type an address (URL) into a browser, the browser uses HTTP or HTTPS to fetch the page, your email client uses SMTP to send mail and POP3/IMAP to receive it, and when you download a file, FTP does the heavy lifting. Each protocol has a designated port number — a door number on the server through which that specific type of traffic enters.
The World Wide Web (WWW) is not the same as the internet — it is one service that runs on top of the internet, specifically the collection of web pages and websites you access through a browser. Other internet services include email, file transfer, VoIP, and online gaming. This distinction — internet as the infrastructure, WWW as a service on it — is a favourite trick question.
An ISP (Internet Service Provider) is the company that physically connects you to this global network. In India, Airtel, Jio, and BSNL are ISPs. Without an ISP, your device has no path into the internet, regardless of what software you have installed.
Security on the internet is layered: HTTPS adds encryption over HTTP, and the encryption itself is done using SSL/TLS protocols. A padlock in your browser's address bar means the connection is using HTTPS with a valid SSL/TLS certificate. This matters for banking — SBI's own netbanking portal uses HTTPS for precisely this reason.
A Uniform Resource Locator (URL) is the complete address of a resource on the internet. Break down https://www.sbi.co.in/careers/index.html:
| Part | Example | Role |
|---|---|---|
| Protocol | https:// | How to fetch |
| Subdomain | www | Which server section |
| Domain name | sbi.co.in | Which organisation |
| Path | /careers/index.html | Which specific file |
The exam will test the full form (Uniform Resource Locator — not Universal) and the components. The domain name is the human-readable address; under the hood it maps to a numeric IP address via DNS (Domain Name System).
This table is the single most-tested fact cluster in internet basics:
| Protocol | Full Form | Purpose | Default Port | |---|---|---|---| | HTTP | HyperText Transfer Protocol | Web page transfer | 80 | | HTTPS | HTTP Secure | Encrypted web transfer | 443 | | FTP | File Transfer Protocol | File upload/download | 21 | | SMTP | Simple Mail Transfer Protocol | Sending email | 25 | | POP3 | Post Office Protocol v3 | Receiving email (downloads) | 110 | | IMAP | Internet Message Access Protocol | Receiving email (server-side) | 143 | | DNS | Domain Name System | Domain-to-IP translation | 53 | | DHCP | Dynamic Host Configuration Protocol | Auto IP assignment | 67/68 |
Three ports are frequently tested: 80 (HTTP), 443 (HTTPS), 21 (FTP). Port 25 for SMTP appears occasionally. The rest are rarely tested at SBI PO level.
An email address has the form username@domain.com. The part after the @ is the domain name, which identifies the mail server — specifically, it tells other mail servers where to deliver the message. The username is just the mailbox label on that server.
The journey of one email:
HTTP sends data as plain text — anyone intercepting the packets can read them. HTTPS wraps HTTP inside SSL/TLS encryption, which does two things:
SSL (Secure Sockets Layer) is the older standard; TLS (Transport Layer Security) replaced it and is what modern systems actually use. But the term "SSL certificate" stuck in common usage — so when you see "SSL/TLS" in an option, treat them as synonyms for the exam.
Cookies are small text files that a website stores on your device through your browser. They are not passwords, not malware, and they do not speed up your connection. Their purpose: remember who you are across pages and sessions — your login status, language preference, shopping cart contents. Session cookies expire when you close the browser; persistent cookies survive across sessions.
A browser (Chrome, Firefox, Edge) is the software that renders web pages. A search engine (Google, Bing, DuckDuckGo) is a website/service that indexes the web and returns results for queries. You use a browser to access a search engine. These are not interchangeable terms — the exam sometimes offers them as options hoping you confuse them.
Group the four key ports as a two-row pattern:
When you see a port-number question, mentally recite: "web 80/443, file 21, mail 25." Standard approach (reading all options carefully): 20-25 seconds. With this pattern recalled instantly: 5 seconds.
Use the acronym SAFE to remember the four most-tested protocols and eliminate wrong options:
When a question asks "which protocol does X", eliminate everything not in SAFE first. This reduces a 4-option question to a 2-option question in under 3 seconds — standard reading: ~15 seconds of deliberation eliminated.
The trap is "Universal Resource Locator" vs "Uniform Resource Locator." Remember: URLs are standardised — the word for standardised is Uniform. The same logic applies: USB = Universal Serial Bus (hardware that connects anything), URL = Uniform Resource Locator (standardised format). Contrast them — USB is Universal because it connects diverse devices; URL is Uniform because it follows a fixed format. This pairing saves you from the most common URL full-form trap. Recalling this: 2 seconds vs rethinking from scratch: 10-12 seconds.
Visualise the @ symbol as an arrow pointing right: username @→ domain. The domain (right side) is the mail server address. The question will give you options like "@ symbol," "username," "domain name," "subject line" — only the domain name is the server identifier. The @ is just a separator character. Substituting this mental image: instant elimination of 3 wrong options in 2 seconds.
"SSL is dead, TLS runs the world — but everyone still calls it SSL." Treat any option with SSL/TLS as one unit. If a question asks about secure transactions and offers both "SSL" and "SSL/TLS" as options, "SSL/TLS" is always preferred because it acknowledges both the legacy name and the current standard. If only one appears, pick it over HTTP/FTP/SMTP without hesitation — those three are never used for encryption. Decision time: 3 seconds vs 15 seconds of second-guessing.
When you see an Internet Basics question in the exam, run this decision tree:
Step 1 — Identify the question type:
Step 2 — Eliminate first, confirm second. Most internet basics questions have two clearly wrong options. Remove them in 2 seconds, then choose between the remaining two using the specific rule.
Step 3 — If genuinely unsure between two: pick the more specific option. "SSL/TLS" beats "HTTPS" for encryption-mechanism questions. "Domain name" beats "@ symbol" for server-identifier questions.
Target time per question: 20-25 seconds.
Why this question: Tests whether you know the internal structure of an email address — a commonly misunderstood concept where students confuse the role of @ with the domain name.
Solving path: Reconstruct a real address — user@example.com. The @ is a separator, not a server identifier. "Domain name" = example.com = the mail server. Eliminate username (identifies the mailbox, not server), @ symbol (separator), subject line (part of email content, not address). Answer: Domain name. Time: 10 seconds.
Why this question: Protocol-to-function mapping is the most frequently tested concept. Students confuse FTP with HTTP because both are "transfer" protocols — but HTTP transfers web page data, FTP transfers files explicitly.
Solving path: Apply SAFE — F = FTP = File transfer. Eliminate HTTP (web pages), SMTP (sending mail), POP3 (receiving mail). Answer: FTP. Time: 8 seconds.
Why this question: Abbreviation questions at SBI PO are designed to catch candidates who know the term but not the exact full form — "Internet Security Protocol" sounds plausible.
Solving path: ISP = Internet Service Provider. The giveaway is that options B and C use "Service" vs "System" — ISP is a company (provider), not a system or process. Examples like Airtel/Jio confirm "Service Provider." Answer: Internet Service Provider. Time: 8 seconds.
Why this question: The HTTP vs HTTPS distinction is directly relevant to banking security — SBI PO exam treats this as a financial literacy question disguised as computer knowledge.
Solving path: "Secure" is the keyword. HTTP is insecure (port 80). HTTPS adds SSL/TLS encryption (port 443). FTP is for files, SMTP for mail — neither handles web security. Answer: HTTPS. Time: 6 seconds.
Why this question: Tests the specific mechanism behind secure transactions — a level deeper than just knowing HTTPS exists. Candidates who only memorised "HTTPS = secure" without knowing SSL/TLS underlies it will get this wrong.
Solving path: The question asks about the encryption technology, not the protocol label. HTTP = plaintext. FTP = file transfer. SMTP = email. SSL/TLS = the actual encryption engine inside HTTPS. Answer: SSL/TLS. Time: 10 seconds.
Why this question: URL full form is a perennial favourite with a deliberate trap — "Universal" vs "Uniform."
Solving path: URLs follow a fixed, standardised format — Uniform. "Universal" would mean usable by all types of devices (that is USB's domain). Eliminate options A, C, D. Answer: Uniform Resource Locator. Time: 6 seconds.
Why this question: Port numbers are tested directly at SBI PO level, particularly the distinction between HTTP (80) and HTTPS (443) — confusing these is the intended trap.
Solving path: Recall the grid — HTTPS = port 443. Port 80 = HTTP (insecure), port 21 = FTP, port 25 = SMTP. The question specifies "secure web traffic," confirming 443. Answer: 443. Time: 5 seconds.
Why this question: Cookies are frequently mischaracterised in trick options — "store passwords" and "block ads" are deliberate distractors targeting students who have heard of cookies without knowing their precise function.
Solving path: Cookies store session state — login status, preferences, cart contents. They do not store passwords (password managers do that separately), increase speed (that is caching), or block ads (ad blockers do that). Answer: To store user preferences and session information. Time: 10 seconds.
Confusing WWW with the internet. The internet is the physical and logical infrastructure; WWW is one application running on it. A question asking "what is not the internet but uses it" has WWW as a valid answer.
Treating @ as the server identifier in email. The @ is a delimiter only. The domain name after it identifies the server. This trap appears in almost every internet basics question set.
Mixing up HTTP and HTTPS port numbers. Port 80 is insecure HTTP; port 443 is secure HTTPS. If you have to remember one, remember 443 — because HTTPS questions are more common in banking exams.
Confusing FTP with HTTP for "transfer." Both transfer data, but HTTP transfers web page content as a response to a browser request. FTP is the dedicated protocol for moving files between systems, supporting explicit upload and download commands.
Confusing SSL and TLS as separate, competing technologies. They are not. TLS is the successor to SSL. In exam options they appear together as "SSL/TLS" and that is always the correct answer for encryption. Do not pick "SSL" alone when "SSL/TLS" is available.
Thinking cookies store passwords. Cookies are plain text files — they store session tokens (a temporary ID that proves you logged in), not actual credentials. Storing passwords in cookies is a security malpractice, not the standard behaviour.