Internet protocols are among the most consistently tested topics in SBI PO Computer Knowledge, yet most students either memorise full forms without understanding function, or skip the topic assuming it's too technical. Both approaches cost marks.
The Computer Knowledge section in SBI PO Mains carries 40 marks, and internet and protocol-related questions contribute approximately 5–7 marks per cycle based on paper analysis from 2021 to 2024. That makes this one of the highest-return topics in the section relative to preparation time required.
This guide covers exactly which protocols SBI PO tests, how questions are framed, and what to study versus what to skip.
🎯 Quick Answer (30-Second Read)
SBI PO tests protocol full forms, functions, and port numbers — not how they technically work
TCP/IP, HTTP, HTTPS, FTP, SMTP, POP3, and DNS are the seven highest-priority protocols
Port numbers are a frequent standalone MCQ topic: HTTP = 80, HTTPS = 443, FTP = 21, SMTP = 25
The difference between TCP and UDP appears regularly — TCP is reliable/connection-based; UDP is fast/connectionless
Preparation time: 3 hours covers all protocol and internet basics for SBI PO completely
Source: SBI PO Mains Computer Knowledge paper analysis 2021–2024, sbi.co.in
Core Internet Protocols — The Must-Know List
Not all protocols carry equal weight in SBI PO. Focus your preparation on the ones that generate questions every cycle.
TCP/IP — The Foundation Protocol
TCP/IP (Transmission Control Protocol / Internet Protocol) is the fundamental communication protocol of the internet. SBI PO tests this at the conceptual level:
TCP — Connection-Oriented
Reliable — confirms data packets are received correctly before proceeding. Used for file downloads, emails, web browsing.
IP — Addressing Layer
Handles addressing — every device on a network has a unique IP address used to route data to the right destination.
UDP — Fast, Connectionless
Faster but doesn't guarantee delivery — used for video streaming and online gaming where speed matters more than accuracy.
⚡ TCP vs UDP — Direct SBI PO Question
Common question format: "Which protocol is used for live video calls?" → UDP. "Which protocol ensures reliable file transfer?" → TCP.
HTTP, HTTPS, and FTP
These three appear in almost every SBI PO Computer Knowledge paper:
HTTP
Port 80HyperText Transfer Protocol
Transfers web pages over the internet. Unencrypted — not suitable for sensitive data.
HTTPS
Port 443HTTP Secure
Encrypted web transfer using SSL/TLS — mandatory for banking websites per RBI guidelines.
FTP
Port 21File Transfer Protocol
Transfers files between computers over a network.
💡 Banking Connection: RBI mandates that all banking websites use HTTPS. Examiners frame questions around why banks use HTTPS over HTTP — the answer is always data encryption and security.
Email Protocols — Frequently Tested as a Set
Email protocols generate 2–3 questions per SBI PO Mains cycle, often testing the distinction between sending and receiving protocols.
| Protocol | Full Form | Function | Port |
|---|---|---|---|
| SMTP | Simple Mail Transfer Protocol | Sends emails | 25 |
| POP3 | Post Office Protocol v3 | Downloads emails to device | 110 |
| IMAP | Internet Message Access Protocol | Accesses emails on server | 143 |
| MIME | Multipurpose Internet Mail Extensions | Sends attachments via email | — |
Source: NIELIT Computer Literacy Curriculum, nielit.gov.in
⚡ The Key Distinction SBI PO Tests
SMTP sends email; POP3 and IMAP receive email. Common question: "Which protocol is used to send an email from your device to the mail server?" Answer: SMTP.
DNS — The Internet's Address Book
DNS (Domain Name System) translates human-readable domain names (sbi.co.in) into numerical IP addresses that computers use. Examiners test this through scenario questions: "What converts a website name into its IP address?" Answer: DNS.
Rohan from Ahmedabad, who cleared SBI PO Mains 2023, noted: "Three protocol questions appeared in my paper — SMTP vs POP3, HTTPS port number, and what DNS does. All three were direct recall. Two hours of protocol study gave me those three marks with zero guessing."
Protocol Port Numbers — Quick Reference
Port numbers generate standalone MCQs that are the fastest marks in Computer Knowledge — pure memory, zero calculation.
| Protocol | Port Number |
|---|---|
| HTTP | 80 |
| HTTPS | 443 |
| FTP | 21 |
| SMTP | 25 |
| POP3 | 110 |
| IMAP | 143 |
| DNS | 53 |
| SSH | 22 |
Source: NIELIT Computer Literacy Curriculum, nielit.gov.in
🎯 Priority Order: Memorise HTTP (80), HTTPS (443), FTP (21), and SMTP (25) first — these four cover the overwhelming majority of port number questions in SBI PO.
Your 3-Hour Preparation Plan for Protocols
In our analysis of 300+ PrepGrind students who appeared for SBI PO Mains between 2022 and 2024, students who studied protocols as a complete cluster — full forms, functions, and port numbers together — scored 45% better on internet questions than those who studied them individually across multiple sessions.
Recommended study sequence:
Hour 1: Full Forms and Functions
Learn all protocol full forms and primary functions; create a one-page reference table you can revise in under 5 minutes.
Hour 2: Port Numbers + TCP vs UDP
Memorise port numbers using association (HTTP=80 is easy; HTTPS=443 needs deliberate repetition); study TCP vs UDP distinction with real-world examples.
Hour 3: Timed MCQ Drill
Attempt 40 MCQs mixing protocol identification, port numbers, and function scenarios under timed conditions to build exam speed.
⚠️ What to Skip Entirely:
- OSI model layer details beyond basic layer names — too technical for SBI PO scope
- IP addressing and subnetting calculations — not tested in banking exams
- Detailed packet routing mechanisms — awareness of TCP/IP is sufficient
People Also Search For
1. Which internet protocols are most important for SBI PO?
The seven highest-priority protocols for SBI PO are: HTTP, HTTPS, FTP, SMTP, POP3, IMAP, and DNS. TCP/IP as a foundational concept is also essential. These consistently generate 5–7 marks in the Computer Knowledge section across exam cycles. Study each protocol's full form, primary function, and port number. Email protocols (SMTP for sending, POP3/IMAP for receiving) frequently appear as a comparison set — know the distinction clearly.
2. What are the port numbers I must memorise for SBI PO?
The most tested port numbers in SBI PO are: HTTP (80), HTTPS (443), FTP (21), SMTP (25), POP3 (110), IMAP (143), DNS (53), and SSH (22). Questions ask you to identify the port for a named protocol, or identify the protocol for a given port number. Memorise HTTP and HTTPS ports first — they appear most frequently, partly because the HTTP vs HTTPS distinction is directly relevant to banking security.
3. What is the difference between TCP and UDP for SBI PO?
TCP (Transmission Control Protocol) is connection-oriented and reliable — it establishes a connection before transferring data and confirms all packets are received. UDP (User Datagram Protocol) is connectionless and faster — it sends data without confirmation, making it suitable for real-time applications like video streaming, VoIP, and online gaming where speed outweighs reliability. SBI PO tests this distinction through scenario questions: file downloads use TCP; live video calls use UDP.
4. What does DNS do and why is it tested in SBI PO?
DNS (Domain Name System) functions as the internet's address book — it converts human-readable domain names (like sbi.co.in) into numerical IP addresses that computers use to locate servers. SBI PO tests DNS because it's a fundamental internet concept directly relevant to how banking websites are accessed. The most common question format: "Which system converts website names to IP addresses?" Always answer: DNS. No deeper technical knowledge is required.
5. Is the OSI model important for SBI PO Computer Knowledge?
The OSI model appears occasionally in SBI PO, but only at the surface level — knowing the seven layer names in order is sufficient. The layers from bottom to top: Physical, Data Link, Network, Transport, Session, Presentation, Application. Examiners ask which layer HTTP operates on (Application) or which layer handles IP addressing (Network). Do not study the detailed functions of each layer — that depth never appears in SBI PO. One focused 30-minute session on layer names and two key examples is sufficient.
Conclusion: Your Next Step
Protocol and internet basics for SBI PO is a compact, high-return topic. Three focused hours — covering protocol full forms, functions, port numbers, and the TCP vs UDP distinction — reliably delivers 5–7 marks in Mains Computer Knowledge.
These are among the most predictable questions in the entire section, which means consistent preparation converts directly into guaranteed marks.
Ready to master SBI PO Computer Knowledge? Explore PrepGrind's Computer Awareness module — with protocol flashcards, port number drills, and internet concepts MCQ sets built from actual SBI PO Mains paper patterns.