Internet and Email Questions for SSC CGL

What is the Internet

The Internet is a global network of millions of computers and devices connected together using standardized communication protocols. It is often called the Network of Networks because it links smaller networks (like LANs and WANs) worldwide. The Internet was originally developed as ARPANET by the US Department of Defense in 1969. Tim Berners-Lee invented the World Wide Web (WWW) in 1989, which made the Internet accessible to the public through web pages and browsers.

• Internet is a physical global network; WWW is a service that runs on the Internet
• ARPANET was the origin of the Internet — started in 1969
• Tim Berners-Lee invented WWW in 1989 at CERN
• ISP stands for Internet Service Provider — companies that give you Internet access
• Bandwidth is the amount of data transferred per second — measured in bps, Kbps, Mbps, Gbps
• IP Address uniquely identifies every device on the Internet (like a postal address for your computer)

Key Internet Protocols

Protocols are rules that govern how data is sent and received over the Internet. SSC CGL frequently asks you to match the protocol name to its full form or purpose. Think of protocols as languages — both sender and receiver must speak the same language to communicate. TCP/IP is the foundation of all Internet communication.

• TCP/IP — Transmission Control Protocol / Internet Protocol — the backbone of Internet communication
• HTTP — HyperText Transfer Protocol — transfers web pages from server to browser
• HTTPS — HTTP Secure — encrypted version of HTTP (S = Secure, uses SSL/TLS)
• FTP — File Transfer Protocol — used to upload/download files between computers
• SMTP — Simple Mail Transfer Protocol — sends emails from client to server
• POP3 — Post Office Protocol v3 — downloads emails from server to your device
• IMAP — Internet Message Access Protocol — reads emails on server without downloading
• DNS — Domain Name System — converts domain names (like google.com) into IP addresses

Web Browsers and Search Engines

A web browser is software that retrieves and displays web pages. A search engine is a website or service that indexes web content and returns results for your queries. SSC CGL often confuses aspirants by mixing up browsers and search engines — remember, Chrome is a browser, Google is a search engine.

• Popular browsers: Google Chrome, Mozilla Firefox, Microsoft Edge, Safari, Opera
• Popular search engines: Google, Bing, Yahoo, DuckDuckGo, Baidu
• URL stands for Uniform Resource Locator — the address of a web page
• Homepage is the default page a browser opens when launched
• Cookies are small files stored on your computer by websites to remember preferences
• Cache is temporary storage of web data to speed up future visits

Understanding URLs and Domain Names

Every website has an address called a URL. It has specific parts and SSC CGL loves asking what each part means. Domain extensions (called TLDs — Top Level Domains) tell you the type or country of a website. The DNS system translates these human-readable names into numeric IP addresses.

• URL structure: protocol://domain-name/path — example: https://www.ssc.nic.in/notice
• .com — commercial, .org — organization, .edu — education, .gov — government, .net — network
• Country TLDs: .in (India), .uk (UK), .us (USA), .au (Australia)
• www stands for World Wide Web — it is a subdomain
• IP address format (IPv4): four numbers separated by dots — example: 192.168.1.1
• IPv6 was introduced because IPv4 addresses were running out

Email — Components and Working

Email (Electronic Mail) allows users to send messages over the Internet. An email address has a specific format and every part has a name. The process of sending and receiving email involves different protocols working together. SSC CGL tests both the terminology and the protocols associated with email.

• Email address format: username@domain.extension — example: ravi.sharma@gmail.com
• @ symbol separates the username from the domain — called the at sign
• To: primary recipient, CC: Carbon Copy (others can see), BCC: Blind Carbon Copy (hidden from others)
• SMTP is used to SEND emails; POP3 or IMAP is used to RECEIVE emails
• Attachment is a file sent along with an email message
• Spam is unwanted/junk email; Phishing is a fraudulent email that tries to steal your information

Internet Terminology — Frequently Tested

SSC CGL regularly tests standalone definitions of Internet-related terms. These are pure memory questions and can be answered quickly if you have a list ready. Focus on terms that sound similar or are commonly confused.

• Modem — MOdulator DEModulator — converts digital signals to analog and back for Internet access
• Router — device that routes data packets between networks
• Firewall — security system that monitors and controls incoming/outgoing network traffic
• VPN — Virtual Private Network — creates a secure, encrypted connection over the Internet
• Blog — a regularly updated personal website (short for weblog)
• Podcast — audio content distributed over the Internet
• Hyperlink — a clickable link in a web page that takes you to another page
• Downloading — getting data from Internet to your device; Uploading — sending data from your device to Internet

• Confusing browser with search engine — Chrome and Firefox are browsers; Google and Bing are search engines. SSC deliberately mixes these.
• Mixing up email protocols — SMTP is for SENDING, POP3/IMAP is for RECEIVING. Remember: SMTP = Send Mail To People.
• Confusing Internet with WWW — Internet is the physical network infrastructure; WWW is just one service running on it.
• Thinking BCC recipients are visible to other recipients — BCC means Blind Carbon Copy, the recipient is hidden from everyone else.
• Mixing up Modem and Router — Modem connects you to your ISP; Router distributes that connection within your home/office network.

• SMTP = Send Mail To People — remember this and you will never confuse it with receiving protocols.
• POP3 vs IMAP: POP3 = Pull Off and Permanently delete (downloads to device); IMAP = I May Access from anywhere (stays on server).
• Protocol order in URL: HTTP comes first — think of it as the Handshake before the Talk between browser and server.
• TLD trick — GOV = Government, EDU = Education, ORG = Organization, COM = Commerce — the extension tells the identity.

• SSC CGL Tier 1 typically has 1 to 3 questions from Internet and Email in the Computer Awareness section. These are among the easiest questions if prepared — aim to score full marks here.
• Protocol full forms are asked directly — prepare a quick table of HTTP, HTTPS, FTP, SMTP, POP3, IMAP, TCP/IP, DNS and their purposes.
• Domain extension questions appear regularly — .gov, .edu, .org, .in are most frequently tested. Know what each represents.
• Questions often give a scenario like what happens when you hit Send on an email and ask which protocol is used — the answer is always SMTP.
• Recent papers have included questions on cyber security terms like Phishing, Firewall, VPN — these are increasingly common, so do not skip them.