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Computer & Digital Awareness15 Concepts & Facts

Computer Networks, TCP/IP Architecture & Cybersecurity Protocols GK Questions & Answers

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Computer networking architecture provides the structured engineering framework for global telecommunications and distributed information exchange. Established by the International Organization for Standardization (ISO) in 1984, the Open Systems Interconnection (OSI) reference model stratifies network functions into seven conceptual layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. In operational networks, the four-layer Transmission Control Protocol/Internet Protocol (TCP/IP) model, originating from the United States Defense Advanced Research Projects Agency (DARPA) ARPANET project in 1969, governs implementation through its Network Access, Internet, Transport, and Application layers. Network arrangements rely on specific physical and logical topologies, including bus, ring, star, and mesh configurations, each varying in fault tolerance and cabling complexity.

Data transmission across internetworks relies on standardized addressing schemas and transport protocols. Internet Protocol version 4 (IPv4) employs 32-bit numerical addresses formatted as four dotted-decimal octets, providing approximately 4.3 billion unique identifiers, whereas Internet Protocol version 6 (IPv6) utilizes 128-bit addresses formatted as eight colon-separated hexadecimal groups to overcome address exhaustion. At the transport layer, Transmission Control Protocol (TCP) guarantees reliable, ordered byte-stream delivery via a three-way handshake mechanism (SYN, SYN-ACK, ACK), incorporating flow control and error recovery. In contrast, User Datagram Protocol (UDP) operates as a connectionless protocol prioritizing low-latency delivery for real-time video streaming, DNS queries over port 53, and voice communications without verification retransmissions.

Application layer protocols manage end-user internet services across designated transport ports. Unencrypted hypertext transfer occurs over HTTP via port 80, whereas secure web communication utilizes HTTPS across port 443, employing Transport Layer Security (TLS) and Secure Sockets Layer (SSL) encryption protocols based on public key cryptography. File Transfer Protocol (FTP) operates on ports 20 and 21, Secure Shell (SSH) provides remote console encryption on port 22, and Simple Mail Transfer Protocol (SMTP) routes outbound electronic mail on port 25. Perimeter network defense is maintained by firewalls implementing packet filtering, stateful inspection, and proxy gateway inspection. Comprehensive understanding of OSI layering, port numbers, protocol operations, and addressing schemes represents an essential technical module for SSC CGL, UPSC Information Technology, and banking examinations.

Key Concepts & Self-Assessment15 Key Facts

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#1
The OSI model comprises 7 hierarchical layers (Physical, Data Link, Network, Transport, Session, Presentation, Application).
#2
IPv4 uses 32-bit addresses written in dotted decimal format, while IPv6 uses 128-bit addresses written in colon-separated hexadecimal notation.
#3
TCP provides reliable, ordered, and error-checked byte-stream delivery via a three-way handshake (SYN, SYN-ACK, ACK).
#4
DNS (Domain Name System) operates at the application layer, resolving human-readable domain names into machine-routable IP addresses.
#5
HTTPS encrypts web traffic at the transport layer using TLS/SSL cryptography over default port 443, securing data against interception.
#6
The ARPANET, funded by the United States Advanced Research Projects Agency, sent its inaugural host-to-host message on October 29, 1969, adopting TCP/IP protocols on January 1, 1983.
#7
User Datagram Protocol (UDP) operates at the transport layer without establishing prior connections or acknowledging delivery, prioritizing low latency for video streaming and VoIP.
#8
The Address Resolution Protocol (ARP) maps 32-bit logical IP addresses to 48-bit physical Media Access Control (MAC) addresses on local area network segments.
#9
Section 66A of India's Information Technology Act, 2000, which criminalized offensive online communications, was struck down as unconstitutional by the Supreme Court in Shreya Singhal v. Union of India (2015).
#10
The Indian Computer Emergency Response Team (CERT-In) was established under Section 70B of the Information Technology Act, 2000 as the national nodal agency for cybersecurity incident response.
#11
Asymmetric public-key cryptography, such as RSA (Rivest-Shamir-Adleman), utilizes distinct mathematical key pairs consisting of a public key for encryption and a private key for decryption.
#12
Phishing involves social engineering deceptions where malicious actors impersonate legitimate entities via fraudulent electronic communications to steal credentials and financial data.
#13
Distributed Denial of Service (DDoS) attacks overwhelm network bandwidth or web servers with massive floods of malicious traffic generated by compromised botnets.
#14
The dynamic allocation of IP addresses in local networks is managed by the Dynamic Host Configuration Protocol (DHCP) operating across UDP ports 67 and 68.
#15
Virtual Private Networks (VPNs) establish encrypted tunnels across public networks using tunneling protocols such as IPsec, OpenVPN, or WireGuard to safeguard user data integrity.

Subject Specialist Commentary

Analytical perspective & practical exam advice from the Master10 academic board

Educator's Insight
Computer networks connect digital devices to exchange data and access resources across global communication channels. Network communication follows the theoretical seven-layer OSI model and the practical TCP/IP suite. The Transmission Control Protocol ensures reliable data transmission through a three-way handshake, while the Domain Name System translates website names into machine-readable IP addresses. To protect online privacy, HTTPS encrypts web traffic over port 443 using TLS cryptography to prevent unauthorized data interception.
In SSC CGL, banking, and UPSC exams, questions often test networking protocols and cybersecurity legislation. Remember that IPv4 utilizes 32-bit addresses, whereas IPv6 expands capacity with 128-bit addresses. A frequent MCQ trap tests transport protocols: TCP guarantees verified packet arrival, whereas UDP prioritizes low latency without delivery confirmations. For exam revision on Indian cyber laws, remember that CERT-In acts as the national incident response agency under the IT Act, and the Supreme Court struck down Section 66A in the Shreya Singhal verdict.

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