Practice Mode•Instant Explanations & 50:50 Enabled
Internet And Networking MCQs
High-yield multiple choice questions asked in previous years (UPSC, SSC CGL, JKSSB, RRB & State PSCs).
High-Yield Concept Capsule & Key Facts
📌 High-scoring technical networking module across SSC, Banking, JKSSB, and Railways.
Network Topologies, Geographical Classifications & Hardware Devices
- • Geographic Scope: PAN (Personal Area Network - Bluetooth, up to 10m), LAN (Local Area Network - Ethernet within a building), MAN (Metropolitan Area Network - cable TV across a city), WAN (Wide Area Network - Internet spanning countries).
- • Topologies: Star (all nodes connected to central switch/hub; most popular), Bus (single shared backbone cable with terminators at ends), Ring (token passing ring loop), Mesh (every node directly linked to every other node, highest fault tolerance, formula: n(n-1)/2 links).
- • Hardware Peripherals: Hub (Layer 1 broadcast repeater), Switch (Layer 2 intelligent packet forwarder based on MAC address), Router (Layer 3 gateway connecting different subnets using IP addresses), Gateway (translates between dissimilar network protocols).
OSI 7-Layer Model, TCP/IP & Core Application Protocols
- • OSI Model Layers (Bottom to Top): (1) Physical, (2) Data Link (Frames, MAC address, switches), (3) Network (Packets, IP address, routers), (4) Transport (Segments, TCP/UDP port numbers), (5) Session, (6) Presentation (Encryption, compression), (7) Application (End-user services).
- • IP Addressing: IPv4 (32-bit address represented in 4 decimal octets separated by dots, e.g. 192.168.1.1; 4.3 billion addresses) vs IPv6 (128-bit address represented in 8 hexadecimal groups separated by colons).
- • Core Protocol Port Numbers: HTTP (Port 80), HTTPS (Port 443 with TLS/SSL encryption), FTP (Port 20/21), SSH (Port 22), Telnet (Port 23), SMTP (Port 25 - email sending), DNS (Port 53 - domain name to IP resolution), DHCP (Port 67/68), POP3 (Port 110 - email retrieval), IMAP (Port 143).
| Protocol / Acronym | Standard Port | Transport Layer | Primary Operational Purpose |
|---|---|---|---|
| HTTP | Port 80 | TCP | Unencrypted World Wide Web hypertext transfer |
| HTTPS | Port 443 | TCP (SSL/TLS) | Secure encrypted web browser communications |
| DNS | Port 53 | UDP / TCP | Resolves human domain names to numerical IP addresses |
| SMTP | Port 25 | TCP | Simple Mail Transfer Protocol for sending outgoing emails |
| POP3 / IMAP | Port 110 / 143 | TCP | Retrieving incoming emails from remote mail servers |
| DHCP | Port 67 / 68 | UDP | Dynamic Host Configuration - automatically assigns IP addresses |
Showing 15 Practice Questions
Q1IBPS RRB PO 2023Easy
How many total layers are defined in the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) reference model?
Q2SSC CGL 2023Easy
What is the bit length of a standard Internet Protocol version 4 (IPv4) address?
Q3JKSSB Junior Assistant 2021Medium
Which network topology connects every computer node directly to every other node in the network, providing maximum fault tolerance?
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Q4SSC CHSL 2022Easy
Which networking protocol translates human-readable web domain names (like www.google.com) into numerical machine IP addresses?
Q5IBPS Clerk 2022Medium
A MAC (Media Access Control) address, embedded in the Network Interface Card (NIC), is how many bits in length?
Q6JKSSB FAA 2022Easy
Which default TCP port number is utilized for secure, encrypted HTTPS web browsing traffic?
Q7JKSSB VLW 2023Easy
Which device connects multiple disparate computer networks and routes data packets based on their destination logical IP addresses?
Q8SSC CGL Tier-2 2023Medium
Which protocol is responsible for automatically assigning dynamic IP addresses and configuration parameters to client devices on a local network?
Q9IBPS RRB ClerkEasy
Which application layer protocol is specifically used by email clients to send outgoing electronic mail messages to a mail server?
Q10JKSSB Sub-InspectorEasy
In a Star topology network, if the central switch or hub fails completely, what is the consequence to the network?
Q11SSC CGL Tier-2Medium
What is the primary difference between Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)?
Q12JKSSB Patwari 2024Medium
Which of the following IPv4 address blocks is designated as a loopback IP address used by a host to test its own internal network card?
Q13IBPS POMedium
Which layer of the OSI model handles data encryption, decryption, and compression formats (such as SSL, JPEG, MPEG)?
Q14JKSSB Assistant CompilerEasy
What is the bit length of a modern IPv6 internet address?
Q15JKSSB Junior AssistantEasy
Which command-line utility in Windows/Linux is used to verify packet connectivity and measure round-trip latency to a destination host using ICMP echo requests?
Frequently Asked Questions (Internet And Networking)
Q: What is the difference between an IPv4 address and an IPv6 address?
An IPv4 address is 32 bits long, formatted as four decimal octets separated by dots (e.g. 172.16.254.1), yielding approximately 4.29 billion unique addresses. An IPv6 address is 128 bits long, written as eight groups of four hexadecimal digits separated by colons (e.g. 2001:0db8:85a3::8a2e:0370:7334), providing virtually inexhaustible address space.
Q: How does a Layer 2 Switch differ from a Layer 1 Hub?
A Hub is a passive Layer 1 device that repeats any incoming electrical signal to all connected ports (creating collisions and security vulnerabilities). A Switch is an intelligent Layer 2 device that reads the destination MAC address of incoming data frames and forwards them solely to the specific intended recipient port.
Q: Which layer of the OSI model is responsible for end-to-end reliability and flow control?
The Transport Layer (Layer 4) handles end-to-end data transfer, flow control, error checking, and segmentation through protocols like TCP (reliable connection-oriented) and UDP (fast connectionless).
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