Paper - II (xiii) — Data and computer networks is a Networking & Web (Senior CI) topic in the RAS/RPSC syllabus. This page gathers exam-style Paper - II (xiii) — Data and computer networks multiple-choice questions with correct answers and explanations, so aspirants can test recall and revise frequently examined concepts.
Practice 44 Paper - II (xiii) — Data and computer networks multiple-choice questions with detailed answers and explanations. Ideal for RAS/RPSC exam preparation.
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Q1. Which device primarily forwards frames inside a LAN by learning MAC addresses, rather than forwarding packets by IP routing tables?
Explanation
A switch operating at Layer 2 builds a table of MAC addresses and forwards frames to the appropriate port, reducing unnecessary flooding compared with a hub. A router's central job is different: it uses network-layer addressing and routing tables to move packets between networks.
Q2. A switch receives an Ethernet frame and forwards it only through the port on which the destination MAC address is reachable. At which layer is this forwarding decision mainly made?
Explanation
A repeater works at the physical layer, a bridge or switch works mainly at the data-link layer, and a router works at the network layer. In Ethernet switching, the device learns source MAC addresses on ports and uses the destination MAC address to decide the outgoing port for a frame.
Q3. A client application needs low overhead and can tolerate occasional loss because the application itself handles timing and retransmission. Which transport protocol choice is most appropriate?
Explanation
UDP gives applications a simple datagram service without TCP's connection establishment, sequencing, retransmission, and flow-control machinery. That lower overhead is useful for traffic where timeliness matters and the application is designed to tolerate or recover from loss. TCP is preferred when reliable ordered byte-stream delivery is required.
Q4. Why does IEEE 802.11 wireless LAN use collision avoidance ideas instead of relying on collision detection exactly like classic shared Ethernet?
Explanation
Wireless media make Ethernet-style collision detection impractical: a station transmitting a strong local radio signal may not reliably hear another station at the same time, and hidden stations can collide at a receiver. IEEE 802.11 therefore uses a collision-avoidance MAC approach with mechanisms such as carrier sensing, backoff, and acknowledgements rather than classic CSMA/CD.
Q5. Which statement about congestion control in packet networks is most accurate?
Explanation
Congestion means the network is offered more traffic than its links, buffers, and routers can handle efficiently. Congestion control mechanisms try to avoid or reduce overload so that delay and packet loss do not rise sharply. It is different from routing, fault repair, or DNS name resolution.
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