MCQ
Paper - II (xiii) — Data and computer networks MCQ - Practice Questions with Answers
Solve 44 Paper - II (xiii) — Data and computer networks questions for RAS/RPSC preparation.
Practice questions
Q1Which device primarily forwards frames inside a LAN by learning MAC addresses, rather than forwarding packets by IP routing tables?
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.
Q2A 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?
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.
Q3A 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?
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.
Q4Why does IEEE 802.11 wireless LAN use collision avoidance ideas instead of relying on collision detection exactly like classic shared Ethernet?
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.
Q5Which statement about congestion control in packet networks is most accurate?
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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More questions
6Which OSI layer is primarily responsible for routing packets between different networks and choosing a path to the destination?
7Which multiplexing technique is best described as assigning different time slots on the same physical channel to different data streams?
8A network application needs ordered, reliable byte-stream delivery with acknowledgements and retransmission. Which transport protocol is the appropriate choice?
9In the OSI reference model, which layer is primarily responsible for framing, physical addressing, and error detection over a single link?
10In a fibre-optic backbone, several independent optical carrier signals of different wavelengths are combined on the same fibre. Which physical-layer multiplexing technique is being used?
11Which pairing of IEEE 802 LAN technologies is correctly matched with its traditional medium access idea?
12In IPv4 forwarding, what is the main purpose of the Time To Live (TTL) field in the IP header?
13A 3000-byte IPv4 datagram has to pass through a link whose MTU is smaller than the datagram size, and the Don't Fragment flag is not set. Which statement best describes the IP-layer action?
14In physical-layer multiplexing, which technique assigns different users or channels separate recurring time slots on the same link?
15In the OSI reference model, which layer is primarily responsible for end-to-end process communication with segmentation, sequencing support and flow/error control services?