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Computer Networks · Question Set
Wireless & Mobile Networking interview questions for placements and exams.
Questions
13
Included in this set
Subject
Computer Networks
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Difficulty
Mixed
Level of this set
Go through each question and its explanation. Use this set as a focused practice pack for Computer Networks.
Frequency reuse allows non-adjacent cells to operate on the same frequency bands, maximizing spectrum efficiency. Proper planning ensures signals from reused frequencies do not interfere with each other.
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Wireless networks use electromagnetic waves to transmit data through the air, removing the need for cables. This allows mobility, flexibility, and ease of setup in environments where wiring is difficult or costly.
IEEE 802.11 defines wireless LAN (Wi-Fi) standards. It specifies how devices communicate wirelessly using radio waves in the 2.4 GHz or 5 GHz bands. Variants like 802.11n, 802.11ac, and 802.11ax improve speed and range.
A cellular network divides geographic areas into small regions called cells, each served by a base station. Mobile devices communicate with the nearest base station, which connects to a switching center for call routing or Internet access. As users move between cells, handover mechanisms maintain uninterrupted connectivity. This design allows efficient frequency reuse and broad coverage.
Handover is the process where an ongoing call or data session is transferred from one cell’s base station to another as the user moves. It ensures seamless connectivity without drops. There are two main types: hard handover (break before make) and soft handover (make before break). Smooth handovers are crucial for uninterrupted mobile communication, especially in fast-moving environments like vehicles.
Bluetooth is based on the IEEE 802.15.1 standard. It supports short-range communication using low-power radio waves, typically for personal area networks connecting devices like phones, headsets, and keyboards.
An ad hoc network is self-organizing, where devices connect directly to each other to exchange data without relying on routers or access points. It’s useful in temporary or emergency setups like disaster recovery operations.
Mobile IP allows devices to keep a consistent IP address even when they move between networks. It does this through a home agent that forwards packets to the device’s current location via a care-of address. This ensures uninterrupted sessions for mobile users without needing to reconfigure IP settings.
WPA3 is the most recent and secure Wi-Fi security protocol. It replaces the outdated WEP and improves on WPA2 by offering stronger encryption, forward secrecy, and protection against brute-force attacks.
Satellite communication uses orbiting satellites as relay stations to transmit signals between distant locations. Uplink sends data to the satellite, which retransmits it down to ground stations (downlink). Advantages include global coverage and quick deployment. However, it faces issues like high latency, signal loss during weather changes, and expensive equipment. Still, it’s crucial for remote regions and broadcasting.
5G networks offer ultra-low latency (around 1 ms), high throughput, and support for massive device connectivity. It enables advanced applications like IoT, autonomous vehicles, and real-time cloud gaming.
Wi-Fi networks offer high-speed connectivity in limited areas like homes or offices, often at lower cost since they use local broadband connections. Cellular networks provide broader coverage through telecom infrastructure and support mobility but may have higher costs and usage limits. In interviews, emphasize how modern devices seamlessly switch between both for optimal connectivity.
An access point connects wireless clients to a wired network infrastructure. It allows mobile users to connect and move within the network’s range. Access points form the backbone of wireless LAN architecture.