Computer Networks

The question asks for the FALSE statement. Option D is clearly FALSE - making voice calls over internet REQUIRES audio input (microphone) to transmit your voice. Options A, B, C describe legitimate requirements for internet calls (IP phone, microphone/speaker, headset). Without a microphone, you can receive audio but cannot send your voice.

USB stands for Universal Serial Bus. It is an industry standard for cables, connectors, and communication protocols used for connection, communication, and power supply between computers and electronic devices. The 'serial' in USB refers to the serial communication protocol it uses.

LAN is a standard networking abbreviation that stands for Local Area Network. It connects computers and devices within a limited geographical area such as a home, school, office building, or campus, allowing them to share resources and information.

LAN stands for Local Area Network, which connects computers and devices within a limited geographical area such as a single building, office, or campus. It allows connected devices to share resources like files, printers, and internet connections.

ISP stands for Internet Service Provider, a company that provides individuals and organizations with access to the internet. ISPs offer various types of internet connectivity including DSL, cable, fiber-optic, and wireless connections.

The simultaneous transmission of data to a number of stations is called broadcasting.

The full duplex communication mode supports data in both directions at the same time.

This impairment in data transmission is the loss of energy as the signal propagates outward.

Mode C transponders automatically transmit pressure altitude information to air traffic control radar systems. This allows ATC to see both your position and your altitude on their displays. Mode A transponders only transmit a 4-digit code, while Mode S transponders provide even more detailed information. Altitude encoding is the key feature that distinguishes Mode C from basic Mode A.

Net telephony (internet-based voice communication) is closely linked to VoIP (Voice over Internet Protocol) technology. VoIP is the underlying technology that enables voice communication over internet networks instead of traditional PSTN (Public Switched Telephone Network). Services like Skype, Vonage, and other internet telephony services use VoIP protocols.

LAN (Local Area Network) connects computers within a limited geographic area like a single building, office, or campus. It does not directly interconnect files or programs - those are stored on the computers themselves. The network connects the devices, not the data directly. Option C correctly identifies LAN's purpose.

A TDM (Time Division Multiplexing) bus is a time division switch that routes data by allocating specific time slots to different channels. Unlike crosspoint switches which use space division, TDM buses share a common medium by time-slicing.

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) prevents collisions through deliberate mechanisms. Unlike ALOHA (which has high collision rates) or CSMA/CD (which detects collisions after they occur), CSMA/CA uses Request to Send/Clear to Send (RTS/CTS) handshaking to reserve the channel and avoid collisions entirely.

The physical layer (Layer 1) of the OSI model is closest to the actual transmission medium, dealing with the physical connection between devices and the transmission of raw bit streams over the medium.

Correct Answer: All of the above