WorksheetsData Communication Quiz 2
Total questions: 35
Worksheet time: 6mins
In data communication, the term "throughput" refers to:
The theoretical maximum data rate
The actual data rate achieved over a network
The propagation speed of signals
The latency in data transmission
What is the main purpose of protocols in data communication?
Maximizing bandwidth
Enhancing signal quality
Defining rules for data exchange
Establishing physical connections
Which of the following is not a component of a data communication system?
Transmitter
Medium
Protocol
Buffer
What defines the physical topology of a network?
Type of signals used
Arrangement of devices and links
Protocols implemented
Transmission mode
Latency in a communication system is affected by:
Bandwidth only
Distance only
Propagation, transmission, and processing delays
Number of devices connected
In the OSI model, which layer handles end-to-end communication and reliability?
Data Link Layer
Session Layer
Transport Layer
Network Layer
The main responsibility of the presentation layer in the OSI model is to:
Establish connections
Route data packets
Provide data format conversion and encryption
Manage error correction
Which protocol is used at the transport layer in the TCP/IP model?
IP
FTP
TCP and UDP
ARP
Encapsulation of data at the network layer involves adding:
Session headers
IP headers
Transport headers
Ethernet headers
Which of the following OSI layers is absent in the TCP/IP model?
Data Link
Network
Session
Application
Which technique combines multiple signals into one and separates them later?
Modulation
Multiplexing
Encoding
Compression
In TDM, time slots are assigned to users:
Based on demand
Randomly
Sequentially and cyclically
Proportional to data size
The Nyquist theorem is used to calculate:
Minimum frequency
Maximum data rate for a noiseless channel
Bandwidth efficiency
Signal-to-noise ratio
In FDM, guard bands are used to:
Increase bandwidth efficiency
Prevent distortion
Avoid overlapping between channels
Enhance modulation
Which bandwidth utilization technique is used in CDMA systems?
FDM
Spread spectrum
TDM
WDM
Which of the following is a guided transmission medium?
Satellite
Microwave
Fiber-optic cable
Infrared
Which factor primarily limits the bandwidth of twisted-pair cables?
Resistance
Crosstalk
Impedance
Signal reflection
The main advantage of fiber-optic cables over copper cables is:
Lower cost
Higher data rates and immunity to EMI
Ease of installation
Better compatibility with existing hardware
Which type of wireless transmission requires line-of-sight?
Bluetooth
Microwave
Infrared
Satellite
The attenuation in coaxial cables is mainly caused by:
Crosstalk
Signal absorption and scattering
Impedance mismatch
Interference
Ethernet primarily uses which access method?
Token passing
CSMA/CD
Polling
Demand priority
Which of the following is true for Gigabit Ethernet?
Operates only in full-duplex mode
Uses coaxial cables exclusively
Supports both full-duplex and half-duplex modes
Requires special network protocols
In Ethernet frames, the preamble is used for:
Error checking
Synchronization
Addressing
Multiplexing
The primary difference between a switch and a hub is:
Transmission speed
Switch operates on MAC addresses, while hub broadcasts to all ports
Compatibility with devices
Error detection capability
In Ethernet, the maximum frame size (without jumbo frames) is:
512 bytes
1024 bytes
1518 bytes
2048 bytes
The 802.11 standard is associated with:
Fiber-optic networks
Bluetooth communication
Wireless LANs
Cellular networks
What modulation technique is used in IEEE 802.11g?
ASK
OFDM
QAM
DSSS
What is the purpose of RTS/CTS in wireless communication?
Enhance speed
Avoid collisions in a shared medium
Improve encryption
Increase range
The maximum theoretical data rate for 802.11n is:
54 Mbps
600 Mbps
300 Mbps
1 Gbps
The hidden station problem in wireless LANs occurs when:
Signals interfere due to reflection
Two stations cannot detect each other's signals
Devices fail to authenticate
Access points overlap
The primary purpose of a bridge is to:
Route data between networks
Divide a LAN into smaller segments
Increase bandwidth
Encrypt transmitted data
A VLAN is implemented to:
Improve physical connectivity
Logically group devices regardless of physical location
Enhance IP routing
Restrict network size
Which protocol is used for VLAN trunking?
Ethernet
802.1Q
TCP
SNMP
In a star backbone network, devices are connected using:
Full-duplex mode
Mesh topology
A central hub or switch
Serial links
The primary function of a router is to:
Transmit signals
Connect devices in a LAN
Route packets between different networks
Assign MAC addresses
