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WorksheetsCOSC85
Total questions: 69
Worksheet time: 35mins
Which statement best defines Data Communications in this course context?
The conversion of analog signals into digital signals
The transmission of digital data between two or more computers
The process of securing data with encryption algorithms
The storage of information in a centralized database
In data communication, which term refers to information presented in a form agreed upon by the parties creating and using it?
Protocol
Telemetry
Data
Signal
Which fundamental characteristic ensures that a system delivers data to the correct destination?
Accuracy
Timeliness
Delivery
Jitter
Jitter in data communications is best described as which of the following?
Loss of packets during transmission
Variation in packet arrival time or uneven delay in audio/video delivery
Encryption delay due to key exchange
Increased bandwidth usage under heavy load
Identify the correct set of components of data communication.
Message, Sender, Receiver, Transmission Medium, Protocol
Data, Accuracy, Timeliness, Jitter, Delivery
Node, Link, Topology, Security, Standards
Router, Switch, Hub, Bridge, Repeater
Which example correctly illustrates Simplex data flow?
Walkie-talkies communicating back and forth
Telephone line allowing simultaneous talking and listening
Keyboard transmitting to a monitor without receiving
Wi‑Fi link enabling bidirectional streaming
Half-Duplex data flow allows which capability?
Only transmit or only receive, but never both
Transmit and receive simultaneously
Transmit and receive, but not at the same time
Broadcast to multiple receivers at the same time
Full-Duplex data flow is exemplified by which medium according to the lesson?
Walkie-talkies
Telephone line
Keyboard-to-monitor link
Fiber-optic broadcast network
Which description best defines a Network in this lecture?
A set of software tools managing databases
A set of devices connected by communication links
A topology diagram used for planning
A protocol suite enabling encryption
What is a Node in networking as introduced here?
A routing algorithm used to discover paths
A computer, printer, or other device capable of sending and/or receiving data on the network
A standardized connector for physical cables
A logical address used for packet delivery
Network reliability in this lecture is measured by which considerations?
Frequency of failure, time to recover from failure, robustness in a catastrophe
Transit time and response time only
Bandwidth and latency under peak load
Number of nodes and links in the topology
Which statement summarizes the focus of Network Security criteria here?
Optimizing routing and switching paths
Protecting data from unauthorized access, damage, and change
Minimizing jitter in audio/video delivery
Ensuring de facto practices become de jure
Which set lists the protocol elements covered in this lecture?
Routing, Switching, Encoding
Syntax, Semantics, Timing
Authentication, Authorization, Accounting
Compression, Encryption, Hashing
Which statement correctly distinguishes de facto from de jure standards?
De facto are legislated by a recognized body; de jure are adopted through widespread use
De facto are adopted through widespread use without an organized body; de jure are legislated by an officially recognized body
Both de facto and de jure are informal practices without official recognition
De jure standards evolve from jitter minimization
In physical structures, what best characterizes a point-to-point link?
A single link shared among multiple devices
A dedicated link between two devices
A wireless broadcast medium covering a campus
A logical grouping of nodes for routing
Which statement describes a multipoint physical structure?
A fiber-optic ring with redundancy
More than two specific devices share a single link
Two devices connected with separate dedicated cables
One device connected to the internet backbone
Network topology, as defined in the lecture, refers to which aspect?
The encryption scheme used for secure communication
The physical and logical relationship of nodes in a network
The performance of protocols under load
The legal status of standards across regions
Which topology connects each device with a dedicated point-to-point link to every other device?
Star topology
Mesh topology
Bus topology
Ring topology
In a star topology, each device has a point-to-point link to which component?
A shared bus cable
Every other device directly
A central controller such as a hub or switch
Only the two neighboring devices
Which statement best defines a bus topology?
Every node attaches to a single shared bus cable
Each device connects to a central router only
Devices form a closed loop with dual paths
All devices connect in a full mesh
Ring topology is characterized by which connection pattern?
Each device connects to a central controller
Each device connects only to the two devices on either side
Each device connects to a single shared backbone cable
Each device connects to every other device
What is a hybrid topology?
A topology with redundant rings only
A mixture or combination of two or more different topologies
A single bus with multiple repeaters
A star topology implemented using wireless links
Which network category connects computers within a small area?
WAN (Wide Area Network)
LAN (Local Area Network)
PAN (Personal Area Network)
SAN (Storage Area Network)
Which network type typically spans a large geographical area?
LAN
MAN
WAN
CAN
Which statement describes a MAN (Metropolitan Area Network)?
Smaller than a LAN and used in homes
Between the size of a LAN and a WAN, often covering a town or city
Global interconnection of autonomous systems
Dedicated storage network within data centers
In networking, what does 'physical' refer to when describing topology?
The data flow in the network
The placement of various nodes
The encryption of data at rest
The logical addressing scheme
Which OSI layer is called the "End User layer" and enables user access and interfaces?
Presentation layer
Session layer
Application layer
Transport layer
Which set lists services provided at the Application layer?
IP, ICMP, ARP
FTP, HTTP, SMTP, TELNET
SSL, TLS, SSH
DNS, DHCP, NTP
Which OSI layer is referred to as the "Syntax layer" and concerns the format and meaning of exchanged information?
Transport layer
Session layer
Application layer
Presentation layer
Which Session layer task adds checkpoints to a stream of data?
Segmentation
Synchronization
Flow Control
Authorization
Which Session layer task allows communication in half-duplex or full-duplex mode?
Dialog Control
Error Control
Translation
Data Compression
Which OSI layer is responsible for process-to-process delivery of the entire message and ensures reliable, ordered data transfer without errors?
Network layer
Transport layer
Session layer
Data Link layer
Which Transport layer task divides data from the session layer into segments?
Segmentation
Flow Control
Error Control
Translation
Which statement about TCP is accurate based on the material?
TCP is connectionless and does not provide feedback
TCP is connection-oriented and supports retransmission of lost data
TCP operates at the Network layer and routes packets
TCP is used only for voice over IP applications
According to the material, which common activities use TCP?
Internet surfing, Emails, FTP
Routing updates, ARP resolution, ICMP messages
Real-time video streaming exclusively
Bluetooth device pairing
Which task belongs to the Presentation layer and enhances security, e.g., via SSL?
Encryption
Authorization
Authentication
Flow Control
Which Session layer task determines if the user has permission to access a file?
Authentication
Authorization
Encryption
Synchronization
Flow control at the Transport layer primarily aims to do what?
Compress data to save bandwidth
Control the amount of data sent so as not to overwhelm the receiver
Translate data into a common format
Verify user credentials
Which layer provides authentication of the user as listed in the tasks?
Application layer
Session layer
Presentation layer
Transport layer
Which term best matches the description: concerned with the syntax and semantics of the information exchanged?
Application layer
Transport layer
Presentation layer
Network layer
Which topology description matches "each device has a dedicated point-to-point link only to a central controller"?
Mesh topology
Ring topology
Star topology
Bus topology
Which function is NOT listed as a Session layer task?
Dialog Control
Synchronization
Data Compression
Authentication
Which statement correctly contrasts LAN and WAN as defined?
LAN covers a large geographical area; WAN is limited to a small office
LAN connects computers in a small area; WAN extends over a large geographical area
Both LAN and WAN only operate within a single building
WAN is smaller than a MAN
At the Network layer, what are the data units called?
Frames
Packets
Segments
Bits
Which task at the Network layer involves assigning sender and receiver IP addresses to each segment?
Routing
Path determination
Logical addressing
Framing
Routing at the Network layer primarily focuses on which action?
Moving data packets from source to destination based on logical addresses.
Encoding bits into signals for transmission.
Dividing streams into frames to prevent overflow.
Assigning MAC addresses to devices.
Which protocol characteristic matches UDP as described?
Connection-oriented with delivery feedback
Connectionless and provides no feedback on delivery
Reliable with guaranteed sequencing
Used only for file transfers
Which is a typical use case listed for UDP?
Database replication
Email delivery
Streaming and voice calls
Secure file transfer
Which statement correctly defines the role of the Data Link layer?
It converts binaries into electrical, radio, or optical signals.
It receives packets from the network layer and organizes them into frames while handling MAC addressing and flow/error/access control.
It assigns IP addresses and determines routing paths like OSPF or BGP.
It synchronizes sender and receiver clocks.
Which Data Link layer task adds mechanisms to detect and retransmit damaged or lost frames?
Physical addressing
Framing
Error control
Access control
At the Data Link layer, physical addressing assigns addresses of which type to both devices?
IPv4/IPv6 addresses
Port numbers
MAC addresses
VLAN IDs
Which statement defines the Physical layer’s primary role?
Transmits data segments between networks.
Receives packets and organizes them into frames.
Converts binaries (bits) into signals for transmission using electrical, radio, or optical media.
Assigns MAC addresses to devices.
Which Physical layer definition concerns the duration of a bit?
Representation of bits
Data rate
Line configuration
Transmission mode
Which Physical layer definition ensures sender and receiver clocks are aligned?
Physical topology
Synchronization of bits
Line configuration
Representation of bits
Which Physical layer concept describes how devices connect to the media?
Line configuration
Transmission mode
Representation of bits
Logical addressing
According to the definitions, which item specifies how devices are connected to make a network?
Synchronization of bits
Physical topology
Data rate
Access control
Which statement correctly characterizes analog data versus digital data?
Analog data have discrete states; digital data are continuous.
Analog data are continuous and take on continuous values; digital data have discrete states and discrete values.
Analog data are square waves; digital data are sine waves.
Analog data can only have two values; digital data have infinite values.
Which statement correctly characterizes analog signals versus digital signals?
Analog signals carry binary data and are square waves; digital signals are continuous sine waves.
Analog signals have an infinite number of values in a range and are continuous sine waves; digital signals have a limited number of defined values and are square waves carrying binary data.
Both analog and digital signals have infinite possible values.
Digital signals are always electromagnetic noise and not used for transmission.
In the context of periodic analog signals, which description matches a simple signal?
A sine wave that cannot be decomposed into simpler signals
A waveform composed of multiple sine waves
A rectangular pulse with repeating cycles
A composite signal exhibiting multiple frequencies
What is the peak amplitude of a signal?
The number of cycles per second
The absolute value of the signal's highest intensity, proportional to the energy it carries
The position of the waveform relative to time 0
The time a signal needs to complete one cycle
If a signal has a frequency of 250 Hz, what is its period?
0.25 s
0.004 s
4.0 s
0.0025 s
Which property describes the position of a waveform relative to time 0?
Amplitude
Phase
Frequency
Wavelength
Which plot shows changes in signal amplitude with respect to time?
Phase-domain plot
Time-domain plot
Frequency-domain plot
Wavelength-domain plot
Which plot is concerned only with the peak value and the frequency?
Time-domain plot
Composite-domain plot
Frequency-domain plot
Amplitude-domain plot
Which statement correctly defines bandwidth for a composite signal?
The number of cycles per second of the highest frequency component
The range of frequencies contained in a composite signal
The absolute value of the peak amplitude
The time it takes for one cycle to complete
Using the bandwidth formula B = f_h − f_l, what is the bandwidth if f_h = 18 kHz and f_l = 2 kHz?
16 Hz
20 kHz
18 kHz
16 kHz
Which signal type changes without exhibiting a repeating pattern or cycle?
Periodic signal
Aperiodic (non-periodic) signal
Simple signal
Composite signal
A composite signal is analyzed in the frequency domain. Which pair of attributes is most relevant to this analysis?
Amplitude over time and wavelength
Peak value and frequency
Period and phase shift
Energy and transmission medium
A waveform completes 500 cycles each second. Which statement is accurate?
Its frequency is 500 Hz and its period is 0.002 s
Its frequency is 500 Hz and its period is 2 s
Its frequency is 0.5 Hz and its period is 500 s
Its frequency is 500 Hz and its period is 0.2 s
