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WorksheetsUnit 2 - Quiz
Total questions: 30
Worksheet time: 15mins
Which of the following is NOT a service provided by the Data Link Layer to the Network Layer?
Framing
Flow Control
Routing
Error detection
Which of the following is a reliable service that can be provided by the Data Link Layer?
Connectionless service
Acknowledged connection-oriented service
Datagram delivery
Multicast delivery
Which of the following is an advantage of character count framing?
Simple to implement
Resilient to synchronization loss
Immune to bit errors
Does not require byte alignment
Which method is least affected if a single bit is corrupted?
Character count
Byte stuffing
Bit stuffing
None of these
In a stop-and-wait protocol, the sender:
Sends frames continuously without acknowledgment
Waits for acknowledgment before sending the next frame
Sends all frames in a window before waiting
Ignores lost frames
Flow control ensures:
Data is free from errors
Data is delivered in sequence
Sender does not overwhelm the receiver
Transmission speed is always high
Which is NOT a flow control technique?
Stop-and-wait
Sliding window
Piggybacking
Cyclic redundancy check
CRC stands for:
Cyclic Redundancy Code
Cyclic Redundancy Check
Code Redundancy Check
Code Repetition Cycle
Hamming code can:
Only detect errors
Detect and correct single-bit errors
Detect burst errors
Correct multiple-bit errors without detection
Burst errors affect:
Only 1 bit
Consecutive group of bits
Multiple non-consecutive bits
Only start bits
Stop-and-wait protocol is:
Full duplex
Half duplex
Simplex
None of the above
The main drawback of stop-and-wait protocol is:
Complexity
Low utilization of bandwidth for long delays
High error rate
Requires multiple channels
The “ARQ” in stop-and-wait ARQ stands for:
Automatic Repeat Query
Automatic Request Queue
Automatic Repeat reQuest
Automatic Reply Question
Which of the following does NOT occur in stop-and-wait ARQ?
Timer expiration
Acknowledgment reception
Frame pipelining
Frame retransmission
Sliding window protocols allow:
Multiple frames to be sent before acknowledgment
Only one frame at a time
No acknowledgment at all
Frames to be sent in reverse order
In Go-Back-N ARQ, if a frame is lost:
Only that frame is retransmitted
All frames from that frame onward are retransmitted
No frame is retransmitted
Only last frame is retransmitted
Piggybacking means:
Sending acknowledgment in a separate frame
Adding acknowledgment to outgoing data frame
Sending data without acknowledgment
Delaying acknowledgment indefinitely
Ethernet uses which access method?
CSMA/CD
CSMA/CA
Token passing
Polling
Ethernet MAC addresses are:
32-bit
48-bit
64-bit
Variable length
Which field in Ethernet is used for error detection?
Source address
Destination address
CRC
Length
IEEE 802.11 uses which access method?
CSMA/CD
CSMA/CA
Token passing
Polling
Which frequency bands are commonly used in Wi-Fi?
900 MHz and 2.4 GHz
2.4 GHz and 5 GHz
1 GHz and 10 GHz
5 GHz and 60 GHz
Hidden terminal problem occurs when:
AP is too far from the router
The network key is unknown
Two stations cannot hear each other but can hear the AP
Wireless card is faulty
Bluetooth operates in which frequency range?
2.4 GHz ISM band
5 GHz ISM band
900 MHz
60 GHz
Bluetooth network is called a:
LAN
PAN
WAN
MAN
In a Bluetooth piconet, the maximum number of active slave devices is:
4
5
7
8
A device that connects two similar networks at the data link layer is a:
Router
Switch
Repeater
Bridge
A switch operates at which OSI layer?
Physical only
Data Link
Network
Both Physical and Data Link
Which device uses MAC addresses to forward frames?
Router
Switch
Gateway
Repeater
Which device regenerates and amplifies signals?
Repeater
Router
Switch
Bridge
