36 Questions
What is the main goal of reliability in data transfer?
Ensuring no data loss or bit errors
What is the function called for ensuring reliable data transfer?
Reliable Data Transfer (rdt)
How are sender and receiver sides of reliable data transfer protocol developed?
Using Finite State Machines (FSMs)
What is the role of finite state machines (FSM) in reliable data transfer?
To specify sender and receiver states
In reliable data transfer, what determines the next state of the sender and receiver?
Next event or action taken on state transition
What does reliable data transfer aim to achieve with regards to data loss and bit errors?
Minimizing both data loss and bit errors
What does rdt2.0 use to detect bit errors in the channel?
Checksum
What does the receiver explicitly tell the sender if the packet is received OK?
ACK
What does the receiver explicitly tell the sender if the packet had errors?
NAK
What does the sender do on receipt of a NAK?
Retransmits the packet
What feedback messages are used in rdt2.0 for error detection?
ACK and NAK
What happens if ACK/NAK is not received in rdt2.0?
Possible duplicate handling
What mechanism does rdt2.0 use to handle duplicates?
Sender adds sequence number
What does the receiver do if a duplicate packet is received in rdt2.0?
(Doesn't deliver up) Discards the duplicate packet
What does the sender do after sending one packet in rdt2.0?
(Doesn't deliver up) Waits for retransmission
What is used by rdt2.0 to detect if a packet was received without errors?
Checksum.
If ACK/NAK is not received at sender end in rdt2.0, what will happen?
Automatic retransmission.
How does rdt2.0 handle a scenario where ACK/NAK is not received at sender's end?
Retransmits current pkt.
What is the main objective of reliable data transfer?
Avoiding data loss and bit errors
In reliable data transfer, what determines the next state of the sender and receiver?
Finite state machines (FSM)
What is the function called for ensuring reliable data transfer?
Reliable data transfer (rdt)
What does the receiver explicitly tell the sender if the packet is received without errors?
ACK
What feedback messages are used in reliable data transfer for error detection?
ACK/NAK
What does rdt2.0 use to detect bit errors in the channel?
Checksums
What does rdt2.0 use to recover from errors in the channel?
Both ACKs and NAKs
What is the fatal flaw in rdt2.0 if ACK/NAK is not received?
The sender retransmits current packet
What is used in rdt2.0 to detect bit errors in the channel?
Checksum
What is the role of acknowledgements (ACKs) in rdt2.0?
To explicitly tell the sender that the packet was received OK
What feedback messages are used in rdt2.0 for error detection?
Control messages (ACK,NAK)
What additional mechanism does rdt2.0 have beyond rdt1.0 for error detection during conversation?
Error detection feedback
What does the receiver do if a duplicate packet is received in rdt2.0?
Discard and not deliver up the duplicate packet
What happens if the ACK/NAK is not received at the sender's end in rdt2.0?
The sender retransmits current packet
What is the function called for ensuring reliable data transfer?
rdt_send(data)
What is the main goal of reliability in data transfer?
To ensure no bit errors or loss of packets in the channel
What determines the next state of the sender and receiver in reliable data transfer?
Control messages (ACK,NAK)
What does the sender do after sending one packet in rdt2.0?
Waits indefinitely for a response from the receiver
This quiz covers the principles of reliable data transfer in computer networks, addressing concepts such as flow control, congestion control, and the prevention of data loss and bit errors. It also discusses the function of 'Reliable data transfer (rdt).'
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