Reliable data transfer mechanisms in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the protocol that uses acknowledgments to ensure reliable data transfer.

Computer Networks

The protocol that uses [1] to confirm receipt of data is called Stop-and-Wait ARQ.

Drag options to blanks, or click blank then click option'

Achecksums

Btimeouts

Cacknowledgments

Dsequence numbers

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing acknowledgments with timeouts.

Thinking checksums are used to confirm receipt instead of detect errors.

Stop-and-Wait ARQ uses acknowledgments to confirm that data has been received correctly before sending the next packet.

2fill in blank

medium

Complete the code to describe the purpose of sequence numbers in reliable data transfer.

Computer Networks

Sequence numbers are used to [1] packets and detect duplicates in data transfer protocols.

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Acompress

Border

Cencrypt

Ddrop

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming sequence numbers are for encryption.

Confusing sequence numbers with compression techniques.

Sequence numbers help keep track of the order of packets and detect if any duplicates arrive.

3fill in blank

hard

Fix the error in the description of Go-Back-N ARQ protocol.

Computer Networks

In Go-Back-N ARQ, the sender can send multiple packets without waiting for [1] for each one, but must retransmit from the first unacknowledged packet if an error occurs.

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Aacknowledgment

Bchecksum

Ctimeout

Dsequence number

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing acknowledgment with checksum or timeout.

Thinking the sender waits for a timeout before sending next packets.

Go-Back-N ARQ allows sending multiple packets before receiving acknowledgments, but retransmits starting from the first missing acknowledgment.

4fill in blank

hard

Fill both blanks to complete the description of Selective Repeat ARQ.

Computer Networks

Selective Repeat ARQ allows the sender to transmit multiple packets and only retransmits those packets that are [1] or [2].

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Alost

Bdelayed

Ccorrupted

Dduplicated

Attempts:

3 left

💡 Hint

Common Mistakes

Including delayed or duplicated packets as reasons for retransmission.

Confusing lost packets with delayed packets.

Selective Repeat ARQ retransmits only the packets that are lost or corrupted, improving efficiency.

5fill in blank

hard

Fill all three blanks to complete the explanation of how reliable data transfer handles errors.

Computer Networks

Reliable data transfer protocols use [1] to detect errors, [2] to confirm correct receipt, and [3] to resend lost or corrupted packets.

Drag options to blanks, or click blank then click option'

Achecksums

Backnowledgments

Cretransmissions

Dtimeouts

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing timeouts with error detection.

Mixing up acknowledgments and retransmissions.

Checksums detect errors, acknowledgments confirm receipt, and retransmissions resend lost or corrupted packets to ensure reliability.