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A selective repeat ARQ is using 7 bits to represent the sequence numbers. What is the maximum size of the window?
- a)127
- b)128
- c)63
- d)64
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A selective repeat ARQ is using 7 bits to represent the sequence numbe...
With selective repeat ARQ of 7 bits. Maximum window size = 27-1 - 26 = 64 Maximum sequence number = (64 -1) = 63.
Most Upvoted Answer
A selective repeat ARQ is using 7 bits to represent the sequence numbe...
Explanation:
- Selective Repeat ARQ is a type of error control protocol used in data transmission.
- It is used to ensure that the data transmitted by the sender is received correctly by the receiver.
- In selective repeat ARQ, the sender sends a block of data to the receiver, and the receiver sends back an acknowledgement (ACK) to the sender when it receives the data.
- If the sender does not receive an ACK from the receiver within a certain time period, it retransmits the block of data.
- The size of the window in selective repeat ARQ determines the number of blocks of data that can be sent by the sender before waiting for an ACK.
- The maximum size of the window is determined by the number of bits used to represent the sequence numbers.
- For a 7-bit sequence number, the maximum number of sequence numbers that can be represented is 2^7 = 128.
- However, one sequence number is used to represent the end of the window, so the actual number of sequence numbers available for data transmission is 128-1 = 127.
- Since the window size is equal to the number of sequence numbers available for data transmission, the maximum size of the window is 127.
- However, in selective repeat ARQ, the sender and receiver maintain a buffer to store the blocks of data and ACKs, so one sequence number is also used to represent the buffer.
- Therefore, the actual number of sequence numbers available for data transmission is 127-1 = 126.
- Since the window size is equal to the number of sequence numbers available for data transmission, the maximum size of the window is 126.
- Hence, option D is the correct answer.
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