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What are the limitations of stop and wait ARQ?
disadvantages of stop-and-wait: fairly slow: the sender can send at most one new packet per RTT. not robust: if the ack can get lost, when the receiver gets a packet, the receiver cannot tell if it is a retransmission or a new packet.
Which one is true in case of stop and wait ARQ?
In stop and wait ARQ, Sender window size is 1. This allows the sender to keep only one frame unacknowledged. So, sender sends one frame and then waits until the sent frame gets acknowledged.
What advantages does go back N ARQ have over stop and wait ARQ?
Go-Back-N ARQ is a more efficient use of a connection than Stop-and-wait ARQ, since unlike waiting for an acknowledgement for each packet, the connection is still being utilized as packets are being sent. In other words, during the time that would otherwise be spent waiting, more packets are being sent.
How go back N ARQ becomes stop and wait ARQ?
Their major flow control protocols – Stop and Wait, Go Back N, and Selective Repeat.
- Stop and Wait – The sender sends the packet and waits for the ACK (acknowledgement) of the packet.
- Go Back N – The sender sends N packets which is equal to the window size.
- Selective Repeat –
Why is selective repeat better than Go back N?
Selective Repeat requires large number of bits in sequence number field. Selective Repeat is far better than Go back N in terms of retransmissions required. Bandwidth requirement is high because even if a single packet is lost, entire window has to be retransmitted.
What is the purpose of stop and wait ARQ?
Stop-and-wait ARQ. Stop-and-wait ARQ, also referred to as alternating bit protocol, is a method in telecommunications to send information between two connected devices. It ensures that information is not lost due to dropped packets and that packets are received in the correct order. It is the simplest automatic repeat-request (ARQ) mechanism.
Is there sorting in the stop and Wait protocol?
And, in stop & wait protocol sorting is not necessary, but in sliding window protocol, sorting may be or may not be necessary. The stop & wait protocol is half-duplex whereas sliding window protocol is full-duplex. The sender node sends a data packet to the receiver node.
What are the problems with stop and wait?
The main problem faced by the Stop and Wait protocol is the occurrence of deadlock due to- Stop and Wait ARQ is an improved and modified version of Stop and Wait protocol. The communication channel is noisy. Errors may get introduced in the data during the transmission.
Which is the simplest Automatic Repeat reQuest ( ARQ )?
It is the simplest automatic repeat-request (ARQ) mechanism. A stop-and-wait ARQ sender sends one frame at a time; it is a special case of the general sliding window protocol with transmit and receive window sizes equal to one in both cases.