madeeasytest series

Question

Station X needs to send a message consisting of 12 packets to Station Y using a siding window (window size 4) and go­back­n error control strategy. All packets are ready and immediately available for transmission. If every 7 th packet that X transmits gets lost (but no acks from Y ever get lost), then the number of packets that X will transmit for sending the message to Y are _______.

Comments

https://gateoverflow.in/70792/flow-control

Answer 1

I think answer should be 19. And the sequence of packets goes like this...

1 2 3 4 5 6 7 8 9 10 7 8 9 10 11 12 10 11 12

Comments

yes,i also got same ans, but madeeasy was 18.