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Problem 1. [Points: 2X2] A Trivial File Transfer Protocol (TFTP) uses UDP and is employed for downloading new code to Internet appliances such as router, switch etc. Consider a scenario in which Host A sends the TFTP data dn to Host B and, in return, expects an ACK an from B. Explain clearly with proper illustration how does Host A recover from loss/error in (i) data dn and (ii) ACK an