A channel is using a sliding window protocol with window size 2 to send 5 packets from sender S to receiver R, assume the second data packet and the first ACK are lost: How many data packets are sent (including retransmissions)? How many ACKS are sent (including the lost ACK) (assume one ack per packet and rtx on timeouts only) Type of Protocol Number of data Packets= Number of ACKS Packets Go-back-n Selective Repeat = A framing system that uses stuffing is sending frames of 100 bytes payload each. For frames that have the FLAG byte repeated 5 times on it (no ESC, no 5 consecutive 1 bits), what would be the payload overhead (as percentage of payload) added by stuffing? Type of Framing Used Byte Stuffing Bit Stuffing % Overhead In a CDMA system the following (orthogonal) chip sequences are used: A= (-1,-1,-1,+1,+1,-1,+1,+1); B = (-1,-1,+1,-1,+1,+1,+1,-1); C = (-1,+1,-1,+1,+1,+1,-1,-1); D = (-1,+1,-1,-1,-1,-1,+1,-1) For the following signals transmitted through the channel: S1= (0, 0, +2, -4, -2, 0, +2, -2) and S2 = (-4,0,-2,0,+2,0,+2,-2) What are the signal-specific values of the bits transmitted via each chip sequence? Bit (0 or 1) Formula to find bit(X) Operation Bit(A) (S1) = Bit(B) (S1)= Bit(B) (S2)= Bit(C) (S2)= Bit(D) (S2)= What are the names to describe the unit of data transfer for the OSI layers between (and including) Data link layer and Presentation layer: Layer Data Transfer Unit 2.-Mention five types of guided transmission media: