Remarks:

1. Each of ACK and CTS frames has 14 bytes, while RTS has 20 bytes.

2. PLCP long preamble length is 144 bits while short preamble is 72 bits. PLCP header is of length 48 bits.

Assume that there are 1600 bytes of upper layer packet to be transmitted without using RTS/CTS protection. For the following fragmentation calculations, assume that the network is using WEP encryption, which needs an 8-bytes code at the end of MPDU. Other information is provided in the following table. (40 pts) MAC Header 24 bytes 802.2 LLC 3 bytes SNAP Header 5 bytes Payload L3+ 1600 bytes WEP encryption 8 bytes Let's set the AP fragmentation threshold as 600 bytes, that is, this message is transmitted with fragmentation with a frame size of 600 bytes or less. Assume that we are using 802.11b with HR/DSSS long preamble, which 1-Mbps DBSK is applied to both PLCP preamble and PLCP header. PSDU is transmitted using 5.5 Mbps CCK modulation. Answer the following questions. (i) What is NAV value filled in the frame of the first data fragment? (ii) What is the NAV value filled in the first ACK frame? (iii) What is the NAV value filled in the 2nd data fragment? (iv) What is the NAV value filled in the last ACK frame