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The IP datagram for a TCP ACK message is 42 Bytes (2 bytes data+20 bytes of TCP header-20 bytes of IP header). Assume this ACK is crossing an ATM network (10 Points) How many ATM cells will it take to carry the ACK if: a) the AAL3/4 is used? b) the AAL 5 is used? Figure 15 AAL3/4 SAR CS header C Cs tailer 16 L Lengh ST Segment tye SAR head 18.18 Figure 16 AALS cs SAR 48 bytes 48 bytes 48 bytes 5 48 bytes 48 bytes 5 48 bytes UU Channel identiher CPt Common part identifier L Length CRC: Error detector CRC 32 CS trailer UU CPS 8 816