minimum number of bits

minimum number of bits
1. What is the minimum number of bits sent at the data link layer level (using Ethernet) to accomplish the task?
2. What is the ratio of the useful bits to the total bits.
3. Interpret the following sequences of characters (in hexadecimal) received by a TELNET client or server.
a. FFFB 01
b. FFFEOI
c. FFF4
d. FFF9
minimum number of bits