which bit will be set to 1 on all ipv4 packet fragments except the last fragment? a. fragment offset bit b. more segments bit c. don't fragment bit d. packet fragment bit. which field of an ipv4 header is variable in lebgth? a. options b. header checksum c. total length d. IHL. how are errors in an ipv4 packet's encapsulated data detected? a. the ipv4 header checksum field checks for error b. the encapsulated protocvol (tcp, udp) checks for errors c. errors in the encapsulated data cannot be detected. which field will cause the packet to be dropped if it has a value of 0? a. TTL b. DSCP c. IHL d. ECN. what is the fixed binary value of the first field of an ipv4 header? a. 0010 b. 0110 c. 0001 d. 0100.