$[1]$ A $11-$bit Hamming code containing $7$ bits of data and $4$ parity bits is received, what was the original?

$1.00001110101$

$2.10111000011$

$3.10101011101$

$[2]$ Given the $7-$bit data word $0101101$ give the $11$ bit that can correct a single bit error.

$[3]$ Explain CRC and checksum with examples.

$[4]$ Explain NAT briefly

$[5]$ Explain IPv$6$ with an example.

$[6]$ Explain classes of IPv$4.$