1 Calculate the parity bits for even and odd parity 2 points

1 Calculate the parity bits for even and odd parity (2 points)

Calculate the basic checksum, the one’s complement, and the two’s complement for the following blocks of hex numbers (each hex number represents a byte). (2 points each)

E3

F5

1B

A8

5A

90

E0

30

BC

0F

2A

C0

24

FA

E0

04

2   Demonstrate that the IP address 108.235.231.35/22 is a member of the subnet 108.235.228.0 with a subnet mask of 255.255.252.0 (2 points)

3 Demonstrate that the IP address 108.235.232.25/22 is NOT a member of the subnet 108.235.228.0 with a subnet mask of 255.255.252.0 (2 points)

4 Do the long division of 11001101011 by 101 WITH borrows and calculate the remainder. (2 points)

5   Do the long division of 11001101011 by 101 WITHOUT borrows and calculate the remainder. (2 points)

6     Generate the CRC checksum to be transmitted with the data stream 110011010100010101010010 using the divisor 1101. Circle the checksum. Write out the data stream. Perform the long division on the datastream with the checksum and demonstrate that there is no data corruption. (2 points)

110011010100010101010010

7

The original data stream 110011010100010101010010 is transmitted with the divisor 1101. Calculate and circle the remainder. The data stream arrives as below. Check if the data has been corrupted during transmission. (2 points)

    110011010100010101010010(plus remainder)

8

The original data stream 110011010100010101010010 is transmitted with the divisor 1101. Use the remainder from above. The data stream arrives as below. Check if the data has been corrupted during transmission. (2 points)

     110011010100011101010010(plus remainder)

Solution

HEX   Binary
===========================
E3   11100011
F5   11110101
1B   00011011
A8   10101000
5A   01011010
90   10010000
E0   11100000
30   00110000
-----------
10010010101 <- Checksum
01101101010 <- 1\'s complement of the checksum by flipping every bit of checksum
01101101011 <- 2\'s complement of the checksum by adding 1 to the 1\'s complement

HEX   Binary
===========================
BC   10111100
0F   00001111
2A   00101010
C0   11000000
24   00100100
FA   11111010
E0   11100000
04   00000100
-----------
1110110111 <- Checksum
0001001000 <- 1\'s complement of the checksum by flipping every bit of checksum
0001001001 <- 2\'s complement of the checksum by adding 1 to the 1\'s complement

2. Subnet 108.235.228.0 with a subnet mask of 255.255.252.0 has below range of IP addresses
Network: 108.235.228.0
Broadcast: 108.235.231.255

So, we can see that the IP 108.235.231.35 a part of the network as it falls into the range.

3. Subnet 108.235.228.0 with a subnet mask of 255.255.252.0 has below range of IP addresses

Network: 108.235.228.0
Broadcast: 108.235.231.255

So, we can see that the IP 108.235.232.25 not a part of the network as it doesn\'t belong to the network range of above network.