background image
732 Appendix A: Answers to the "Do I Know This Already?" Quizzes and Q&A Sections
15
Given the IP address 190.1.42.3 and the mask 255.255.255.0, what is the broadcast
address?
The broadcast address is 190.1.42.255. The binary algorithm math is shown in the table
that follows.
16
Given the IP address 200.1.1.130 and the mask 255.255.255.224, what is the broadcast
address?
The broadcast address is 200.1.1.159. The binary algorithm math is shown in the table that
follows.
17
Given the IP address 220.8.7.100 and the mask 255.255.255.240, what is the broadcast
address?
The broadcast address is 220.8.7.111. The binary algorithm is shown in the table that
follows.
Address
190.1.42.3
1011 1110 0000 0001 0010 1010 0000 0011
Mask
255.255.255.0
1111 1111 1111 1111 1111 1111 0000 0000
Result
190.1.42.0
1011 1110 0000 0001 0010 1010 0000 0000
Broadcast
Address
190.1.42.255
1011 1110 0000 0001 0010 1010 1111 1111
Address
200.1.1.130
1100 1000 0000 0001 0000 0001 1000 0010
Mask
255.255.255.224
1111 1111 1111 1111 1111 1111 1110 0000
Result
200.1.1.128
1100 1000 0000 0001 0000 0001 1000 0000
Broadcast
Address
200.1.1.159
1100 1000 0000 0001 0000 0001 1001 1111
Address
220.8.7.100
1101 1100 0000 1000 0000 0111 0110 0100
Mask
255.255.255.240
1111 1111 1111 1111 1111 1111 1111 0000
Result
220.8.7.96
1101 1100 0000 1000 0000 0111 0110 0000
Broadcast
Address
220.8.7.111
1101 1100 0000 1000 0000 0111 0110 1111
apA.fm Page 732 Monday, March 20, 2000 5:24 PM