734 Appendix A: Answers to the "Do I Know This Already?" Quizzes and Q&A Sections
23
Given the IP address 190.1.42.3 and the mask 255.255.255.0, what are the assignable IP
addresses in this subnet?
The subnet number is 190.1.42.0, and the subnet broadcast address is 190.1.42.255. The
assignable addresses are all the addresses between the subnet and broadcast addresses,
namely 190.1.42.1 to 190.1.42.254.
24
Given the IP address 200.1.1.130 and the mask 255.255.255.224, what are the assignable
IP addresses in this subnet?
The subnet number is 200.1.1.128, and the subnet broadcast address is 200.1.1.159. The
assignable addresses are all the addresses between the subnet and broadcast addresses,
namely 200.1.1.129 to 200.1.1.158.
25
Given the IP address 220.8.7.100 and the mask 255.255.255.240, what are the assignable
IP addresses in this subnet?
The subnet number is 220.8.7.96, and the subnet broadcast address is 220.8.7.111. The
assignable addresses are all the addresses between the subnet and broadcast addresses,
namely 220.8.7.97 to 220.8.7.110.
26
Given the IP address 140.1.1.1 and the mask 255.255.255.248, what are the assignable
IP addresses in this subnet?
The subnet number is 140.1.1.0, and the subnet broadcast address is 140.1.1.7. The
assignable addresses are all the addresses between the subnet and broadcast addresses,
namely 140.1.1.1 to 140.1.1.6.
27
Given the IP address 167.88.99.66 and the mask 255.255.255.192, what are the
assignable IP addresses in this subnet?
The subnet number is 167.88.99.64, and the subnet broadcast address is 167.88.99.127.
The assignable addresses are all the addresses between the subnet and broadcast
addresses, namely 167.88.99.65 to 167.88.99.126.
28
Given the IP address 134.141.7.7 and the mask 255.255.255.0, what are all the subnet
numbers if the same (static) mask is used for all subnets in this network?
The Class B network number is 134.141.0.0. The mask implies that the entire third octet,
and only that octet, comprises the subnet field. Essentially, the subnet numbers have the
same numbers in the network portion and the same (all binary 0) value in the host portion
of the number. Each individual subnet number has a unique value in the subnet portion of
the number.
The binary algorithm is shown in the table that follows. Refer to the section "Given a
Network Number and a Static Subnet Mask, What Are the Valid Subnet Numbers?" in
Chapter 5 for a review of the algorithm.
apA.fm Page 734 Monday, March 20, 2000 5:24 PM