Subnet Excercises

Subnet Excercises Note: You need to thoroughly understand the structure of Class A’s, B’s, and C’s network address in order to handle the following questions. Good lucks. I do not have answer keys to these questions. You are welcome to ask me to check your answers. 1. Given the subnet mask, 255.255.255.0, and an IP address 66.68.100.1, a. How many bits are used for subnet ID? Why? b. How many IP addresses are lost due to the subnetting? ______________________________________________________________________ 2. In dealing with a network configuration problem. An IT manager found that the following information on a station: IP address was 225.101.10.97 and the subnet mask was 255.255.255.224. What might be the problem? ______________________________________________________________________ 3. In dealing with a network configuration problem. An IT manager found that the following information on a station: IP address was 199.101.10.32 and the subnet mask was 255.255.255.192. Assume the network ID is correct. What might be the problem? ______________________________________________________________________ 4. For a particular Class C subnet, if the subnet ID is 0100, answer the following questions: a. Define the subnet mask. b. Does 212.34.23.129 belong to this subnet? c. How many subnets can the organization have? d. How many IP addresses are available in each segment? e. How many IP addresses are lost due to subnetting (in terms of the whole organizations)? 5. For a particular Class B subnet, if the subnet ID is 001000: a. How many bits are used for subnet ID? b. Define the subnet mask. c. Does 144.33.48.254 belong to this subnet? d. How many subnets can the organization have? e. How many IP addresses are available in each segment? f. How many IP addresses are lost due to subnetting (in terms of the whole organizations)? 7. Divide the IP network address, 195.25.2.0, so that it is capable of supporting at least 9 network segments. ______________________________________________________________________ 8. Divide the IP network address, 140.25.0.0, so that it is capable of supporting 254 network segments.

______________________________________________________________________ 9. Divide the IP network address, 140.25.0.0, so that it is capable of supporting 128 network segments. ______________________________________________________________________ 10. Divide IP network address, 25.25.0.0, so that it is capable of supporting 65,354 network segments. ______________________________________________________________________ 11. Create subnets for IP network address, 222.22.22.0, so that one segment can support at least 56 attachments and 5 segments at least 12 attachments each. You also need to define the subnet mask for each segment. ______________________________________________________________________ 12. Create subnets for IP network address, 200.10.10.0, so that one segment can support at least 48 attachments and 3 segments at least 30 attachments each. You also need to define the subnet mask for each segment. ______________________________________________________________________

Q&A 1. Which criteria identifies a Class B address? a decimal number in first octet from 1 to 127 a decimal number in first octet from 127 to 191 a decimal number in first octet from 128 to 192 a decimal number in first octet from 128 to 191 a decimal number in first octet from 192 to 223 2. How many usable hosts are available given a Class C IP address with the default subnet mask? 254 255 256 510 511 512 3. Which subnet mask would be assigned to the network address of 192.168.32.0 to provide 254 useable host addresses per subnetwork? 255.255.0.0 255.255.255.0 255.255.254.0 255.255.248.0

4. What is the network broadcast address for a Class C address of 192.168.32.0 with the default subnet mask? 192.168.0.0 192.168.0.255 192.168.32.0 192.168.32.254 192.168.32.255 5. The network 128.128.32.0 has 1022 useable hosts. What is the subnet mask for this network? 255.255.250.0 255.255.251.0 255.255.252.0 255.255.254.0 255.255.255.0 6. Given a host with the IP address 172.32.65.13 and a default subnet mask, to which network does the host belong? 172.32.65.0 172.32.65.32 172.32.0.0 172.32.32.0 7. A small company has a class C network license and needs to create five usable subnets, each subnet capable of accommodating at least 20 hosts. Which of the following is the appropriate subnet mask? 255.255.255.0 255.255.255.192 255.255.255.224 255.255.255.240 8. How many bits are available for Class B host IP addresses using the default subnet mask? 1 4

8 14 16 24 9. How many usable subnets are created by applying the subnet mask 255.255.255.0 to a Class B network? 256 255 254 512 511 510 10. How many usable class C subnetworks are created with a subnet mask of 255.255.255.224? 1 2 3 4 5 6 11. Company XYZ uses a network address of 192.168.4.0. It uses the mask of 255.255.255.224 to create subnets. What is the maximum number of usable hosts in each subnet? 6 14 30 62 12. Which are the network and broadcast addresses when given an IP host address of 198.101.6.55/28? (Choose two.) 198.101.6.0 198.101.6.32

198.101.6.48 198.101.6.57 198.101.6.63 198.101.6.255