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Network Default Subnet Class Mask
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Off the Record Although you need to know how to perform these calculations for the exam, most sysadmins avoid doing so on the job. Administrators who need to determine subnet related information typically use what is called a subnet calculator or network calculator. Many of these utilities can be downloaded for free, and some even operate directly from Web pages. Typically, subnet calculators allow you to enter some addressing requirements, such as a network address and number of hosts per subnet, and then automatically calculate the rest of the addressing information for you. This information can include the appropriate subnet mask, the number of subnets, the binary form of the address, and the subnet broadcast address.
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Lesson 3
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Subnetting and Supernetting IP Networks
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2-39
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Exercise 3: Estimate Subnet Address Ranges
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In this exercise, you estimate subnet address ranges by determining the ranges of the first three subnets within a subnetted network. For each network address and subnet mask given in column A, subtract from 256 the value of the relevant octet in the subnet mask. List this value as the grouping value in column B. Then, beginning with 0, list the first four multiples of this same value in column C. Use these values to complete col umns D and E, as shown in the example given.
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(D) Beginning Address of First Three Subnet Ranges 10.0.0.0, 10.16.0.0, 10.32.0.0
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(A) Network Address and Subnet Mask 10.0.0.0 255.240.0.0 172.16.0.0 255.255.224.0 172.18.0.0 255.255.248.0 192.168.1.0 255.255.255.192
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(C) First Four (B) Multiples of B Grouping Value (Including 0) 256 240 = 16 0, 16, 32, 48 }
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(E) Ending Address of First Three Subnet Ranges 10.15.255.255, 10.31.255.255, 10.47.255.255
Exercise 4: Determine Whether Two Addresses Are on the Same Subnet
By using the AND function available in Calculator, you can determine whether two addresses in a subnetted network are located on the same logical subnet. Simply perform two AND operations between the relevant octet in the subnet mask of the network and the corresponding octet of each IP address in question. If the result of these operations is the same, the two addresses are on the same logical subnet. For example, if the subnet mask of the network is 255.255.255.240 and the IP addresses in question are 192.168.0.220 and 192.168.0.192, calculate 240 AND 220 and then write down your result (208). Then calculate 240 AND 190 and write down your result (176). Because the results are different, the two addresses are on separate logical subnets.
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2
Understanding TCP/IP
Using the method just described, complete the following table.
AND Result #1 AND Result #2 Same Subnet
Subnet Mask 255.255.255.192 255.255.255.224 255.255.252.0 255.255.240.0
Address #1 192.168.1.116 192.168.0.180 172.16.100.234 172.16.64.10
Address #2 192.168.1.124 192.168.0.192 172.16.98.234 172.16.72.200
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You are the network administrator for the Philadelphia branch office of a large company. The IT department at company headquarters in New York has assigned you the network address space 172.16.0.0/21 to accommodate the entire Philadel phia branch network. This network consists of 4 subnets with 40 hosts each, to which you have already assigned the network addresses 172.16.0.0/24, 172.16.1.0/ 24, 172.16.2.0/24, and 172.16.3.0/24. All routers within the organization support both CIDR and VLSMs. Using your current addressing scheme and without changing the subnet mask you have configured for your network, how many more subnets will you be able to accommodate in the Philadelphia branch office 2. You are the network administrator for a large company. Your company network has been assigned the network address 131.107.0.0/16. Which subnet mask should you configure for the network if you want to accommodate 25 subnets with up to 2000 hosts per subnet Give the answer in both CIDR (network prefix) and dotteddecimal notations. 3. Your ISP has assigned you 2 Class C network addresses, 131.107.10.0 and 131.107.11.0, to accommodate your network s 400 hosts. Which network address and subnet mask (expressed as a network prefix) can you assign to this address space so that your routers and hosts view these 2 networks as a single network a. 131.107.10.0/23 b. 131.107.11.0/24 c. 131.107.10.0/22 d. 131.107.11.0/22
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