CIS223 - Skagit Valley College



CIS221Subnetting Review Questions:Please read the document subnetDD.doc before doing these exercises. Complete the questions below using only the handout. If you have questions, let me know. Example:Given the following IP and subnet mask in slash format, what is the subnet mask in dotted decimal format, how many subnets are there, and how many hosts are there per subnet?IP: 112.23.55.225/23Answer: Mask=255.255.254.0 #Subnets=32766 #Hosts per subnet=510Solution: This is a class A address because it falls between the numbers of 1-126The default subnet mask for a class A address is 255.0.0.0 or /8 which is the number of bits used for the network ID.Write out a /23 bit subnet mask in binary and separate the /8 class A network bits from the mask 11111111.11111111.11111110.00000000 What you have left above is 15 subnet bits and 9 host bits.Use the formula 2n-2 to solve the number of subnets and hosts per subnet#Subnets= 215-2=32766#Host per subnet=29-2=510Convert the binary mask to dotted decimal format using the conversion chart: 255.255.254.0Review questions:What is the dotted decimal format for the following subnet mask: /12What is the slash format for the following subnet mask: 255.255.255.224Given the following IP and subnet mask in slash format, what is the subnet mask in dotted decimal format, how many subnets are there, and how many hosts are there per subnet?IP: 134.39.47.225/20Given the following IP and subnet mask in dotted decimal format, what is the subnet mask in slash format, how many subnets are there, and how many hosts are there per subnet?IP: 195.23.55.225Subnet mask: 255.255.255.192Given the following IP and subnet mask in slash format, what is the subnet mask in dotted decimal format, how many subnets are there, and how many hosts are there per subnet?IP: 115.68.126.65/13Given the following IP and subnet mask in dotted decimal format, what is the subnet mask in slash format, how many subnets are there, and how many hosts are there per subnet?IP: 186.78.33.168Subnet mask: 255.255.255.128 ................
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