Lab - Calculate IPv4 Subnets



Lab - Calculate IPv4 Subnets (Instructor Version)Instructor Note: Red font color or gray highlights indicate text that appears in the instructor copy only.ObjectivesPart 1: Determine IPv4 Address SubnettingPart 2: Calculate IPv4 Address SubnettingBackground / ScenarioThe ability to work with IPv4 subnets and determine network and host information based on a given IP address and subnet mask is critical to understanding how IPv4 networks operate. The first part is designed to reinforce how to compute network IP address information from a given IP address and subnet mask. When given an IP address and subnet mask, you will be able to determine other information about the subnet.Instructor Note: This activity can be done in class or assigned as homework. If the assignment is done in class, you may wish to have students work alone or in teams of 2 students each. It is suggested that the first problem is done together in class to give students guidance as to how to proceed for the rest of the assignment.The public IP addresses used in this lab are owned by Cisco.Required Resources1 PC (Windows with Internet access)Optional: IPv4 address calculatorInstructionsFill out the tables below with appropriate answers given the IPv4 address, original subnet mask, and new subnet mask.Given:Host IP Address:192.168.200.139Original Subnet Mask255.255.255.0New Subnet Mask:255.255.255.224Find:Number of Subnet Bits3Number of Subnets Created8Number of Host Bits per Subnet5Number of Hosts per Subnet30Network Address of this Subnet192.168.200.128IPv4 Address of First Host on this Subnet192.168.200.129IPv4 Address of Last Host on this Subnet192.168.200.158IPv4 Broadcast Address on this Subnet192.168.200.159Given:Host IP Address:10.101.99.228Original Subnet Mask255.0.0.0New Subnet Mask:255.255.128.0Find:Number of Subnet Bits9Number of Subnets Created512Number of Host Bits per Subnet15Number of Hosts per Subnet32,766Network Address of this Subnet10.101.0.0IPv4 Address of First Host on this Subnet10.101.0.1IPv4 Address of Last Host on this Subnet10.101.127.254IPv4 Broadcast Address on this Subnet10.101.127.255Given:Host IP Address:172.22.32.12Original Subnet Mask255.255.0.0New Subnet Mask:255.255.224.0Find:Number of Subnet Bits3Number of Subnets Created8Number of Host Bits per Subnet13Number of Hosts per Subnet8,190Network Address of this Subnet172.22.32.0IPv4 Address of First Host on this Subnet172.22.32.1IPv4 Address of Last Host on this Subnet172.22.63.254IPv4 Broadcast Address on this Subnet172.22.63.255Given:Host IP Address:192.168.1.245Original Subnet Mask255.255.255.0New Subnet Mask:255.255.255.252Find:Number of Subnet Bits6Number of Subnets Created64Number of Host Bits per Subnet2Number of Hosts per Subnet2Network Address of this Subnet192.168.1.244IPv4 Address of First Host on this Subnet192.168.1.245IPv4 Address of Last Host on this Subnet192.168.1.246IPv4 Broadcast Address on this Subnet192.168.1.247Given:Host IP Address:128.107.0.55Original Subnet Mask255.255.0.0New Subnet Mask:255.255.255.0Find:Number of Subnet Bits8Number of Subnets Created256Number of Host Bits per Subnet8Number of Hosts per Subnet254Network Address of this Subnet128.107.0.0IPv4 Address of First Host on this Subnet128.107.0.1IPv4 Address of Last Host on this Subnet128.107.0.254IPv4 Broadcast Address on this Subnet128.107.0.255Given:Host IP Address:192.135.250.180Original Subnet Mask255.255.255.0New Subnet Mask:255.255.255.248Find:Number of Subnet Bits5Number of Subnets Created32Number of Host Bits per Subnet3Number of Hosts per Subnet6Network Address of this Subnet192.135.250.176IPv4 Address of First Host on this Subnet192.135.250.177IPv4 Address of Last Host on this Subnet192.135.250.182IPv4 Broadcast Address on this Subnet192.135.250.183Reflection QuestionWhy is the subnet mask so important when analyzing an IPv4 address?Type your answers here.The subnet mask determines everything about the address: the network, number of host bits, number of hosts and the broadcast address. Merely looking at an IPv4 address tells you nothing. You need the subnet mask to fill in all the important pieces of information.End of DocumentEnd of document ................
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