Dear Students These are some practice problems on subnetting and subnet masking They are not to be handed in No solutions will be provided however I will be glad to check your answers during my regular office hours or via e mail for DEN students ONLY In all of the questions assume for simplicity that the all 0 s and all 1 s can be used for the subnet ID but they can t be used for host ID 1 The IP address of a host on a class C network is 198 123 46 237 Four subnets are allowed on this network What are the subnet mask and the subnet address 2 What are the range of hosts on a subnet whose address is 150 20 193 4 3 Find the subnet address of a host whose IP address is 120 14 22 16 if the subnet mask is 255 255 128 0 What is the host ID 4 Find the subnet masks that create the following number of subnets two cases each in the defined class Also find the maximum of hosts on each subnet a 30 and 122 class A b 30 and 122 class B c 30 and 122 class C 5 An organization is granted a Class A address The organization wants to create the maximum subnets with at least 50 000 hosts on each subnet Find the best subnet mask in this case 6 An organization is granted a Class A address The organization wants to create at least 6 000 subnets with the maximum of hosts on each subnet Find the best subnet mask in this case 7 What is the maximum of subnets using the following masks The class is identified in parenthesis a 255 255 224 0 A b 255 255 224 0 B c 255 255 255 224 C Dear Students These are some practice problems on Classless IP addressing subnetting and subnet masking They are not to be handed in No solutions will be provided however I will be glad to check your answers during my regular office hours or via e mail for DEN students ONLY 1 In a block of addresses we know that the IP address of one host is 25 34 12 56 16 What is the first IP address in this block This address is the Network Address What is the last IP address in this block This is the limited broadcast address 2 An organization is granted the block 16 0 0 0 8 The administrator wants to create 500 fixed length subnets Find the Subnet Mask The number of addresses in each subnet the first and the last addresses in subnet 1 and the first and the last addresses in subnet 500 3 An ISP is granted a block of addresses starting with 190 100 0 0 16 The ISP wants to distribute these blocks to three groups of customers as follows The first group has 64 customers each needing 256 addresses The second group has 128 customers each needing 128 addresses The third group has 128 customers each needing 64 addresses Design the sub blocks The network address and the broadcast address of the first and last customer in each group and give the slash notation for each sub block Find how many IP addresses are still available after these allocations 4 An ISP is granted a block of addresses starting with 150 80 0 0 16 The ISP wants to distribute these blocks to 2600 customers as follows The first group has 200 medium size businesses each needing 128 addresses The second group has 400 small size businesses each needing 16 addresses The third group has 2000 residential customers each needing 4 addresses This one is a bit tricky Design the sub blocks The network address and the broadcast address of the first and last customer in each group and give the slash notation for each sub block Find how many IP addresses are still available after these allocations 5 A University has 150 LANs with 100 hosts on each LAN Suppose the University has one class B address Design an appropriate subnet addressing scheme i e choose an appropriate mask Repeat using an appropriate classless addressing 6 Perform Classless IP address aggregation aggregation means building up the block size on the following 24 addresses 128 56 24 0 24 128 56 25 0 24 128 56 26 0 24 and 128 56 27 0 24 Hint convert into binary and inspect the bits