# Module 10 Subnetting Class A, B and C addresses. Solutions to the Lab Exercises a, b, c and d

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1 Module 10 Subnetting Class A, B and C addresses Solutions to the Lab Exercises a, b, c and d

2 10.3.5a Basic Subnetting Use the following information and answer the following subnet related questions A company has applied for and received a Class C network address of The physical network is to be divided into 4 subnets, which will be interconnected by routers. At least 25 hosts will be needed per subnet. A Class C custom subnet mask needs to be used and a router is needed between the subnets to route packets from one subnet to another. Determine the number of bits that need to be borrowed from the host portion of the network address and the number of bits that will be left for host addresses. Note: There will be 8 possible subnets, of which 6 can be used. (By borrowing two bits, only 4 subnets can be created (2^2 = 4) of which only 2 can be used. So three bits have to be borrowed.) Default subnet mask: Subnet Mask in binary form: Bits borrowed: 3 New Subnet Mask in binary form: Decimal format: Number of usable subnets: (2^3) 2 = 6 Number of usable hosts: (2^5) 2 = 30 Fill in the following table and answer the following questions: Subnet No. Subnet Bits Borrowed Binary Value Subnet Bits Decimal and Subnet No. Host Bits Possible Binary Values (Range) (5 Bits) Subnet/Host Decimal Range Use? Subnet No Subnet Yes Subnet Yes Subnet Yes Subnet Yes Subnet Yes

3 Subnet Yes Subnet No There are 32 hosts in each of the 8 subnets. Subnet Ranges: Subnet Number Subnet Range 1 st subnet ~ nd subnet ~ rd subnet ~ th subnet ~ th subnet ~ th subnet ~ th subnet ~ th subnet ~ Which octet(s) represent the network portion of a Class C IP address? First three octets 2. Which octet(s) represent the host portion of a Class C IP address? Last Octet

5 14. Why or why not? Network address of 6 th subnet 15. Host A has an IP address of Host B has an IP address of Are these hosts on the same subnet? No. Host A ( ) belongs to 4 th subnet and Host B ( ) belongs to 5 th subnet.

6 10.3.5b Subnetting a Class A Network Given a Class A network address of / 24 answer the following questions The default subnet mask for Class A network is Binary Format: The new subnet mask has 24 1 s in it. New subnet mask in binary format: It can be observed that 16 bits have been borrowed into the network portion. Number of subnets created: 2^16 = Number of usable subnets: = Number of host bits: 8 Number of hosts in each subnet: 2^8 = 256 Number of usable hosts: = 254 Subnet Range for the first 6 subnets: Subnet Number Subnet Range 1 st subnet ~ nd subnet ~ rd subnet ~ th subnet ~ th subnet ~ th subnet ~

7 1. How many bits were borrowed from the host portion of this address? Sixteen 2. What is the subnet mask for this network? How many usable subnets are there? usable subnets 4. How many usable hosts are there? 254 usable hosts 5. What is the host range for usable subnet sixteen? From the subnet range table above, the host range for 4 th usable subnet (5 th subnet) is ~ Likewise, the host range for 16 th usable subnet will be ~ What is the network address for usable subnet sixteen? What is the broadcast address for usable subnet sixteen? What is the broadcast address for the last usable subnet? The host range for the last subnet is ~ The network address for this subnet is So the broadcast address of the previous subnet (last usable subnet) is

8 10.3.5c Subnetting a Class B Network ABC Manufacturing has acquired a Class B address, The company needs to create a subnetting scheme to provide the following: 36 subnets with at least 100 hosts 24 subnets with at least 255 hosts 10 subnets with at least 50 hosts It is not necessary to supply an address for the WAN connection since it is supplied by the Internet service provider. Regardless of the number of hosts in each subnet, the total number of subnets that need to be created is 70 ( ) Number of bits to be borrowed to create atleast 70 subnets is 7. Default subnet mask: Subnet mask for this network: How many subnets are needed for this network? What is the minimum number of bits that can be borrowed? Seven 3. What is the subnet mask for this network? Dotted decimal: Binary format: Slash format: /23 4. How many usable subnets are there? (2^7)-2 = How many usable hosts are there per subnet? (2^9) 2 = 510 The first subnet range is ~ But the first usable subnet starts from ~

9 Subnet ranges for the 1 st three and the last four usable subnets: Subnetwork ID (Network Address) Subnet# Host Range Broadcast ID (Broadcast Address) ~ ~ ~ ~ ~ ~ ~ What is the host range for subnet 2? ~ What is the broadcast address for 126 th subnet? What is the broadcast address for the major network?

10 10.3.5d Subnetting a Class C Network The Classical Academy has acquired a Class C address, The academy needs to create subnets to provide low level security and broadcast control on the LAN. It is not necessary to supply an address for the WAN connection. It is supplied by the Internet service provider. The LAN consists of the following, each of which will require its own subnet: Classroom #1 28 nodes Classroom #2 22 nodes Computer lab 30 nodes Instructors 12 nodes Administration 8 nodes From above, it is understood that 5 subnets need to be created. 1. What is the subnet mask for this network? The default subnet mask is By borrowing 3 bits into the network portion, the subnet mask for this network becomes Binary: Slash format: /27 2. How many usable hosts are there per subnet? (2^5) 2 = 30 hosts Subnet# Subnetwork ID Host Range Broadcast ID ~ ~ ~ ~ ~ ~

11 ~ ~ What is the host range for subnet six? ~ What is the broadcast address for 3 rd subnet? What is the broadcast address for the major network?

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