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4 1. Fill in the following table: Host IP Addr. Class Network Host Network Broadcast Default Subnet Mask Given an IP address of a. What is the binary equivalent of the second octet? b. What is the Class of the address? c. What is the network address of this IP address? d. Is this a valid IP host address (Y/N)? e. Why or why not? 3. Which is the maximum number of hosts you can have with a class C network address? 4. How many class B networks are there? _ 5. How many hosts can each class B network have? 6. How many octets are there in an IP address? How many bits per octet?

5 Step 4 Determine which IP host addresses are valid for commercial networks. Task: For the following IP host addresses determine which are valid for commercial networks. Why or why not?. Explanation: Valid means it could be assigned to a workstation, server, printer, router interface etc. 1. Fill in the following table. IP Valid? (Yes/No) Why or why not?

15 10. How many hosts per subnet can be defined with this subnet mask? _ 11. What is the maximum number of hosts that can be defined for all subnets with this scenario (assuming you cannot use the lowest and highest subnet numbers and cannot use the lowest and highest host ID on each subnet)? 12. Is a valid host IP address with this scenario? 13. Why or why not? 14. Is a valid host IP address with this scenario? 15. Why or why not? 16. Host "A" has an IP address of Host "B" has an IP address of Are these hosts on the same subnet? Why?

16 LAB SUBNET MASK 1 ANSWERS Step 5 1. Fill in the table below and answer the following questions: Subnet No. Subnet bits borrowed Binary value Subnet bits Decimal & Subnet No. Host bits possible Subnet / Host binary values (range) Decimal range (6 bits) Use? Subnet # ( ) NO Subnet # ( YES Subnet # YES ( ) Subnet # YES ( ) Subnet # YES ( ) Subnet # YES ( ) Subnet # YES ( ) Subnet # ( ) NO

21 Fill in the blanks in the following diagram with the correct Network and IP addresses.

24 6. What is the result of the ANDing process for host X? Decimal Host X IP addr: Binary Host X IP addr: Binary Subnet Mask: Binary ANDing Result: Decimal ANDing Result: What is the result of the ANDing process for host Z? Decimal Host Z IP addr: Binary Host Z IP addr: Binary Subnet Mask: Binary ANDing Result: Decimal ANDing Result: The Decimal ANDing result from questions 6 is the network/subnet that Host X is on. The result from question 7 is the network/subnet that Host Z is on. Are Host X and Host Z on the same network/subnet? NO 9. What will host X now do with the packet? Since the destination host Z is not on the Host X Local Area Network, Host X will send the packet to the "Default Gateway" which is the IP address of Interface A on the router 10. Fill in the blanks in the following diagram with the correct Network and IP addresses.

28 6. What is the result of the ANDing process for Host X? Decimal Host X IP addr:... Binary Host X IP addr:... Binary Subnet Mask:... Binary ANDing Result:... Decimal ANDing Result: What is the result of the ANDing process for Host Z? Decimal Host Z IP addr:... Binary Host Z IP addr:... Binary Subnet Mask:... Binary ANDing Result:... Decimal ANDing Result: The Decimal ANDing result from questions 6 is the network/subnet that Host X is on. The result from question 7 is the network/subnet that Host Z is on. Are Host X and Host Z on the same network/subnet? 9. What will Host X now do with the packet?

29 10. Fill in the blanks in the following diagram with the correct Network and IP addresses.

32 10. When the router receives the packet from Host X and compares its interface A IP address and the destination address for host Z with the subnet mask, which router interface will it send the packet out of to get the packet to Host Z? Interface C

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