Chapter 12 IP Addressing and Subnetting

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Chapter 12 IP Addressing and Subnetting

• Exam Preparation Tools for Subnetting
• IP Addressing and Routing
• Math Operations Used When Subnetting
• Analyzing and Choosing Subnet Masks
• Analyzing Existing Subnets
• Design Choosing the Subnets of a Classful
  Network

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Do I know this?
Go through the Quiz- 5 minutes
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• 1. Which of the following are private IP
  networks?
• a. 172.31.0.0
• b. 172.32.0.0
• c. 192.168.255.0
• d. 192.1.168.0
• e. 11.0.0.0

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• 1. Which of the following are private IP
  networks?
• a. 172.31.0.0
• b. 172.32.0.0
• c. 192.168.255.0
• d. 192.1.168.0
• e. 11.0.0.0
• Answer A C

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• 2. Which of the following is the result of a
  Boolean AND between IP address 150.150.4.100 and
  mask 255.255.192.0?
• a. 1001 0110 1001 0110 0000 0100 0110 0100
• b. 1001 0110 1001 0110 0000 0000 0000 0000
• c. 1001 0110 1001 0110 0000 0100 0000 0000
• d. 1001 0110 0000 0000 0000 0000 0000 0000

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• 2. Which of the following is the result of a
  Boolean AND between IP address 150.150.4.100 and
  mask 255.255.192.0?
• a. 1001 0110 1001 0110 0000 0100 0110 0100
• b. 1001 0110 1001 0110 0000 0000 0000 0000
• c. 1001 0110 1001 0110 0000 0100 0000 0000
• d. 1001 0110 0000 0000 0000 0000 0000 0000
• Answer B

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• 3. Which of the following shows the equivalent of
  subnet mask 255.255.248.0, but in prefix
  notation?
• a. /248
• b. /24
• c. /28
• d. /21
• e. /20
• f. /23

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• 3. Which of the following shows the equivalent of
  subnet mask 255.255.248.0, but in prefix
  notation?
• a. /248
• b. /24
• c. /28
• d. /21
• e. /20
• f. /23
• Answer D

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• 4. If mask 255.255.255.128 were used with a Class
  B network, how many subnets couldexist, with how
  many hosts per subnet, respectively?
• a. 256 and 256
• b. 254 and 254
• c. 62 and 1022
• d. 1022 and 62
• e. 512 and 126
• f. 126 and 510

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• 4. If mask 255.255.255.128 were used with a Class
  B network, how many subnets couldexist, with how
  many hosts per subnet, respectively?
• a. 256 and 256
• b. 254 and 254
• c. 62 and 1022
• d. 1022 and 62
• e. 512 and 126
• f. 126 and 510
• Answer E

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• 5. A Class B network needs to be subnetted such
  that it supports 100 subnets and 100
  hosts/subnet. For this design, if multiple masks
  meet those design requirements, the engineer
  should choose the mask that maximizes the number
  of hosts per subnet. Which of the following masks
  meets the design criteria?
• a. 255.255.255.0
• b. /23
• c. /26
• d. 255.255.252.0

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• 5. A Class B network needs to be subnetted such
  that it supports 100 subnets and 100
  hosts/subnet. For this design, if multiple masks
  meet those design requirements, the engineer
  should choose the mask that maximizes the number
  of hosts per subnet. Which of the following masks
  meets the design criteria?
• a. 255.255.255.0
• b. /23
• c. /26
• d. 255.255.252.0
• Answer B

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• 6. If mask 255.255.255.240 were used with a Class
  C network, how many subnets could exist, with how
  many hosts per subnet, respectively?
• a. 16 and 16
• b. 14 and 14
• c. 16 and 14
• d. 8 and 32
• e. 32 and 8
• f. 6 and 30

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• 6. If mask 255.255.255.240 were used with a Class
  C network, how many subnets could exist, with how
  many hosts per subnet, respectively?
• a. 16 and 16
• b. 14 and 14
• c. 16 and 14
• d. 8 and 32
• e. 32 and 8
• f. 6 and 30
• Answer C

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• 7. Which of the following subnet masks lets a
  Class B network have up to 150 hosts per subnet,
  and supports 164 subnets?
• a. 255.0.0.0
• b. 255.255.0.0
• c. 255.255.255.0
• d. 255.255.192.0
• e. 255.255.240.0
• f. 255.255.252.0

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• 7. Which of the following subnet masks lets a
  Class B network have up to 150 hosts per subnet,
  and supports 164 subnets?
• a. 255.0.0.0
• b. 255.255.0.0
• c. 255.255.255.0
• d. 255.255.192.0
• e. 255.255.240.0
• f. 255.255.252.0
• Answer C

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• 8. Which of the following subnet masks let a
  Class A network have up to 150 hosts persubnet
  and supports 164 subnets?
• a. 255.0.0.0
• b. 255.255.0.0
• c. 255.255.255.0
• d. 255.255.192.0
• e. 255.255.252.0
• f. 255.255.255.192

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• 8. Which of the following subnet masks let a
  Class A network have up to 150 hosts persubnet
  and supports 164 subnets?
• a. 255.0.0.0
• b. 255.255.0.0
• c. 255.255.255.0
• d. 255.255.192.0
• e. 255.255.252.0
• f. 255.255.255.192
• Answer B, C, D, E

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• 9. Which of the following IP addresses are not in
  the same subnet as 190.4.80.80, mask
  255.255.255.0?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1

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• 9. Which of the following IP addresses are not in
  the same subnet as 190.4.80.80, mask
  255.255.255.0?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1
• Answer E F

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• 10. Which of the following IP addresses is not in
  the same subnet as 190.4.80.80, mask
  255.255.240.0?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1

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• 10. Which of the following IP addresses is not in
  the same subnet as 190.4.80.80, mask
  255.255.240.0?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1
• Answer F

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• 11. Which of the following IP addresses are not
  in the same subnet as 190.4.80.80/25?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1

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• 11. Which of the following IP addresses are not
  in the same subnet as 190.4.80.80/25?
• a. 190.4.80.1
• b. 190.4.80.50
• c. 190.4.80.100
• d. 190.4.80.200
• e. 190.4.90.1
• f. 10.1.1.1
• Answer D, E F

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• 12. Each of the following answers lists a dotted
  decimal number and a subnet mask. The dotted
  decimal number might be a valid IP address that
  can be used by a host or it might be a subnet
  number or broadcast address. Which of the answers
  show an address that can be used by a host?
• a. 10.0.0.0, 255.0.0.0
• b. 192.168.5.160, 255.255.255.192
• c. 172.27.27.27, 255.255.255.252
• d. 172.20.49.0, 255.255.254.0

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• 12. Each of the following answers lists a dotted
  decimal number and a subnet mask. The dotted
  decimal number might be a valid IP address that
  can be used by a host or it might be a subnet
  number or broadcast address. Which of the answers
  show an address that can be used by a host?
• a. 10.0.0.0, 255.0.0.0
• b. 192.168.5.160, 255.255.255.192
• c. 172.27.27.27, 255.255.255.252
• d. 172.20.49.0, 255.255.254.0
• Answer B D

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• 13. Which of the following are valid subnet
  numbers in network 180.1.0.0 when using mask
  255.255.248.0?
• a. 180.1.2.0
• b. 180.1.4.0
• c. 180.1.8.0
• d. 180.1.16.0
• e. 180.1.32.0
• f. 180.1.40.0

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• 13. Which of the following are valid subnet
  numbers in network 180.1.0.0 when using mask
  255.255.248.0?
• a. 180.1.2.0
• b. 180.1.4.0
• c. 180.1.8.0
• d. 180.1.16.0
• e. 180.1.32.0
• f. 180.1.40.0
• Answer C, D, E F

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• 14. Which of the following are not valid subnet
  numbers in network 180.1.0.0 when using mask
  255.255.255.0?
• a. 180.2.2.0
• b. 180.1.4.0
• c. 180.1.8.0
• d. 180.1.16.0
• e. 180.1.32.0
• f. 180.1.40.0

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• 14. Which of the following are not valid subnet
  numbers in network 180.1.0.0 when using mask
  255.255.255.0?
• a. 180.2.2.0
• b. 180.1.4.0
• c. 180.1.8.0
• d. 180.1.16.0
• e. 180.1.32.0
• f. 180.1.40.0
• Answer A

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Any Questions?
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Subenetting Prep

• Load ROM and get familiar with test engine. Look
  at appendices
• Read chapter through IP Addressing and Routing
• Read each section and do exercises
• If you need practice, ask for more examples
• Visit CCNA Prep center-http//www.cisco.com/go/pre
  pcenter

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Use Subnet Calculator

• If you want to check your work, use a subnet
  calculator

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IP Addressing and Routing

• IPv 4 is mostly in use
• Need to know
• Address Class Ranges
• Default Subnet Masks
• Reserved Addresses
• General idea of number of hosts and networks

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IP Address details
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Default Subnet Masks
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Private Addresses

• Cannot be used on Public Internet
• NAT or Proxy server must hide address
• Can be used within a company/home

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IP v 6 overview
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IP Subnetting Review

• Lets us break larger networks into smaller ones
• Save addresses
• Network Subnet defines grouping
• We steal bits from the host portion

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IP Routing Review

• Routers list destination networks
• Network address and subnet mask
• Routers list next best hop
• How to get to that network if not connected

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Math and Subnetting

• Converting IP addresses and masks from binary to
  decimal, and decimal to binary
• Performing a binary math operation called a
  Boolean AND
• Converting between two formats for subnet masks
  dotted decimal and prefix notation

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Decimal To Binary

• Take Decimal Number and use binary values

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Any Questions?