7.1.4.9 Lab – Identifying IPv4 Addresses Answers

7.1.4.9 Lab – Identifying IPv4 Addresses Answers

Lab– Identifying IPv4 Addresses (Answers Version – Optional Lab)

Answers Note: Red font color or gray highlights indicate text that appears in the instructor copy only. Optional activities are designed to enhance understanding and/or to provide additional practice.

Objectives

Part 1: Identify IPv4 Addresses

Part 2: Classify IPv4 Addresses

Background / Scenario

In this lab, you will examine the structure of Internet Protocol version 4 (IPv4) addresses. You will identify the various types of IPv4 addresses and the components that help comprise the address, such as network portion, host portion, and subnet mask. Types of addresses covered include public, private, unicast, and multicast.

Answers Note: This optional activity can be done individually in class or assigned as homework. The lab can also be done in class with students working in pairs. If the lab is done in class, it should be followed up by discussion with correct answers. All public IP addresses used in this lab are owned by Cisco.

Required Resources

  • Device with Internet access
  • Optional: IPv4 address calculator

Part 1: Identify IPv4 Addresses

Step 1: In Part 1, you will be given several examples of IPv4 addresses and will complete tables with appropriate information.

Step 1: Analyze the table shown below and identify the network portion and host portion of the given IPv4 addresses.

The first two rows show examples of how the table should be completed.

Key for table:

N = all 8 bits for an octet are in the network portion of the address

n = a bit in the network portion of the address

H = all 8 bits for an octet are in the host portion of the address

h = a bit in the host portion of the address

IP Address/Prefix Network/Host

N,n = Network, H,h = Host

Subnet Mask Network Address
192.168.10.10/24 N.N.N.H 255.255.255.0 192.168.10.0
10.101.99.17/23 N.N.nnnnnnnh.H 255.255.254.0 10.101.98.0
209.165.200.227/27 N.N.N.nnnhhhhh 255.255.255.224 209.165.200.224
172.31.45.252/24 N.N.N.H 255.255.255.0 172.31.45.0
10.1.8.200/26 N.N.N.nnhhhhhh 255.255.255.192 10.1.8.192
172.16.117.77/20 N.N.nnnnhhhh.H 255.255.240.0 172.16.112.0
10.1.1.101/25 N.N.N.nhhhhhhh 255.255.255.128 10.1.1.0
209.165.202.140/27 N.N.N.nnnhhhhh 255.255.255.224 209.165.202.128
192.168.28.45/28 N.N.N.nnnnhhhh 255.255.255.240 192.168.28.32

Step 2: Analyze the table below and list the range of host and broadcast addresses given a network/prefix mask pair.

The first row shows an example of how the table should be completed.

IP Address/Prefix First Host Address Last Host Address Broadcast Address
192.168.10.10/24 192.168.10.1 192.168.10.254 192.168.10.255
10.101.99.17/23 10.101.98.1 10.101.99.254 10.101.99.255
209.165.200.227/27 209.165.200.225 209.165.200.254 209.165.200.255
172.31.45.252/24 172.31.45.1 172.31.45.254 172.31.45.255
10.1.8.200/26 10.1.8.193 10.1.8.254 10.1.8.255
172.16.117.77/20 172.16.112.1 172.16.127.254 172.16.127.255
10.1.1.101/25 10.1.1.1 10.1.1.126 10.1.1.127
209.165.202.140/27 209.165.202.129 209.165.202.158 209.165.202.159
192.168.28.45/28 192.168.28.33 192.168.28.46 192.168.28.47

Part 2: Classify IPv4 Addresses

In Part 2, you will identify and classify several examples of IPv4 addresses.

Step 1: Analyze the table shown below and identify the type of address (network, host, multicast, or broadcast address).

The first row shows an example of how the table should be completed.

IP Address Subnet Mask Address Type
10.1.1.1 255.255.255.252 host
192.168.33.63 255.255.255.192 broadcast
239.192.1.100 255.252.0.0 multicast
172.25.12.52 255.255.255.0 host
10.255.0.0 255.0.0.0 host
172.16.128.48 255.255.255.240 network
209.165.202.159 255.255.255.224 broadcast
172.16.0.255 255.255.0.0 host
224.10.1.11 255.255.255.0 multicast

Step 2: Analyze the table shown below and identify the address as public or private.

IP Address/Prefix Public or Private
209.165.201.30/27 Public
192.168.255.253/24 Private
10.100.11.103/16 Private
172.30.1.100/28 Private
192.31.7.11/24 Public
172.20.18.150/22 Private
128.107.10.1/16 Public
192.135.250.10/24 Public
64.104.0.11/16 Public

Step 3: Analyze the table shown below and identify whether the address/prefix pair is a valid host address.

IP Address/Prefix Valid Host Address? Reason
127.1.0.10/24 No Loopback
172.16.255.0/16 Yes Host address
241.19.10.100/24 No Reserved
192.168.0.254/24 Yes Host address
192.31.7.255/24 No Broadcast
64.102.255.255/14 Yes Host address
224.0.0.5/16 No Multicast
10.0.255.255/8 Yes Host address
198.133.219.8/24 Yes Host address

Reflection

Why should we continue to study and learn about IPv4 addressing if the available IPv4 address space is depleted?

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Many organizations will continue to use the private IPv4 address space for their internal networking needs. The public IPv4 addresses will be used for many years to come.

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