IP Address in Networking | Problems

IP Address in Networking-

 

Before you go through this article, make sure that you have gone through the previous article on IP Address.

 

We have discussed-

  • IP Address is a unique address assigned to each computing device in an IP network.
  • ISP assigns IP Address to all the devices present on its network.
  • Casting refers to transmitting data (stream of packets) over the network.

 

Also Read- Types of Casting

 

In this article, we will discuss some practice problems based on IP Address.

 

Important Points-

 

Point-01:

 

For any given IP Address,

  • If the range of first octet is [1, 126], then IP Address belongs to class A.
  • If the range of first octet is [128, 191], then IP Address belongs to class B.
  • If the range of first octet is [192, 223], then IP Address belongs to class C.
  • If the range of first octet is [224, 239], then IP Address belongs to class D.
  • If the range of first octet is [240, 254], then IP Address belongs to class E.

 

Point-02:

 

For any given IP Address,

  • IP Address of its network is obtained by setting all its Host ID part bits to 0.

 

Point-03:

 

For any given IP Address,

  • Direct Broadcast Address is obtained by setting all its Host ID part bits to 1.

 

Point-04:

 

  • For any given IP Address, limited Broadcast Address is obtained by setting all its bits to 1.
  • For any network, its limited broadcast address is always 255.255.255.255

 

Point-05:

 

  • Class D IP Addresses are not divided into Net ID and Host ID parts.
  • Class E IP Addresses are not divided into Net ID and Host ID parts.

 

PRACTICE PROBLEMS BASED ON IP ADDRESS IN NETWORKING-

 

Problem-01:

 

For the following IP Addresses-

  1. 1.2.3.4
  2. 10.15.20.60
  3. 130.1.2.3
  4. 150.0.150.150
  5. 200.1.10.100
  6. 220.15.1.10
  7. 250.0.1.2
  8. 300.1.2.3

 

Identify the Class, Network IP Address, Direct broadcast address and Limited broadcast address of each IP Address.

 

Solution-

 

Part-A:

 

Given IP Address is-

1.2.3.4

 

  • IP Address belongs to class A
  • Network IP Address = 1.0.0.0
  • Direct Broadcast Address = 1.255.255.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-B:

 

Given IP Address is-

10.15.20.60

 

  • IP Address belongs to class A
  • Network IP Address = 10.0.0.0
  • Direct Broadcast Address = 10.255.255.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-C:

 

Given IP Address is-

130.1.2.3

 

  • IP Address belongs to class B
  • Network IP Address = 130.1.0.0
  • Direct Broadcast Address = 130.1.255.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-D:

 

Given IP Address is-

150.0.150.150

 

  • IP Address belongs to class B
  • Network IP Address = 150.0.0.0
  • Direct Broadcast Address = 150.0.255.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-E:

 

Given IP Address is-

200.1.10.100

 

  • IP Address belongs to class C
  • Network IP Address = 200.1.10.0
  • Direct Broadcast Address = 200.1.10.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-F:

 

Given IP Address is-

220.15.1.10

 

  • IP Address belongs to class C
  • Network IP Address = 220.15.1.0
  • Direct Broadcast Address = 220.15.1.255
  • Limited Broadcast Address = 255.255.255.255

 

Part-G:

 

Given IP Address is-

250.0.1.2

 

  • IP Address belongs to class E
  • Network IP Address = Not available
  • Direct Broadcast Address = Not available
  • Limited Broadcast Address = Not available

 

Part-H:

 

Given IP Address is-

300.1.2.3

 

  • This is not a valid IP Address.
  • This is because for any given IP Address, the range of its first octet is always [1, 254].
  • First and Last IP Addresses are reserved.

 

Problem-02:

 

A device has two or more IP Addresses, the device is called-

  1. Workstation
  2. Router
  3. Gateway
  4. All of these

 

Solution-

 

  • All the given devices have a network layer.
  • So, they will have at least one IP Address.

 

In TCP/IP suite-

  • Workstation and gateway have all the 5 layers.
  • Router has only 3 layers last layer being network layer.

 

Workstation-

 

  • A user may configure more than one IP Addresses in his workstation / computer.
  • With more than one IP Address, it remains present in more than one networks.
  • So, if one network goes down, it is always reachable from other networks.

 

The following figure shows a host present in more than one networks-

 

 

  • It is important to note that IP Addresses are assigned to interfaces.
  • When we buy a new laptop, we usually get 2-3 interfaces.
  • Thus, a workstation can have more than one IP Addresses.

 

Router-

 

  • A router may be connected to various interfaces.
  • Each interface has a unique IP Address.
  • Thus, a router may also have more than IP Addresses.
  • Similar is the case with gateways because gateways are extension of routers.

 

Thus, Option (D) is correct.

 

Problem-03:

 

A host with IP Address 200.100.1.1 wants to send a packet to all the hosts in the same network.

What will be-

  1. Source IP Address
  2. Destination IP Address

 

Solution-

 

  1. Source IP Address = IP Address of the sender = 200.100.1.1
  2. Destination IP Address = Limited Broadcast Address = 255.255.255.255

 

Problem-04:

 

A host with IP Address 10.100.100.100 wants to use loop back testing.

What will be-

  1. Source IP Address
  2. Destination IP Address

 

Solution-

 

  • Source IP Address = 10.100.100.100
  • Destination IP Address = Loopback Testing Address = 127.0.0.1

 

Problem-05:

 

How many bits are allocated for Network ID and Host ID in 23.192.157.234 address?

 

Solution-

 

Given IP Address belongs to class A.

Thus,

  • Number of bits reserved for Network ID = 8
  • Number of bits reserved for Host ID = 24

 

Problem-06:

 

Which devices can use logical addressing system?

  1. Hub
  2. Switch
  3. Bridge
  4. Router

 

Solution-

 

  • Devices which have network layer as the last layer can only use logical addressing system.
  • Devices which have data link layer as the last layer can only use physical addressing system.
  • IP Addresses are the logical addresses and MAC Addresses are the physical addresses.

 

Option-A:

 

  • Hub can neither use physical addressing system nor logical addressing system.
  • This is because it has physical layer as the last layer.

 

Option-B:

 

  • Switch can use physical addressing system but not logical addressing system.
  • This is because it has data link layer as the last layer.

 

Option-C:

 

  • Bridge can use physical addressing system but not logical addressing system.
  • This is because it has data link layer as the last layer.

 

Option-D:

 

  • Router can use physical addressing system as well as logical addressing system.
  • This is because it has network layer as the last layer.

 

Thus, option (D) is correct.

 

Problem-07:

 

What is the network ID of the IP Address 230.100.123.70?

 

Solution-

 

  • Given IP Address belongs to class D.
  • Class D IP Addresses are not divided into the Network ID and Host ID parts.
  • Thus, there is no network ID for the given IP Address.

 

Problem-08:

 

Match the following-

 

Column-I:

 

  1. 200.10.192.100
  2. 7.10.230.1
  3. 128.1.1.254
  4. 255.255.255.255
  5. 100.255.255.255

 

Column-II:

 

  1. Class A
  2. Limited Broadcast Address
  3. Direct Broadcast Address
  4. Class C
  5. Class B

 

Solution-

 

(I, D), (II, A), (III, E), (IV, B), (V, C)

 

Problem-09:

 

Suppose that instead of using 16 bits for network part of a class B Address, 20 bits have been used. How many class B networks would have been possible?

 

Solution-

 

  • Total 20 bits are used for Network ID of class B.
  • The first two bits are always set to 10.
  • Then, with 18 bits, number of networks possible = 218

 

Problem-10:

 

What is the default mask for 192.0.46.10?

 

Solution-

 

  • Given IP Address belongs to class C.
  • For class C, default mask = 255.255.255.0

 

Next Article- Classless Addressing

 

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Summary
IP Address in Networking | Problems
Article Name
IP Address in Networking | Problems
Description
Practice Problems based on IP Address in Networking. IP Address in Networking is a unique address for each device in a IP network. Classes of IP Address- A, B, C, D, E. IP Address Format- It is a 32 bit binary address written as 4 numbers separated by dots.
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Gate Vidyalay
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