Appendix D. Practice for Chapter 14: Analyzing Classful IPv4 Networks

Practice Problems

The practice problems in this appendix require that you determine a few basic facts about a network, given an IP address and an assumption that subnetting is not used in that network. To do so, refer to the processes described in Chapter 14 of CCENT/CCNA ICND1 100-105 Official Cert Guide.

Note

You may also elect to do this same set of practice problems using the Analyzing Classful IPv4 Networks application on the companion website.

In particular, for the upcoming list of IP addresses, you should identify the following information:

Image Class of the address

Image Number of octets in the network part of the address

Image Number of octets in the host part of the address

Image Network number

Image Network broadcast address

Find all these facts for the following IP addresses:

1. 10.55.44.3

2. 128.77.6.7

3. 192.168.76.54

4. 190.190.190.190

5. 9.1.1.1

6. 200.1.1.1

7. 201.1.77.5

8. 101.1.77.5

9. 119.67.99.240

10. 219.240.66.98

Answers

The process to answer these problems is relatively basic, so this section reviews the overall process and then lists the answers to problems 1–10.

The process starts by examining the first octet of the IP address:

Image If the first octet of the IP address is a number between 1 and 126, inclusive, the address is a Class A address.

Image If the first octet of the IP address is a number between 128 and 191, inclusive, the address is a Class B address.

Image If the first octet of the IP address is a number between 192 and 223, inclusive, the address is a Class C address.

When no subnetting is used:

Image Class A addresses have one octet in the network part of the address and three octets in the host part.

Image Class B addresses have two octets each in the network and host part.

Image Class C addresses have three octets in the network part and one octet in the host part.

After determining the class and the number of network octets, you can easily find the network number and network broadcast address. To find the network number, copy the network octets of the IP address and write down 0s for the host octets. To find the network broadcast address, copy the network octets of the IP address and write down 255s for the host octets.

Table D-1 lists all ten problems and their respective answers.

Image

Table D-1 Answers to Problems

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