Analyzing IP Networks – Answers, Exercise 1

certskills
By certskills June 11, 2012 07:00

Today’s post lists the answers to the previous post’s question, with a few comments, with a place to discuss. Nothing snazzy, but it does hit the fundamentals. Enjoy!

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Class, Network ID, and Network Broadcast

The Network ID can be derived from the class A, B, or C DDN value by copying the network octets, and writing a 0 for the rest of the octets. Similarly, the network broadcast address can be found by using the same logic, but writing a 255 instead of 0 for the host octets. Table 2 shows the class for each of the five problems, along with the derived network ID and network broadcast address for each class A, B, or C address.

Table 2: Network IDs and Network Broadcast Addresses

DDN Value Class Network ID Network Broadcast Address
1 100.100.100.100 A 100.0.0.0 100.255.255.255
2 200.200.200.200 C 200.200.200.0 200.200.200.255
3 300.300.300.300 None N/A N/A
4 128.128.128.128 B 128.128.0.0 128.128.255.255
5 191.191.191.191 B 191.191.0.0 191.191.255.255

Usable Host IP Addresses

To find the range of IP addresses that can be used by hosts in the (unsubnetted) classful network, just add 1 to the network ID and subtract 1 from the network broadcast address. Table 3 shows the results for these five problems.

Table 3: Ranges of Usable Addresses

Network ID Lowest Usable Host Address Highest Usable Host Address Network Broadcast Address
1 100.0.0.0 100.0.0.1 100.255.255.254 100.255.255.255
2 200.200.200.0 200.200.200.1 200.200.200.254 200.200.200.255
3 N/A N/A N/A N/A
4 128.128.0.0 128.128.0.1 128.128.255.254 128.128.255.255
5 191.191.0.0 191.191.0.1 191.191.255.254 191.191.255.255
Analyzing IP Networks Exercise 1
Analyzing IP Networks Exercise 2
certskills
By certskills June 11, 2012 07:00
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1 Comment

  1. Len October 17, 18:03

    good first exercise!

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