Convert Masks, Drill 1: Answers

certskills
By certskills May 21, 2012 07:00

Today’s post lists the answers from Convert Masks, Drill 1. If you have questions on any of the 6 problems, post away.  Some related posts:

Answers to Convert Masks, Drill 1:

Problem 4 lists a binary number that is illegal as a mask. All binary versions of subnet masks must have an unbroken string of binary 1’s, and then the rest binary 0’s. It cannot interleave 1’s and 0’s. The rest were legal.

All the original problems are shown in bold; the not bolded parts show the answers.

Table 2: Convert Masks, Drill 1, Answers

Binary Prefix DDN
1 11111111 11111111 11111100 00000000 /22 255.255.252.0
2 11111111 11111000 00000000 00000000 /13 255.248.0.0
3 11111111 11111111 11111111 11100000 /27 255.255.255.224
4 11111111 11111111 11111100 11110000
5 11111111 11111111 11111110 00000000 /23 255.255.254.0
6 11111111 11111100 00000000 00000000 /14 255.252.0.0
Answer, Config VM: Frame Relay IP
Analyzing Classful Networks and My Dear Aunt Sally
certskills
By certskills May 21, 2012 07:00
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2 Comments

  1. Bill Scully May 25, 12:16

    Hi, there’s no answer to #4 above, only a question.

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