Convert Masks, Drill 1: Answers

CCENTSkills
By CCENTSkills 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
Convert Masks, Drill 1
Analyzing Classful Networks and My Dear Aunt Sally
CCENTSkills
By CCENTSkills 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.

    Reply to this comment
    • Wendell Odom of Certskills Author May 29, 06:51

      Hi Bill,
      Problem 4 has the answer in the text above the table. It’s an illegal value, so there’s no correct value to list in the table. Sorry it was difficult to find…
      Wendell

      Reply to this comment
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