Overlapping VLSM Subnets – Speed Test 1

certskills
By certskills October 10, 2014 09:05

It’s subnetting Friday – #CCENT edition. Your job? Look at a set of 5 or 6 subnet/mask combos, and identify which ones overlap, and which ones do not. There may be no overlaps, or there may be a lot.

Not sure what I mean? Look at the following post first, which puts it in perspective, and then come back here.

The Problem Statement

Identify which subnets overlap with each other. That is, if the subnets listed as #1 and #2 in the list overlap, list “1&2” as your answer.

  1. 10.25.64.0/20
  2. 10.25.99.96/30
  3. 10.25.48.0/21
  4. 10.25.88.128/25
  5. 10.25.96.0/22
  6. 10.25.46.0/23
Overlapping Subnets – the Problem
Overlapping VLSM Subnets - Speed Test 1 Answers
certskills
By certskills October 10, 2014 09:05
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7 Comments

  1. Arista October 10, 10:34

    1. 10.25.64.0/20: 10.25.64.0 – 10.25.79.255

    2. 10.25.99.96/30: 10.25.99.96 – 10.25.99.99

    3. 10.25.48.0/21: 10.25.48.0 – 10.25.55.255

    4. 10.25.88.128/25: 10.25.88.128 – 10.25.88.255

    5. 10.25.96.0/22: 10.25.96.0 – 10.25.99.255

    6. 10.25.46.0/23: 10.25.46.0 – 10.25.47.255

    Answer: 2 & 5 overlap

    Reply to this comment
    • CCENTSkills October 10, 11:17

      Howdy! Thanks for playing. I’ll post the answers post in a few days, with explanation. I’ll withhold a confirm/reject of your answer til then, to avoid spoiling for any others while they’re still working. Thanks!

      Reply to this comment
  2. Imran Fazal October 10, 12:58

    10.25.64.0/20———-00001010.00011001.01000000.00000000/20
    11111111.11111111.11110000.00000000

    10.25.64.0
    10.25.79.255

    10.25.99.94/30———00001010.00011001.01100011.01011110/30
    11111111.11111111.11111111.11111100

    10.25.99.92
    10.25.99.95

    10.25.48.0/21———-00001010.00011001.00110000.00000000/21
    11111111.11111111.11111000.00000000

    10.25.48.0
    10.25.55.255

    10.25.88.1/25———-00001010.00011001.01011000.00000001/25
    11111111.11111111.11111111.10000000

    10.25.88.0
    10.25.88.127

    10.25.96.0/22———-00001010.00011001.01100000.00000000/22
    11111111.11111111.11111100.00000000

    10.25.96.0
    10.25.99.255

    10.25.46.0/23———-00001010.00011001.00101110.00000000/23
    11111111.11111111.11111110.00000000
    10.25.46.0
    10.25.47.255

    answer:10.25.99.96/30 and 10.25.96.0/22 overlaps

    Reply to this comment
  3. Bojan Landekic October 10, 14:07

    3 $ 6

    Reply to this comment
  4. Kelvin Flores Sucre October 28, 23:01

    A) 10.25.64.0/20 x
    10.25.0100-0000.00000000 10.25.64.0/20
    10.25.0100-1111.11111111 10.25.79.255/20

    B) 10.25.99.96/30 <————————–
    10.25.01100011.011000-00 10.25.99.96/30
    10.25.01100011.011000-11 10.25.99.99/30

    C) 10.25.48.0/21 x
    10.25.00110-000.00000000 10.25.48.0/21
    10.25.00110-111.11111111 10.25.55.255/21

    D) 10.25.88.128/25 x
    10.25.01011000.1-0000000 10.25.88.128/25
    10.25.01011000.1-1111111 10.25.88.255/25

    E) 10.25.96.0/22 <————————–
    10.25.011000-00.00000000 10.25.96.0/22
    10.25.011000-11.11111111 10.25.99.255/22

    F) 10.25.46.0/23 x
    10.25.0010111-0.00000000 10.25.46.0/23
    10.25.0010111-1.11111111 10.25.47.255/23

    Reply to this comment
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