Overlapping VLSM Subnets – Speed Test 1

 In 200-301 V1 Appendices, CCENT-OLD, IPv4 VLSM

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
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Arista

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

lyjo

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!

Imran Fazal

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

Bojan Landekic

3 $ 6

[…] answer for Overlapping VLSM Subnets Speed Test 1 are below the […]

Kelvin Flores Sucre

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

Kelvin Flores Sucre

answer B – E.

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