# Overlapping VLSM Subnets – Speed Test 1

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
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Arista
October 10, 2014 10:34 am

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

lyjo
October 10, 2014 11:17 am

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
October 10, 2014 12:58 pm

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

Bojan Landekic
October 10, 2014 2:07 pm

3 \$ 6

October 13, 2014 9:05 am

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

Kelvin Flores Sucre
October 28, 2014 11:01 pm

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