A summary for IP subnetting, Summaries of Computer Networks

an easy way for IP subnetting , I took it from a YouTube video

Typology: Summaries

2019/2020

Uploaded on 08/23/2021

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Subnet Method Summary
Rahaf Nsour.
This summary is taken from this YouTube video YouTube Video
1. Take the number of the subnets from the question.
2. Take the whole column of the subnet number. (If the number of the subnets are not in
the table we take the larger / for example if we asked for 3 subnets we take 4)
3. Find netowrks IP (Subnet IP):
1) The first network IP is always the original network IP.
2) To find the second IP adress, add the host number to the first IP adress.
3) To find the third IP adress, add the host number to the second IP adress.
4) Continue in the same method to find the rest of IP adresses.
4. Find the subnet mask take it from the table.
5. Find the number of usable hosts (number of hosts):
1) From the table, we take the host number (which is the total number of a host IDs
for each network).
2) Number of usable hosts = Host number (from the table) 2
o Minus 2 because: The first host IP for the network IP, The last network IP for the
broadcast IP.
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Subnet Method Summary

Rahaf Nsour. This summary is taken from this YouTube video YouTube Video

  1. Take the number of the subnets from the question.
  2. Take the whole column of the subnet number. (If the number of the subnets are not in the table we take the larger / for example if we asked for 3 subnets we take 4)
  3. Find netowrks IP (Subnet IP):
    1. The first network IP is always the original network IP.
    2. To find the second IP adress, add the host number to the first IP adress.
    3. To find the third IP adress, add the host number to the second IP adress.
    4. Continue in the same method to find the rest of IP adresses.
  4. Find the subnet mask  take it from the table.
  5. Find the number of usable hosts (number of hosts):
    1. From the table, we take the host number (which is the total number of a host IDs for each network).
    2. Number of usable hosts = Host number (from the table) – 2 o Minus 2 because: The first host IP for the network IP, The last network IP for the broadcast IP.

o The usable hosts number is the same for all the networks.

  1. Find the broadcast IP: The broadcast for the firs network IP is the second network IP minus one. Broadcast IP = The next netowrk IP - 1
  2. The first and last valid IP: o First valid IP = Network IP + 1 o Last Valid IP = Broadcast IP - 1 Example One day your supervisor walks to you, saying: “here is the network ID 192.168.4.0/24, please create three separate networks or subnets for a coffee shop: Sunny Cafe.” The three separate subnets/networks are: One is for the office, one for the front desk and storage room, and one is for public use. Your task is to list each subnet network ID, subnet mask, Host ID Range, # of usable host IDs, and Broadcast ID. One last question: How many subnets are wasted after subnetting? The original network ID 192.168.4.0/24 || Subnets  4 Network 1 Network 2 Network 3 Network 4 Number of hosts 62 62 62 62 Subnet IP 192.168.4.0 192.168.4.64 192.168.4.128 192.168.4. Broadcast IP 192.168.4.63 192.168.4.127 192.168.4.128 192.168.4. First valid IP 192.168.4.1 192.168.4.65 192.168.4.129 192.168.4. Last valid IP 192.168.4.62 192.168.4.126 192.168.4.127 192.168.4.