Visual%20VLSM - PowerPoint PPT Presentation
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Visual%20VLSM
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... to get unless you know someone in the White House or your daddy owns WorldCom ... Your boss wants a monster network up and running now, and doesn't want to spend ... – PowerPoint PPT presentation
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Title: Visual%20VLSM
1
Visual VLSM
- Subnetting SubnetsorMaking your network scream!
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You Know Its Good
- Class C addresses are all thats left
- Class A and B addresses are hard to get unless
you know someone in the White House or your daddy
owns WorldCom - ISPs have the rest of the C addresses
- Your boss wants a monster network up and running
now, and doesnt want to spend any more money to
do it
3
Your Mission
- Add all those departments to the new network
- Separate most of the workers based on their job
descriptions - Add all the security you can without spending any
money
4
Your Company Structure
5
Each Department is to be separate from the rest
- Each Department has to be on its own subnet
- Each Subnet will be in different parts of the
building - You have only one IP address to work with
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Not to worry!You have a couple of options
- First, you have to decide the number of subnets
you need for each Department or subgroup - Second, you will then need to add the number of
subnets needed to connect routers - Third, you look at the chart we saw earlier to
show you at a glance just how many bits you will
borrow to make this happen - Remember to forget classful routing
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Start with 7 subnets which covers the number of
departments that need to be on their own network
8
- You have 50 hosts in your typesetting department
and you have 5 routers connecting each of your
departments, buildings and floors. - Looking at the chart for subnetting, you decide
that your IP address will be broken down into a
maximum of 8 departments, and of those 8, one
needs to be on a subnet with at least 50 hosts.
This requires you do the following - First, pick the number of borrowed bits that will
give you 48 hosts That will be a CIDR of /26
(you have 4 subnets of 64 hosts each). - This decides your biggest subnet. Now move on to
the next biggest subnet, and work your way down
until you get to the wire subnets. - Ok, your other departments have (respectively)
30, 18, 5, and 6 hosts minimum. Look at your
chart, pick the next CIDR of /27 for the 30
hosts, /27 for 18 hosts, and /29 for both the 5
and 6 host subnets. Use the /30 for your wire
subnets, connecting from router to router, and
you are set. - Start with the address range 10.1.1.0/26 which
gives your first department 10.1.1.0 10.1.1.63,
then go to 10.1.1.64/27 which will give your next
department 10.1.1.64 10.1.1.95, and again
10.1.1.96/27 for 10.1.1.96 10.1.1.128 and so
forth. Using the chart, you can view a block of
addresses, then move down to the next level that
supplies you with the right amount of hosts.
Start from the largest and work your way down to
the smallest to make it really easy!
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