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Network Design
17 years 9 months ago #18602
by Smurf
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx
Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
Replied by Smurf on topic Re: Network Design
Fantastic Question since i am only just reading about this for my Cisco Switching exam 
A little strange that you have been sent the questions for the job, normally you get them when you go for the Interview.
Anyhow, this is how i would go about it;
I am presuming that the floors are evenly distributed and therefore around 333 on each floor.
I would use seperate subnets on each floor using a 23bit subnet to give 510 hosts per floor. Somthing like
[code:1]Subnet A - 172.16.0.0/23
Subnet B - 172.16.2.0/23
Subnet C - 172.16.4.0/23[/code:1]
N.B. This is if we were segmenting based on floors, sometimes you can segment on job roles/functions or departments and if they span all floors then you would have to go down the VLAN route and setup subnets depending on how many subnets are required for the job functions or departments.
Right, i would then create a seprate subnet then for the server farm. Something like a Class C subnet 192.168.0.0/24 ?
The stack of switches (usually only layer 2 switches required for the floors to plug in the clients) on each floor would connect to a Core Layer 3 switch (to do the routing, no router then required) which then routed between the different floors and depending on the port density on the core switch and how many servers, etc.. you required in the server farm this would do and setup a new server subnet for that traffic.
You could if you wanted, have a further switch for the servers farm, just doing layer 2 and connect back to the core layer 3 switch and you could have a proper edge router/switch to connect the WAN to the Core switch (i forget all the different terms for all the different layers but i am sure i will have to remember them all for mi exam )
Well, so far in my reading (upto chapter 2) thats what i would do.....
A little strange that you have been sent the questions for the job, normally you get them when you go for the Interview.Anyhow, this is how i would go about it;
I am presuming that the floors are evenly distributed and therefore around 333 on each floor.
I would use seperate subnets on each floor using a 23bit subnet to give 510 hosts per floor. Somthing like
[code:1]Subnet A - 172.16.0.0/23
Subnet B - 172.16.2.0/23
Subnet C - 172.16.4.0/23[/code:1]
N.B. This is if we were segmenting based on floors, sometimes you can segment on job roles/functions or departments and if they span all floors then you would have to go down the VLAN route and setup subnets depending on how many subnets are required for the job functions or departments.
Right, i would then create a seprate subnet then for the server farm. Something like a Class C subnet 192.168.0.0/24 ?
The stack of switches (usually only layer 2 switches required for the floors to plug in the clients) on each floor would connect to a Core Layer 3 switch (to do the routing, no router then required) which then routed between the different floors and depending on the port density on the core switch and how many servers, etc.. you required in the server farm this would do and setup a new server subnet for that traffic.
You could if you wanted, have a further switch for the servers farm, just doing layer 2 and connect back to the core layer 3 switch and you could have a proper edge router/switch to connect the WAN to the Core switch (i forget all the different terms for all the different layers but i am sure i will have to remember them all for mi exam
)Well, so far in my reading (upto chapter 2) thats what i would do.....
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx
Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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