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Network Configuration

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Network Configuration

mail.longxin
I was asked this question in class and I'm not sure if I gave the right answer or not.

Company with 55 (max) different locations.
Each location has a static IP address.
Each location has max 13 PCs in the internal network.

Locations need to be able to connect via VPN thus have the same Sub Net:
I?m thinking (IP) Class B/ (SN) 255.255.255.128 ? giving me 126 IPs/SN to work with just in case all locations connect to one location at the same time.
Q1: is this SN a good choice?

For the internal network at each location:

Internet

Router
? Public IP (Static)
? Private IP 172.16.0.1 / SN 255.255.255.128

Firewall with 2 NIC
? Router facing NIC ? IP 172.16.0.2/ SN 255.255.255.128/ GW 172.16.0.1
? LAN facing NIC ? IP 172.16.0.10/ SN 255.255.255.128/ GW 172.16.0.2


Hub/Switch
Data Server IP 172.16.10.1/ SN 255.255.255.128/ GW 172.16.0.2
File Server IP 172.16.10.2/ SN 255.255.255.128/ GW 172.16.0.2

Switch / Switches
PC1
PC2
PC3
Etc
IP adds 172.16.20.x/ SN 255.255.255.128/ GW 172.16.0.2


Q2: Is this the right configuration? If not what should I change?
Q3: Recommended OS for Firewall, Server 1 and Server 2.

Appreciate you taking the time to help me out.