Network model:
- In the system, we have 2 different subnet:

Subnet A : 192.168.1.x
Subnet B : 10.10.10.x
Subnet C : 172.10.10.x

- To see this the same subnet, you need to use 2 router, each router has 2 network card.
On router 1:
+ Card 1: 192.168.1.1, connected to Switch 1. Named LAN 1
+ Card 2: 10.10.10.1, connected to [...]

1. DHCP Relay Agent in the network subnet 2:
Model: The network includes:
+ A DHCP Server, has the IP 192.168.1.1, connected to Switch 1. Level is responsible for the IP subnet for 2 A and B. 2 management scope is 192.168.1.x and 10.10.10x
+ The client in a subnet are granted IP in 192.168.1.x
+ DHCP Relay [...]

- DHCP Relay Agent is the central switch DHCP Discover (or DHCP Request) to the DHCP Server. DHCP Relay Agent allows forward the query to the DHCP Client and DHCP server IP returned to Clients (as tasks such as Proxy)
- In case of DHCP Client and DHCP Server is not the same subnet and connected [...]

SA Server supports VPN connections from external clients on the Internet. Virtually any computer that is able to act as a PPTP or L2TP/IPSec client can connect to your network through the ISA Server. However, everything has to be set up right in order to make this work. Important issues that need to be addressed [...]

Your company has about 100 machines, you now have 1 CD win. Now you must setup the whole system of the company. If normal, you must set the turn on 100 machines. Each machine takes about 1 hour. So you take about 100 hours to complete system installed! If you do not want to use [...]

Today, I try configuration RIS server on windows 2003 - Enterprise  SP2, Using WMware to test, Its working well, so many trouble shooting need to fix.
See more detail:

Instead of deploying a DHCP server on every subnet, discover how to install and configure a DHCP relay agent. By far the hardest part of mastering the DHCP relay agent is installing it. Once you have found the relay agent, configuring it to listen for DHCPDiscover packets, is the proverbial piece of cake.
DHCP [...]