qr code in c# windows application Server A s primary scope is configured to use the IP address range 192.168.10.1 to in Visual C#

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Server A s primary scope is configured to use the IP address range 192.168.10.1 to
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192.168.10.254 and has an exclusion range of 192.168.10.125 to 192.168.10.254.
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Server B s primary scope is configured to use the IP address range 192.168.10.1 to
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192.168.10.254 and has an exclusion range of 192.168.10.1 to 192.168.10.124. Here, 254 IP addresses are available, which could be used to service 200 or more clients. When a client starts up on the network, both DHCP servers respond. The client accepts the first IP address offered, which could be on either Server A or Server B and which is often the server that is closest to the client. Because both servers are configured to use the same IP address range, both servers can service clients on that subnet. If one of the servers fails, a client using an IP address in the excluded range of the remaining server would be allowed to obtain a new lease. Why The DHCP server is on the same subnet and its scope is configured for IP addresses in this range. It sees the exclusion and knows that IP addresses in this range cannot be assigned, but it can assign the client an IP address from the nonexcluded range. Thus, you achieve basic fault tolerance and availability.
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Managing DHCP Although this approach is designed to provide some redundancy and fault tolerance, it is possible that one of the servers would assign more IP addresses than the other. This could lead to a situation in which one of the servers doesn t have any available IP addresses, and if it is the other server that fails, no IP addresses would be available to clients seeking new leases and they would be configured to use APIPA.
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80/20 Failover
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By configuring the 80/20 failover approach, you use two DHCP servers to make a disproportionate amount of IP addresses available to clients for leasing. Here, you have a primary DHCP server that is configured with 80 percent of the available IP addresses and a backup DHCP server that is configured with 20 percent of the available IP addresses. This situation is ideal when the DHCP servers are separated from each other, such as when the primary DHCP server is on the primary subnet and the backup DHCP server is on a smaller remote subnet. To see how this would be implemented, consider the following example. The organization has two DHCP servers, as follows:
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Server A s primary scope is configured to use the IP address range 192.168.10.1 to
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192.168.10.254 and has an exclusion range of 192.168.10.203 to 192.168.10.254.
Server B s primary scope is configured to use the IP address range 192.168.10.1 to
192.168.10.254 and has an exclusion range of 192.168.10.1 to 192.168.10.202. Here, 254 IP addresses are again available, which could be used to service 200 or more clients the bulk of which are located on the primary subnet. You are using the remote DHCP server on a smaller subnet as a backup. If the primary server were to go down, the backup could respond to client requests and handle their leases. When the primary came back online, it would handle the majority of client leases because it is located on the primary subnet closer to the bulk of the client computers. Again, you achieve basic fault tolerance and availability. Although this approach is designed to provide some redundancy and fault tolerance, it is possible that the primary would be offline too long and the backup DHCP server would run out of available IP addresses. If this were to happen, no IP addresses would be available to clients seeking new leases, and they would be configured to use APIPA.
100/100 Failover
By configuring the 100/100 failover approach, you make twice as many IP addresses available as are needed. Thus, if you must provide DHCP services for 200 clients, you make at least 400 IP addresses available to those clients. As with 50/50 failover, each DHCP server is configured with an identical scope range but with different exclusions within that range. The first server gets the first half of the scope s IP address range and excludes the second half. The second server gets the second half of the scope s IP address range and excludes the first half.
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