You are an Enterprise administrator for contoso.com. Which of the following options would you choose to configure a fault-tolerant DHCP infrastructure in your company where two DHCP servers exist? You need to ensure that all client computers are able to obtain a valid IP address if a single DHCP server fails. The corporate network of the company contains 1,000 DHCP client computers that are located on a single subnet
The DHCP servers are named as contosoDHCP1 and contosoDHCP2. A router having single IP address on the internal interface is also configured on the corporate network to separate the internal network from the Internet.
The contosoDHCP1 is configured with following scope information.
Starting IP address: 172.16.0.1
Ending IP address: 172.16.7.255
Subnet mask: 255.255.240.0
How should you configure contosoDHCP2?
A.
Create a scope for the subnet 172.16.0.0/20. Configure the scope to use a starting IP address of 172.16.8.1 and an ending IP address of 172.16.15.254.
B.
Create a scope for the subnet 172.16.8.0/21. Configure the scope to use a starting IP address of 172.16.8.1 and an ending IP address of 172.16.10.254.
C.
Create a scope for the subnet 172.16.0.0/21. Configure the scope to use a starting IP address of 172.16.0.1 and an ending IP address of 172.16.15.254.
D.
Create a scope for the subnet 172.17.0.0/16. Configure the scope to use a starting IP address of 172.17.0.1 and an ending IP address of 172.17.255.254.
E.
None of the above
Explanation:
The subnet mask 255.255.240.0 means a /20 subnet. For load balancing you need to ensure that the DHCP2 should be configured on the same network therefore, you need to select answer A where the subnet is 172.16.0.0/20.
The /20 network can contain IP address range from 172.16.0.1 to 172.16.15.255, which means 4000 total hosts can be configured. DHCP1 already contains the IP address range from 172.16.0.1 to 172.16.7.255 to serve 1000 hosts.
In case of the failure of DHCP1, another IP address range is required for the 1000 computers that the network has. Therefore DHCP2 can contain the range of 172.16.8.1 to 172.16.15.254