Your network contains an Active Directory domain named contoso.com.
The domain contains a main office and a branch office.
An Active Directory site exists for each office.
The domain contains two servers named Server1 and Server2 that run Windows Server 2012 R2.
Both servers have the DHCP Server server role installed.
Server1 is located in the main office site. Server2 is located in the branch office site.
Server1 provides IPv4 addresses to the client computers in the main office site.
Server2 provides IPv4 addresses to the client computers in the branch office site.
You need to ensure that if either Server1 or Server2 are offline, the client computers can still
obtain IPv4 addresses.
The solution must meet the following requirements:
– The storage location of the DHCP databases must not be a single point
of failure.
– Server1 must provide IPv4 addresses to the client computers in the
branch office site only if Server2 is offline.
– Server2 must provide IPv4 addresses to the client computers in the
main office site only if Server1 is offline.
Which configuration should you use?
A.
load sharing mode failover partners
B.
a failover cluster
C.
hot standby mode failover partners
D.
a Network Load Balancing (NLB) cluster
Explanation:
http://blogs.technet.com/b/teamdhcp/archive/2012/09/03/dhcp-failover-hot-standby-mode.aspx
http://blogs.technet.com/b/teamdhcp/archive/2012/09/03/dhcp-failover-hot-standby-mode.aspx
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this can’t be correct?
since the question states that both server should give ip-addresses?
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It is correct. Both servers have the DHCP server server role installed. You need to configure DHCP Failover on each server for each scope. When configuring DHCP Failover you’d have to choose Hot stand by mode, which is the mode that best suits the requirements.
The explanation is pretty clear about hot stand by mode:
“Operation in Hot Standby mode
Unlike the Load Balance mode, where the 2 DHCP servers compute a hash of the MAC address of the clients and decide whether to respond to the client or not, in hot standby mode, the servers do not compute hash of the MAC address of clients. The active server responds to all client requests and the standby server does not respond to any client requests at all while operating in NORMAL state. When active server goes down, the standby server transitions into Communication Interrupted state and starts responding to the clients. Once the active server is up, the standby server retreats into standby mode and stops responding to clients. This facilitates failback of the clients back to the active server.”
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C is correct.
“Hot Standby mode is best suited when the disaster recovery site is located at a different location. Because the failover is defined for a scope, you can have one server act as the primary for one scope or subnet, and be the secondary for another.”
i.e. One scope for Server 1 Main office and one scope for Server 2 Branch office and then, they “hot standby” each other.
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