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Which configuration should you use?

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.
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 clientcomputers in the branch office site only if Server2 is offline.
Server2 must provide IPv4 addresses to the clientcomputers in the main office site only if Server1 is offline.
Which configuration should you use?

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A.
Load sharing mode failover partners

B.
Hot standby mode failover partners

C.
A Network Load Balancing (NLB) cluster

D.
A failover cluster

Explanation:
http://blogs.technet.com/b/teamdhcp/archive/2012/06/28/ensuring-high-availability-of-dhcp-using-windows-server-2012-dhcp-failover.aspx
Ensuring High Availability of DHCP using Windows Server 2012 DHCP Failover
The Hot Standby mode results in an Active-Passive configuration. You will be required to designate oneof the
two DHCP servers as the active server and the otheras standby.
The standby server is dormant with regard to serving client requests as long as the active server is up.
However, the standby server receives all the inbound lease updates from the active DHCP server and
keeps its database up to date.
=================
http://blogs.technet.com/b/teamdhcp/archive/2012/09/03/dhcp-failover-hot-standby-mode.aspx
DHCP Failover Hot-Standby Mode
In the previous blog on DHCP Failover, we discussedthe DHCP failover load balance mode where both DHCP
servers respond to client requests and load balancethe requests between them based on an admin specified
load distribution ratio.
In the other mode of a failover relationship, knownas the Hot-Standby mode (Active-Passive), only oneof the
servers actively leases IP addresses and option configuration to clients in given subnet(s)/scope(s) while the
other server (standby) is passive. The standby server services the clients, only in event of active server being
down. The clients fallback to the active server once the active server becomes available again post the outage.
The Load balance mode is more suited for single site deployment where the 2 DHCP servers in a failover
relationship are co-located with the subnets/scopesbeing served by them. As the servers are in network
proximity with the clients, the clients do not experience any latency while acquiring or renewing an IP address.
Hot-Standby mode is more suited for multi-site deployment topologies. Each site would have a local
DHCP server which is configured to provide the DHCPservice to the clients on the local network and DHCP
server at a remote site would be standby server. Ina normal state of operation, computers and deviceson a
given site receive IP addresses and other network configuration from the DHCP server located at the same site
as the clients.However, in the event of the local DHCP server being down, the DHCP server from the
remote site would provide the service to the clients.
You could choose to deploy hot standby mode in a single-site deployment also if you need to.

One Comment on “Which configuration should you use?”

  1. B-Art says:

    For a testing lab:
    http://technet.microsoft.com/nl-nl/library/hh831385.aspx

    Hot standby mode

    In hot standby mode, two servers operate in a fail-over relationship where an active server is responsible for leasing IP addresses and configuration information to all clients in a scope or sub-net. The secondary server assumes this responsibility if the primary server becomes unavailable. (!)A server is primary or secondary in the context of a sub-net.(!) For instance, a server that has the role of a primary for a given sub-net could be a secondary server for another sub-net.

    Hot standby mode of operation is best suited to deployments where a central office or data center server acts as a standby backup server to a server at a remote site, which is local to the DHCP clients

    “…The storage location of the DHCP databases must not be a single point of failure…” rules out a cluster. (Most cluster configurations use shared storage) From an OS standpoint this is a single server. (You have to buy a separate kind of fail over storage system, NOT mentioned in the question!)

    Then there is answer A or B.
    The question states 2 sites. That rules out “load sharing” which is recommended ONLY within 1 Site. So The answer must be B.




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