Your computer has an Active Directory Domain Services (AD DS) domain. All servers run Windows
Server 2008 R2. All portable computers run Windows 7. You virtualize applications by using
Microsoft Application Virtualization (App-V). You are deploying servers to five new branch offices.
Each branch office has its own subnet, and will stream virtual applications from a local IIS server.
Users frequently move between branch offices with their portable computers. You need to ensure
that branch office users access virtualized applications only from the local IIS server.
What should you do?
A.
Create a single DNS SRV record that contains all servers.
B.
Create a single DNS A record and configure a HTTP host header for each IIS server.
C.
Create five DNS A records with the same name. Point each A record to a different IIS server and
disable the round robin option.
D.
Create five DNS CNAME records with the same name. Point each CNAME record to a single IIS
server. Disable the netmask ordering option.
Explanation:
Configuring Subnet Prioritization
If the resolver receives multiple A resource records from a DNS server, and some have IP addresses
from networks to which the computer is directly connected to, the resolver orders those resource
records first. This reduces network traffic across subnets by forcing computers to connect to
network resources that are closer to them. Subnet prioritization prevents the resolver from using
the round robin feature, defined in RFC 1794. Using the round robin feature, the server rotates the
order of resource record data returned in a query answer in which multiple resource records of the
same type exist for a queried DNS domain name. You can also change the round robin setting from
the registry; however, do so from the DNS snapin instead. If Enable round robin is selected (the
default) and the value of LocalNetPriority is 1, the server rotates among the A resource records that
it returns in the order of their similarity to the IP address of the querying client. If Enable round robin
is deselected and the value of LocalNetPriority is 1, the server returns the records in local net priority
order. It does not rotate among available addresses.
http://technet.microsoft.com/en-us/library/cc961422.aspx
http://msmvps.com/blogs/acefekay/archive/2010/05/29/dns-and-subnet-priortization-ampdnsround- robin.aspx