Explanation/Reference:
Explanation:
You must provide a host service (SRV) resource record in DNS for Outlook clients to discover the Autodiscover service by using DNS.
We should provide two SRV records, one for the internal DNS zone and one for the public DNS zone.
Incorrect Answers:
A: Service Connection Points (SCPs) are objects in Active Directory that hold information about services, but SCP would not be useful for setting up Outlook Anywhere. Instead we need to configure the DNS.
C, D: TCP port 389 is the LDAP protocol, but Outlook Anywhere does not use this port so there is no need for a port rule for it.
The Windows RPC over HTTP Proxy component, which Outlook Anywhere clients use to connect, wraps remote procedure calls (RPCs) with an HTTP layer. This allows traffic to traverse network firewalls without requiring RPC ports to be opened.
References:
https://technet.microsoft.com/en-gb/library/bb124251(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/bb332063(EXCHG.80).aspx