What are Records Types of Exchange Server 2013?

There are 3 type DNS of records that Exchange Server 2013 needs:

SRV Resource Records: Are DNS records that identify servers that provide specific services on the network.
For example, an SRV resource record can contain information to help clients locate a domain controller in a specific domain or site.
All SRV resource records use a standard format, which consists of several fields that contain information that AD DS uses to map a service back to the computer that provides the service. The SRV records for domain controllers and global catalog servers are registered with different variations to allow locating domain controllers and global catalog servers in several different ways.

Host Records: Provide host name to IP address mapping. Host records are required for each domain
controller and other hosts that need to be accessible to Exchange Servers or client computers. Host
records can use Internet Protocol version 4 (IPv4), which are A records; or Internet Protocol version 6
(IPv6) records, which are AAAA records.

MX (Mail Exchanger) Records:  Allows servers to locate other servers to deliver Internet email by using the Simple Mail Transfer Protocol (SMTP). An MX record identifies the SMTP server
that will accept inbound messages for a specific DNS domain. Each MX record contains a host name and a preference value. When you deploy multiple SMTP servers that are accessible from the Internet, you can assign equal preference values to each MX record to enable load balancing between the SMTP servers.
We also can specify a lower preference value for one of the MX records. All messages are routed through the SMTP server that has the lower preference value MX record, unless that server is not available.