Hosting Multiple Web Sites on a Single Server
IIS supports multiple Web sites on a single server. For example, rather than using three different servers to host three different Web sites, you can install all three Web sites on the same server. Consolidating Web sites saves hardware resources, conserves space, and reduces energy costs. To ensure that user requests reach the correct Web site, you must configure a unique identity for each site on the server. To do so, you must distinguish each Web site with at least one of three unique identifiers: a host header name, an IP address, or a unique TCP port number.
Create Alias Name in DNS for any Host (A) Record
Alias name in DNS server allows administrators to assign a user friendly name for any host based on the domain name. Alias names are mostly used for web servers where real host names are complicated enough to be distributed to external users. With the help of alias names administrators can specify a unique user-friendly name which can be mapped with the DNS server and can be distributed among both internal and external users to make them access the website easily and remember the name as well. Creation of alias names in DNS server is a simple process provided a corresponding Host (A) record is available for which the alias name is being created.
Round Robin Testing
Round Robin DNS is a server load balancing configuration in which a group of identically configured servers IP addresses are assigned to a single Internet host name or FQDN (Fully Qualified Domain Name) and DNS provides a different server IP address from the group each time a request to resolve the host name is received. After implementation, DNS Round Robin must be tested to confirm that every DNS request receives a different server IP address. Use the "ping" utility in Windows to test and verify Round Robin DNS configuration.