host header in iis7

i have following doubts while creating new sites in iis7

1. what should be value of host header in site binding. should it match with 开发者_运维技巧domain name ?
2. should website name and host header be same?

If your websites are www.example.com and blogs.example.com, your host headers should be www.example.com and blogs.example.com.

If you want any traffic to a name that resolves to an IP address on your server to go to a specific site, then don't put a host header on that site. (E.g. have a host header for blogs.example.com but not for www.example.com.)