Search Engine Optimization Technology tutorial of the full version of the first chapter

The first part: the domain name and the host to the SEO influence
Domain name and host is the foundation of the website, the commercial website chooses the domain name and the host especially should pay attention to the image and the quality, for the Network marketing development lays a solid foundation. At the same time, the choice of good domain name and host is also the first step of search engine optimization.
　

domain name selection and SEO
Domain Name and IP:
Each site's domain name corresponds to an IP address, which is a digital ID assigned to each computer or network device on the network. Domain name must be resolved by the Domain name server (DNS), converted to digital IP, in order to enable computer understanding identification, such as: 219.136.248.149

Most of the SME sites are stored in a server divided by a number of virtual hosts, from multiple Web sites to share a server and IP address, some Web servers have hundreds of domain names share an IP address. This is less costly for webmasters, but it poses the following potential risks to the site's search engine rankings:
1, sharing the host of other sites if the search engine punishment, will more or less spread to your site. In this respect, AltaVista has the following advice: "If there is a site cheating under the same IP, then our search engine will be punished for all sites under the IP"; Fortunately, most search engines are not so arbitrary, such as Google, generally do not carry out such a joint punishment.
　

2, if the search engine for some spammer server has been punished, its IP is considered to be Spam, then all the sites under the IP will be implicated, so that the rankings of these sites declined or in search engines were cleared.
　

Tools Recommended:
Check domain IP:HTTP://WWW.123CHA.COM/IP
IP counter-check: http://www.whois.sc/members/reverse-ip.html (see which domains are shared under an IP address)
Name. Free registration)

Level two domain name (secondary domain name):
Level two domain name form such as: yourname.site.com, not www.yourname.com. Having your own independent domain name is the basis for search engine friendliness on the site. At present, there are many sites to provide free space, such as blogs (blog) free space, corporate free space, free self-service construction station, E-commerce platform, etc., usually for users to assign a level two domain name, or the page is stored in a Web site under a certain path. This is extremely unfavorable to search engine value your website, two domain name in addition to user access inconvenient, but also mainly has the following drawbacks: