Web Protocols

• The World Wide Web(linked documents) is built on top of the Internet(interconnected devices).

• third-level-domain(or subdomain).second-level-domain.top-level-domain

• Domains → IP address

在 dns 之前，有这么几步: website local cache → ISP(Internet Service Providers) cache

dns lookup hierarchy: Root name servers → TLD name servers → Host name servers

• DNS spoofing attack: 也就是劫持了 DNS 查询可能会发生的伪造返回，The DNSSEC protocol extends the original DNS protocol and specifies the best way for DNS resolvers to authenticate the information sent to them.