[6421：Windows Server 2008網路基礎架構組態與疑難排除] Module2-Lesson2 : Configuring the DNS Role

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2-10。What Are the Components of a DNS Solution?

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2-11。DNS Resource Records
DNS resuirce records include：
SOA：Start of Authority(1Zone一定只有1筆) A：Host Record(為IPV4的IP命名) CNAME：Alias Record(已被命名後,可取別名) MX：Mail Exchange Record(若有架Mail Server則要記錄) SRV：Service Resource(註冊位置識別AD) NS：Name Servers(1~N筆作為備援用) AAAA：IPv6 DNS Record(為IPV6的IP命名)

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2-12。What Are Root Hints
Root Hints contain the IP address for DNS root servers

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2-13。What Is a DNS Query？
A query is a request for name resolution and is directed to a DNS Server
Queries are recursive or iterative DNS Client and DNS servers both initiate queries DNS servers are authoritative or nonauthoritative for a namespace An authoritative DNS server for the namespace will either： Return the requested IP address Return an authoritative “NO” A nonauthoritative DNS server for the namespace will either： Check its cache Use forwarders Use root hints

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MyNote What Is a DNS Query？

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2-14。What Are Recursive Queries？
A recursive query is sent to a DNS server and requires a complete answer

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2-15。What Are Iterative Queries ？
A iterative query directed to a DNS server may be answered with a referral to another DNS Server

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2-16。What Is a Forwarder？
A forwarder is a DNS server designated to resolve external or offsite DNS domain names

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2-17。What Is a Conditional Forwarding？
Conditional forwarding forwards requests using a domain name condition

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MyNote Conditional Forwarding？ 依據要查詢名稱的尾碼，優先交給設定的DNS Server查 Forwarder避免犯的錯誤： command prompt windows 底下： ipconfig /displaydns(顯示DNS IP) ipconfig /flushdns(清除DNS快取)

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