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+---
+title: "dns"
+aliases: 
+tags: 
+- cosc203
+---
+
+record has four fields
+- name
+- value
+- type
+- ttl
+
+meaning of name an value are dependent on type
+
+Types
+- A
+	- name - hostname
+	- value - ipv4 address for the hostname
+	- hostname to ipv4 mapping
+- AAAA
+	- same as A but ipv6
+- NS
+	- name - domain (e.g., otago.ac.nz)
+	- value  - hostname of authoritave DNS server that knows how to get the IP address for hosts in the domain
+	- used to route DNS queries further along th
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