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--- protocols:dns [2026/07/03 12:48] – created v1ctor
+++ protocols:dns [2026/07/03 13:53] (current) – [Resource Records] v1ctor
@@ Line 3: / Line 3: @@
 There are three classes of DNS servers:
   - Root DNS servers
+    - There are more than 2000 root servers world wide. They are copies of 13 different root servers
   - Top Level Domain DNS servers
   - Authoritative DNS servers
+Finding authoritative DNS servers:
+<code bash>
+dig NS apple.com +short  # the NS record identifies which servers are supposed to be authoritative;
+                         # querying those servers directly and checking for aa confirms they actually are
+</code>
+===== Resource Records =====
+Resource record is a four-tuple - **(Name, Value, Type, TTL)**
+  * TTL determines when the resource should be removed from the cache
+  * Type **A**:
+    * ''Name'' is the hostname
+    * ''Value'' is the IP address