IST 233 Lecture Notes - Lecture 4: Icann, Distributed Database
16 May 2017
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Document Summary
Life got more complex as the network grew: need for small server subnets and large resnet subnets, su currently employs variable length subnet masks . Private addresses: 10. x. x. x; 192. 168. x. x; 172. 16. x. x - 172. 31. x. s, private addresses are not globally unique so they are not directly addressable over the internet, private addresses require nat to access internet. Purpose of dns: converts symbolic names to numeric ip addresses, dns is a mission-critical service, target of attack. Dns uses a hierarchy of domains: top level domains (tld"s) are defined under the root (. edu, . com, . net, . gov, . xxx, many more, second-level domains define an organization (syr. edu); lower-level domains are defined internally (ischool. syr. edu) Enterprise dns: organizations maintain dns for all internal computers, redundancy is critically important. Technical/architectural: global dns design: root server architecture (13 servers, replicated, distributed database design, public and private dns servers; dns name/address resolution.
