CAS CS 101 Lecture Notes - Lecture 7: Circuit Switching, Domain Name System, Dot-Decimal Notation
7 Jan 2018
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Two things to remember: every address is unique, every connection is between two devices (point to point) Two ways to connect: generally, there are two ways to connect devices together in a network, simplest way is to emulate the old telephone network, where each device connects directly to another, this is called circuit switching. Circuit switching: a connection (circuit) is made between two devices, the circuit is said to be nailed up , disadvantage: line is tied up when in use. Internet uses this: connecting from device to device are managed by routers, they look like 192. 68. 1. 16 (convenience for us: dotted decimal ) The default route: each router has an extra point called default that"s used when the router doesn"t know how to deliver a message. Domain name service (dns: goes from names to ip addresses, just like routes, dns set up like a hierarchal tree.
