FIT1047 Lecture Notes - Lecture 10: Address Resolution Protocol, Domain Name System, Default Gateway
12 Jun 2018
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Department
Course
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Document Summary
Each network interface in each device needs an ip address. = used by tcp/ip protocol to determine if a host is on the local subnet or a remote network (in which case sends to router) Checks if destination address is in the same subnet, and identifies other devices in same subnet. Class a: /8 (eg. ibm, mit, at&t, apple, ) Cidr (classless interdomain routing) removed the restrictions created by classful subnet masks (previously only /8, /16, /24, now can be classless like /22 etc) Gateway routers = allow you to communicate outside your local subnet. 32 bits long, written using dotted-decimal notation (eg. 255. 255. 252. 0) Subnets don"t always correspond to the hierarchy (in this case 10 bits instead of 8 aka /22) In theory, 4,294,467,295 address (4 bil), of which probably only half are usable, because difficult to assign hierarchal addresses for fear of wasting addresses. Since 128 bits per address, 340 undecillion addresses possible.
