공부3

Terminology: 전문용어
  Network <-Share(A computer -> B computer): American
  ARPA(Advanced Research -) ->ARPA net
  DoD(Depart of Defence) ->DARPA(Defence --) -> DARPAnet

IPv4 ---> IPv6
Protocol(통신 규약): language
 (Ethernet/ ARP/ ICMP/ IP/ TCP/ UDP): Network의 핵심이다.

Circuit Switching vs Packet Switching
(telephone)          (internet)  

Packet switching is a digital networking communications method that
groups all transmitted data into suitably sized blocks, called packets,
which are transmitted via a medium that may be shared by multiple simultaneous communication sessions.
Packet switching increases network efficiency,
robustness and enables technological convergence of many applications operating on the same network. 

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https://en.wikipedia.org/wiki/OSI_model
https://en.wikipedia.org/wiki/MAC_address 
http://standards-oui.ieee.org/oui.txt
http://www.macvendorlookup.com/
https://en.wikipedia.org/wiki/Classful_network#Introduction_of_address_classes

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1.x.x.x
A Class Subnet Mask(SM) :255.0.0.0
00000001.xxxxxxxx.xxxxxxxx.xxxxxxxx
11111111.00000000.00000000.00000000 == 255.0.0.0
------------------------------------(AND)
00000001.00000000.00000000.00000000 ==> 1.0.0.0 (Network Address)

1.1.1.1의 네트워크 address =>1.0.0.0
1.2.3.4/8 --->1.0.0.0

192.168.0.1/24
C Class Subnet Mask: 255.255.255.0