1. 程式人生 > >菜鷄日記——Computer Networking: Overview of The Internet & The Network Edge (Section 1.1 & 1.2)

菜鷄日記——Computer Networking: Overview of The Internet & The Network Edge (Section 1.1 & 1.2)

Section 1.1: What Is the Internet?


Description 1: Basic hardwares and softwares make up the Internet.

Description 2: A networking infrastructure that provides services to distributed applications.

 Definition of a protocol: 

A protocol defines the format and order of messages

exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.

 

Section 1.2: The Network Edge


  bandwidth shared/dedicated range

DSL

(digital subscriber line)

upstream < 2.5Mbps

downstream < 24Mbps

dedicated  

HFC

(hybrid fiber-coacial cable)

upstream up to 2Mbps

downstream up to 30Mbps

shared  
Ethernet 10Mbps, 100Mbps, 1Gbps, 10Gbps    
wireless LAN

11Mbps, 54Mbps

(IEEE 802.11)

  100s ft
wide-area wireless access network 1~10Mbps   10s km