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basic concept
LAN : LAN (Local Area Network (LAN)) is a computer network can be connected to a computer within a limited area of homes, schools, laboratories, universities and other campus or office building.
WAN : Wide Area Network (WAN) not only cover a large geographical distance, but also usually involves leased line and links to the Internet.
Internet : Internet is a broader, global business is connected to the system and personal computer.
ISPs (Internet Service Provider) ISP, ISP has its own room, to provide users access to an Internet connection. Different ISP connected to each other via private lines, global Internet.
Packet contains data, and the source IP address, destination IP address.
A data frame source MAC address included in the packet, and a data frame, the destination MAC address.
IP address and MAC address : IP address is located in the packet for indicating the source IP address and destination IP address. MAC address is used to indicate a source MAC address and destination MAC address.
OSI reference model function
Troubleshooting and security in different layers
TCP / IP protocol and the OSI Reference Model
Data encapsulation
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The relevant test indicators
Rate: single channel transmission rate of bit / s
Bandwidth: channel transmission rate limit bit /
throughput: amount of data throughput, the sum of a plurality of channels channels.
