Course: av9876107
1. LAN
1.1 Introduction
Small coverage, their own money to buy equipment, fixed bandwidth, maintain their own
1.2 The switch consists of the access layer, convergence layer.
1.2.1. And the machine is connected directly to the access layer switches, other switches distribution layer.
1.2.2. Regard access switch bandwidth is relatively small, the convergence layer bandwidth is relatively large, 10M, 100M, 1000M
1.2.3. On the bus, and longer than 100m, otherwise it will become weak signal, plus line charges increase
2. WAN
2.1 Introduction
Distance, to pay for the bandwidth
2.2.Internet
2.2.1.Internet composed by a number of ISP, providing Internet access to the network name by its own room
3. Network
3.1.ip
Each computer has an IP address, the IP address is a unique
3.2. The network ID and host ID
Subnet mask portion 255 is a network identifier, a host identifier part 0
3.3. Network Planning
ip address and subnet mask of the host planning
3.4. Gateway (Gateway)
It used to find the next jump address
3.5.MAC address (Media Access Control Address)
48-bit physical address binary
3.6.DNS resolve
When we visit a Web site, first of all incoming DNS server, DNS resolution to IP, IP to send data packets to give