Shulou(Shulou.com)06/02 Report--

Labels: Zhang Zhaosen

1, Windows seven layer model from low to high: physical layer, data link layer, network layer,

Transport Layer, Session Layer, Presentation Layer, Application Layer

Applications in the Network

1. The role of ARP protocol: resolve IP address into MAC address

ARP spoofing: Intercepted messages

ARP***: is to make the network unable to access the Internet

2. Query the mac address of the target device through the target ip address to ensure communication.

smooth progress

3. Formation of routing table: manually configured by administrator, automatically learned by dynamic routing protocol

the

4. Directly connected routing is when the IP address is configured on the router excuse and the interface state is up,

where the interface is located.

0.0.0.0 in the default route represents all networks

Access to the network and all kinds of breeding

1, access methods are: traditional, ADSL, wireless, optical fiber, rental digital circuits and so on

2, ADSL than the traditional advantages: telephone, Internet access two do not interfere.

High-speed transmission, safe and reliable, exclusive bandwidth, easy installation, affordable

3. ssid: is the name identification of wlan and the most basic identification mechanism of wireless network.

What is WLAN?

wlan: radio waves, lasers, infrared rays, etc. instead of wired local area network part or

All transmission media constitute a wireless local area network wlan

2. Advantages: convenient installation, flexible use, economical saving, easy to expand

Disadvantages: Deficiencies in safety

Wireless network technology includes: 3G technology and 4G technology

5. Mainstream 3G operators include: China Mobile, China Unicom and Telecom

Mainstream 4G technologies include LTE-Advanced and Wireless MAN-Advanced.

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