Shulou(Shulou.com)06/03 Report--

DNS introduction:

Usually when we surf the Internet, we enter the "domain name" in the browser, but eventually the data will be sent to the web server, which is still identified by the IP address.

So, in essence, the "web request" is actually sent to the IP address.

A DNS server is a "server" that translates domain names into IP addresses.

On the terminal devices that surf the Internet, the DNS server must be configured:

For example: www.baidu.com-61.135.169.121

Preparations for configuration:

PC is configured correctly

Configure IP address (manually configure + DHCP)

Verify IP address (graphical + CLI interface)

PC: start-> run-> cmd

Ipconfig

Ipconfig / all-- > View all the information on all the network cards on the PC

Include IP addr

Mask

Gateway

DNS server

DHCP server

The cable is connected correctly

Network cable

Straight line: the line sequence on both sides is the same; connect different types of devices

Cross lines: different lines on both sides; connect devices of the same type

Line sequence standard

568B 1 White Orange 2 Orange 3 White Green 4 Blue 5 White Blue 6 Green 7 White Brown 8 Brown

568A 1 White Green 2 Green 3 White Orange 4 Blue 5 White Blue 6 Orange 7 White Brown 8 Brown

(swap 1 and 3, 2 and 6)

Network cable classification

Anti-interference ability

CAT5

5E

six

seven

Optical fiber

Multimode fiber pure × × ×

Single-mode optical fiber has a long transmission distance

Control cable-console cable (reversal line)

Crystal head-RS232-> usb-> RS232

Crystal head-USB

Location of the console port:

Equipment front panel

Device rear panel

Note: there will be a clear word on the port-console

Interface:

FastEthernet 0/1 10Mbps

Ethernet 0/1 100Mbps

GitEthernet 0/1 1000Mbps

XGitEthernet 0/1 10000Mbps

X/Y/Z decomposition:

X-slot number

Y-module number

Z-Port number

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