Computer Network NSD Network Day1

Section one: TCP/IP protocol and configuration:
English full name: Transmission Control protocol/internet Protocol, Chinese: Transmission Protocol/Internet Protocol/Network communication protocol;

Three main elements of communication between host and host: 1.ip address 2. Subnet Mask 3.ip Routing

The role of IP address: used to identify a node of the network address;

Classification of IP addresses (IP address):

Class A: 1~126, writing form: Network bit + host bit + host bit + host bit;

Class B: 128~191, net + Net + master + master;

Class C: 192~223, net + Net + Net + master;

Multicast and scientific research-specific:

Class D: 224~239, multicast is multicast or broadcast

Category e: 240~254, scientific research

Default subnet mask (subnet mask)

Class A address: 255.0.0.0

Class B Address: 255.255.0.0

Class C Address: 255.255.255.0

IP routing (IP router)

What is a gateway: "gateways" connecting from one network to another

The IP address is divided into the total address and the private address, the common address needs to apply, but the private address is not used;

Scope of use for enterprise private network addresses:

Class A IP address range: 10.0.0.1~10.255.255.254;

Class B IP address range: 172.16.0.1~172.31.255.254;

Class C IP address range: 192.168.0.1~192.168.255.254;

Basic Configuration environment:

Change the computer name and workgroup name: Start → control Panel → system → change settings → select change restart effective;

TCP/IP parameter settings: 1. Obtain the IP address automatically, 2. Obtain the IP address manually (increase the administrator burden, error-prone, suitable for enterprise internal server use);

Configure IP Address: Right-click on the desktop network → properties → change adapter settings → Double-click Internet Protocol version 4 (TCP/IP v4) → configuration complete click OK;

View IP active Configuration: Change adapter settings → local connection → details;

Use the command to view the IP valid configuration: Run named: ipconfig or ipconfig/all; Open with the lower left corner start → command prompt → input command, or "win" +r→cmd→ input command;

Use the ping command to test the connectivity of the network: Loopback test (ping 127.0.0.1) can ping, Description: TCP/IP protocol is installed, can send and receive TCP/IP protocol packets;

Could not successfully ping pass:

1.ping Request Timeout: A, check whether the firewall is off, B, check whether the ping host is the same network as its own host;

2.ping prompt transmission failure: A, check whether the gateway is configured, B, whether in the same network segment;

3. Website Access failed: Ping www.baidu.com test can ping pass, can not be NDS server address configuration error or not configured;

Computer Network NSD Network Day1