Linux Basic Network knowledge

1, understand the OSI seven layer model, and the five layer protocol structure.

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2. Understanding the TCP three-time handshake and four-time disconnection

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3, ifconfig Display information description

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Maximum Transmission unit of MTU NIC

inet Internet IP

netmask Subnet Mask

Broadcast broadcast address

Error message caused by network media or NIC module

Dropped: Packet loss due to kernel accepted but no buffering system

Overruns: Packet loss due to inconsistent buffer size

Ifconfig up boot NIC

Ifconfig Down network card

Ifconfig Add IP address netmask subnet mask temporarily change IP address system restart failure

4. Permanently save NIC configuration information

vim/etc/sysconfig/network-scripts/if-NIC

Onboot Boot Yes or no

Type network types

Bootproto DHCP or static

IPADDR the IP address to set

Subnet mask set by NETMASK

Broadcast the broadcast address to set

Gateway Gateways

Note After Centos7

Dns1=dns Address

Wq Save exit

5. DNS Settings

Vim/etc/resolv.conf

NameServer DNS Address

Wq Save

Linux Basic Network knowledge