Basic knowledge: Fast query of Computer Network Data

Basic knowledge: Fast query of Computer Network Data

This article provides several basic information about computer networks, including ASCII code table (octal, decimal, and hexadecimal), IP address classification, private IP address, and Ethernet frame construction.

1. ASCII code table (octal, hexadecimal)

2. IP address classification

3. Private IP

If an organization does not need to access the Internet but runs TCP/IP at the same time, select a private IP address. The Internet Router does not forward packets whose destination address is a private IP address.

4. Ethernet frame construction

5. Composition of IP Datagram

6. Composition of TCP Message segment Headers