Linux server security policy details

Article Title: Linux server security policy details. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Chapter 1 security threats to Linux Network basics and Linux servers

1.1 Linux Network Basics

1.1.1 Linux Network Structure Features

[IT expert network exclusive] Linux is very mature in the server field, and its influence is growing. Linux's network services are very powerful, but there is still a gap between Linux desktop applications and Windows. In addition to some Linux specialized laboratories, most enterprises, it is usually a heterogeneous network formed by operating systems such as Linux and Windows (or UNIX.

In a network system, the operating system is very important. Linux Network OS is famous for its efficiency and flexibility. It can realize all UNIX features on PC and has the characteristics of multi-task and multi-user. Linux has powerful networking capabilities, and its TCP/IP code is the highest level. Linux not only provides full support for the current TCP/IP protocol, but also supports the next generation of Internet protocol IPv6. The Linux kernel also includes IP Firewall code, IP anti-counterfeiting, IP service quality control, and many security features. Linux Network implementation is similar to FreeBSD. It supports FreeBSD's extended Sockets (socket) and TCP/IP protocols. It supports the network connection between two hosts and the Sockets communication model, and implements two types of Sockets: BSD Sockets and INET Sockets. It provides two transmission protocols for different communication models: unreliable, message-based UDP transmission protocol and reliable, stream-based TCP transmission protocol, it is also implemented on the IP Internet protocol. INET Sockets is implemented based on the above two Protocols and the IP Internet protocol. The relationship between them is 1-1.

Understanding the OSI network model, TCP/IP model, and relevant service levels is very important for understanding Linux network servers.

1.1.2 TCP/IP layer-4 model and OSI Layer-7 Model

Table 1-1 is the table corresponding to the TCP/IP layer-4 model and the OSI Layer-7 model. We map the OSI Layer-7 network model with the Linux TCP/IP layer-4 concept model, and then classify various network protocols.

 

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