It is never too late to learn. —— Gorky
Preface
Before the advent of TCP/IP, computer networks were designed to connect each computer for information exchange, and could only communicate between limited devices. Due to the limited number of devices that can be connected, the use of the network is also restricted to a large extent, which obviously cannot be compared with the convenience of modern networks. It is against this background, in order to be able to connect more devices freely and simply, and build a network that is easier to use, researchers developed TCP/IP.
Now, the network is no longer limited to just connecting computers. Through TCP/IP, various devices such as automobiles, digital cameras, and household appliances can also be connected. Currently, computer system virtualization and cloud computing, which are widely advocated, are also using network technology with TCP/IP as the core. Therefore, modern network technology based on TCP/IP has penetrated into the control of various devices and the transmission of information between them, and has evolved into an important social infrastructure.
Therefore, in order to construct and operate a secure network environment that makes users feel at ease, it is urgent to understand TCP/IP. This book aims to allow readers to understand the basic knowledge of TCP/IP and master the basic skills of TCP/IP.
table of Contents
content
Chapter 1 Network Basics
Computers are having an immeasurable impact on our society and life. Nowadays, computers have been used in various fields, so that some people say that "the greatest invention of the 20th century is the computer." Computers are not only widely introduced into offices, factories, schools, educational institutions, and laboratories, but it is also common to use personal computers at home.
- The background of computer networks
- Seven stages of computer and network development
- protocol
- Who stipulates the agreement
- Protocol layering and OSI reference model
- OSI reference model communication processing example
- Classification of transmission methods
- address
- Elements of the network
- Modern network reality
Chapter 2 TCP/IP Basic Knowledge
At present, in the field of computer networks, the TCP/IP protocol is the most famous and the most widely used. So how did TCP/IP gain such widespread popularity in a short period of time? Some people think that the PC operating system such as Windows and Mac OS support TCP/IP. Although there is some truth to this, it cannot be regarded as the fundamental reason for the popularity of TCP/IP.
- The background and history of TCP/IP
- Standardization of TCP/IP
- Internet basics
- TCP/IP protocol layered model
- TCP/IP layered model and communication example
Chapter 3 Data Link
TCP/IP does not define the data link layer and the following part (physical layer) of the OSI reference model. Because TCP/IP assumes that the functions of these two layers are transparent. However, knowledge of the data link plays a vital role in understanding TCP/IP and the network.
- The role of the data link
- Data link related technology
- Ethernet
- Wireless communication
- PPP
- Other data links
- Public network
Chapter 4 IP Protocol
The heart of TCP/IP is the Internet layer. This layer is mainly composed of two protocols, IP (Internet Protocol) and ICMP (Internet Control Message Protocol). This chapter only describes the IP protocol in detail. Other IP-related protocols such as DNS, ARP, ICMP, etc. will be introduced in detail in Chapter 5.
- IP stands for Internet Protocol
- IP basics
- Basic knowledge of IP address
- Routing control
- IP segmentation processing and reconstruction processing
- IPv6
- IPv4 Head
- IPv6 header format
Chapter 5 IP Protocol Related Technology
When visiting a Web site and sending and receiving e-mails, we usually directly enter the Web site address or e-mail address and other addresses provided by the application layer instead of using a certain IP address composed of decimal numbers. Therefore, in order to allow the host to communicate based on the actual IP packet, it is necessary to implement a function-mapping the address used in the application to an IP address.
- Communication cannot be completed by IP alone
- DNS
- ARP
- ICMP
- DHCP
- NAT
- IP tunnel
- Other IP related technologies
Chapter 6 TCP and UDP
There are two representative transport layer protocols in TCP/IP, which are TCP and UDP. TCP provides reliable communication transmission, while UDP is often used to transfer broadcast and detailed control to applications. In short, according to the specific characteristics of communication, it is very important to select the appropriate transport layer protocol.
- The role of the transport layer
- The port number
- UDP
- TCP
- Other transport layer protocols
- UDP header format
- TCP header format
Chapter 7 Routing Protocol
The Internet is a combination of networks connected by routers. In order for the data packet to reach the target host correctly, the router must forward it correctly on the way. This process of forwarding data in the "right direction" is called routing control or routing.
- Definition of routing control
- Routing control range
- Routing algorithm
- RIP
- OSPF
- BGP
- MPLS
Chapter 8 Application Protocol
The IP protocol, TCP protocol, and UDP protocol introduced so far are the most basic parts of communication, and they belong to the lower half of the OSI reference model.
- Application layer protocol summary
- Remote login
- file transfer
- www
- Network management
- Other application layer protocols
Chapter 9 Cyber Security
The Internet provides people with many convenient services. In order to allow people to use the Internet better and more safely, some convenience must be sacrificed to ensure network security. Therefore, "convenience" and "security" coexist as two opposing features, and many new technologies have been produced. With the continuous renovation of malicious use of the network technology, network security technology is also constantly improving.
- TCP/IP and network security
- Elements of cyber security
- Fundamentals of Encryption Technology
- Security Protocol
appendix
- Convenient resources on the Internet
- Basic knowledge of IP address classification (A. B, C)
- Physical layer
- Basic knowledge of transmission media
- Insert map
to sum up
This is a network management technology book with both pictures and texts, designed to allow readers to understand the basic knowledge of TCP/IP and master the basic skills of TCP/IP. The book explains the basic knowledge of network, TCP/IP basic knowledge, data link, IP protocol, IP protocol related technology, TCP and UDP, routing protocol, application protocol, network security, etc., to guide readers to understand and master TCP/IP, Create a safe and secure network environment.
This illustrated network notebook has a total of 543 pages. Friends who need the full version can get it in the following way! ! ! In addition, there are also interview documents and video courseware (described below).
Attached interview documents
Graphical HTTP five major interview questions
Graphical TCP interview questions
Illustrated IP family bucket interview questions
With video courseware
This illustrated network notebook, interview document, and video courseware. Friends who need the full version can get it in the following ways! !
Leo Tolstoy said: "The correct path is this: absorb what your predecessors have done, and then move on . " I hope everyone can also walk on the right path, come on!