Computer Network Vulnerabilities and the Significance of Preventive Measures

The Significance of Computer Network Vulnerabilities and Preventive Measures On Computer Network Security Vulnerabilities and Preventive Measures

In the network era, network security has attracted more and more attention from computer users. How to effectively build your own secure computer network and how to effectively protect your important information, this paper will introduce several aspects of network security to you and provide you with some effective preventive measures and suggestions.

There are a group of people familiar with network technology on Inter, including many network geniuses. They often take advantage of some existing loopholes in the network and try their best to get into other people's computer systems. Some people just want to feast their eyes, or just out of personal interest, like to pry into other people's privacy. These people usually do no harm. However, some people invade other people's computer systems with bad motives, and usually peek at confidential information or destroy their own computer systems. We call these people "hackers" at Inter Milan.

However, fundamentally speaking, absolutely safe computers do not exist, and absolutely safe networks are impossible. Only a computer that is stored in an unknown secret room and unplugged can be called safe. As long as it is used, there are more or less security problems, but the degree is different. Common threats mainly come from the following aspects:

1, natural threat. Natural threats may come from various natural disasters, harsh site environment, electromagnetic radiation and interference, natural aging of network equipment, etc. These unpredictable events sometimes directly or indirectly threaten the security of the network and affect the storage and exchange of information.

2. Unauthorized access. It refers to the act of skillfully writing and debugging computer programs, and using this writing skill to gain illegal or unauthorized access to networks or files and invade the internal network of the other party. The main purpose of network intrusion is to gain the storage right, writing right and access to other storage contents of the system, or to maliciously destroy the system, so that the system is destroyed and loses its service ability.

3. Back door and Trojan horse. Since the earliest computers were invaded, hackers have developed' back door' technology, with which they can re-enter the system. The main function of the back door is to make the system administrator unable to prevent the grower from entering the system again; Therefore, growers are not easy to be found in the system; It takes the shortest time for growers to enter the system.

4. Computer virus. Computer virus refers to a set of computer instructions or program codes compiled or inserted into a computer program, which destroys computer work and data, affects computer use, and can replicate itself. For example, a common worm virus is a kind of malignant viruses that spreads through the network. It takes computers as the carrier and takes advantage of loopholes in operating systems and applications to actively attack Jining. They have some characteristics of viruses, such as transmission, concealment, destruction and latency. At the same time, they have their own characteristics, such as not using file parasitism (some only exist in memory), causing denial of service to the network, and combining with hacking technology. Other common destructive viruses are macro virus, Italian sausage and so on.

First, computer network security precautions

The preventive measures of computer network security can be considered and solved from two aspects: technology and management.

1, to solve the security problem of information network technically.

(1) data backup. Copying means copying all the useful files and data on the hard disk to another place, such as a mobile hard disk, so that even if the computer connected to the network is attacked and damaged, you don't have to worry, because there is already a backup, just copy the required files and data back. Doing a good job of data backup is one of the most direct and effective measures to solve data security problems. Data backup methods include full backup, incremental backup and differential backup.

(2) Physical isolation gateway. Physical isolation gateway is an information security device that connects two independent host systems by using solid-state switch read-write media with multiple control functions. Because in the next year, there will be no physical connection, logical connection, information transmission command and information transmission protocol between the two independent host systems connected by the physical isolation gateway, no data packets will be forwarded according to the protocol, only data files will have no protocol ferry, and solid-state storage media will have only two commands: read and write. Therefore, the physical isolation gateway is physically isolated, blocking all connections with potential attacks, making it impossible for hackers to invade, attack and destroy, thus achieving real security.

(3) Firewall technology. A firewall is a kind of software that is located between a computer and the network it is connected to. All network traffic in and out of this computer must pass through the firewall. The firewall scans the network traffic flowing through it, which can filter out some attacks before they are executed on the target computer. Firewalls can also close unused ports, but also prohibit specific ports from flowing out of communication and intercept trojans. Finally, it can prohibit access from special sites, thus preventing all communication from unknown intruders. It protects the network security to a great extent.

It should be noted that network security is usually at the expense of openness, convenience and flexibility of network services. The setting of firewall is no exception. Because of the partition function of firewall, on the one hand, it strengthens the security of intranet, on the other hand, it hinders the communication between intranet and Inter. Therefore, it is necessary to attach various information service proxy software to the firewall to proxy the information communication between the intranet and the outside world, which not only increases the network management overhead, but also slows down the information transmission rate. Therefore, generally speaking, only when there are special requirements for personal network security and it is necessary to connect with the Internet, enterprise network and company network, it is recommended to use a firewall.

In addition, the firewall can only block the intrusion of the external network, and the security of the internal network needs to be realized through effective control and management of the internal network.

(4) Encryption technology. Another very important means of network security is encryption technology. The core idea is that all important information is encrypted because the network itself is not safe and reliable. In network security, encryption, as the key to system security, is one of the important means to realize network security, and the correct use of encryption technology can ensure the security of information. The basic process of data encryption is to process the original plaintext file or data according to a certain case, making it an unreadable code, usually called' ciphertext', so that the original content can only be displayed after inputting the corresponding key. In this way, the purpose of protecting data from being stolen and read by illegal personnel can be achieved. The reverse process of this process is decryption, that is, the process of converting encoded information into its original data.

Encryption technology has two main uses, one is to encrypt information; The other is the digital signature of information, that is, the sender encrypts the information with his own private key, which is equivalent to signing the message. Anyone can decipher the message only by using the sender's public key. On the one hand, it can prove that this message is indeed sent by this sender and has not been changed by others afterwards (because only the sender knows his private key), on the other hand, it can ensure that the sender is responsible for the message sent by himself. Once the news is sent and signed, he can no longer deny the fact. If you need both confidentiality and signature, you can combine the two steps described above. That is, the sender first signs with his own private key, then encrypts it with the public key of the receiver, and then sends it to the other party. On the contrary, the receiver only needs to decrypt it with its own private key, and then verify the signature with the sender's public key. This process is a bit cumbersome. In fact, many softwares can realize these functions with only one command, which is very simple and easy.

(5) Solve the problem of information network security from the management. While emphasizing technology to solve information network security, we should also make great efforts to strengthen the management of network personnel and pay attention to management methods and implementation means, because many unsafe factors are reflected in organizational management or the entry and use of personnel at work, and the middle is the basic problem that computer network security must consider.

(6) Proper system management will minimize the insecurity of the network under the existing conditions.

At present, most problems found on Unix are attributed to some programming loopholes and poor management. If every network and system administrator can pay attention to the following points, then under the existing conditions, network security risks can be minimized:

A. password management. Most of the loopholes found at present are due to poor password management, which makes hackers take advantage of it. Therefore, the effective management of passwords is very basic and important.

B. User account management. When establishing accounts for users, we should pay attention to ensure that each user's UID is unique, avoid using public accounts, close expired accounts in time, regularly check accounts that have not been used for a long time, and close them if necessary. Because such accounts are usually the target of "hacker" attacks, they can be tampered with for a long time without being discovered. )

The correct management of C.Id/Xid. Id is a super server, which allows dozens of servers to run on one machine at the same time. It listens on the ports of these services on behalf of these servers. When a service request comes, it will start the corresponding server, which can be configured reasonably through its configuration file/ect/id.conf.

D. use the r command carefully. The r command enables users to perform remote operations without providing a password. Therefore, while it is convenient, it also brings potential security problems. Therefore, users are advised to check it. When rhosts suspect that their system has been invaded, they will immediately submit the file and check the date and content of the last modification. Note that the file cannot have "++",otherwise any user on the network can access your account at will without knowing your password.

In addition, it is important to note that some special accounts (such as news,

E, x management. The use of X undoubtedly makes the computer network icing on the cake. It not only provides a good graphical user interface, but also enables users to call X programs of remote nodes locally through the network. At the same time, it is precisely because of the wide application and cheap X terminal that it is popular.

Strengthen the security measures of information server. If the open information server itself is not safe, it is equivalent to opening a loophole in the protective cover of the system, so no matter how much other security work is done, it is in vain. Therefore, the system administrator and the administrator of the information server must pay close attention to the security settings of the server itself and update the version at any time. At present, almost all information servers (such as) provide security settings.

In a word, there are many measures to solve security problems, and it is difficult to solve network security problems only by one or more of them. In specific work, it is necessary to formulate detailed and comprehensive multi-level security protection measures according to the actual situation of the network, so as to improve the security and reliability of the network as much as possible and make the network system serve everyone more safely.

Talking about computer network security vulnerabilities and preventive measures, where should the paper start? Urgent to solve. Thank you. First of all, what is a computer security vulnerability and what is its harm. Say a few more words and give a few examples each.

Secondly, how to prevent and avoid computer vulnerabilities, introduce soft and hard firewalls, and explain that vulnerabilities are inevitable through computer principles. For example.

Finally, sum up.

Some measures to prevent computer network security 1. 1 Install network protection software in the computer.

In order to prevent computer network security from the source, it is necessary for Guangzhou website construction company to install network protection software in computers. Only in this way can computer security be effectively protected.

1.2 Download the patch in time when the computer is in use.

In the process of using the computer, you need to download the corresponding patch in time. If you don't download some corresponding patches in time during network use, the possibility of system being invaded will be greatly improved.

1.3 Back up computer data in time.

In the process of computer use, backing up the data information in the computer in time can also reduce the loss caused by computer network security problems to a certain extent.

1.4 application of computer encryption technology

Encrypting some important files by professional computer means is commonly known as encryption technology. Computer encryption technology mainly includes file encryption technology and signature encryption technology.

Computer virus analysis and preventive measures hello, I have sent you three related papers, please check it, I hope it will help you!

If you need to retrieve papers in the future, you can find me or other players, as easy as blowing off dust. Help others as easy as blowing off dust!

-Baidu knows it's simple. Team leader: Xiao Bin 1 1 Blue Cat.

Computer network security and what preventive measures should be taken? Computer network security refers to the use of network management control and technical measures to ensure the confidentiality, integrity and availability of data are protected in the network environment. Computer network security includes two aspects, namely physical security and logical security. Physical security refers to the physical protection of system equipment and related facilities to prevent damage and loss. Logical security includes the integrity, confidentiality and availability of information.

Computer network security precautions:

(1) Using virtual network technology to prevent intrusion means based on network monitoring.

(2) Using firewall technology to protect the network from hackers.

(3) Virus protection technology can prevent and kill viruses.

(4) Use intrusion detection technology to provide real-time intrusion detection and take corresponding protection measures.

(5) Security scanning technology provides strong support for discovering network security vulnerabilities.

(6) Adopting authentication and digital signature technology. Authentication technology is used to solve the identity identification of both parties in network communication, and digital signature technology is used to realize the non-repudiation requirement in communication.

(7) VPN technology is adopted. We call the private network realized through the public network VPN.

(8) Use the security technology of application system to ensure the security of application platforms such as e-mail and operating system.

What are the main measures to prevent computer network viruses? There should be security software on the computer. Don't let the computer run naked. It will test the security of your surfing or downloading. It seems that all the security software functions are quite complete, which is enough for ordinary users.

What is the meaning of root in computer network? Root node of the network? It's a border router, right?

Computer network service is of great significance. If there were no internet, computers would not be used so quickly, and they would not be able to enjoy information and surf the Internet. I don't think many people can use computers. Computer network service is to provide information service.

(a), the network administrator

■ Title: Junior year.

Working in small and medium-sized enterprises, covering network infrastructure management, network operating system management, network application system management, network user management, network security management, information storage and backup management, and network computer room management.

These management involves many fields, and the management of each field has its own specific tasks.

■ Lord

Computer Network Security: What are some examples of using specific preventive measures for specific network vulnerabilities? Who can help me with vulnerability scanning, intrusion detection and intrusion prevention?