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example, the username and password of the core network device transmitted over the network are in plain text. However, you can use SSH instead of Telnet to do the same job. At the same time, you also need to emphasize that you need to find a balance between ease of use and security based on the specific needs of the enterprise. David Davis has 12 years of experience in the IT industry and has passed many certifications, including CCIE, MCSE + I, CISSP, CCNA
This article describes in detail how to configure PPP authentication and CHAP authentication, and provides the command line for configuration. You can learn about the configuration process through the instance. When configuring PPP verification, select PAP and CHAP. PAP is the user name and password for the plain text transfer, which is not secure. CHAP uses hash values for verification. Passwords are not transmitted online, so the security is high. CHAP certification is also the basic configura
At present, vrouters and vswitches are widely used. Here we mainly introduce the comprehensive comparison between vrouters and vswitches. Cisco certification has always been regarded as a gold icon in the IT industry. In foreign countries, Cisco Junior network engineer certification-CCNA is called "high-paying express trains ", IT can be seen that the amount of gold and the degree of recognition in the industry, and the subsequent tiered professional
is not within the scope of this course ). To implement SSH, You need to generate an RSA key. RSA involves the public key and private key. The public key is retained on the public RSA server, while the private key is retained only by the sender and receiver. the public key can be made public to all users and used to encrypt messages. messages encrypted with the public key can only be decrypted with the private key. this is called asymmetric encryption. asymmetric encryption will be discussed in
done anymore. At present, there are more than 0.3 million global routes and there is no signs of slowing down. Of course, the training of CCNA can also get on fire, and the threshold for developing enterprises to enter such complicated technical fields is too high. After studying this issue, Ipbaobao believes that only dynamic routing technologies were used in the past, and there were about five original ones: 1) The Internet is experimental. Even if
When routers and switches work normally, you do not need to worry too much about wiring issues. However, when the network encounters problems or changes, wiring knowledge may be of great help to you. In this article, we will introduce you to some basic wiring knowledge, and describe the details of the Cisco console dedicated network cable. The network cable belongs to the first layer of the Network: physical layer. Only the correct network cable can ensure the normal operation of the network. In
100.100.100.100!interface Ethernet1/0ip address 23.1.1.2 255.255.255.0!ip route 10.10.10.0 255.255.255.0 23.1.1.1ip route 20.20.20.0 255.255.255.0 23.1.1.1 Configure Router2 as follows: interface Ethernet1/0ip address 10.10.10.1 255.255.255.0ip helper-address 23.1.1.2!interface Ethernet1/1ip address 23.1.1.1 255.255.255.0!interface Ethernet1/3ip address 20.20.20.1 255.255.255.0ip helper-address 23.1.1.2 The DHCP experiment results are as follows: PC2：R1#Interface FastEthernet0/1 assigned DHCP a
in a full way to create a secure Web environment.Most of the vulnerabilities may not be considered "critical", but they must be problematic for a long time. As you can see, they are relatively simple to solve. In fact, it's only your time to solve their only consumption. By finding and resolving these issues, the security of the business will be successful and will help the vulnerability scanning and security assessment reports look clean.Once you've dealt with the security of Web server fundam
Troubleshooting of vswitch Network Communication Cisco's catalyst switches are generally not prone to faults. Once a fault occurs, it is usually difficult for CCNA certified trainees to detect and troubleshoot, this section summarizes some minor faults that often occur during the use of vswitches to help students pass authentication and adapt to a simple working environment. Faults related to physical layer connection: Physical Layer line connectio
aspects may not be needed, because the O M personnel still need to check the most, which optimization and Development Statements won't be used by you. Mysql (detailed ideas for manual compilation, addition, deletion, modification, query, authorization, and backup and restoration) 7. Firewall is hard to learn. Firewall is also a difficult problem. It is easy to say, easy to say, and the most important thing is to understand the rules. If you have learned
. What is the scope of application of the protocol? OSPF is mainly used in the LAN construction of medium-sized companies, from two to 2000 devices. Of course, this is not only limited to 2000 servers, but also more. BGP is applied to a larger scope. Generally, a data center is connected to the entire internet. For more information, see Cisco CCNA and CCNP. 4. Why should I use OpenBSD to replace Cisco and Huawei vrouters? I am familiar with Cisco
(config-line) # login * Indicates logon authentication for telnet. Router (config-line) # password ccna * configure the logon password for telnet. Router (config) # enable password ccna2 * configure the enable user password for the vro. Step 3:Use the protocol analyzer to obtain data frames for Telnet. Enable the protocol analyzer before Telnet to the target vrotelnet r1194251.1 on the host at 192.168.1.2. Then, complete the Telnet logon. After the
, see About the work of programming, any treatment slightly better, will mention such as: good English reading and writing ability, can read English API interface and so on, visible English has become the programming work to get a high salary condition. 3, all you need is written in English as a programming person, there is a household name of the site-stack Overflow, because the site provides a variety of questions about programming technology, we can find many answers from this site, including
When we were 18 years old and found that time is like a meteor flies, once in school every day sigh time too slow to read the novel pass time. 2015 I was 23 years old to greet is 24 years old but how can I say very tangled, on the technical road has been hovering not before the salary naturally, it is time to calm down to think about my way out.2015 look back before have done desktop operations, ERP operations, but also contact network management but did not very deep, do ERP operation, database
Let me introduce myself.Study number 78, this year 20, is only a college student, before the vocational school read 2 years of secondary school, then entered the adult education of Chengdu University of Science and Engineering, hoping to get better learning opportunities. However, the reality is always cruel, even under the name of UESTC, the quality of adult education is still unsatisfactory, so the majority of the time spent in the self-learning and ascension.Some of the things I've learned
an in-depth understanding of ISP networkshope to obtain a certificate: CCNA, CCDASecurity Aspects (Security)Background: Shallow understanding of firewallsDemand:1. want a comprehensive understanding of the security system2. hope to have a thorough understanding of the network in full3. want to have a certain understanding of safety regulations, etc.hope to obtain a certificate: CompTIA security+, CISA, CISSPSystem Aspects (System)Background: Ye
the reproduced format is not messy ... Otherwise it's better not to turn ...Of course, if you would like to write about the process of tossing and writing ... I don't want you to do KOL or anything. Just record your own life ...For example, toss a VIM plug-in ... such as the OpenVZ machine installed XP and so on ... Everything is possible ...If you do not want to write things also lazy reprint ... Leave a micro-bo what can be done ... In short not see the word also convenient I know you ...You'
Some comments about the research, those with evidence, and those with the research have all seen the completion of the ccnp. Here I want to say a few words to my friends. I am a network administrator. After MCSE + ccnp, I have long wanted to post this post, but I have never had time to sort it out, because during the time of chrysanthemum, I have seen a lot of questions and opinions on the certificate, and I want to talk about it here. it is silly to say that the purpose of learning Na was to le
What does Nginx do? Why is he so valued?For this problem in the simplest terms, Nginx is similar to a valve software, he to control the flow to the side, to achieve load balancing. such as landing a very hot site, although the site is a domain name, but certainly the room will not be only a server, but a good dozens of or hundreds of thousands of servers in the work together, when the user access, Nginx will be assigned according to the situation users to different sub-server access, This will n
realize that I did not give my parents a little common sense of my major. Confused Confusion is due to less work. Indeed, you do not understand anything, of course, I do not know the computer industry segments in the end which more potential? What's more, you've just come into contact with "real" computers. So always want to get rid of this chaotic confusion, will "not choose the pros and cons" find something to learn. In addition to specialized courses, will also self-study
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