First of all, Cisco certification includes: CCNA, CCNP, CCIE, and these three certifications are incremental levels. Entry to CCNA, intermediate CCNA, expert CCIE. If you follow the cisco requirements to study the exam, then the time to get the CCIE certificate will take about 3 to 5 years. However, the Chinese people will brush their cleverness and get the exam through the back-to-back question bank. At present, cisco has been under the influence of the magnifying mirror incident, and the domestically produced Huawei has indeed worked hard. As far as the current IT industry trends are concerned, I feel that learning the database is more promising.
For similar certifications, especially social-oriented certifications can basically be compared with the level of undergraduate education. If so, I think CCIE is roughly equivalent to a computer science graduate, and the research background and laboratory are graduate students in the network. almost. Or slightly lower than this. After all, graduate degree studies are not just about the Internet. Therefore, this certification, for a graduate student with a master’s degree or above and a research direction is a network, no matter from the perspective of knocking on the door or professional knowledge, the significance is not great. If your educational background is below this standard, then it makes sense in two ways.
The second aspect is the practical use. In the actual work, I have also encountered many people who have tested CCIE. For example, we are the product manager of the product. Many people have this thing. The first is to be arrogant, and the second is that this is not a development for non-computer majors. They need some common-sense knowledge base. As for the use of CCIE knowledge, it is of course useful for network work, but basically two years of work, you will find that the knowledge here is about the relative basics of the network, and the work needs far beyond these. . And when you need these things, you have learned to save time than you have never learned. The province is looking for information everywhere, taking the time to get familiar with it, but that’s all. Because, in the work you will always need to continue to learn, it is inevitable to find information and self-study.
In actual work, the learning ability and comprehensive application ability are far greater than the knowledge of a single door. For example, there is a project that requires you to optimize the module of the tcp fragment recombination part of your firewall. This is a simple look, as if you know C language and TCP / IP is enough. But in fact, this problem is very complicated. First of all, you need to understand your software interface, know what APIs are open to you, and you need to understand the basic concept of firewall forwarding, know how much space the session table has. Go to store your structure. Third, you need to understand your system structure, know how sensitive your CPU is to the cache, how sensitive it is to IO, and how long your data structure is designed to fit your cache line size. Fourth, you need to understand the existing module structure and how to organize it. Fifth, you need to understand the bottlenecks of existing modules. Here you may use a lot of tuning tools, gdb, profile, CUNIT framework, etc. And what I am citing is just your preliminary preparation work. You still think that you understand TCP/IP. Is it enough to test CCIE?
Therefore, there is no end to learning, and the road is still far away. But don’t be discouraged, in fact, these things are slowly accumulated. If you are a non-professional person, it may take more time to accumulate, but as long as you have perseverance and perseverance, see the water bridge, see the mountains, no disadvantage, you will Become a qualified network engineer