For some of the most basic understanding of Cisco certification (CCNA, CCNP, CCIE)

Cisco CCNA, CCNP, CCIE, and corresponding network support engineers are Cisco Certified Network Engineers, Intermediate Network Engineers, and Network Experts, respectively. Levels from low to high in order, only through the previous level of certification exam, are eligible to participate in the next level of certification exam.

CCNA

1, CCNA only need to test a book, mainly network basic knowledge, OSI seven-layer model, exchange, routing and other simple debugging and installation;

2, if you want to test Cisco CCNA, it is recommended that you can go to the bookstore to purchase point materials, and carefully study it yourself. In contrast, the Cisco CCNA certification exam is the easiest Cisco certification! Because you only need to pass one exam to get CCNA’s certificate, so can you tell us that Cisco CCNA can pass the self-study exam? The answer is: of course;

3, CCNA’s exam costs about 100 US dollars;

4, CCNA is all on the machine test questions, give you print results immediately after the end of the test! Through a look at it or not.

CCNP

CCNP exam four books, content on the basis of CCNA more in-depth and more comprehensive, of course, the difficulty is naturally greater! Correspondingly, CCNP needs to pass four course exams to get a certificate. The difficulty is a step up from CCNA!

CCIE

1. First of all, give you a shot: CCIE is very difficult, and it is naturally the most difficult in Cisco certification;

2. CCIE is divided into two parts: written examination and operation. Relatively speaking, the difficulty of operation is much greater than the written test! The difficulty of writing is not low, and the difficulty of operation can be imagined;

3, CCIE examination time is about half a day;

4, CCIE exam costs about 10,000 yuan.

5, CCIE only through the written test and operation are passed, in the true sense of the adoption of CCIE certification!

Because CCIE has fewer people, high recognition, and strong practicality, whether it is at home or globally, the Cisco CCIE’s gold content is very high!

As for CCDA and CCDP, they correspond to CCNA and CCNP, respectively. The difference lies in the emphasis on the network architecture and design, that is, corresponding to the position of pre-sale network support engineers.

Take this as the background. Passed CCNA/CCDA, at least can guarantee that you can find network technical support for such a job, and the position is still quite many; passed CCNP, probably equivalent to the middle and high-level engineers; if you pass the CCIE, the cattle will not succeed !

Most people may have heard this statement: Cisco certification has no future! Because there are too many people who have tested Cisco certification, the industry is saturated!

Here, I want to say: The IT market simply does not have “saturation”! No, not even in the future! To do technology, there is always only a high degree of technical exquisiteness. Learn CCNA, CCNP, CCIE, you will be very good in the future!

What kind of person is the one who says these things: The first category is that even Cisco certification fails to get started, the industry loser; the second category is Cisco certification to a very high level, and enjoy good treatment Of course, this kind of person is more selfish and it is kind of loser!

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CCNA exam code, question type and passing score

A: The CCNA exam code is 200-125, the test time is 140 minutes, passing score is 810 points with total 1000 scores. Exam questions: multiple choice questions, drag and drop questions and lab questions. At present the general examination is about 50 questions. The examination questions are randomly selected, and at least 3 lab questions. The drag and drop questions about 0-3, and the rest are multiple-choice questions.

(1) The multiple-choice questions are the original questions, the description of the questions and options and the question bank are the same, and the order of the answers will be changed.

(2) drag and drop questions, the exam only check the final result is correct to give points, calculate the subnet mask some drag questions, drag the left IP address to the corresponding position in the right figure, the IP address will be change during the exam. The question type is exactly the same. When you check the question, you must understand and master it.

(3) The lab questions, question type, test points and question method will not change, and the lab data will change. The lab questions are simple drag and drop, or enter the command directly on the original question (in the place of the input command can directly hit the command is very simple.

(4) Score, there is no specific score for each item of the CCNA exam, the final score is 300 points, and there is also 300 points if there is no answer. The multiple-choice question and the drag-and-drop question are about 10 points. The total score of the test question is about 300 points.

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What basic entry-level knowledge is required to learn about CCNA?

CCNA is the first step in Cisco certification. In order to better integrate CCNA learning, we can first have a general understanding of the basic knowledge of CCNA. At least say some of the frequently mentioned terms, you always have to know what it means? Some common network equipment, you always have to know what is it? There are some basic definitions of LAN and WAN.

1, network nouns:

1) Domain: formerly defined as the border of a security system. But now that it has been extended by the security system too much, a more accurate description should refer to a range.

2) Collision: in Ethernet, when two nodes transmit data at the same time, the frames sent from the two devices will collide with each other, and they will meet on the physical medium and the data will be destroyed. In simple terms it means: the collision of data.

3) Collision domain, a network segment support shared media. Combining the definition of “conflict” with the definition of “domain”.

4) Broadcast domain is the network range for broadcast frame transmission. Generally, the router sets the boundary (because router does not forward broadcast).

5), broadband the amount of information flow from one end of the network to the other end of the unit time. The basic unit is bit/s. We often say that slow internet access means bandwidth.

2, network equipment:

1) Repeat: Add network node to amplify the signal; Suppose we use network cable to transfer data from one computer to another. The transmission of data use network cable is limited by distance. Different network cable distance restrictions are also different. Some can transmit 50 meters and some can transmit 100 meters. This depends on the quality of the line and the shielding effect of the line. If we are now separated by 500 meters, it is very difficult to use network cable to transmit. Then we can indirect a repeater in the middle, so that the signal can be amplified and transmitted better.

2) Bridge, the second layer of OSI reference model, controls broadcasts, maintains address tables, and only check MAC addresses to filter network information and data packets. It does not care about protocols; it can be understood as a switch branch. Because bridges are converted based on MAC tables, there are few supported features, and the port density is small enough to control broadcasts. Maintain a MAC address table, where the MAC address is a Layer 2 address.

3) HUB-Shared Hub: Propagates signals over the network, without filtering functions and path detection or exchange, used for network concentration points.

4) Switch hub: Layer 2 data exchange equipment, wire-speed switching. MAC address learning: frame filtering, loop avoidance;

5) Router: The third layer equipment provides path selection and data forwarding.

3, LAN WAN

1) Local area network: A high-speed, low-error-rate data network with a range of several kilometers, a network with a transmission delay of less than 10ms, working in a limited geographical area, and not applying for network-related technologies through the ISP: Ethernet, Token Ring and so on. The network in the office is a local area network, but the title is called enterprise network because it is in the enterprise. The network between buildings is also local area network, but it is called building network. The community network is also local area network.

2) Side-area netwirk: A data communication network that can serve users in a very wide geographical area, and generally uses transmission equipment provided by public equipment. The more popular understanding is the Internet.

The difference between the two is still quite obvious! The technologies of the WAN and LAN are completely different and the directions are different!

4, WAN equipment

1) Modem;

2) Router;

3) CSU/DSU (channel service unit/data service unit);

4), WAN switch: L3

5) ATM (asynchronous transfer mode), which is a type of network, is now replaced by Frame Relay, and Frame Relay is replaced by MPLS. Now we have proposed many parallel technologies, such as DWDM, which are some network technologies. What is network technology? I set up an MPLS network. Its forwarding mechanism is based on MPLS. The ATM network looks the same, but it is actually forwarded by ATM source.

6) switch, Layer 2 switching of the LAN.

5, WAN type

1) PSTN (public switch telephone network) public telephone network;

2) ISDN (Integrated services digital network) integrated service digital network;

3) Lsased line: DDN;

4) X.25: defines how to maintain the connection between DTE and DCE for remote terminal access and computer communication on the PDN (Public Data Network);

5) Frame-relay;

6) ATM (asynchronous transfer mode).

Although this information is not an important knowledge point, it is always the foundation of CCNA learning.

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