Is it necessary to learn CCNA?

CCNA certification (CCNA – Cisco Network Installation and Support Engineer) (Cisco Certified Network Associate) is the initial certification of the entire Cisco certification system. As a result, many people think that since the CCNA is the simplest. Is there any need to learn CCNA? What benefits can CCNA bring to yourself?

1. First, what is the purpose of your Cisco certification?

If you only think of the backrest exam database to get CCNA certificate, then there is no need to learn CCNA. There is no point in learning what to learn. CCNA must learn. Because CCNA is the most basic knowledge of Cisco certification, the basics are not willing to learn. What are you talking about? Only by learning CCNA can we go further and further along the path of IT.

As for a lot of people who asked, “Can we not consider CCNA and consider CCNP directly?”
Regarding the issue of “Can you directly consider CCNP?”, it is not possible according to Cisco’s regulations. CCNP must pass CCNA first, but CCIE can directly examine it.

2. What does CCNA certification represent?

The CCNA certification marks the acquirer’s ability to install, configure, and run medium-sized routing and switching networks, as well as troubleshooting. CCNA-accredited professionals have the appropriate knowledge and skills to establish connections with remote sites over the WAN, eliminate basic security threats, and understand wireless network access requirements.

It is the simplest and most basic CCNA. In terms of detail, it still needs to master more technical capabilities. And these technical capabilities can indeed solve many problems and are very practical.

3, training on CCNA certification

CCNA certification is an entry-level certification for Cisco’s after-sales engineer certification system. Through CCNA, you can prove that you have mastered the basic knowledge of the network and can initially install, configure, and operate Cisco routers, switches, and simple LANs and WANs. CCNA certification indicates that the certified personnel have the basic technology and related knowledge for networking in the Small Office/Home Office (SOHO) market. CCNA-certified professionals can install, configure, and run LAN, WAN, and dial-up access services on small networks (below 100 or 100 nodes). Protocols that they can use include (but are not limited to) IP, IGRP, OSPF, EIGRP, IPX, Serial, Apple, Talk, Frame Relay, IP RIP, VLAN RIP, Ethernet, Access Lists.

4, the value of CCNA certification

After the network system engineer certification training is over, you want to enter the position of a well-known foreign company as a system engineer. CCNA naturally becomes the capital for your job search. Having a CCNA certification will not only reduce the barriers for you to find a job, but also increase your chances of work. In particular, there will be satisfactory adjustments in terms of salary and benefits; and, before passing the CCNA exam certification Professional skills training, but also a more thorough understanding of Cisco’s new technology, has the ability to use and maintain Cisco’s network infrastructure equipment.

5, on the validity of CCNA certification

The CCNA certificate is valid for 3 years. After 3 years, it is required to take the Recertification exam. Of course, if you have obtained a higher level of Cisco certification in the past 3 years, the validity period of CCNA certification is automatically updated. After the CCNA re-certification exam expires, it must take the 640-822 ICND exam, or participate in any of the CCNP, CCDP, CCIP, CCSP exams, or any of the Cisco Qualified Specialists, the prefix is 642 -XXX exam. To re-certify, you must pass an existing CCNA exam, or pass the ICND exam, or pass any of the 642 Professional Level or Cisco Qualified Professional Exams (excluding the Sales Specialist Exam), or pass an existing CCIE written exam.

Does CCNA have any use? What are the benefits of learning CCNA?

It is of course useful to learn CCNA. Of course, you can’t just think about getting a CCNA certificate. Learn CCNA to find work will have priority, you go to Zhaolian recruitment in the keyword input CCNA, you will find that many companies have asked for CCNA certificate priority. But you can’t learn CCNA for a certificate. What’s more important is to really master the technology, learn the real thing and then hold a certificate. This is the most correct! Moreover, there are certificates, technology is good, and finding jobs is naturally more effective!

If you are a web professional, you need to go to the exam. I was studying network majors. My teachers all went to test, not to mention that we were students. Moreover, CCNP is a prerequisite for CCNA examination. Even if CCNA can be considered without CCNA, it is very difficult, unless you already have basic CCNA capabilities. Therefore, the most important thing to learn is to be down-to-earth and not to be eager to seek success so that we can go further.

At the moment, many people say CCNA is useless? Why do you say that?

Because there is too much paper at the moment. What do you mean? Most of the current CCNA people have passed the exam bank and have no real technical level. What is the use of such a CCNA?

So if you are someone who really has CCNA skills, you can say that you are much stronger than those of CCNP’s paper. After reading this article, are you still considering the need to learn CCNA?  If you want to test Cisco tests by yourself, please follow the list:

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Cisco CCNA Basics Learning: An Overview of Internet Concepts

Speaking of the basic knowledge of Cisco CCNA, in addition to the conceptual, the natural non-Internet concept is none other than! The basic knowledge determines the superstructure, so everyone must pay enough attention to these basic knowledge! Let’s take a closer look at the concept of the Internet.

1, define the network formation

First of all, we assume there are four points: company headquarters, company divisions, home office, and mobile office. The company’s headquarters must all be linked to the other three parties. There are two architectures to choose from at this time:

The first kind: Connect through the special line

The headquarters of the company and each of the other three parties have a dedicated line connection. The exchange of information between the other three parties is handled through the company’s headquarters. This structure has a very obvious drawback: If the network at the company’s headquarters is collapsed, then the information exchange between the other three parties and the company’s headquarters and other three parties will be paralyzed!

Second: Connect via the Internet

This method will not have the disadvantage of a dedicated connection. Even if the network at the company’s headquarters is down, the other three parties can still communicate with each other. The meeting meets and the information is shared. Of course, this method also has a relatively obvious drawback: the security of data resources is not high, and the stability of the network connection is not high.

2. Hierarchical network structure definition

for example:

If we have many PCs, to connect these multiple PCs, we can use switches to connect.

Assume that Switch A is connected to a network called Network A; Switch B is also connected to a network called Network B. A and B’s network address is different! How can I connect A network and B network? Connecting two different networks requires a router!

Then we will find that in fact the distribution layer is the router!

If we just connect the two networks, we can connect the routers directly. It’s easy to implement! What if we have thousands of such small networks? At this time, we need a “core layer” to connect all these networks to the core layer!

Say the detail is like this:

Access layer: Devices on access terminals (PCs, mobile phones, TVs, etc.) are access layer devices. For example: The access to the PC is the switch.

Distribution layer: also called the convergence layer. That is, we aggregate all the access to one point and form a network.

For example, if there are multiple rooms, the network of our room is connected through the switch. So where do we gather?

We should converge to the building switch (or router)! The building will have a special device for attaching a line to each room. Each room is plugged into a switch and each line is connected to each PC. Then the building is called the convergence layer. In each room is the access layer. Where is the core layer? The first floor of the engine room.

In fact, when we do strategies, we generally do it at the distribution level. Some people may ask: Why not do it at the core level?

As we all know, the forwarding capability of the core layer is very strong, and the forwarding task is naturally high. Since the forwarding amount of the core layer is already very large, it is not very good to share more memory and CPU to handle those devices.

In conclusion:

Access layer features: access points that terminate devices to the network;

Characteristics of the convergence layer: access point of the access layer; routing data; split broadcast domain/multicast domain; media conversion; security; access point for remote access;

Core layer: High-speed data transmission but no data processing.

3. What are the advantages of network layering?

1) Each layer is independent of each other and divides network operations into low-complexity units;

2), good flexibility! Changes in one layer do not affect other layers. Designers can concentrate on designing and developing module functions.

3) Promote standardization work;

4) Define a standard interface for plug-and-play compatibility to make the network easy to maintain and implement.

4, universal knowledge points: What are the standardization organizations?

What is a standardization organization? In short, it is written agreements, rules, standards.

Standard Edition organizations mainly include: ISO: OSI (open system interconnection); IEEE: 802-series specification protocols (most common); ANSI; EIA/TIA.  If you want to test ccna tests by yourself, please follow the list:

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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.


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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