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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