All Explanations of CompTIA Network+ : part two

3. Exam. As for CompTIA N10-004, all kinds of certificate exams are computer-based so the examinees could know their exam results just after the exam. Test results will be uploaded by the test center back to the test company's central server at the end of everyday's test, and processed test results will be sent by the test company to the IT company who has commissioned this test to decide whether to grant certificates or not. Because it adopts the internet-based test, and the result could be acquired immediately, so the subjects are all objective items, 80% of them are choice questions. Other kinds of questions are dragging the title (that is to drag the selected answer to a certain location), fill-in (mainly some simple commands, such as Cisco's IOS command), simulated operation (such as the emergence of a IIS in the MMC control interface, given some of the requirements of actual operation) There are a number of topics, such as CASE STUDY (ie, initially for a long period of CASE's account, and then according to the CASE answer more than 10 multi-choice questions).

N10-004 test item pool is provided and maintained by the company itself who has commissioned the test, and who should also provide assessment criteria and testing strategies. At the beginning of each exam you must answer questions such as "your income," "the nature of your work," "who pays the exam for you " and other issues then you can begin a formal examination. These questions have nothing to do with the examination, just help the IT companies know more about the personnel structure of candidates, so give the solid answers is all you need to do. However, there is also time limit for answering these questions and they are all choice questions, which is like a formal exam, and usually makes the friends taking CompTIA certification exam for the first time feel confused.

Would like to remind everyone that, in determining the IT certification exam before, we must understand that in the IT field without any kind of certification is the IT industry, "one size fits all." Because of requirements of IT industry's own characteristics, its division of labor is very refine, for example there are various different areas like internet, office software applications, software development, computer installation and maintenance, databases, graphics, image processing and so on. And with the development of the IT industry, new areas will continue to appear, new certifications will also emerge, and the old certifications will be updated constantly. If the applicant wants to enter one field in IT industry, he should try to acquire the certification in the field, even if the hot CompTIA Network+ certification is not almighty. Therefore, when participating in training and examinations we must be targeted towards the most authoritative and up-authentication certificate, to get a golden key to enter the IT industry.

Moreover, people are free to choose their own certification exams, but we must understand the market-oriented field and gold content of the certificate, and then participate. We should not follow the majority. Most importantly, you should choose the certificate on the base of your specialty and development orientation. For instance, if you are interested in network and hope to become a network administrator, you could choose the certificates of MCP of Microsoft, CNE of MCSE and NOEII, MCNE and SCJP of Sun Company. If you are good at the data base, you can take in the exams of MCDBA of Microsoft company or the relevant certification exams of data base of Oracle?Sybase?IBM companies. In addition, there are a number of certification exams on the graphic image now, people who likes graphic design, web-page can consider them.

Relate Exam:

Mobile Power What is this?

1, concepts:

Mobile Power, also known as "plug-in battery," "external battery," "back-up battery," "Digital charge partner", also have their own personalized product name from "mobile phone lovers," the concept of portable power with the current the popularity of digital products and rapid growth in developed, and its definition is a convenient easy to carry large-capacity portable power supply. Growing diversity of the current digital product features, use was also more frequent, how to improve the use of digital products the time to play its most important function of the problem highlighted important. Mobile power, that is targeted and the best solution to solve this problem. Has a power supply, we can move anywhere in the state to provide electrical power for a variety of digital products (electricity, or charge).

2, features: mobility, versatility,

Mobile power mobility refers to the product in the mobile state (such as travel, meetings, charger is not around or inconvenient recharge conditions) to play its role, that is anywhere, anytime without limitation to power or charge for digital products and truly give a practical sense, so that the quality of life and work can be improved.

The universal mobile power products can mean for the widest range of digital products. Namely, portable power to mobile phones, MP3, MP4, PDA, PSP, Bluetooth headsets, digital cameras, CD players, video machines, digital cameras, portable DVD, portable computers and other digital products and services. In fact, not only that, mobile power through the usb cable can be used in any eligible USB On-the-Go (USB-OTG) of the portable device (usb lamp, usb eye massager, usb electric coffee maker, etc., etc.), the The most convenient as a mobile power supply.

3, use:

Mobile power is usually designed for lightweight, compact, easy to carry, to facilitate mobile use. Charger for portable power, after fully charged (typically design full time for 3-5 hours), with the appropriate connector to connect your digital devices or directly with the usb cable to connect USB On-the-Go (USB-OTG) portable type equipment, mobile power switch after auto-detection or simple start to your digital devices, power or recharge.

4 Notes

The use of mobile power products, need to pay attention to two issues, one, mobile power supply output voltage must be within 5.3 ± 0.5V, unless to some brands charge their cell phones; 2, transit connectors must match, mobile power products, The principle is used to connect via USB cable to charge digital devices, connect one end of cable with a USB interface to connect mobile power products, while the other end of the digital equipment, so the other side of the interface must be consistent with the interface of digital devices, or can not be charged.

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How to improve the mouse sensitivity

If it is optical mouse, then there are two ways to enhance his sensitivity:

(1) optical mouse apart, the positioning of the optical mouse optical components (that is, that luminous Dongdong) a cigarette filter in the filter cotton gently wipe a certain degree to do with.

(2) the replacement of a mouse pad, it is recommended to use coarse glass or light rat-specific mouse pad, if the money so you can buy a CS-specific mouse pad. (Note that the optical mouse with a computer cable must not be over-squeeze, that would result in poor transmission will also affect the speed.)

If the wheel, you can try will be sitting at the end of the mouse wheel removed to clean the surface of the wheel, in contact with the wheel roller to clean and will continue to clean the surface dirt can improve sensitivity. Open the mouse cover (there are two structures: the edge card screws or tongue), and inserts the case back bowls, a total of three rollers, carefully clean (clay, fiber, etc.), toggle and flexible, you can of the . In addition, two of them with a tooth, is facing the laser beam passing through them to see Do not touch shape. Every month or every other weeks of the mouse you can clean up on a regular basis to keep it smooth and fluid movement.

USB interface, the mouse on the CPU occupancy ratio PS / 2 mouse interface, large (when the system CPU-relatively large, the mouse makes you feel it a bit unstable). But you can use the following steps to adjust the performance of USB mouse. Right-click My Computer ? Properties ? Device Manager (in Windows 2000, we must first select the "hardware" tab). In the Device Manager find the "Universal Serial Bus Control", and then select the bottom USB Root Hub devices, such as VIA Tech 3038 PCI to USB Universal Host Controller. Open it and then select the "Advanced" and will "Disable USB error detection" box in front of Da Shanggou finally restart the system on it. This can significantly improve the USB mouse and other USB devices on the system response sensitivity.

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Cisco certification and eliminating
  1. Q: say Cisco certification is a valuable, any value?

A: The web application has spread to every corner of the world. In order to ensure a reasonable network design, implementation and maintenance, require large amounts of network technicians. How should we measure the technical staff level? To this end the company has launched a certification program. www.test99.c as the world's largest supplier of ---- Cisco networking products company, launched in 1993, billed as the world's most valuable certification ---- Cisco career certification program. One reason is that the value of Cisco networking products most widely used, partly because of its certification program a comprehensive, practical, standards and authority of the technical content of the certification program by no means limited to Cisco networking products, thereby gaining the most extensive and with general approval.
2. Q: Why does everyone from the CCNA to start?

A: Let us look at the Cisco career certification program certification in two ways:
1, after-sales engineer certification, also known as network support categories, including CCNA -> CCNP -> CCIE three kinds of certificates. www.test99. 2, pre-sales engineer certification, also known as network design categories, including CCDA -> CCNA -> CCDP three kinds of certificates. www.test99.co these two channels, after-sales engineers, certification requirements and applications become more popular. At the same time, both want to get CCNP or CCDP certification, the premise is the first to obtain CCNA certification. While access to CCIE certification is not required to obtain CCNP certification, but the CCIE exam is extremely difficult, the costs are very high, so most people are actually taking CCNA -> CCNP, further consider the final sprint CCIE.
As can be seen, CCNA is to obtain Cisco certification.
3. Q: What can brief you on how to obtain the Cisco Certified do?

A: Now, obtain a Cisco certification There are two main ways: one is self-taught, and then take the exam; the other is to participate in training, and then obtain a certificate examinations.
Through self-study, and then obtain a certificate exams, requiring a certain degree of technical base or technical background, but also has a strong self-learning ability. Shortcomings of this approach is: there is no experimental opportunities, ability to make yourself strong, it is difficult competent practical work. In addition, the self-study can not be systematically, comprehensively and quickly improve their skillsCisco 642-642. So we can find a better way to still attend the training.
4. Q: How to choose training center?
A: Cisco now offers a lot of training in training centers, but at varied levels, the choice of training centers, when do have to be careful, the key is to choose their own training center.
Cisco career certification program of training are senior professional training, strength training centers, teachers, laboratory equipment requirements are relatively high. Required in the standard course time (usually 5 Tianyi course) very well done teaching, teachers have very high teaching experience and ability, at least two set of test equipment.
The recent period, the market's increased demand for CCNA certification, leading to many companies set up Cisco training courses. Some training centers cheap to buy some other companies out of old equipment, many of which Cisco equipment companies have stopped production, there is no guarantee of quality, and some experiments I could do. Some companies do not have full-time teachers, teaching hours from other companies to employ temporary teachers, the quality of teaching is not guaranteed.
So, since everyone to participate in training, the choice of training centers, they must be careful to not only look at price, more importantly, teachers, laboratory equipment, environment, management and other factors.
5. Q: I have the ability to participate in Cisco CCNA training and certification do?

A: Cisco's CCNA curricula, it is quite simple. But it also requires a certain basic knowledge, such as the basics of networking, such as: ISO's OSI reference model for the understanding, TCP / IP protocols. If we do not have confidence on the basis of their own, can go to Galaxy training center, the communication with teachers and to test, so you'll have at the end of the.
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CCNA Exam combat skills
The most common test to the examination center:
(A) OSI seven-story structure system: it is necessary to know the role of each layer, a variety of applications, as well as all belonging to that level when the data flow through each layer (from top to bottom, bottom-up) plus HERDER and unpacking of .
(B) Frame Relay (FRAMERELAY) Application: CCNA certification exam as the Frame Relay Wide Area Network (WAN) part of the test content. You will encounter a large number of the test are the contents of frame relay. Therefore, you must be prepared to pay particular attention to the frame relay learning.
(3) ISDN issues: to know, such as TE-1, TE-2, NT-1, U interface (U-INTERFACE), B-CHANNAL, D-CHANNAL and a number of sub-channel (SUB-CHANNAL) and other terms (ISDN related to a particularly large number of terms and abbreviations, you must know the meaning and function of each), to understand the difference between BRI and PRI.
(D) clear AccessList: Learn DenyAccesslist of the inflow and outflow data flow constraints, the implied meaning of a clear DENYALL. Able to skillfully set limits by the subnet mask of the sub-network users.
(5) Ethernet switching: Familiar with Ethernet switch and exchange theory to understand the network sub-domains of conflict theory and VLAN.
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IT certification of sentiment: the certificate and ability in the end who is more important?
Certification is very important? Some say: "That, of course, is not how to prove their level of certification?" Others say: "not necessarily the actual capacity of the most important."
Both answers are probably right, but incomplete. On this topic, I would talk about according to their own learning experiences and understanding of the views of the certification, for your reference:
1, the certificate of true and false
Broadly speaking, at this stage of employment, the certificate is still important, the certificate is the ability to abstract reflection of the learning process and results proved that without the certificate, you can not prove that! Maybe you really are strong, no matter how good you say , others my heart I will not see you too, Just think, one holding a high school graduation certificate and a master's degree candidates graduate student to work with a technology-based, others more fancy Who? certificate must exist a certain historical period , we can not deny the importance of the certificate, as the same as university diplomas issued by the State Education Commission.
Certification is narrow, such as network technologies such as professional certification such as MCSE, CCIE, CCNP, etc., we must be clear what brought about such a certification, what? From the firm's point of view, is undoubtedly of interest to maximize the introduction of Networking Academy, training, certification bodies, the most basic intention of these strategies is to simply promote the visibility of their products and expand market size, when they come out from the university college students who served as XX in the XX business office, business, once there is demand, his first thought was XX vendor network products (of course, rule out other external factors, complete departure from the individual's original idea), he became the most powerful factory sales. Up from a personal point of view is that no doubt would like to improve their technical level, while increasing income to improve their living conditions for themselves to find a satisfactory job! Revenue base, naturally do not have to say much more. However, our technology is to improve it? On the surface, yes! You say that CCIE and CCNA, which enhanced technical capabilities? Needless to say: CCIE! But the CCIE network technology is really an expert? I see not, especially now, the examination of water I do not have to say, we all know. As long as the network technology have a certain interest in the same time, the people will be willing to spend IE! Our company had a brother, I took the test three times, only narrowly passed, it took two to three thousand dollars, even more unfortunately, are getting the dream of a certificate of employment on the road is not so bon voyage. The most important thing is do not forget, we are on the application of network technology, not development, is to put other people's ideas by practical application of the physical environment go! You heard, driving F-22 pilots flying specialists? Maybe he is the future, but as long to open the aircraft, there is no person that he is an expert. Most people who go into space called the astronauts. Designed by others a knock on the side of the command to re-engineer, at most, to know the structure and forwarding packets principle one could call specialists? Some far-fetched. Cisco 642-436
At the same time, the network application is from a single business model to a multi-business model to expand, has just passed Routing & Switching CCIE's brother
Brother, do you understand speech? Do you understand the media? Do you understand safe? You know Unix, Linux, Oracle do? Do not know!, But users have such a demand, how should I do? Learn ?. Do not think they have been practicing to the highest state of network technology, we need to learn many things in too much.
2, capacity is the most important
On this topic, I can give an example to explain that in 2000 I passed the HCSE, but to get the certificate the first 6 days, I went to do a special CISCO systems integrator, to work the first day, to the company's bench has not yet firmly secured, the boss sent me sent to a company, said it was exactly one item, very anxious to be resolved quickly. I am also a person to go. Really, really do not mind the end of that time, the heart speak, is over, not even familiar with the products, no chance! That's no way Yeah, bite the bullet and boarded the plane.
Who knows to which see, I dumbfounded, almost no paralysis continues, routers, switches, self-suffice it to say, there are seven sets PIX firewall, a lot of wireless AP, IP phone, what is there ... .... Do not say these things I've seen have not even heard of hearing. How to do this time? Tell customers that I Gaobu Ding? Called the boss that I learned just routing switching, the other could not find? Can you? Can not. So what do, do it! I have a little calm and a bit and become a deep breath and began to examine the user the current network conditions, ask customer demand, which know the trouble is still behind the demand of customers is simply too much: the headquarters and other Division through firewalls VPN, through the GRE tunnel using the OSPF routing protocol to achieve dynamic routing at the same time to enable IPsec to encrypt data, wireless AP on the division of VLAN, IP phones and PSTN interworking ... ... I Kuangyun!
I carefully write notes to the existing network equipment configuration Copy down the new device model, name written down. Back to the hotel looked just write something really very complicated, finally sorted out the structured. But time is pressing, I can not neglect, drill into the interconnect line, crazy look for materials, to find documents, in conjunction with their theoretical knowledge, sorting out the project implementation plan! Behind the things that is not to say, the natural hardships and difficulty, in the not solve the problem, I always sky nonsense, but always saved the day. Half a month later, the project finally completed! Customer satisfaction survey form filled out is: very satisfied. Acceptance of course, no problem (of course also have my Huyou effort, ha ha), but I have physically and mentally exhausted, I am thin. To get acceptance in the report, I was lying in bed in the hotel a myriad of thoughts: I have the certification exam brought me what? An easy? No, just a learning opportunity.
Said here, some would say: If you do not have the certificate, others do not give you the opportunity to learn! Yes, but it is also precisely that question: the certificate is only recruited to work in your work the moment, other times worthless! certification exam that manufacturers not important, it is important you do not really understand the technology, can solve the problem.
Today I have learned a lot of things other than certification. In addition, the network technology is moving towards international standardization, each device manufacturers must comply with these standards! So for us to seriously study the technology is the most important of these standards, rather than blindly pursuing the vendor certification .
For access to a manufacturer-certified engineers, you can not exclude other manufacturers of equipment, for example, you are xx-certified engineer, if you are CISCO network equipment such as a world-class manufacturing things will not use, would not be too sorry it? If you are a CISCO certified engineer, much less supercilious.
Another point worthy of our attention has been the proliferation of network technology certification, many college graduates have gotten into the certified tide of years, is bound to result in supply exceeding demand in one day, so many people crowded into a corridor go rush of a share, then we have a value? So, I advise those brothers and sisters in computer science, network technology, certification of other professional people that there should be considered a shortcut, but not necessarily for you, and should strengthen the basic knowledge of learning, improve thinking, such as learning the language as far as possible to engage in the development, can not go to test, what kind of certification is needed. The pressure of employment, a positive hit our generation, those who wanted to test certification exam has not yet, or are being test, and ask you to consider carefully, certification, after he was in the end give you what?

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CiscoCertifiedDesignAssociate

Certification of basic skills
CCDA certified personal networks of primary level of design technology. CCDA who pass the exam receive certification and can be caught using business cards CCDA tag.
CCDA is divided into a chunk:
? routing and switching Pass4sure 640-821
In order to help examinees prepare for the exam, Cisco Partners in Learning provides the following services:
• Instructor lectures and online training
• Online Forum
• via the Internet, a remote laboratory experiments practical ability to improve other information can be found in the Cisco Learning bookstores.
Note: You can directly participate in CCDA certification examination and obtain a certificate
CCDA Certification Benefits
To sum up, Cisco certification can confirm the level of the certificate holder, by certified high level of expertise to enhance the credibility of their professional authority. CCDA certification is mainly to meet the less than 500 nodes in a simple SOHO market needs and have a simple LAN, routed WAN, switched LAN network of medium-sized companies need to design knowledge.
CCDA professional skills
• decided to customer network implementation, security, capacity and scalability requirements
• designed to meet customer demand network architecture
• the advantages of the design to meet customer needs
• develop and test a prototype network in order to ensure that the design and provide convincing evidence of customer satisfaction
CCDA positions include:
• Primary Network Design Engineer
• Junior System Engineer
• Cisco's sales channel partners, senior sales representative
The road leading to CCDA Certification
1. Meet the prerequisite for the Cisco Certified Network Design (DCN) is designed to prepare candidates for the CCDA teaching materials. Courses can be found in the study site, description, and curriculum objectives.
2. Determine your learning needs necessary for the study and a prerequisite for DCN
3. Self-study and lay the basis for studying the site in bookstores to buy Cisco Learning Connection Cisco Training CD (ITM CD), to be familiar with terminology, protocols and equipment
4. Online training and instructor training to develop skills to understand instruction DCN's online training and mentoring classes, and to choose your method of teaching can be found in the study site to be a Cisco Learning Partner-related services
5. DCN exam to participate in the site can be found in the relevant certification exam information, you can register online to participate in a safe environment simulation test. Elderly persons who pass the exam receive CCDA certificate and be able to use business cards CCDA tag. If you want to know more about , you can login :

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Cisco Certification Study Notes 1
Chapter 1 Troubleshooting Methods
    First, the complexity of the network
    General network, including routing, dial-up, switching, video, WAN (ISDN, Frame Relay, ATM, ...), LAN, VLAN, ...
    2, fault handling model
    1, define the problem (Define the Problem)
    Detailed and precise description of failure symptoms and potential causes
    2, collecting detailed information (Gather Facts) R> source of information: the key to user, network management systems, router / switch
1) identify the symptoms:
    2) to reproduce the failure: validation failure still exists
    3) to investigate failure Frequency:
    4) to determine the scope of failure: There are three ways to establish the scope of failure
    a from the outside to inside Fault Handling (Outside-In Troubleshooting): usually applied to multiple hosts can not connect to a server or server set
    b from the inside to the outside Troubleshooting (Inside-Out Troubleshooting):
    c half-point Fault Handling (Divide-by-Half Troubleshooting)
 3, consider the possible cases (Consider Possibilities) caused by failure to consider the possible reasons for
 4, establish a plan of action (Create the Action Plan)
 5, the deployment of action plans (Implement the Action Plan)
Used to correct the causes of network failure. Department as the source from the most trouble, and come up with ways to complete each step, check whether the failure to resolve
6, observe the action plan to implement the results of (Observe Results)
    7, where action plans can not solve the problem, repeat the above procedure (Iterate as Needed)
    3, record changes made to
    The adoption of action plans to address the problem, suggested that record as part of the fault handling, record all the configuration changes.

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