Obtain CWNP Wireless LAN Certification

The CWNP certification or the Certified Wireless Network Professional is a very prestigious certification and has recently become the global industry standards for wireless LAN technology. It is probably the only one of its kind in the IT industry for providing independent training and certification for wireless networking. Having one such certification in your hands opens new and vast career opportunities to your way. Lately the trend of communication technology is heading for wireless systems and having a CWNP wireless LAN certification not only validates the fact that you are a master in this evolving field of technology but also opens the door to extremely high paying jobs which are not accessible otherwise.

The CWNP Wireless LAN Training and Certification is basically meant to combine the existing networking knowledge with wireless networking protocols. The CWNP wireless LAN certification exam consists of 90 multiple choice questions. The cut off score is 80% which clearly demonstrates that to get this CWNP certification you need to be excellent in the field of networking and wireless technology. The main areas of coverage includes Radio frequency technologies, 802.11 a/b/g RF Transmission, 802.11 WLAN and WWAN Infrastructure as per the wireless industry standards, 802.11 Wireless LAN Operation which is the most common of its type, WLAN Implementation and Management, Troubleshooting and Optimizing 802.11 Networks and the most importantly WLAN security. You have to attend the CWNP training course at LEVER Technology Group PLC training centers where study guides and practice tests are available at discounted price. The types of questions are quite diverse and complex, so proper understanding of the subject is very essential.

Usually the training course if properly followed and executed is sufficient for the exams but the more you practice, more it is better for you. You can also take the virtual online test engine from pass4sure guaranteed to get you through in the very first attempt, failing of which do 100% money refund. Though these sharpen your weak as well as strong points still the ultimate success entirely depends on the labor you put in it.

Juniper AX411 Premium Wireless Access Point is an ideal solution for branch network

One of the difficulties for the company, its subsidiaries with less IT support is the extension of secure system for its branches. After employees technical skills (especially security) in each of the branches lead to structural costs. In modern societies with multiple offices, the integration of the communication system between headquarters and branch offices is a must for business productivity. However, connects the settlements, the have a low-security will only security holes and vulnerabilities to the headquarters and the corporate network as a whole.

One of the shortcomings, the holes on the safety of the branches, the use of the wireless network that is not properly designed with safety. wireless access to corporate data without limiting guests to access the network can provide the security that affect the system. Provide any data encryption for> Wireless communication is very dangerous for the system, the unauthorized users can easily access.

Many network administrators find it difficult to extend the protection of security are well protected from fixed to wireless networks. This is sometimes caused by the difficulty of integration of various networking products from different manufacturers. In addition, the last thing in security operations of the radioNetworks for many network administrators. And 'so the choice of premium wireless access points in wireless networking for remote offices is very important to reduce a compromise safety. The access points available to secure your wired network can be integrated.

Juniper AX411 Wireless LAN Access Point, SRX series is combined with the Juniper would be an ideal solution for branch offices and helps network administratorsManagement and design for both wired and wireless security. AX411 is designed for branch offices of enterprise-class companies. If your home or office SOHO build, you can consider the points cheaper, such as DAP-1522 Wireless-N Access Point from D-Link duo.

Which product is

Juniper AX411 Wireless LAN Access Point is built with the latest technology wireless 802.11n 2x3 MIMO dual-band and providesSpeed up to 300Mbps. With support for dual-band, AX411, the host species of 2.4 GHz and 5 GHz wireless devices based on both.

AX411 is designed to be easily integrated with the award-winning Juniper Branch. This provision allows for centralized management and security levels of the wired network to wireless networks easy. The combination of the AX411 and SRX-series Gateway you can extend the security and Quality of Service (QoS) requirementswireless networks easily.

Juniper AX411 Wireless LAN Access Point supports multiple SSIDs that you separate the security requirements for different user groups, which provide different levels of security access to corporate information, customers without access to the internal network. You can match any offer unique SSID and security with the specific requirements for QoS policies for your enterprise security.

AX411 is designed to support future cluster cloning technologyPoints to networks to facilitate the deployment of multiple access for wireless large. The good thing with the integration of the SRX-series is that the SRX wireless controller provides expertise in the management of up to 2 AX411 Access Point. But, you should run more than two AX411 devices require, you must purchase additional software licenses.

Juniper AX411 Wireless LAN Access Point supports 802.3af Power over Ethernet (PoE) to help install the equipmentin the region where power outlets are like the installations covered. Simply connect the AX411 Gigabit Ethernet LAN with UTP cable to PoE-enabled switch port or a connection with the SRX-Series PoE. AX411 includes the assembly of simple use of the devices in the wall or ceiling desk.

The construction of a wireless network for branch offices, companies must meet strict set of security policy. Low-security projectThe branches are used only to promote security flaws and vulnerabilities of the corporate network. The combination of Juniper AX411 wireless access points and gateways, the SRX-Series is the ideal solution for branch office network.

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Wireless Adpater: Installing, WPA2 and Advanced Features

You will never meet the 108 Mbps wireless router, most have to say that, but to get closer, you're done, buy a wireless adapter for it.

Installing the wireless network adapter

1. Stick your card in the slot on the laptop PCIMICA. Windows XP automatically recognizes the card and ask for the driver. If you have installed the driver, then I recommend you do not find the driver manually by using the manufacturer's qualifiedTo install the driver software.

When you install on your hard disk installed, you must use a number of other crap that you do not need. You install wireless scanning and wireless monitor software, the system will be your only Bogg.

2. You have installed the driver should be able to scan wireless networks. In the bottom right task bar, you see a computer icon with the radio waves coming from it.
It is overMicrosoft Wireless Zero Configuration Utility. This feature is good and bad, is because you try to connect to any wireless network in the area and once you are connected to the network, which, when it becomes available will always try to connect to connect to.

This is bad because if the router to connect to a network called "Linksys" network connection is not secure, since this is the default SSID of the Linksys wireless alll.

The connection to wireless networks candangerous because it could be a hacker Rogue Access Point I have to collect information about you.

3. I suppose you know which network you connect properties to let go, the properties of wireless network card with a double-click the wireless icon in the taskbar and click.

Click the Wireless Networks tab and click Add. Enter your SSID you want. If this is your home wireless network and make sure you change the SSIDbit 'dark and change wireless channel to something other than channel 6

Then you must choose an integrated power supply, the same type of encryption or router of your choice for your wireless. I hope you have WPA2-PSK TKIP or AES chosen.

You may need to upgrade to Microsoft WPA2 support for the installation of Windows XP, click here

You'll know when you install the update because you have not given the option WPA2.

Now typeKey, click OK and you should be able to connect to the network.

Advance Options

Return to your wireless card properties and can look at some options before you. Options vary in name but not in general work.

1. They should be adjusted in the General tab of the wireless adpater properties and click the Configure button next to the name of the WLAN.

2. you can click the Advanced tab (Please note some of these or settingIt is empty notebook battery much faster, but it will improve performance.

3. First you change the channel 11 or the same wireless network. The default channel for most wireless networks is 6

4. You can easily MAC address if you want

5. If you can reduce performance. This will mainly be made for safety reasons at positions maks client, so that hackers do not attack.

6. Do you have a sort of sleep mode, orperformance standards, both to save battery life or focus on performance

7. Roaming options to maximize bytes or away - you're really in a nearby access point and downloading music then you will want to maximize bandwidth. If you are not an access point nearby, then it must change from a distance.

These are just some of the advanced options for the wireless card. Many people do not even know are there.

Time Division Duplex (TDD) vs Frequency Division Duplex (FDD) wireless backhaul

The goal of a wireless network

The convergence of voice, video and data services is the ultimate goal of many providers of communications services. To achieve this goal, technology dominates the traditional fixed voice communication connected with new technologies that will accommodate the bandwidth requirements of today's consumers replaced. Access systems such as Frequency Division Multiple Access (FDMA) and Frequency Division Duplex (FDD), was considered innovative whenapplied first to the needs of the traditional voice network. Today, however, there are other technologies on the market, necessary to implement the demands of high bandwidth and dynamic nature of the current network, voice, video, to provide Internet services and data can actually meet.

FDD and TDD

Frequency Division Duplex (FDD) and Time Division Duplex (TDD) are two most common systems used in duplex broadband fixed wirelessNetworks. FDD, which has historically been used in voice-only applications, it supports two-way radio communications using two different radio stations. TDD uses a single frequency, alternatively, to transmit signals in both downstream and upstream directions.

In point to point fixed wireless systems that use FDD frequency channel is transmitted by radio to a valley on the radio as a second frequency in upstream direction and supports the transmission of radio-BA. Thanks to the pair of radio frequencies is the simultaneous transmission in both directions. To mitigate the interference between transmission and downstream, must be a minimum frequency separation between the pair of frequencies to be taken.

In point to point fixed wireless systems that use TDD, frequency of single channel is a direction to the signals in both downstream and upstream.

Symmetry data

FDD systems use channelThe plans, which includes the frequencies with the same bandwidth. Since each channel has a fixed bandwidth, channel capacity of each frequency is fixed and equal to all other channels in the frequency band. This makes it ideal for communications applications in which the FDD symmetrical identical or similar information flows in both directions, such as voice communications.

TDD works by switching directions of the antennas in a time interval. The routing is done very quicklyand is imperceptible to the user. TDD can support voice and other communications services, symmetric and asymmetric data services. TDD can also handle a dynamic mix of both types of traffic. The relative performance of the upstream and downstream links can be changed in favor of one direction over another. This is done by a greater allocation of time slots obtained in time intervals for transmitting downstream and upstream. This asymmetry is useful for communication processesflow characterized by asymmetric information. An obvious question for this technology is Internet access where a user receives a short message in front of and downstream of large payloads information.

FDD can be used for asymmetric traffic. However, spectrally efficient, the bandwidth of the downstream and upstream channel can be matched precisely to the asymmetry. Since Internet traffic is bursty by nature and the asymmetry is always changing, it is not possible bandwidth of the channelbe set precisely in FDD. In this respect, TDD is more efficient. In addition, the channel bandwidth typically set by the FCC or limited by the capabilities of available devices. As a result, users of the FDD does not have the ability to channel bandwidth varies dynamically in the upstream and downstream.

Spectrum Efficiency

Radio spectrum is an increasingly scarce resource. This scarcity drives the need for optimum use of available bandwidth. FDD systemswork on the principle of paired frequencies. A channel plan is designed, made up of downstream and upstream channels, typically defined by the body, FCC, ITU, or other government. FDD channel set to maintain a guard band between upstream and downstream channels. The guard band is required to avoid self-interference, and because it is not used, essentially wasted spectrum.

In contrast, TDD systems require a guard time (instead of a guard band) between the sending and receiving streams.The Rx / Tx Transition Gap (TTG) is a gap between the downstream and upstream transmission system operator transmission. This gap allows time for switch-mode base station transmission mode and subscribers switching from receive to transmit mode. During this gap, the base station and subscriber transmitting modulated data but are simply the carrier base station transmitter to ramp down, press the TX / RX antenna to pass, and the base station receiver section. Enable

Conclusions

The above discussion has highlighted the differences and some significant advantages of TDD over FDD. These advantages can be summarized as follows:

FDD is an old system that is best for applications such as voice, symmetric traffic, which was suitable to generate, while TDD is especially for burst, asymmetric traffic, such as the Internet or other suitable services to the data.

In TDD, both the transmitter and receiver operate at the same frequency, but differentTimes. Therefore, TDD systems reuse the filters, mixers, frequency sources and synthesizers, making the complexity and cost of isolating the electromagnetic field and the receiving antenna connected. An FDD system uses a duplexer and / or two antennas, the spatial separation and thus require the resources can not be reused. The result is the most expensive hardware.

TDD uses the spectrum more efficiently than FDD. FDD can not be used in environments where the service is notnot enough bandwidth to the guard band required between transmit and receive channels of supply.

FDD TDD is more flexible in meeting the needs of dynamically allocated bandwidth upstream and downstream reconfigure in response to customer needs.

TDD allows interference mitigation through the proper frequency planning. TDD only requires a clear channel with FDD, the two channels without problems requires respect.

In summary, a desirable TDD duplexTechnology that enables network operators to get the most from their investment in equipment and spectrum of telecommunications and the needs of each client.

what kind of wireless network adapter for your best?

In the past, if we all do not plug it in, connect the Internet or the cable is connected to a greater effort than the rest of the wires to the computer. Laptop computers are created and the hills of the strings has been fixed, had to do something to the Internet. With all the other laptops, the cable was only prevents the complete freedom and mobility.

It seems a near-miracle now be able to surf the Internet completely hollow. It was not possiblewithout the design of modern wireless network adapter. Rather than shut up in an office, Internet users now have the freedom to do their work or leisure in nature, or where they want.

Who cares? Built-in radio transmitter and receiver adapter included in each wireless network. Your computer is now able to connect to a wireless LAN and connect to the Internet.

What kind should I buy? When it comes to Purchase a wireless network adapter, you have two options: USB or PCI. The choice depends on the type of computer system in use.

If the computer is a traditional desktop, wireless PCI adapter is the best for you. Add this in committees specifically for your computer and fits in the rest of the hardware. The desktop will have a place to go for the adapter, called the PCI bus.

For a notebook, on the other hand, you need a USB> Wi-Fi adapter. This is to develop, rather than outside inside, and can be easily inserted in the same place you could put the USB flash drive or other development. Do not worry - most notebooks have more USB ports for all your needs.

Another option is to install a wireless network - a feature that many notebooks today. Small chips are already stored in the computer and serve as a network adapter. No additional installation is required.

To check whether your computerexisting wireless networks, click the Start menu and then check the network connections. Another way might seem from the network for everyone is clicking on the group of computers that are located next to the volume and time on the toolbar. A mysterious external switch (turning the wireless on and off) is also a good indicator.

Wireless Router

A router is a type of computer primarily to convey adequately the information programmed. The router operating systems are unique, such as Juniper Networks JUNOS and JUNOS, Extreme Networks XOS or Cisco IOS. Also included are NVRAM, RAM, flash memory, processors and network interfaces.

The wireless router is a wireless network device. It also functions as a wireless access point. It is usually used to connect to Internetand computer network. The routers are operational in the local wired network, wireless local area network only or a combination of wired and wireless local area network.

A wireless network. Set-up for shared Internet access, files, printers and other computer functions of the wireless network is easier to use in offices and homes. You can have access to the Internet and local network connection anywhere in your home or office. Installationconfiguration and it's worth.

The first step in installing the wireless router is choosing the right equipment. The equipment must meet its desired set-up. The equipment should be supportive of the three wireless networking technologies. The three network technologies wireless 802.11a, 802.11b and 802.11g.

A broadband Internet connection is preferable. A computer must have a built-in support network or a wireless networkNetwork adapter. Make sure there is a point wireless router and WLAN. Unplug the modem before connecting the router Internet access. The modem should be connected directly to the Internet. If all devices are connected to each other, wireless router connects to the Internet

Make sure the links on the right are running. There are variations in the labels of connection ports, depending on theModels and manufacturers of wireless routers. These differences in the labeling do not care what is important for the functioning of the devices to the router.

You can now configure your wireless router. The cable network will now serve as a link between your computer and your wireless router. Open your Internet browser and the configuration of the router. The control module of the router, address andPasswords are used.

The Internet browser displays the wireless router's configuration page. You must configure three things unique network user. The first is the name of your wireless network, otherwise known as the SSID. Thus, a network security. The latter may be) in the form of wireless encryption (WEP) and Wi-Fi Protected Access (WPA. an administrative password, which controls the wireless network should alsobe used.

The last step in setting up the wireless router is the connection of the computer. The door of the computer must be connected via the wireless network. It can also be connected to the network adapter via the USB connection through the radio. The on-screen instructions in the user configuration.

Among the leading brands of wireless routers with the router address, username and password are as follows:
3Com or, admin; 192.168.1.1;admin
or D-Link, admin;; 192.168.0.1 password specified
Linksys or admin;; 192.168.1.1 admin
Microsoft or broadband admin;; admin 192.168.2.1
O Netgear, admin;; 192.168.0.1 password
Setting up a wireless router is very simple. Most people prefer wireless router now because buildings are able to work with their computers anywhere.

Wireless Basics

How CCNA Wireless Airwaves candidate should understand how RF signals to send data about employees.

Fundamentals CCNA Wireless.

The wireless LAN IEEE has created a work on a specification that defines how to use the same frequency of half-duplex transmit and receive in addition to a. The specification known as 802.11.

To use the frequencies specified by the IEEE 802.11 standard does not require approval by the userprovided that you shall follow the established rules of the IEEE.

Country or region has a regulatory authority (the FCC in North America and Europe ETSI), which governs the frequencies that can be used each can be used together with the amount of power that the wireless device can be operated and transfer of technology types .

(ETSI is a non-profit Journal. ETSI is responsible for levels of performance standards and frequencies in Europe)

In 1986,North America is the FCC allowed the use of a technology called "spread spectrum" in the commercial market in a band called industrial frequency bands scientific and medical (ISM).

Bandwidth and data rate

The world in which we have data is used to refer to past the word "gang" the amount of data measured on a fixed point in bits per second, kilobits, megabits and Gigabit Ethernet. These use the range limit is not technically correct. The correct term would be"Data Rate".

When talking about bandwidth, we refer to the number of vibrations per second. A cycle is in Hertz. A Hertz measures how many cycles per second. Some examples are to be used in FM radio and TV is about 175kHz 4500Khz would.

electromagnetic spectrum

At extremely low frequency (ELF) 3 Hz to 30 Hz
Super Low Frequency (SLF) 30Hz to 300Hz
Ultra Low Frequency (ULF) 300Hz to 3kHz
Very low frequency (VLF) 3KHz to 30kHz
Low frequency (LF) 30 kHz to 300 kHz
Medium Frequency (MF) 300kHz to 3MHz
High frequency (HF) 3 MHz to 30 MHz
High frequency (VHF) 30 MHz to 300 MHz
Ultra High Frequency (UHF) 300MHz to 3GHz
Super high frequency (SHF) 3GHz to 30GHz
Extremely high frequency (EHF) to 30 GHz 300 GHz

Which frequencies can be used depends on the country you are in Europe, allows the use of 2.4 GHz and 5 GHz, these areas as Cipta A, B, C, bands are known.

2.4Ghz

CEPT A =5,15-5.25 GHz
CEPT B = 5.25 5.35Ghz
C = 5.47 CEPT 5.725Ghz

North America uses Unlicensed National Information Infrastructure (UNII) bands.

900Mhz

2.4 GHz ISM

UNII-1 GHz = 5,15-5.25
5,25-5.35 GHz UNII-2 =
Extended GHz UNII-2 = 5.47 to 5725

900Mhz

Range: 900MHz - 928MHz to 902Mhz Start

For phones without core

2.4Ghz

Use of 802.11, 802.11b, 802.11g, 802.11g and 802.11n

The 2.4 GHz channel is divided intoSub-channels. The number of sub-channels used depends on the country:

Northern = 11 channels, each 22MHz wide channel
ETSI (Europe) = 13 channels, each channel is 22MHz wide
Japan = 14 channels, each 22MHz wide channel

Many of the channels overlap and it is recommended that non-overlapping channels, the three non-overlapping channels are used 1, 6 and 11

5GHz

Used by 802.11a and 802.11n.

For the 802.11a data rates from 6 Mbps to 54 Mbps

The802.11

802.11b specification

= 2.4 GHz frequency spectrum
The technology used HF = DSSS (Direct Sequence Spread Spectrum)
Non-overlapping channels = 1, 6 and 11
DBPSK and DQPSK modulation =
Data rate = 1, 2, 5.5 and 11 Mbit / s
= 11 Barker coding and CCK (Complementary Code Keying)

802.11b is an improvement over the simple, that alone could reach 802.11 data rates of 1 or 2 Mbps 802.11b is designed to be compatible with 802.11 Barker11-encoding where it is necessary, and CCK, when not needed, compatible with 802.11.

802.11b allows customers to dynamically transfer data rates, such as the access point and gain speed as they move closer to the transition to the access point.

802.11g Specification

= 2.4 GHz frequency spectrum
The RF technology used = OFDM (Orthogonal Frequency Division Multiplexing) and DSSS nonoverlapping
Channels = 1, 6 and 11
DBPSK and DQPSK modulation =
Data Rates= 1, 2, 5.5 and 11 Mbps DSSS and 6, 9, 12, 18, 24, 36, 48, 54 Mbps OFDM
= 11 Barker coding and CCK (Complementary Code Keying)

The 802.11g specification allows additional 8 data transfer rate up to 54Mbps more like 802.11a.

802.11g is compatible with 802.11b with identical coding and modulation, but it's only 802.11b, 802.11g and return to negotiate prices if access to the medium after it was broadcast 802.11g data rates of early

You should alwaysKeep in mind that still uses the 2.4 GHz and as such are only three non-overlapping channels 1, 6 and 11

802.11a specification

= 5Ghz frequency spectrum

The RF technology used = OFDM (Orthogonal Frequency Division Multiplexing) and DSSS

Non-overlapping channels = 4 non-overlapping channels per band, the middle eight channels with 52 sub-carriers used on each channel

DBPSK and DQPSK modulation =

Data rate = 1, 2, 5.5 and 11 Mbps DSSS and 6, 9, 12,18, 24, 36, 48, 54 Mbps OFDM

UNII-1 is designed for indoor use, for outdoor use with external antenna and UNII UNII-3 is designed for outdoor decks and external antennas designed.

Four non-overlapping channels per frequency band (each band is or UNII-1 = low, 2 = medium-UNII, UNII-3 = high). Consumers generally use the middle and lower bands. With four not on the lapping channels per band. Each channel of each book series has 52 sub-carriers on each channel

Low-and middle-Channels in a total of eight channels each 20Mhz, 20Mhz each of these channels are divided and then divided into 52 sub-carriers of 300kHz.

ETSI allows the use of 19 channels with support for dynamic control of frequency to avoid interfering with radar, which also takes the same bandwidth.

802.11a also encourage the use of Transmit Power Control as not to disturb even the radar.