Senin, 30 Januari 2012

Why Oracle Certification is Necessary and Who Needs It?

Who Needs an Oracle Certification and Why?

Today, IT specialists have become an integral element of many business set-ups. But it is important to remember that this is a fast moving industry. That is why it is vital for all IT professionals to keep up-to-date with the most recent innovations and developments in both hardware and software. It is only by having a thorough understanding of the latest skills and knowledge that those working within information technology can remain competitive. Without it, employers will look elsewhere, instead seeking out those who can prove they have the necessary levels of competence.

That is where Oracle certification comes in. As an internationally recognized program, Oracle certification demonstrates that an IT specialist has the relevant expertise. It acts as a badge of integrity, validating someone�s capability within the field of information technology.


When is an Oracle Certification Necessary?

So who, exactly, needs an Oracle Certification? Firstly, if you work within the IT profession, you need to ensure you stick out from the crowd. Competition can be fierce, and you must remain at the forefront of your field if you are going to be noticed by employers. Having an Oracle certification under your belt will enable you to set yourself apart from other IT specialists, as you will have the advantage of an industry-recognized qualification that signifies your proficiency.

On the flip side, if you are an employer searching for an IT expert to join your team, you need to feel confident that you have chosen the right candidate. By selecting someone with Oracle certification, you can rest assured that your employee has the level of skill that will ultimately benefit your business.

Alternatively, you may wish to provide your existing staff with additional IT training. Allowing your workforce to obtain an Oracle certification will give them the chance to learn and develop new skills, which in turn can be reinvested back into your company. It also shows your commitment both to the success of your company and to your employees, garnering a greater sense of loyalty and dedication which, in turn, is also beneficial to the overall success of your operation.

Importance of Oracle Certification Program:

If you wish to work towards an Oracle certification, you must first decide which certification path to follow. There are a variety of disciplines on offer, including database, Java and middleware, applications and server and storage systems. When you have identified which option will complement your requirements, you can prepare for your exams in whatever way suits you best. Whether it is instructor-led training or accessing online resources, you will benefit from a wide range of guidance and instruction. After you pass your exams, you will be sent an Oracle certification program success kit, officially declaring your IT abilities.

Once a basic foundation of skill has been attained, you can continue to progress by upgrading your certification path. There are three grades of Oracle certification, which are: Oracle Certified Associate (OCA), Oracle Certified Professional (OCP) and Oracle Certified Master (OCM). This tiered system offers you the chance to improve upon your current level of qualification, giving you the opportunity to grow within the IT marketplace and continually improve both your ability to work within this competitive industry and your own continuous personal development as an IT specialist.

Sabtu, 28 Januari 2012

Artikel Panduan Wireless LAN (WLAN)

Wireless LAN (WLAN)

Pada dasarnya Wireless LAN (WLAN) memiliki kesamaan dengan jaringan yang menggunakan Ethernet card, perbedaan utama hanya pada media transmisinya, yaitu melalui udara dengan menggunakan gelombang radio.

Access Point (AP) pada WLAN memiliki fungsi yang mirip dengan hub/switch. Pada menggunakan AP, peralatan wireless hanya dapat berkomunikasi secara point to point saja. Dalam jaringan yang menggunakan kabel disebut cross link sedangkan pada wireless istilah point to point biasa disebut ad-hoc.

Dalam sebuah sistem WLAN, access point akan mengeluarkan sinyal (code) SSID (Service Set Identification) dalam radius tertentu. Agar semua komputer yang masih dalam jangkauan access point dapat terhubung di dalam jaringan wireless tersebut, masing- masing komputer harus mengisi SSID yang sama seperti pada access point.

Selain SSID, untuk mencapai keamanan yang lebih tinggi, semua perangkat wireless
telah dilengkapi dengan fitur keamanan seperti MAC (Medium Access Control) address, WEP (Wired Equivalent Privacy), dan lain-lain. Tujuan dari fitur-fitur diatas adalah untuk membatasi koneksi, sehingga tidak semua orang dapat terkoneksi dengan access point.

WLAN diatur oleh lembaga IEEE berdasarkan spesifikasi 802.11, berikut ini beberapa protokol pada WLAN:

802.11b
Digunakan mulai akhir tahun 1999 dengan menggunakan frekuensi 2,4 Ghz. Maksimum bandwidth yang bisa dicapai adalah 11Mbps (Megabit per second). Pada koneksi ini, modulasi yang digunakan adalah DSSS (Direct Sequence Spread Spectrum). Kanal yang tidak overlapping berjumlah 3, yaitu kanal 1, kanal 6 dan kanal 11. Protokol ini
kompatibel dengan tipe 802.11g jika tipe 802.11g beroperasi pada mode mixed.

802.11a
Digunakan mulai akhir 2001 dengan menggunakan frekuensi 5Ghz. Maksimum bandwidth yang bisa dicapai sebesar 54Mbps sementara modulasi sinyal yang digunakan adalah OFDM (Orthogonal Frequency Division Multiplexing). Kanal yang tidak overlapping berjumlah 12 (bisa lebih). T ipe ini tidak kompatibel denga tipe b maupun g.

802.11g
Digunakan mulai pertengahan tahun 2003 dengan menggunakan frekuensi 2,4Ghz. Maksimum bandwidth yang bisa dicapai sebesar 54Mbps. Modulasi yang dighunakan adalah OFDM. Kanal yang tidak overlapping berjumlah 3 buah. Protokol ini kompatibel dengan tipe b namun hasilnya mengikuti tipe b.

802.11a/g
Tipe protokol ini mulai diperkenalkan pertengahan 2003 dengan menggunakan frekuensi 2,4 Ghz dan 5Ghz. Maksimum bandwidth yang bisa dicapai sebesar 54Mbps
dengan menggunakan modulasi sinyal OFDM. Kanal yang tidak overlapping berjumlah
16 buah. Bila beroperasi pada modus a, maka protokol ini tidak kompatibel dengan tipe
b dan g. Namun , jika beroperasi pada modus g, koneksinya akan kompatibel dengan tipe b.

I �6i y 0�^ 8�Q "sans-serif";letter-spacing:-.55pt'> dengan tipe b.