With cloud computing, user can perform routine computer tasks anywhere, at any time, without installing applications on the local computer. All users need a computer connected to the internet (or public Internet as the case may be) and a compatible application (say, a browser) running on the computer.

How Cloud computing works: Cloud means a grid of computing machines that deliver the solution to the customer. Most websites and server-based applications run on particular computers or servers. The applications are stored on these cloud platforms and accessed by the user without knowing specific server configurations.

Types of cloud computing: Based on where the cloud is hosted also referred as Cloud computing Deployment models:

Public Cloud: This is standard computing model. The computing infrastructure can be shared among several people or organizations with similar requirements. The user need not worry about the stability or up-time of a specific machine in the cloud-computing infrastructure and it is transparent to the user. Several public cloud services offered free of charge to Internet users and discussed in the article.

Private Cloud: Computing architecture is dedicated to the customer and is not shared with other organizations and managed internally or by a third-party. A private cloud may be hosted internally or externally. They are expensive and are considered more secure than Public Clouds.  RackSpace cloud computing is among the first to introduce cloud computing, and is widely used by many organizations due to robust and effective security mechanism that comes with their service.

Community Cloud: Community cloud shares infrastructure between several organizations from a specific community with common concerns (security, compliance, jurisdiction, etc.). A Community cloud may be hosted and managed managed internally or by a third-party. The costs are borne by several organizations, thus reducing the running cost significantly and providing better security and resources compared with a Public cloud.

Hybrid Cloud: Hybrid cloud is a combination of two or more clouds (private, community, or public) that remain unique entities but are bound together, offering the benefits of multiple deployment models. It can also be defined as multiple cloud systems that are connected in a way that allows programs and data to be moved easily from one deployment system to another.

For a complete article on Cloud Computing, please visit TutorialsWeb.com. The contents of the article include Introduction to virtualization, description of cloud computing, differences between virtualization and cloud computing, different types of cloud models, and some prominent cloud service providers including RackSpace, Google, Amazon, and Microsoft.

Check out some of the tests here: A+ Essentials, CCNA Exam Simulator, CCNET Exam Sim

The exam objectives covered in the exam simulator include the following:

1.0 Implement an EIGRP based solution, given a network design and a set of requirements
2.0 Implement a multi-area OSPF Network, given a network design and a set of requirements
3.0 Implement an eBGP based solution, given a network design and a set of requirements
4.0 Implement an IPv6 based solution, given a network design and a set of requirements
5.0 Implement an IPv4 or IPv6 based redistribution solution, given a network design and a set of requirements
6.0 Implement Layer 3 Path Control Solution
7.0 Implement basic teleworker and branch services

The advantages of a simulated exam are:

- Ability to measure one’s preparedness for taking real certification exam
- To prepare for the exam topics thoroughly from a different perspective (from the text book or guide)
- To familiarize oneself with real exam environment (such as timing, various question types such as drag-drop, hostsport, etc.)

Other Cisco test simulators available from CertExams.com include  Cisco Certified Network Associate (CCNA 640-802), CCNP Switch (642-813), Cisco Certified Entry Network Technician (CCENT), and others.

The Exam Simulator features are given below:

a) The Exam Engine that provides an integrated test environment, wherein, the candidate will be able to check for upgrades, and register the full version online using program interface seamlessly soon after purchase. The candidates will be able to download the demo versions of any other exam simulator offered by CertExams.com using the test engine program interface.

b) The Test Modules represents individual test such as CCNA or A+. These test modules can be downloaded and installed into the Test Engine. The test modules may be updated and/or uninstalled from within the exam engine framework.

About CCNP  Certification: The CCNP is awarded by Cisco Systems(R) on successful completion of three constituent exams, namely, Route 642-902, Switch 642-813, and TShoot 642-832. CCNA certification is a pre-requisite for attempting any of the CCNP exams.

Download Server Plus Certification exams at http://www.certexams.com/download/CCNP-Route.htm

Disclaimer: CertExams.com is neither associated nor affiliated with Cisco® or any other Company. All trademarks are duly recognized.

The exam objectives covered in the exam simulator include System Hardware, Software, Storage, IT Environment, Disaster Recovery, and Troubleshooting.

The advantages of a simulated exam are:

- Ability to measure one’s preparedness for taking real certification exam
- To prepare for the exam topics thoroughly from a different perspective (from the text book or guide)
- To familiarize oneself with real exam environment (such as timing, various question types such as drag-drop, hostsport, etc.)

Other CompTIA test simulators available from CertExams.com include A+ Essentials 202-701, A+ Practical Applications 202-702, and Network+ N10-004. Other exam simulator available include Cisco Certified Network Associate (CCNA 640-802), CCNP Route (642-902), Cisco Certified Entry Network Technician (CCENT), and others.

The Exam Sim consists of

a) The Exam Engine that provides an integrated test environment, wherein, the candidate will be able to check for upgrades, and register the full version online using program interface seamlessly soon after purchase. The candidates will be able to download the demo versions of any other exam simulator offered by CertExams.com using the test engine program interface.

b) The Test Modules that represent individual tests such as CCNA or A+. These test modules can be downloaded and installed into the Test Engine. The test modules may be updated and/or uninstalled from within the exam engine framework.

About Server+ Certification: The Server+ (SK0-003) certification is awarded by CompTIA organization. The exam is intended for candidates having 2+ years of experience in configuring and managing server computers (particularly Windows based servers). Server+ Certification is one of the most widely recognized certification for technicians intending to prove their technical skills in the area of Server Operating Systems installation and maintenance. For those who intend to pursue purely the software side of Server, Microsoft Certification may be preferred.

Download Server Plus Certification exams at http://www.CertExams.com/comptia-server+.htm

Disclaimer: CertExams.com is neither associated nor affiliated with CompTIA® or any other Company. All trademarks are duly recognized.

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Product page: http://www.simulationexams.com/exam-details/security-plus.htm

The exam objectives covered by the certification include Network security, Compliance and operational security, Threats and vulnerabilities, Application, data and host security, Access control and identity management, and Cryptography.

The practice tests offered by SimulationExams.com have 300+ questions with Flash cards, and Exam Cram. The tests may be downloaded at http://www.simulationexams.com/downloads/comptia/security+download.htm

The new objectives replace the older SY0-201, and the older tests are getting retired by December 2011.

WiMAX is a wireless digital communications system, also known as IEEE 802.16 that is intended for wireless “metropolitan area networks”. WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 – 10 miles (5 – 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 – 300 feet (30 – 100m).

The contents of which include WiMAX and its features, architecture, how it works, advantages and disadvantages in comparison with with 3G, 3.5G and LTE. Intel (INTC), Sprint Nextel (S), Motorola (MOT), and Clearwire (CLWR) are all WiMax partners and provide various components of WiMAX such as WiMax chips,  WiMax equipment and handsets.

WiMax is considered most useful for “last mile” connectivity in rural and emerging markets where laying fiber, cable, or DSL is cumbersome or economically not feasible. xDSL is widely used by carriers, because it can provide high data speeds over a dedicated telephone line. ADSL and SDSL reach speeds up to 6 Mbps.

The article also provides a list of broadband equipment providers and service providers such as AT&T, Verizon Communications, Vodaphone, NIT, Earthlink, O2 Broadband, and others.

Read complete article  by visiting  Broadband Technologies WiMAX, LTE, and 3G/3.5G

More articles are available in TutorialsWeb.com

- Lab exercises for hands-on practice.
- Router and switch simulator.
- Simulate Cisco® IOS routers (805, 806, 17xx series, 25xx series, 26xx series, and 36xx series) or switches ( 19xx, 29xx ).
- Connectors available are Serial, Ethernet, IsdnBri, Frame Relay, Fast Ethernet.
- Extensive Lab Manual is provided.
- Support for 300+ router and switch commands.
- Network designer that provides drag and drop feature for inserting devices and connectors. GUI based device configurator.

You can type short form commands in IOS simulator for router/switch commands just like in actual router/switch.

About CCNA Certification:
CCNA Certification is awarded by Cisco Systems on successful completion of qualifying exam(s). CCNA is intended for candidates who have just started working on Cisco ruoters and switches.
The exam objectives covered by CCNA certification include the following:

1. Describe how a network works
2. Configure, verify and troubleshoot a switch with VLANs and interswitch communications
3. Implement an IP addressing scheme and IP Services to meet network requirements in a medium-size Enterprise branch office network.
4. Configure, verify, and troubleshoot basic router operation and routing on Cisco devices
5. Explain and select the appropriate administrative tasks required for a WLAN
6. Identify security threats to a network and describe general methods to mitigate those threats
7. Implement, verify, and troubleshoot NAT and ACLs in a medium-size Enterprise branch office network.
8. Implement and verify WAN links
Other products offered by CertExams.com include the following:

1. CCNA Exam Simulator: The only practice exam that provides complete range of CCNA question types including simlets and simulations.
2. Juniper Junos Simulator for JNCIA

Checkout available labs here: http://routersimulator.certexams.com/router-labs/index.html

Checkout available router/switch commands here: http://routersimulator.certexams.com/commands.html

Note: These will be updated from time to time.

Support for Juniper Swiches – For the first time, Juniper switches have been added to the netsim. Now on, users will be able to configure routers as well as switches using the software. It is now possible to design a Juniper network using routers as well as switches.

Lab Exercises – Several Lab Exercises have been added to include Juniper switches and routers. This provides good hands-on practice for beginners.

New Commands – New commands included for switches and routers. Switch commands for VLANs, VTPs, and others added.

Please view the product page on Juniper JUNOS Network Simulator

You can download the Juniper JUNOS Simulator

1. Top navigation with a drop down menu. The top menu is divided into 5 major categories. These include Electronic SMT Assembly, Satellite Phone Communications, Computers and Wireless Networking, RF Test and Measurement, and Software. Users will be able to browse through different categories and view the tutorials available.

2. Tools menu: The home page consists of a list of free tools available. These include a, satellite link budget calculator, b, satellite look angle calculator, c, RF tools and calculators.

3. Featured articles: The home page has a featured articles section. These include Surface Mount Assembly and Rework, and Computer Printers and Scanners – A Review.

4. New articles: The home page displays new articles that have recently been added to the website in the New articles section. IP v6 Tutorials, Microsoft VB.NET – Drag-n-Drop Program, and Satellite phones tutorial have been added recently.

The website uses Cascading Style Sheets (CSS) extensively. It has also been checked for compliance with major Internet browsers including Internet Explorer, Mozilla FireFox, Opera, and Google Chrome.

Additionally, each article has been laid out such that the navigation within the article is easy. Path to each page of the website with respect to the Home page has been given so that users landing on any page will immediately know the location of the page with respect to the rest of the website.

The articles that are currently available on the website include Surface Mount Technology (SMT) and Components, Reliability Engineering, Satellite Communications, Satellite Link Budgeting, Computer Networking, .NET development, and others.

More new articles are included from time to time. Please visit Tutorialsweb.com and leave your comments.