Certification Exams

Certexams.com ccna netsim for hands on practice for candidates preparing for Cisco CCNA exam. VPN site to site and HSRP labs added.

Linux/Unix operating systems has traditionally been believed to be very stable and robust. A web site housed on a Linux operating system will have very high up-time (of the order of 99.9%). Of course, other factors such as power supply, network admin skills, and network load etc. also matter when it comes to maintaining the system uptime.

Though Google gmail is not among the first to come up with free email accounts for public, it has become very popular. Google provides a suit of free utilities including gmail, gdocs, google analytics, google web master tools, etc.

Google adsense is one of the most widely used ad network for which there are millions of users. Adsense works by placing a small ad on the website content page, which when clicked by a website visitor, will lead the visitor to another site.

Website usability and accessibility are two important factors from user point of view. The web page describes various points that enable web usability and accessibility. Some web usability techniques include proper titles, font size and styles, working hyperlinks, and alt image texts.

Provides various tips and guidelines for promoting your website. These include search engine submissions, social site submission, directory submission, and other means. Website promotion is vital to any web based content to be found on the Internet.

Directory submission is one of the ways to make a web site content found on the Internet. However, recently, the directory submissions had taken back seat and not much used by the Internet users. Instead, social sites have become most widely known. Even popular directory sites had been removed by Google search results.

PPC short for Pay Per Click, is one of the widely used models in search engine monetization. For example, Google and Bing offer PPC which enables businesses to bid for keywords and acquire first place in search engine results. PPC for some papular keywords such as web hosting, car rentals, etc costs several dollars per click

Google, being the most widely used search engine, requires special consideration in optimizing your website for search engines. Google has expanded its services from being a simple search engine to offer google email, google docs, google adsense, google adwords, android operating system, google analytics, google webmaster tools, and several others.

The page offers search engine dependency of various prominent search engines. Though the article is a bit older, the search engines are still inter related to one another one way other other. Prominent search engines includes Google, Bing, Yahoo, Ask, duckduckgo, and others.

Spread Spectrum a kind of signal modulation, in which the signal frequency is spread over a very wide bandwidth. The band spread is achieved by chipping the signal with a code which is independent of signal. A code synchronized reception at the receiver is used for despreading and subsequent data recovery. Though started as a military application, it soon received applications in civilian communications.

RFID, short for Rradio Frequency IDentification, enables identification of a tag (that is normally attached with an entity) by using electromagnetic waves. The function served by RFID is similar to bar code identification, but line of sight signals are not required for operation of RFID. Also, RFID works for longer distance than a bar code reader. Typically, a reader can be several feet away from the reader.

The article provides an detailed review of current and developing technologies in wireless broadband. The technologies discussed in the tutorial include WiMAX, Long Term Evolution (LTE), WiFi, GPRS, 3.5G and 4G. The advantages and disadvantages of each of these technologies have been discussed. Further, some of the reputed manufacturers of the wireless broadband equipment, and the broadband service providers such as Verizon, Cable Vision, EarthLink, and O2 Broadband (UK) have been discussed.

WiMAX is a short name for Worldwide Interoperability of Microwave Access. Wimax consists of a base station and a receiver.. Wimax is a similar technology like WiFi, however, Wimax covers much higher distance range compared to WiFi and both the technologies are incompatible. WiFi is typically used within a building or a campus, whereas Wimax is used by ISPs to connect consumers over a wide geographical area, such as a city.

The article covers several broadband technologies including wimax, lte, wifi, gprs, and 4g. The relative advantages and disadvantages have been discussed. Recent trends in broadband transmissions have been provided.

This article describes the importance of networking components such as routers and switches, and provides an thorough review of cisco and Juniper routers and switches. Basic network

The article describes various stages of computer networks such as planning, designing and implementation. With the advent of Internet, computer networks are widely used for accessing the Internet and local networks (such as LANs and intranets).

TCP/IP, short for Transmission Control Protocol/ Internet Protocol is the protocol of choice for Internet communications. The article describes layered approach to the protocol stack and relates to the 7-layer OSI protocol.

A tablet personal computer (tablet PC) is a pocket computer equipped with a touch screen for input, and running an OS such as android or iOS. Tablet PC screen size is usually in the range of 7" up to 11". After 11 inches, it usually comes into small size laptop and hardly fit your packet. Lower than 7inches, smart phones are popular. The article describes the components of a tablet PC, advantages and disadvantages, and how it compares with laptop and smart phones.

The article on Printers and Scanners, a very popular one on tutorialsweb.com, discusses various aspects of printers and scanners, including the functionality, troubleshooting, different types of printers and scanners, and the manufacturers. The future trends and references have also been provided.

Flash memory is a form of EEPROM (Electrically Erasable Programmable Read-Only Memory) that allows multiple memory locations to be erased and/or written using electrical signals. It is a rewritable memory chip that, unlike a RAM(Random Access Memory) chip, power supply is not required to hold the contents. It is commonly used in memory cards, USB flash drives, MP3 players, digital cameras and mobile phones. Flash memory is also an example of a Non-Volatile Read Write Memory (NVRWM).

A motherboard is the main circuit board inside a computer that connects different parts of a computer together. It has sockets for the CPU, RAM and expansion cards and it also hooks up to hard drives, disc drives and front panel ports with cables and wires. There has been continuous innovative development in the area of motherboards with the bus speed increasing to a few giga bytes per sec and increasing connector density. Most widely used motherboards such as ATX, ITX are discussed.

The tutorial provides a detailed view of important components of a typical computer motherboard, which include SATA/EIDE disk drives, USB 2.0/3.0 connectors, eSATA connectors, and PCIe connectors. CPU socket types, north bridge and memory slots have been discussed.

The article provides a guide for link power budgeting in satcom. Link budgeting is a term used to estimate the size and electrical parameters required for various satellite system components such as antenna, high power amplifier (HPA), LNC, satellite dish etc. Check out the full tutorial there.

The tool provides satellite look angles after inputting the ground station longitude and latitude. The pointing angles are required to orient the earth station antenna towards the satellite for proper reception of the signals.

Satellite phones, as the name implies, uses satellite signals to operate, where as conventional cellular phones use terrestrial signals from cell towers to communicate. Relatively, satellite phones are expensive when compared with other types of phones, however satellite phones have wide geographical foot print and could be used where terrestrial signals are unavailable or not feasible.

CIW, short for Certified Internet Webmaster, is offered by Prosoft Systems. The certification is available in various levels, including Associate, Professional and Expert levels. The associate level cert is called CIWA (Certified Internet webmaster Associate) and is a widely known certificate in the area of web design and development using html, xhtml, CSS, XML, XLS, and XLST. CIW skill areas include Web Foundation Series, Web & Mobile Design Series, Web Development Series, and Web Security Series. Check out the article for more information.

The OCPJP (Oracle Certified Professional Java Programmer) certification is offered by Sun, and considered to be authoritative in the world of Java programming. The next level of certifications consist of specialty certifications such as Web Component Developer SCWCD, Mobile Component Developer SCMCD, Business Component Developer SCBCD, etc. Please visit the Java website for more information on Java Certifications.This certification covers core Application Programming interfaces used to design object-oriented applications with Java, as well as insight into Java applications such as those that manipulate files, directories and file systems.

The Juniper Networks Certified Associate - Junos (JNCIA-Junos) is the entry-level credential required before candidate can proceed with advanced Junos certification. Candidates will have knowledge of the Juniper Networks Junos OS, networking fundamentals, and basic routing and switching after this certification.

Exam notes for PMP certification available for final preparation of Project Management Professional exam. Practice tests are also available for the same. Project management institute conducts pmp exam.