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Information technology (IT) is the branch of engineering dealing with the use of computers and telecommunications, developing and maintaining systems as well as retrieving, storing and transmitting information. Therefore, any person wanting to develop a career in IT should be aware of the value of IT certifications.

Through education and certification, professionals gain the skills, knowledge, and validation needed to be recognized as an expert in diverse products or technologies. MCSE Certification, CCNA Certification, A+ Certification, and SAP Certification are just a few of the many credentials an IT professional may achieve.

Microsoft certification programs are considered to be the major advancement to gain both professional and education background. There are several Microsoft certifications currently available for both onsite or offsite training; being MCSE Certification, one of the most frequently requested certifications.

The Microsoft Certified Systems Engineer (MCSE) certification prove an individual’s expertise in designing and implementing the required infrastructure for any type of business solutions based on the Microsoft Windows 2000 platform and Microsoft Windows Server System.

Demand for the network administration job function is another branch of IT, which has grown significantly, the same as candidates applying for this certification, particularly CCNA Certification.

The CCNA certification (Cisco Certified Network Associate) indicates a foundation in apprentice knowledge of networking with certified professionals able to install, configure, and operate WAN, LAN, and dial access services for small networks with 100 nodes or fewer

Operation and configuration services also includes but are not limited to use one but several of the following protocols: Serial, Frame Relay, IP RIP, IP, IGRP, VLANs, RIP, and Ethernet, Access Lists.

IT Certifications in career development add valuable credentials for IT professionals in a competitive industry where a certification for jobs like these is needed at the same time that learning is necessary due to the constant changing business environments
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Whether you’re working on your CCNA or CCNP, Cisco certification exams are the most demanding computer certification exams in the IT field.  Cisco exams are not a test of memorization, they’re a test of your analytical skills.  You’ll need to look at configurations and console output and analyze them to identify problems and answer detailed questions.  To pass these demanding exams, you’ve got to truly understand how Cisco routers and switches operate – and the key to doing so is right in front of you.

The debug command.

Of course, there is no single “debug” command.  Using IOS Help, you can quickly see that there are hundreds of these debugs, and I want to mention immediately that you should never practice these commands on a production router.  This is one major reason you need to get some hands-on experience with Cisco products in a home lab or rack rental.  No software program or “simulator” is going to give you the debug practice you need.
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From the CCNA to the CCIE, ISDN is one of the most important technolgies you’ll work with.  It’s also very common in the field  ISDN is frequently used as a backup connection in case an organization’s Frame Relay connections go down.  Therefore, it’s important to know ISDN basics not only for your particular exam, but for job success.

ISDN is used between two Cisco routers that have BRI or PRI interfaces.  Basically, with ISDN one of the routers places a phone call to the other router.  It is vital to understand not only what causes one router to dial another, but what makes the link go down.

Why?  Since ISDN is basically a phone call from one router to another, you’re getting billed for that phone call — by the minute.  If one of your routers dials another, and never hangs up, the connection can theoretically last for days or weeks.   The network manager then receives an astronomical phone bill, which leads to bad things for everyone involved!

Cisco routers use the concept of interesting traffic to decide when one router should call another.  By default, there is no interesting traffic, so if you don’t define any, the routers will never call each other.

Interesting traffic is defined with the dialer-list command.  This command offers many options, so you can tie interesting traffic down not only to what protocols can bring the link up, but what the source, destination, or even port number must be for the line to come up.

One common misconception occurs once that link is up.  Interesting traffic is required to bring the link up, but by default, any traffic can then cross the ISDN link.

What makes the link come down? Again, the concept of interesting traffic is used.  Cisco routers have an idle-timeout setting for their dialup interfaces.  If interesting traffic does not cross the link for the amount of time specified by the idle-timeout, the link comes down.

To summarize:  Interesting traffic brings the link up by default, any traffic can cross the link once it’s up a lack of interesting traffic is what brings the link down.

Just as important is knowing what keeps the link up once it is dialed. Why?  Because ISDN acts as a phone call between two routers, and it’s billed that way to your client.  The two routers that are connected by this phone call may be located in different area codes, so now we’re talking about a long distance phone call.
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types separate in your mind, and then remembering what they’re used for.  This often occurs when a CCNA or CCNP candidate starts putting together their own home practice lab, and they suddenly realize that they have the equipment to run labs, but not the cables.

With this in mind, here are some common Cisco cable types and their primary use.

First, there’s the regular old “straight-through cable”, so named because the eight wires inside the cable go straight through the wire.   While the wires may be twisted inside to reduce electromagnetic interference (EMI), the wire that’s connected to Pin 1 on one end is connected to Pin 1 on the other end, and so on.   In a home lab, a straight-through cable is often used to connect a switch port to an Ethernet port on a router, with a transceiver attached to the Ethernet port.   Straight-through cables are also good for connecting a BRI interface to an ISDN simulator.

The “crossover cable” is so named because the wires do cross over between pins.  This allows the devices to both send and receive at the same time, and crossover cables are a must for directly connecting ports on Cisco switches to create a trunk.

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Getting CCNA Certification certified is easy. We are here to help you get your certification effortlessly. You can choose from among the wide range of our products and services available for CCNA certification.

The Cisco Certified Network Associate (CCNA) exam is an entry-level certification designed for network administrators and engineers. It can be taken in one of two forms. First, the CCNA can be taken in one, single exam – The CCNA Composite 640-802. Second, it can be taken as a two part exam designated Interconnecting Cisco Network Devices 1 and 2 (ICND1 and ICND2).

A majority of the professional networking world consider the CCNA to be the defacto Network Engineering exam that qualifies

operate a small to medium business network. Furthermore, the CCNA opens doors for new exams, such as the CCNP (Cisco Certified Network Professional) and CCDP (Cisco Certified Design Professional) certifications. Therefore, the exam is not in any way easy.

Overall, the CCNA has several subjects that it covers in detail, but the primary subjects of concern are Routing and Switching, including but not limited to the use of: IP, IGRP, Serial, Frame Relay, IP RIP, VLANs, RIP, Ethernet, and access lists. After attaining the CCNA, the CCNA Exam is valid for three years before it must be recertified.

Benefits of CCNA Certification

CCNA certification demonstrates that Cisco, the leading developer and provider of network technologies has recognized you as an expert in designing, installing, operating and troubleshooting medium-size routed and switched networks. This certification paves your way to the more advanced Cisco certifications. CCNA certification can make you more valuable to your company and help you get more salary and preference in promotions. CCNA certified professionals can get appropriate jobs and respectable position in the Networking industry.

Job Roles for CCNA certified professionals The job roles for CCNA Certified Professionals typically include: Network administrator, System Analyst and Network Support Professional.

CCNA Exams requirements

Cisco has announced changes to the CCNA certification and exams in June 2007. Cisco has now introduced ICND1 (640-822), ICND2 (640-816), and CCNA (640-802) exams. The 640-802 exam will be the single exam option for becoming CCNA. Alternatively, passing ICND1 and ICND2 will provide you the CCNA certification. However, passing ICND1 will provide a separate certification named Cisco Certified Entry Networking Technician (CCENT).

You can choose either of the two paths for becoming CCNA:

Single Exam Option > Pass Exam 640-802 > CCNA Two-Exam Option > Pass 640-822 (ICND1) > CCENT > Pass 640-816 (ICND2) > CCNA

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