Showing posts with label CCNA. Show all posts
Showing posts with label CCNA. Show all posts

How To Choose The Best Computer Certification For You?

When you're choosing which computer certification to pursue next, you should also be formulating a plan for your career. Your time is precious, and you should never choose to pursue a certification because it's "hot". There are some hard questions you should ask yourself before deciding to pursue the CCNA, CCNP, CCVP, CCSP, CCIE, MSCE, or any of the many other vendor certifications that are out there.

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Why do I want this certification?

This is the biggest and most important question you should answer before you spend a dime on books or classes.

If your primary goal in earning a certification is the money you feel companies will throw at you after you get it, make sure to do your research first. Basing your certification pursuits on a salary survey can lead to some serious frustration on your part. Don't get me wrong, I like money. J But those surveys can be very misleading. There's really no such thing as an "average" salary in IT. Job responsibilities and requirements vary greatly from company to company, to the point where a "network admin" may make $25K at one job and $75K at another. You can see where such variations in pay can lead to some misleading statistics. (And if you're thinking of attending a tech school whose main pitch is "look at all the money this cert can get you", ask a lot of questions about how they arrived at this amount.)

A positive answer to this question works wonders. If you have a plan for your career, you'll know how this certification can fit into your plans. If you don't know what you're going to do with it when you get it, or worse, don't have a plan for your future, you may be wasting your time. Ask yourself the hard questions now - you won't regret it.

How does the vendor protect my investment of time and money?

Let's face it: earning your certification costs time and money. You've got to set time aside to study, you'll need books, perhaps a class, etc. If you're spending that money and time, it should be to make yourself more valuable in the workplace.

The vendor should also have a vested interest in keeping your certification valuable. Take Cisco, for instance. I was at a bit of a career crossroads a few years ago. Should I pursue my masters degree, or pursue the CCIE? I took a strong look at both choices, and I knew that Cisco works endlessly and tirelessly to protect the value of their certifications. While other major vendors have made strides to do so, I felt Cisco did the best job of protecting the value of their certifications. That's why I felt secure in the investment of my finances and time into a major Cisco certification, and I've never made a better decision.

Before making a major investment into a computer certification, consider the steps that a vendor does or does not make to protect your investment.

Computer certifications have helped me tremendously in building my IT career. By asking the right questions, and taking a hard look at your motives and plans before pursuing a given certification, they can do the same for you.

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of over 100 free certification exam tutorials, including Cisco CCNA certification test prep articles. His exclusive Cisco CCNA study guide and Cisco CCNA training is also available!

Visit his blog and sign up for Cisco Certification Central, a daily newsletter packed with CCNA, Network+, Security+, A+, and CCNP certification exam practice questions! A free 7-part course, "How To Pass The CCNA", is also available, and you can attend an in-person or online CCNA boot camp with The Bryant Advantage!

Article Source: http://EzineArticles.com/?expert=Chris_Bryant

Portfast and the CCNA - Joe Spoto

Portfast

As a CCNA/CCNP candidate you are expected to understand the purpose and function of Spanning-tree Portfast. The CCNA/CCNP's exam will ask of you to determine the purpose of the Portfast within the spanning-tree protocol.

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Before we go into the detail for the purpose and operation of the Portfast feature we need to understand the switched network environment behaviour before the introduction of portfast as a command..

From the "BPDU Guard" article you will recall that the stability of the Root Bridge is of paramount importance in the operation and continual uninterrupted service of spanning-tree and that a change in the position of the Root Bridge will cause service disruption on the network; another important factor to bear in mind is that is it not just the changing of the position of the Root Bridge that can cause network disruption but events such as access switchports transitioning on/off line can create an unstable network.

When a port first goes on-line spanning-tree will treat it like it treats any other port and will cycle through the normal spanning-tree port roles, i.e. blocking, listening. Learning, forwarding. The port will transition to the forwarding state after 30secs. In which no user traffic is allowed to pass.

At the point that the port went on-line the switch would have generated a new type of Bridge Protocol data unit called a "Topology Change Notification" BPDU, this TCN is relayed up out of the Root port towards the Root Bridge, the Root Bridge will register this TCN as a "Topology Change" and reset the TCN timer. These timers can be viewed by issuing the "show spanning-tree vlan # detail". These false readings will cause no end of confusion in your fault finding and network disruption as you chase false positives.

The major benefit of Portfast on the access port, (since this command can only an should only be configured in access ports) is that it causes spanning-tree to bypass the lengthy forward delay timers on that port.

Port fast is enabled on an access port:

Swith(config-if)#spanning-tree portfast

Once PortFast is enabled it place the port directly into the forwarding state, bypassing the spanning-tree forward delay timers, but at the same time the PortFast feature will keep an eye open for any BPDU's entering the access ports. If at any time the port received a BPDU it will default back to normal operation.

With the Portfast feature on the port the switch does not generate any more TCN's when the port transitions on/off line, this means that any "Topology Changes" that you view from the output of the "show spanning-tree detail" you will see valid TCN's along with the port that the TCN was received on.

Joe is a senior lecturer at Commsupport networks CCNA training in the United Kingdom. Joe teaches Cisco CCNA, CCNP, CCVP courses when he is not out on the road fixing and building networks, if you want to find out more about what we do at Commsupport please visit us at CCNA Course.

Commsupport run free one day training sessions and free online webinars, CCNA training.

Article Source: http://EzineArticles.com/?expert=Joe_Spoto