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VIP Perspectives

54 Posts
2

Every network engineer knows about "port-mirroring", aka SPAN/RSPAN which is a way to capture packets in a switched environment. We also know about the capture feature on the ASA firewall but what about routers? We could use the undocumented debug ip packet dump command but we all know that the debug process only sees process switched packets. So is there a similar feature as on the ASA? The ...

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12

Buying a circuit from a service provider can be challenging. What kind of circuit should you get and what are the things that you should look out for?   1. Type of Circuit   What kind of circuits do they offer? Do they both have layer 2 and layer 3 circuits?   What are the restrictions for the layer 2 circuit? How many MAC addresses are allowed? Is it fully transparent to ...

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7

Communication Protocols

Posted by Jared Mar 14, 2014

In the networking world, we see the word "protocols" quite often.  Just what is a protocol?  The dictionary will define a protocol as a set of  rules or a process or procedure of how to proceed or act.  Communication protocols in the network are the rules that are followed when transmitting and receiving or exchanging information. Back when I was studying for the CCNA, two ...

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14

I see people asking the question every day "which certification or track should I choose"?   Should I go for Voice or R&S or DC or Security or something else? As networking technology continues to evolve, it has been divided into several tracks. Each track deals with that specific area of the technology. So the question still remains the same.  Which one to choose? ...

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12

I  remember from my early career days working on PBXs that SDN was a  Subscriber Directory Number. Later in my career in various consulting  gigs, I knew SDN as Secure Data Network. Today is has become more well  known as Software Defined Networking.   Facetiously,  to many it means Still Don't (K)now or paraphrased from old ISDN jokes,  it means Still Does ...

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14

Our industry is one of big pictures and details, breadth and depth. Depending on where you work, you may wear many hats, or you may focus on only a single facet of a single environment. People can be Generalists_(as covered in previous VIP Perspective blogs) or you can be Specialists. Yet, at the end of the day, many job descriptions for roles across the internet look the same. Interviews are ...

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8

I’ll be the first to admit that the “I can’t” attitude of many attempting to enter technology careers is a little disheartening. While not everyone entering this field subscribes to this disposition, many mistakenly fall into the trap. This article is about achieving a “level-set” regarding where you are individually and the necessity to map out how to get ...

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18

One of the most important tasks of a network administrator is to backup the network configuration files of every Cisco device periodically. This periodicity is dictated and established by the organization policies. Frequency could be every week, every fifteen days or every month depending on the needs of the organization.   The importance of the configuration files of the network can be seen ...

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4

   It’s 8:00 AM on the east coast of the United states and the support team is beginning to get a lot of calls from users that claim some critical network resources are unavailable.  The support staff manager calls you for help.  After about 30 minutes of troubleshooting, your phone begins to ring off the hook.  You are getting more and more reports that some users ...

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10

A topic that comes up on a regular basis is the struggle of getting and finding work. This seems to be especially challenging for those getting started. A common challenge is trying to find a job without experience. That leads to the challenge of getting experience without a job. Many seem to blindly turn to certifications with the expectation that it will fully resolve this issue. This article ...

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8

Congratulations!  You have obtained a CCNA certification.  Now what?  What is the next step?  This is a question that is asked quite frequently in many ways on the Cisco Learning Network.   When I have faced this question, and I have faced it many times, two main paths come to mind. The first thing people usually think of is what certification to get after they earn the ...

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5

Cisco Live US is now just around the corner. For those who have never attended, I would strongly recommend this event if the opportunity arises. In my opinion, this is one of the finest public technical events I’ve ever attended. For me, it is about much more than just the sessions. The true value of this event includes the conversations that happen in the hallways and at meals, discussions ...

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19

You are studying for ICND1 or ICND2, and you take a quick break to check out CLN. Something on the pages catches your eye - you've seen the announcement! New CCNA exams are coming! Dread, panic and a little bit of excitement all rush in at the same time. Welcome to the Cisco Certification club!   Every 2-4 years Cisco will refresh a certification track, sometimes less often. When they do ...

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2

Today, Cisco announced several changes in the CCNA program and its requirements. One of the changes that should be obvious, but can easily go unnoticed is the name. Although Cisco has been calling the certification CCNA Routing and Switching in some settings, it wasn’t the official name of the certification until today. Other changes also include shuffling some items from ICND2 down into ...

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5

There is a depressing question that comes up regularly. This question appears both on this forum and in face-to-face conversations. While it is quite ominous, it is also very important. In almost all cases, I believe it is actually the wrong question. In about as many cases, my answer is the same. So what is this question and why does it makes me cringe? The question is, “Am I too old to ...

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