Subnetting

What-Is-Subnetting

Part 1

I have been debating how to approach this subject of Subnetting, there is not much to say other than it really sucks to learn.  But once you learn it, it just gets easier and more understandable.  Unfortunately, every new subject you learn, with which you have no familiarity with is going to be absolute hell unless you can pick it up quickly.  When I started learning subnetting and then relearned and re-familiarized myself, I have to admit it was tough and I just was not getting it.  But the information super highway, Youtube, and many other tid-bits of information out there in the world can make all the difference in the world.  You might not understand what one method teaches there is always another method that may take hold in your brain.  So, take heart…it may be a roller coaster, but it is our roller coaster.  Just keep looking for the method that makes sense to you, it is out there.  Below are some references, which are not all inclusive as there are a multitude more references for your viewing pleasure.

Youtube, as you probably already know, is an underutilized resource and valuablesubnet-study tool in your arsenal of learning.

Look through these references, videos (you won’t need to view all, just until you are comfortable), and the other web-sites.  To really prepare yourself for the test (CCENT or CCNA) use the IPv4 subnetting – random question generator v1.6  as it will generate random IPv4 subnetting questions for you to practice on (makes it easy for you!)

headerfistAlso, keep in mind that you will be tested on IPv4 for subnetting, so that is what we will be using.  IPv6 is being deployed and you may see it on the test for CCNA, but more likely than not you will not receive test questions on the subnetting of IPv6.

Until we meet again in Part 2…

See also:  Part 1, Part 2, Part 3, Part 4

References:

http://www.vaughns-1-pagers.com/computer/powers-of-2.htm

http://infocenter.guardiandigital.com/manuals/IDDS/node9.html

http://whatismyipaddress.com/cidr

http://wiki.samat.org/CheatSheet/IPv4CIDRNotation

http://www.subnet-calculator.com/cidr.php

VIDEOS:

https://www.youtube.com/results?search_query=boolean+algebra+tutorial&oq=boolean+algebra+tutorial&gs_l=youtube.12..0.2938.2938.0.4782.1.1.0.0.0.0.82.82.1.1.0…0.0…1ac.2.IyvT0psNQTI

https://www.youtube.com/results?search_query=subnetting+made+easy&oq=subnetting+made+easy&gs_l=youtube.12..0l8.5848.5848.0.8952.1.1.0.0.0.0.56.56.1.1.0…0.0…1ac.2.HQ7nSkrQ9tk

https://www.youtube.com/results?search_query=subnetting+tutorial+ccna&oq=subnetting&gs_l=youtube.1.4.0l10.25943.25943.0.36475.1.1.0.0.0.0.56.56.1.1.0…0.0…1ac.1.j6HYrKoahwE

https://www.youtube.com/results?search_query=subnetting&oq=subnetting&gs_l=youtube.3..0l10.43020.43020.0.44157.1.1.0.0.0.0.53.53.1.1.0…0.0…1ac.1.wbNxlIPMxB4

http://video.search.yahoo.com/search/video;_ylt=A0S00MtSWBlRFUEAyxb7w8QF;_ylu=X3oDMTBrMWQyNXBmBHNlYwNzZWFyY2gEdnRpZANWMTM2?p=ip%20subnetting&ei=utf-8&fr=moz35&fr2=sg-gac&sado=1

Other Web-Sites:

http://mrwhatis.com/subnetting-box-method.html

http://www.subnetting-secrets.com/easy_way_to_subnet.html

http://orbit-computer-solutions.com/VLSM.php

http://www.gtcc-it.net/billings/VLSM.htm

http://www.subnetting-secrets.com/vlsm.html

http://www.subnetting-secrets.com/easy_way_to_subnet.html

IPv4 subnetting – random question generator v1.6  http://subnetting.org/

Advertisements

More on RFID

Children have no choice.  Katherine discusses the San Antonio school district plan to give all students “the chip” so that they can be tracked throughout the day.  They are starting with the school with the lowest number of native English speakers.

Listen to her program by tapping on “the chip”

Passwords and New Jobs…

If you have a Facebook, Twitter, or any other social networking account, can you be asked for you account and its password?  Short answer, YES they can ask but you do not have to give it up…I imagine that depends upon how badly you need the job, also.  This does seem to be the big rave on the news, other than the Obama-Care challenge.

There is software that companies tend to use to sift through the internet to find out if anyone is talking bad about their company AND people have been fired for talking bad about the company that they worked for (note the operative term “worked”).  You have an obligation to not denigrate the company you work for and many of them have policies that reflect such a thing.  If you cross the line you should be held accountable…if only it were a perfect world where everyone was held to the same standard!  But anyway…

You have a right to privacy and there are certain lines that should not be crossed.  While on Facebook, I had posted the article “Should Companies be allowed to ask for your Facebook Password?” by Tuan C. Nguyen.  Someone answered with a comment essentially saying that if a company did ask for my password I could not work for them because they acting unethically (they want their passwords to be secure, but want yours?) and it would be a security violation of password sharing which is frowned upon in the IT community.  And he is definitely right…one of the first things you are taught is security & protection.

Until the next exciting adventure!

 

References:

http://www.smartplanet.com/blog/thinking-tech/should-companies-be-allowed-to-ask-for-your-facebook-password/10872?tag=nl.e660

 

RFIDs Part 5

This segment is not actually Radio Frequency ID, but it is a related issue.  People are so hell bent on convenience that they, more often than not, fail to think of the long term and devastating possibilities.

Now you will be able to pay by using the smart technology within your phone.  there are, and will be more, applications granting access to your banking institutions to pay for your purchases.  Many of the loyalty card programs are looking into similar technology for purchase discounts.

What exactly are the ramifications for this in your life?  How secure is your phone and the signal it uses?  Most people do not even pass-code their phones, because it is inconvenient.  How inconvenient will it be when your account is wiped out?  Now your phone will contain access to all your financial data, all of your purchasing data, purchasing habits (i.e., food, clothes, technology, etc.)

By pushing everyone to use credit & debit cards the banking industry is really striving toward a cashless society.  In doing so, they are forcing everyone to make purchases with a flippant and cavalier approach and will cause much more debt spending in your life than if you were using cash.  A study was done (I heard about it on the Katherine Albrect Show http://www.katherinealbrecht.com/index.php?option=com_content&view=frontpage&Itemid=1) in which a study was done when cash money is being used to pay people tend to be more mindful on the expenditures; whereas, with the airline industry they are no longer taking cash on flights and you are forced to use credit card and you are more likely to spend more with its use.  This is because most people do not want to spend such a small amount on a card and will be more flippant with its use.

It is already a well known fact that such technology can be used to monitor your actions, expenditures, and conversations.  With the advent of many District Court decisions which permit police to do so without any warrants.

I am always concerned when privacy is concerned…it is not alright when the tech savvy peeping tom down the street does such things, but it is legal when the government does it????? hmmmmmm!

SEE ALSO:  RFID Part 1, RFID Part 2, RFID Part 3, RFID Part 4

Here are some articles to view:

http://www.dailymail.co.uk/sciencetech/article-2115871/The-CIA-wants-spy-TV-Agency-director-says-net-connected-gadgets-transform-surveillance.html

http://www.openforum.com/articles/belly-up-to-the-digital-loyalty-card-groupons-founders-have

http://www.statesman.com/business/new-customer-loyalty-card-good-at-100-plus-2226233.html

http://www.reuters.com/article/2012/02/22/us-idtheft-javelin-idUSTRE81L16520120222

http://www.paymentobserver.com/

http://www.physorg.com/news/2012-03-mobile-industry-champions.html

 

 

Secure eMail

I recently read a c|net article about an interesting web-site and its service.  The article is “This email will self-destruct…” and mentioned the services at https://oneshar.es, which permits a person to send a one-time message; after the url is accessed one time the information is destroyed and removed from use.  I was rather curious about it and queried Mr. Cipriani about what happened to the information, of which he verified that the information was removed from the system.

This has spectacular possibilities for secure email or messaging.  There are some applications which you can encrypt the message and then you could send via oneshar.es the password or passphrase.  You could just send out a one time message to a person.  In either case, you can determine how you wish to use it, but it is one of those useful applications that may be handy to you, one day.

Keep it on the back burner for now.

http://howto.cnet.com/8301-11310_39-57377686-285/this-e-mail-will-self-destruct..–heres-how/

Passwords

I was reading an article at the InfoSecurity web-site, which had an interesting note on the psychology of passwords.  A recent survey indicated the contradiction of password security, in-that, people desire password security and that they be strong and changed often; however, these people would, themselves, not change their passwords on a regular basis nor make them difficult and strong.  Rather concerning, don’t you think?

 

http://www.infosecurity-magazine.com/view/24057/the-contradictions-of-password-psychology/?utm_source=twitterfeed&utm_medium=twitter