Archive for September, 2008
09.06.08
Posted in Uncategorized at 11:52 pm by admin
The BSCI exam and CCNP certification requires that you be well versed in the basics of IP Version 6, or IPv6. If you’re new to IPv6, you’ll quickly learn that it’s not exactly just two more octets slapped onto an IPv4 address! IPv6 addresses are quite long, but there are two ways to acceptably shorten IPv6 address expression. To pass the BSCI exam, become a CCNP, and get that all-important understanding of IPv6, you’ve got to understand these different methods of expressing an IPv6 address. My last IPv6 tutorial discussed zero compression; today we’ll take a look at leading zero compression.
Leading zero compression allows us to drop the leading zeroes from every field in the address. Where we could only use zero compression once in an IPv6 address expression, leading zero compression can be used as often as is appropriate. The key with leading zero compression is that there must be at least one number left in each field, even if that remaining number is a zero.
You sometimes see books or websites refer to leading zero compression as “dropping zeroes and replacing them with a colon”, but that explanation can be a little confusing, since the blocks are separated with a colon to begin with. You’re not really replacing the leading zeroes, you’re dropping them.
Let’s look at an example of leading zero compression. Taking the address 1234:0000:1234:0000:1234:0000:1234:0123, we have four different fields that have leading zeroes. The address could be written out as it is, or drop the leading zeroes.
Original format: 1234:0000:1234:0000:1234:0000:0123:1234
With leading zero compression: 1234:0:1234:0:1234:0:123:1234
There’s no problem with using zero compression and leading zero compression in the same address, as shown here:
Original format: 1111:0000:0000:1234:0011:0022:0033:0044
With zero and leading zero compression: 1111::1234:11:22:33:44
Zero compression uses the double-colon to replace the second and third block of numbers, which were all zeroes; leading zero compression replaced the “00″ at the beginning of each of the last four blocks. Just be careful and take your time with both zero compression and leading zero compression and you’ll do well on the exam and in the real world. The keys to success here are remembering that you can only use zero compression once in a single address, and that while leading zero compression can be used as often as needed, at least one number must remain in each field, even if that number is a zero.
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of free CCNP and CCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
For a FREE copy of his latest e-books, “How To Pass The CCNA” and “How To Pass The CCNP”, just visit the website! You can also get FREE CCNA and CCNP exam questions every day! Pass the BSCI exam with The Bryant Advantage!
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09.01.08
Posted in Uncategorized at 10:28 pm by admin
One of the best decisions you can ever make is to attend a computer training school. As I’ve written in several other articles, you have to ask the right questions before writing a check or taking out a student loan, but when you find the right school you are indeed on your way to a successful career.
There’s a big difference between attending a tech school and excelling at the classes, though. Whether you just “float through” the school or really work hard is totally up to you. From my personal experience at such a school, I’d like to offer you one simple tip that will quadruple your chances of success at the school and in the job market.
Get there early and stay late.
When I attended a tech school years ago, I admit I was surprised that most of my classmates had what I call the “junior high school” mentality - they would get there late and leave as soon as class is over. Guess what? You’re no longer in junior high. You’re attending this school to create a career for yourself. Get to class early, get some extra study and work in while you’re waiting for class to start, and then stay after class!
The most important part of your computer school studies is getting hands-on experience with the technologies that you’re learning. If you’re taking a Cisco class, you need to work with a router or switch as often as you can. If you’re learning a software program, you need to work with that program in the school’s labs as much as possible. Reading books alone will not teach you everything you need to know. The best time to get extra work in is after class. You may not be able to work in the computer labs at night if the school offers night classes, but odds are there are very few people in there during the afternoon. You need to be one of those people.
Doing only what is required of you is not the path to excellence. You need to go beyond the requirements of the school and invest the extra time and effort into your career. I speak from experience - there is no field in the world that rewards individual effort more than the IT field. Develop the habit of going “above and beyond” today, and this will pay huge dividends for you in the future.
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage, home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
For a FREE copy of his latest e-books, “How To Pass The CCNA” and “How To Pass The CCNP”, visit the website and download your free copies. You can also get FREE CCNA and CCNP exam questions every day! Pass the CCNA exam with The Bryant Advantage!
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Posted in Shopping Stuff at 12:26 am by admin
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