Passing the Network+ and CCNA exams demands that you know quite a few port numbers, but they”re important to know when working with real-world networks as well. Before we discuss why, here’’s a partial list of important port numbers to know for these certification exams:
Ports 20 and 21 are used by File Transfer Protocol (FTP).
Port 22 is used by Secure Shell (SSH).
Port 23 is used by Telnet.
Port 25 is used by Simple Mail Transfer Protocol (SMTP).
Port 53 is used by DNS.
Port 69 is used by Trivial File Transfer Protocol (TFTP).
Port 80 is used by HTTP.
Port 110 is used by POP3.
Port 143 is used by IMAP.
Port 443 is used by Secure HTTP (HTTPS).
When you”re faced with a list such as this, there’’s a temptation to ask yourself something like this: \”Besides passing the exam, do I really need to know these port numbers?\”
The answer is yes. We do a lot of troubleshooting in this business, and part of becoming an expert troubleshooter is knowing how things work when they”re working correctly. That way, when things do go wrong, you can take a structured approach to fixing them.
Let’’s say that you”re in the middle of a relaxed day at your network monitoring console. A consulting company is at your site to install a new firewall. While they”re working, your phone starts going off – users are suddenly unable to send and receive email from outside the office. The first thing to ask yourself in such a situation:
\”What has changed since what is now broken was working?\”
In this case, a firewall is being installed – but do you know why that would stop email? Do you know that ports 25 (SMTP), 110 (POP3), and 143 (IMAP) must remain unblocked by that firewall? If you do, you already know how to fix the problem.
I can tell you from personal experience that the key to becoming a world-class network troubleshooter is mastering the basics, and that includes knowing common port numbers. And if you”re a great network troubleshooter on top of being CompTIA Network+ and CCNA certified, you”re always going to be in demand — and that’’s where you want to be!
For sure, a lot of people who own a website in the internet have heard and know SEO or search engine optimization.
Indeed, knowing what SEO is a good thing but understanding SEO is different. There are heaps of people who don抰 give some time in understanding SEO, and what they do, is just look for someone to do SEO for them. But there are some people in order to earn quick money, gives loads of misplaced advices, and what really matter to them is earn money. There are some techniques that really work, that this article will tell you.
Beware to people or SEO experts (which they say they are) who tells you that they can get you to be on top rank on Google, that you will be on the first or second page of this particular search engine quickly. Indeed, you wanted to be rank in that particular search engine, but think again, can the so called SEO expert do that. Maybe this so called SEO expert can make you on the top rank in doing some techniques, but techniques that will make your website be banned soon. The techniques that this so called SEO expert can do are by making hidden pages or cloaking, these are some of the favorite ways this people do.
The great way you need to do is attract users and visitors to your website. One of the great ways to do this is by working with other webmasters, make them link with your website or they will add your link to their website.
Looking for websites to link with your website is not that easy, it requires hard work. Great way of learning about SEO and to find other websites to link with yours is communication. Communication plays a big part in this certain field. It is wiser to talk and communicate with other websites by knowing their experiences. You can learn through their experiences. And of course, you have to ask them if they can put a link to your website on theirs.
In order to promote your website, you have to do some communicating to other webmasters and by learning through their experiences.
But you also have to bear in mind that the content of your website has value, make sure that it is original and unique. Having contents with value will make visitors visit your website. You also have to make sure that you can give readers and visitors valuable information, in order to attract them. And another advantage of ensuring the value of your content is that it can encourage other websites to link with yours. These are the tactics that really work; all you have to do is take these tactics into consideration. If you really want your website to be on the top rank, hard work and communication are important.
Another important factor you need to bear in mind is that, being on the top rank takes some time. You really have to focus on the mentioned techniques first, having unique contents, gaining those links, communication, hard work and time; these are the factors you need to consider in order to be on the top rank on search engine results.
Computers these days are becoming more than just an avenue to surf the web and do word processing. They are becoming multimedia stations that allow us to watch movies and listen to the latest music. Especially with new solutions such as renting DVD抯 online and pay per download music downloading programs. This is why having good sound on your computer is important for the best possible multimedia experience.
There are two ways you can increase the quality of sound coming from your computer. I will discuss both.
The first would be to upgrade, or get a new, sound card for your computer. The quality of the sound signal being sent from your computer is determined by the sound card. Also the amount of channels that are being sent, and the number of connectivity options you have. This is why having a good quality sound card is important. There are several cards on the market that can deliver a great listening experience.
The second way to enhance your sound quality would be to get a quality set of speakers. There are an infinite number of options you have in this regards. You can get a standard 2 speaker system, a 2.1 speaker system (2 speakers and a subwoofer), a 4.1 system and the ultimated 5.1 system. The most enhancing system would be the 5.1 system.
The 5.1 system consists of 5 speakers and a subwoofer. The subwoofer will deliver the bass and the low frequency sounds. The other speakers would be positioned strategically around the room to give the best array of sounds.
Computers today are not the simple machines they were years ago. They have the capabilities to be a lot more. With this in mind utilizing these capabilities will be very cost effective. Now you do not need to buy a stereo system and a television. A computer can fulfill both these duties.
On 28 of December a severe Windows security flaw, WMF Flaw, was detected, in all Windows versions from Win98 to WinXP, no fixing patch exists yet. Using it, anyone can do any malicious action with your computer, steal or even erase your data.
This article will help you understand what it is and how YOU can fix it until Microsoft releases a patch.
By Washington Post: \”Computers can be infected simply by visiting one of the Web sites or viewing an infected image in an e-mail through the preview pane [...] even if users did not click on anything or open any files.\”
\”Microsoft said in a statement yesterday that it is investigating the vulnerability and plans to issue a software patch to fix the problem. The company could not say how soon that patch would be available.\” http://www.washingtonpost.com/wp-dyn/content/article/2005/12/29/AR2005122901456.html
How severe it is: \”This vulnerability can be used to install any type of malicious code, not just Trojans and spyware, but also worms, bots or viruses that can cause irreparable damage to computers,\” said Luis Corrons of Panda Software.
In a security advisory posted on its Web site, Microsoft confirmed the vulnerability and the associated release of exploit code that could compromise PCs, and listed the operating systems at risk. Windows 2000 SP4, Windows XP, Windows Server 2000, Windows 98, and Windows Millennium can be attacked using the newly-discovered vulnerability…
http://www.microsoft.com/technet/security/advisory/912840.mspx
BlogAutoPublisher support expert comments on the situation, advising a cure:
\”The vulnerability is in the Microsoft Windows Graphics Rendering Engine, that is why the exploit affects Windows versions from Win98 to WinXP.
Unlike other security vulnerabilities, this one allows a _data file_ to execute arbitrary code upon it being viewed. In other words, a (picture) data file can contain executable code to \”help\” Windows display it, and Windows will execute it unquestionably.
Your computer can be infected whenever Windows uses its default image viewer to display certain image types. This means there is a long list of applications that are vulnerable that rely upon the image viewer code. Windows uses this code when previewing images, for example.
*What YOU can do right NOW*, to secure your computer until a patch from Microsoft is released:
Go to Start > Run, paste there the following line: regsvr32 /u shimgvw.dll and press OK.
If everything goes right, you”ll see the following message: \”DllUnregisterServer in shimgvw.dll succeeded.\”
It will disable the problematic dll, forcing all other programs to use their own engines, if exist. Keep in mind that this will disable thumbnail previews in Windows Explorer. One may experience problems with opening any image file after unregistering this dll.
(To reactivate this feature: Start > Run > regsvr32 shimgvw.dll)
We will send another update, when the patch from Microsoft is released, with instructions how to apply the patch and re-activate the feature.\”
And another important thing: since this is such a serious flaw, you may start getting phishing emails pretending to originate at Microsoft, urging you to do something with your computer, apply some \”patches\”. Don”t do it.
Find the true information at microsoft.com or wait for the links at microsoft.com we”ll publish later.
Television tuners allow a user to watch television on their computer monitor. There are several different types of television tuners which we will discuss in this article.
The most common type of television tuner for a computer is the USB television tuner. USB ports are common on all computer so this type of connectivity make it possible to connect the tuner to pretty much any computer.
The television tuner acts just like a normal television would but with the need for a bulky antenna. USB television tuners can receive standard definition, or high definition signals depending of the type of tuner you have.
Most television tuners are bundled with some sort of software. This software allows the user to record the streaming television onto their computer so they can watch programs at a later date. In most cases this software is easy to use and easily setup.
Television tuners are constantly evolving. The newest wave of television tuners allow the user to use two streams from the one tuner. Meaning, you can record one television show while watching another. This is very convenient but at present, only one stream can be recorded and the recorded stream cannot be viewed in conjunction with the non-recorded stream.
Television tuners are a great way to watch television on notebook computers. With the portability of notebook computers, watching television anywhere your notebook can go is possible.
Television tuners can be bought for different prices depending on the quality of the product and the features/software they provide. A simple tuner can be bought for around 50 dollars whereas a more expensive alternative with more comprehensive software will cost upwards of 100 dollars.
With portability becoming more and more of an issue with today抯 consumers, a USB television tuner is a great solution to watching television from your computer.
For many months I had this nagging problem with blogging. I knew that my blogging would never get off the ground and start making me the money I wanted until I solved the problem.
I feel it is pertinent to share this problem in this article with the hope that others that are having similar problem might have a way out.
Want to know what the problem is? It is \”manually\” posting PLR articles (or any such articles) to multiple blogs. I don”t know about you but I would rather automate the process, rather than spend many long hours doing it manually.
You see, I love blogging, but not necessarily for blogging sake, but because it gives me a great way of getting the much needed traffic and high rankings to my multiple other websites.
So, my major aim after I had spent many months studying the power of blogs was to use them, not necessarily as a tool of reaching out to people and sharing my everyday experience or knowledge, but as a tool for pleasing the search engines so they would give me what I wanted – TRAFFIC and GOOD RANKINGS for any site I wanted. Big dreams, right? Of course, but possible to achieve.
So, call me a Blogopreneur and you will be right.
Anyway, as I was saying, I wanted to blog mainly for the money, like many out there are doing (whether they want to admit it or not). I was mainly interested in using blogs and the fact that they are presently Search Engines” favorites to achieve my Blogopreneuristic aims.
First I knew I had to have dozens or even hundreds of blogs. Sadly the process of registering and setting up a single Wordpress blog was a nightmare, to say the least. At first I had to spend many long minutes just to set up ONE Wordpress blog. After a few trails, I knew there had to be a better and faster way. Comon, who has time to spend MANUALLY doing in hours what can be done in minutes effortlessly.
I took my time and researched the market and was able to get special software (yes, whitehat software like WPManagerDX.com, not blackhat software like VoodooBlogger) that helped me create genuine and legitimate blogs in lightening speed.
Second, I knew I needed content for my hundreds of blogs. Note that the fact that I am blogging just for the money didn”t mean I wasn”t going to provide useful content for my readers. Far from it. Let those junk bloggers that fill up their blogs with junk content go ahead, I wasn”t like that. The most important thing on my mind was to provide helpful content that not only the Search Engines would love, but my readers too would love.
The fact that I didn”t want to spend endless hours writing content myself or spend thousands of dollars hiring ghostwriters, I found an easier way out — PLR articles. Whew, what a time-saver, money-saver and life-saver, put together.
So I joined several PLR (Private Label Right) article membership sites and was receiving lorryload of articles each month to use on my blogs.
A little bit about gambling
These days, computers are almost as common in households as telephones. Computers themselves do not cause any threat to individual security. When connected with networks and the chaos that is the World Wide Web, computers have become the tools that identity thieves and hackers use to extrapolate this chaos. In order to establish computer security, software companies have created devices to ward off the hazards and hassles of viruses, spyware, pop-ups and spam.
The first of these creations is anti-virus software. There are two main companies that offer this software: McAfee and Norton. These programs work to scan the files on your computer and check them for attributes that are in viruses or are often linked with viruses. These traits or attributes are often called virus definitions and need to be downloaded on a relatively regular basis. In addition to the files on your computer, files on CDs, floppy discs and e-mails can and should be filed. There is no question on this one: anti-virus software is vital to computer security.
Next on the list is spyware scanning software. Spyware occurs when certain websites run programs in the back ground of your computer while gleaning information from it. The information can be as benign as tracking what type of websites you look at, to actually acquiring passwords. Regardless of the type of spyware, it can slow your computer to a crawl and needs to be removed from your computer. Two popular software options are Spy Sweeper and Ad-ware.
Last, but certainly not least are pop-up blockers and span filters. Not only are pop-ups and spam annoying, but these often contain the spyware scanning software explained above. In addition, they can slow your computer down incredibly. And when you are angry at your computer, your computer is not secure!
In addition to these software items, there are a few more tricks you can use to keep your computer and your information secure. Password secure everything you can, and when you create the passwords, don抰 make them easy. Do not use your name, your birthday or your social security number. And, if you are on an unsecured wireless network, do not check your bank statements. These networks allow several people on them at one time. Remember, hackers are smart. You have to be smarter!
The Art of Shopping the Internet for Freebies and Deals
More and more people are turning to the Internet in order to find deals on all kinds of items they want or need for their homes. Many of the deals and freebies that they come across are not even available in traditional retail stores. The fact that the Web can display so many different item and service options really helps the consumer quite a bit. It makes shopping quicker and more convenient. It also saves retailers money that would be spent moving product from a warehouse to the retail section of a store. In the process of shopping, consumers also find plenty of freebies and deals that are enticing to a customer. Many of these deals are only offered online. The reason they are only offered online is because it is more economical to promote certain deals by way of the Internet versus local stores. Even if a consumer is required to pay shipping charges, online shopping can be cheaper than in-store shopping. The reason why is because a product can be packed and shipped directly from a manufacturer to a person抯 front door. This eliminates the step of unpacking the product and displaying it in a store front-in some cases.
As mentioned earlier, the other huge benefit of online shopping would be that of convenience. Instead of paying to fill up your car with gas to drive to a place to pick an item up you would be paying to have it sent to you. When people shop online they will usually come across several different types of online freebies and other types of special offers. One of the most popular incentives is to offer free shipping of orders greater than a certain dollar amount. Another incentive would be to receive a percentage off of an order booked online, or to receive a free item with an online order. There are several ways to find online shopping promotions, freebies and discounts. You can search individual shopping sites, shopping comparison sites, or online auction sites. You will want to search for vendors who have the highest level of online reputation as possible.
You may able to find freebies and discounts when you search in your web browser as well. For instance, maybe you are looking for 揻ree Karaoke software?for turning your computer into a Karaoke machine. This search will lead you to many choices of Karaoke plug-ins that you would download, along with song files to play. Online shopping also makes it easier for you to receive written software and audio files. You can conveniently order and pay for digital versions of books which you can receive immediately usually for no shipping charge. You can also receive music audio files as well for no shipping charge and you do not need to wait to receive these files. Other items that can be sent to you immediately over the internet in some kind of digital or audio form include sheet music, copies of photos, and more. You may also be able to receive movie tickets immediately online, as well as coupons for items that you can obtain a discount for in participating brick-and-mortar types of stores. Online shopping has opened up a world of opportunity for people. One of those is the advantage of receiving online discounts, freebies, and other Internet promotions.
Very Important: Update on Severe Windows Security Flaw. What To Do Right Now To Secure Your Data
Nov 14
Earlier we warned you about a serious security flaw, so-called \”WMF flow.\” Several days later nearly one hundred different instances of exploitation of this newly discovered vulnerability had been found.
\”Desktop users that suffered the effects of the IMF exploit describe it as a devastating experience to find their desktop computers completely taken over by an attacker.
揥hen it hit, the screen suddenly said, 慍ongratulations, you抮e infected!挃 said Brad Dinerman, vice president of information technology at MIS Alliance, a professional services outsourcing firm in Newton, Mass. It was clear that the computer running XP was no longer in his control.
揑t had root access, it wouldn抰 let me log off or do anything,?Dinerman said. He said he ended up having to re-build the machine from scratch. He noted that his machine had been up-to-date in terms of software patches, anti-virus and anti-spyware software. \”
\”…exploit has so many variants that anti-virus firms are having a difficult time keeping up with the exploit抯 changes in attack code.\”
http://www.networkingsmallbusiness.com/news/2006/010306-sans-microsoft-patch.html
\”It enables clueless newcomers to easily craft highly variable and hard-to-detect variations of image files. Images that take over computers when viewed. And do this on all common Windows platforms. Meaning that there are hundreds of millions of vulnerable computers in the net right now.\”
http://www.f-secure.com/weblog/archives/archive-012006.html
Current news on the situation, by BlogAutoPublisher support expert:
1. An official WMF Vulnerability update from Microsoft is now available. See more info and patches for various flavors of Windows at:
http://www.microsoft.com/technet/security/Bulletin/MS06-001.mspx
Or just go to http://update.microsoft.com/ to pick up the right update automatically.
The patch requires that the PC be rebooted.
2. Microsoft is not fixing Windows 98/ME.
Microsoft has now \”reclassified\” the WMF vulnerability in Windows 95, 98, and ME as non-critical (instead of just fixing it!). This means that it will probably NOT be updated and patched to eliminate the WMF handling vulnerability that those older versions of Windows apparently still have. \”Per the support life cycle of these versions, only vulnerabilities of critical severity would receive security updates,\” the company said.
We urge you to upgrade, if possible, to WinXP which is much more secure and stable Windows version.
3. After applying the Microsoft’’s patch, go to Start > Run, paste there the following line:
regsvr32 shimgvw.dll
and press OK. You should see the following message: \”DllRegisterServer in shimgvw.dll succeeded.\”
All your Windows \”picture viewing\” capabilities are back to normal now.
Wishing you productive and secure 2006, BlogAutoPublisher Team.