Vídeo Aula – DNS (Domain Name System)

Vídeo Aula sobre DNS (Domain Name System) realizada para disciplina Sistemas Multimídia do curso de graduação de Ciência da Computação da Universidade Nove de Julho. Produzido pelos alunos do 7° semestre: Daniel Stanzani (câmera, som, gráficos, edição) Julie Bertoletti (Atriz, Adaptação do Roteiro, Cantora-trash) Thiago Arroyo (Voz, Edição, Adaptação do Roteiro) Victor Leandro (Apresentador, Adaptação do Roteiro) Professor orientador: Oswaldo Florio

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Frequently Asked Unix System Administrator Interview Questions

A UNIX system administrator is a person who manages the multi-user computer system in an organization. He or she supports, monitors, tests and troubleshoots hardware and software problems. They also install new software releases, upgrade the system, perform procedures to prevent the spread of viruses, evaluate and install patches and resolve software related problems.

An interview is a recruitment process in which an interviewer asks questions related to the job from an interviewee. It is a two way communication process. Given below are some common interview questions that come up again and again during interviews for this post.

1. What do you understand by semaphore?
A semaphore is a kind of inter process communication resource which is used for synchronization and mutual exclusion between any two asynchronous processes.

2. How will you define a COM?
COM is the short form for Component Object Model. It is a Microsoft platform for software components which is used to enable cross-application communication and dynamic object creation in any programming language that supports the technology. COM is often used in the software development world as an umbrella term that encompasses the OLE, ActiveX, COM+ and DCOM technologies.

3. What do you mean by UNIX?
UNIX developed by Ken Thompson and Dennis Ritchie in 1969 by a group of AT&T employees at Bell Labs. It runs on a range of computers from microprocessors to the largest mainframes.

4. Define some of the functions of a kernel?
The kernel is a part of the Operating System that interacts directly with the hardware of computer, through device drivers that are built into the kernel. It provides set of services that can be used by programs, insulating these programs from the underlying hardware. A kernel is responsible for managing computer memory, allocating resource of the computer, controlling access to the computer, maintaining file system and handling interrupts and errors.

5. What skills will you bring to our organization?
Well, I am familiar with Sun, Solaris and Cisco Hardware, TCP/IP, Jumpstart, VERITAS Volume Manager, C-shell, Perl Oracle 8i, My SQL, Solaris Production, Apache, Sun Server, UNIX and Linux.

6. What occupation specific tasks have you undertaken in your previous organization?
In my previous organization I used to monitor and tune system, develop and maintain the documents, library and procedural documents and install and configure the modem, routers, hubs and LAN terminal servers.

These are some of the important interview questions that are frequently asked. Do not forget to say “thank you” to the person or people who interviewed you.

21 Install and Configure Domain Name System (DNS) on Windows Server 2003 for Internal Website

The resolution of names through the use of Domain Name System (DNS) is central to Windows operation. Without proper name resolution, users cannot locate resources on the network. It is critical that the design of the DNS namespace be created with Active Directory in mind and that the namespace that exists on the Internet not conflict with an organization’s internal namespace. Sorce: support.microsoft.com

Domain Name System DNS Tutorial

Which Server Operating System is Ideal? Unix or Windows

One person has decided to create a website. What is the foremost thing he requires first? It is surely web hosting. Besides other miscellaneous things, like cost and features, he has to make a choice between which servers he has to prefer: Is that Windows (NT, 2000 or XP) or UNIX (Linux, FreeBSD, OpenBSD, etc.).

If one measures them on the basis of their merits. The inference will be a least difference. But in case a user gives the priority to stability, or ease of use, UNIX based servers wins the race. Generally, Windows servers are preferred, as they need not to be rebooted in continuous occasions and are easier to administer and use. It is obvious for many beginners to be in dilemma over the pros and cons of the different operating systems. UNIX’s prime drawback is using a command line interface for administration, which is similar to original MS-DOS interface creating a head ace for a beginner. Also, updating of kernel and software at regular time period is essential for the stability of a UNIX machine, which is far harder than Windows. It can be tackled to work swiftly, if the user’s web host possesses good administration software.

If a person is using scripting, he has to consider once more while choosing an operating system. If the answer is yes, then the next question will arise i.e. what sort of? For example, if one should has decided to go along with PERL language to create a dream, dynamic site, then it is recommended that he/she must go for UNIX operating system. Above statement is also accurate for the languages like PHP, and Pythlon. But if one selects an ASP based site then nothing can be the best choice than Windows. However, to worse the matter further some UNIX systems can give the choice of ASP scripts in them, though the class of the script implementation is adversely affected.

One should need to maintain the software with patches from Microsoft’s website at least once in a week to prevent it from being exploited, if he/she is using a Windows-based web server (because it does not come in the category of host’s responsibilities).

UNIX administrators will only have to do it on the monthly basis only or one can say that UNIX is quite adapted to such conditions.

At the end one can say that both the operating systems (UNIX and Windows) have there own merits and both have the potential to satisfy the customer. But one should not ignore the operating costs and likewise other aspects before coming to any form of inference.

Domain Name System How To: Intro to Domain Name Records with Examples

www.netgonian.com – Shows how domain name records get people to a web site.

Resolving ?STOP: 0×00000101? in a Windows Server 2008-Based System

Multiprocessing in a computer system is done to to run more than one program at the same time. This enables you to get the maximum results out of your system in a shorter time. Although multiprocessors systems are well known for their reliability, but they are no exception, when it comes to corruption. Sometimes, you may encounter system crash problems on a multiprocessor system. After which, the system prompts a STOP error message causing the system to become unbootable. The situation worsens as the data stored in the hard drive gets inaccessible. But, you need not worry as a healthy and valid data backup file can still be used to restore your data. However, if the backup is absent, incomplete, or corrupt, then you need to use specialized Hard Drive Recovery services.

For instance – At times, when you use multi processors on a Windows Server 2008-based system, the system may crash followed by the below mentioned STOP error message:

“*** STOP: 0×00000101 (Prameter1, Prameter2, Prameter3, Prameter4) 
CLOCK_WATCHDOG_TIMEOUT “

As a result of this error message, the system becomes unbootable and the hard drive data becomes inaccessible. Furthermore, this STOP error occurs each time you try to boot your system.

Cause:

A Windows Server 2008-based system encounters this problem because of a race condition in the system Interprocessor Interrupt (IPI) mechanism.

Resolution:

Consider the following measures to resolve the problem:

This problem can be resolved by installing the hotfix solution provided by Microsoft. After applying the hotfix, you will have to restart your system.

However, if the problem persists even after applying the hotfix, then it is highly recommended to go for Hard Disk Recovery solutions. Hard Drive Data Recovery is performed by extremely talented and proficient experts who ensure safe and accurate recovery of data under the sterilized environment of Clean Rooms. In case of physical damage of the hard drive, these experts repair and replace the damaged components of the hard drive to retrieve your data. When data loss occurs because of logical reasons , the data recovery experts use high-quality data recovery software to recover your data.

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Rectifying the ‘NTLDR is missing’ error in Windows Server 2003 system

NTLDR (NT Loader) is the most essential file that is needed by the Windows NT (Server 2003, XP, and Server 2000) systems to boot. It is run from the primary hard disk drive and contains the main Boot loader. The well-being of NTLDR is very significant for the boot process as if this file is missing, then your system would not be able to boot.

The NTLDR file may get missing or corrupted due to various reasons, such as virus infections, power outages, damaged operating system, etc. In such cases, you should consider taking appropriate corrective measures to rectify the problem. However, if you are unable to resolve the issue then you should use a third-party Windows hard drive recovery software to do the needful.

Consider a scenario wherein you have a Windows Server 2003 system. When you start the system, it fails to do so. An error message is displayed, that is:

“NTLDR is missing

Press any key to restart”

Cause:

For the aforementioned error message, there are following reasons:

The BIOS settings of the system are outdated

Any or all of the following files are either corrupted or missing:

boot.ini

Ntdetect.com

Ntldr

Resolution:

To resolve your computer system from the aforementioned problems and access the Windows system, you need to perform the following methods:

Check the BIOS settings: Verify the BIOS settings and check if the latest version of the BIOS is installed on your computer.

Repair the Windows repair environment: Repair the Windows repair environment if any of the aforementioned files is missing or damaged. You can perform it by using any of the following methods:

By using a boot disk that contains all the mentioned files.

By using the Recovery Console to copy the mentioned files to your computer.

By using the Windows Server 2003 CD-ROM to repair the Windows Startup Environment.

The problem will be resolved using the aforementioned methods. However, if you are still not able to address the issue then you should use a third-party Windows hard drive recovery software to do the needful. Such read-only tools are able to recover the hard drive contents without overwriting the original contents.

Stellar Phoenix Windows Data Recovery is a hard drive recovery software that enables you to recover lost, deleted, or formatted volumes. It is able to recover trapped data from all sorts of data loss situations. This hard drive recovery tool is competent enough to recover more than 185 different file types from various storage media such as hard disks, external hard drives, iPods, etc. It is compatible with Windows 7, Vista, Server 2003, XP, and Server 2000.

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