Computer Certification

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Getting to Know the OSI Model for the CCNA Exam

The CCNA exam asks you to provide at least three reasons that the "industry" uses layered interconnection models. Examples of layered networking models include the seven-layer OSI model [more…]

Unmasking the Subnet Mask for the CCNA Exam

Subnetting lets you borrow bits from the host and use them to allow for more networks. When subnetting, separating the network and host requires a special mechanism called a [more…]

Installing and Configuring DHCP

If you have worked with Windows NT at all, you are probably familiar with Dynamic Host Configuration Protocol (DHCP) — a server service that enables the server to dynamically assign IP addresses to network [more…]

Moving Objects in Active Directory

Moving objects around in Active Directory may involve moving objects from one location to another within a domain, or you might have to move objects from one domain to another. You need to know the details [more…]

Configuring Access Control in Windows XP Professional

Three considerations exist when you configure access permissions for any given resource on a Windows XP PC. Remember them easily by the keywords which, who, [more…]

CCNA Savvy: Segmenting a Network with a Router

Segmenting a LAN with a router may not be the least expensive way to go, but it does have its benefits. You can expect to find questions on the benefits of segmenting a network with a router on the CCNA [more…]

Security+ Certification: Computer Forensics and Incident Reponse

Computer forensics involves conducting an investigation to determine what has happened, to find out who is responsible and to collect legally admissible evidence for use in a computer crime case. [more…]

Getting to Know the Windows XP Professional Exam

Knowing something about an exam's design can help get you comfortable with the format in advance, so here are a few words on what you can expect to see after you sign in at the test center. [more…]

Examining the CISSP Examination

The Certified Information Systems Security Professional (CISSP) certification examination is a grueling 6-hour, 250-question marathon. To put that into perspective, in 6 hours you could walk about 25 miles [more…]

Test-Taking Tips for the Windows XP Professional Exam

Knowing a few test-preparation tricks can give you a bit of an edge on the exam, so here are ten suggestions that may help rocket you to a passing grade after you've dutifully studied the core material [more…]

Exploring Access Control for Security+ Certification

Access control is the ability to permit or deny the use of an object (a passive entity, such as a system or file) by a subject (an active entity, such as an individual or process). [more…]

Security+ Certification: Shoring Up Your Defenses

Hardening refers to the process of making changes to a computer or network device in order to make it less vulnerable to intruders. This is important because the computers and networks that an organization [more…]

Examining the Windows 2000 Server Exam

Exam 70-215 is a required core exam for the Windows 2000 MCSE track. Before you begin studying for your Windows 2000 Server exam, take time to check out the exam objectives. The list of exam objectives [more…]

Knowing What to Expect on the Windows 2000 Server Exam

The Windows 2000 Server exam, like all other Windows 2000 exams, uses a number of different testing technologies to test your skills. You may see any and all of the following testing technologies on the [more…]

Addressing Typical Windows 2000 Directory Service Exam Concerns

Here are the answers to ten common questions that candidates ask about the MCSE Windows 2000 Directory Services. Use this information to make sure that you are ready for test day. [more…]

OSI for CCNA Layer 3: Network

The CCNA exam covers data packets; the network layer routes data packets across networks that link the sending and the receiving host. In a nutshell, the network layer does the following: [more…]

OSI for CCNA Layer 2: Data Link

The CCNA exam has extensive coverage of data routing. Data routing is handled by the data link layer of the OSI. The data link layer does the following: [more…]

OSI for CCNA Layer 1: Physical

The CCNA exam has extensive coverage of hardware. That's the physical layer. The physical layer provides the electrical, optical, or over-the-air connection between the sending host device and the receiving [more…]

OSI for CCNA Layer 7: Application

The CCNA exam requires knowledge of the OSI reference model's application layer. This layer represents the various network applications such as e-mail reader, Web browser, Hypertext Transfer Protocol [more…]

OSI for CCNA Layer 6: Presentation

As you prepare for the CCNA exam, the presentation layer is mostly concerned with data format. It converts the data between different formats so that both the sender and the receiver can use heterogeneous [more…]

OSI for CCNA Layer 5: Session

As a certified CCNA, you'll work in communications between applications. Some applications need to open logical communication channels between the computer hosts. Logical communication channels [more…]

OSI for CCNA Layer 4: Transport

On the CCNA exam, you'll work with hosts. The transport layer manages the transport of data between two hosts communicating over a network. In a nutshell, the transport layer does the following: [more…]

CCNA All-in-One Certification For Dummies Cheat Sheet

The CCNA exam requires mastery of the OSI reference model. The model is designed in seven functional layers. Each layer has a precise mission, and each layer works fairly independently of the upper and [more…]

Troubleshooting Commands for the CCENT Certification Exam

When problems arise on Cisco devices, there are a number of show commands you can use to help identify what the problem is. The following table lists popular [more…]

Security Best Practices for the CCENT Certification Exam

One of the most important skills to have as a CCENT is the capability of implementing basic security practices on your Cisco devices. The following are some key points to remember about securing devices [more…]

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