CCNA Central

Internet Speed Testing Websites

noreply@blogger.com (Phillip) — Sat, 09 Jul 2011 13:21:53 PDT

A list of internet speed testing websites: Speedtest.net - The Global Broadband Speed Test Test your Internet connection bandwidth to locations around the world with this interactive...

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Subnetting Cheat Sheet

noreply@blogger.com (Phillip) — Tue, 21 Jun 2011 00:39:00 PDT

Subnetting Cheat Sheet For Quick Reference Subnetting is a method of segmenting hosts within a network and providing additional structure hosts within a network and providing additional structure....

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Cisco Network Magic Pro 5.5

noreply@blogger.com (Phillip) — Wed, 15 Jun 2011 12:15:38 PDT

Features Easy to use - No IT Expertise Needed Perform tasks from centralized location An enhanced interface plus new in-product wizards streamline networking tasks, taking the guesswork and effort...

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The Internet Infrastructure and How It Connects

noreply@blogger.com (Phillip) — Mon, 13 Jun 2011 23:39:38 PDT

How The Internet Connects The internet is connected when a user logs into their pc and browse a website by typing in the url. The URL is known as a Domain Name Server; which maps domain names to...

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How to install DD-WRT onto your Linksys Cisco Home Router

noreply@blogger.com (Phillip) — Mon, 13 Jun 2011 10:28:24 PDT

Installation Installing DD-WRT on your Linksys Cisco Router is almost as simple as installing a program onto your computer. The bad part is; if done incorrectly, you can brick your router....

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At-a-Glance: OSI Model

noreply@blogger.com (Phillip) — Thu, 02 Jun 2011 21:45:47 PDT

Why should I Care About the OSI Model?The OSI model serves as a guideline for creating and implementing network standards, devices, and internetworking schemes. Advantages of using the OSI model...

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Quick IP Cheat Sheet used for Reference

noreply@blogger.com (Phillip) — Sun, 24 Oct 2010 23:55:49 PDT

IP Cheat Sheet HostsNetmaskAmount of a Class...

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How Computer Networking Can Benefit a Company

noreply@blogger.com (Phillip) — Sat, 12 Jun 2010 23:03:45 PDT

Technology is advancing at a rapid pace in today’s world. Businesses are constantly in high demands of technicians that understand the ebb and flow of information through technical devices and that...

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Exam Essential: Internetworking

noreply@blogger.com (Phillip) — Fri, 30 Apr 2010 19:32:29 PDT

Know the possible causes of LAN traffic congestion Too many hosts in a broadcast domain/storms, multicasting, and low bandwidth are all possible suspects of LAN traffic congestion. Be able to...

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Where do you take the CCNA Exams?

noreply@blogger.com (Phillip) — Sat, 10 Apr 2010 23:15:06 PDT

You can take the CCNA Composite exam at any Pearson VUE authorized testing centers or call 877-404-EXAM (3926). Follow these steps to register for a CCNA exam: Determine the number of exam you...

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The physical layer, hubs, and ethernet

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:02:53 PDT

The main functions of the physical layer is to send bits and receive bits, as well as state transitions. Bits come in only values of 1 or 0 (morse code with numerical values). State...

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A closer look at the Data-Link layer

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:03:29 PDT

The Data-Link layer provides physical transmission of the data and handles error notifications, network topology, and flow control. Lets take a closer look at it’s function Ensures messages are...

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Six major points of Routers

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:03:51 PDT

There are six major points to remember or keep in mind when working with routers or layer 3 devices. You should probably commit these to memory. Here are the six major points Routers, by...

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A closer look at the Network Layer

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:04:23 PDT

The network layer manages devices addressing, tracks location of devices on the network, and determines the best way to move data, which means the Network layer must transport traffic between devices...

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Visual of Windowing

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:05:04 PDT

Windowing Diagram Window size of 1 = sending machine waits for an acknowledgement for each data segment it transmit before transmitting another segment. Window size of 3 = allowed to...

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Types of flow control and a closer look at Windowing

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:05:29 PDT

The three types of flow control consists of: buffering windowing congestion avoidance A closer look at what windowing is and it's function at the transport layer Windowing ...

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Connection-oriented Communication

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:05:55 PDT

Note: Recall that connection-oriented communications takes place in conjunction with flow control. These communication sessions, in combination of the protocols involved, provide for reliable data...

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Understanding how flow control operates at the Transport layer

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:06:15 PDT

A quick overview of the Transport layer and its function: Reliable networking is used at the transport layer Reliable networking = using acknowledgements, sequencing, and flow...

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Important additional functions of the OSI reference model's upper layers

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:06:43 PDT

Application layer The application layer acts as an interface between the actual applications programs. Example - Microsoft Word – actually does not reside at the application...

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A quick overview of the OSI layers and their functions

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:07:19 PDT

Applications file print message database application services Presentations data encryption compression translation Session dialog control Transport ...

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Facts and notes on the OSI reference model bottom layers

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:08:30 PDT

The bottom layers of the OSI reference model include Transport Network Data Link Physical Functions at each of the bottom layers Transport - provides reliable or unreliable...

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Facts and notes on the OSI reference model

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:09:09 PDT

The OSI reference model has seven layers and is divided into two groups. The top three layers define how the applications within the end stations will communicate with each other and with users. ...

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Advantages of using an OSI reference model

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:09:38 PDT

Advantages of using an OSI model include: Prevents changes in one layer from affecting other layers. Divides the network communication process into smaller and simpler components, thus...

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Tips on network, routers, and switches

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:09:59 PDT

1. Plan your network design carefully. 2. Use network bridge in network to reduce collisions within broadcast domains and to increase the number of collision domains in your network. 3....

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The OSI reference model and it's seven layers

noreply@blogger.com (Phillip) — Sat, 24 Apr 2010 22:10:52 PDT

The OSI reference model has seven layers: Application layer (layer 7) Presentation layer (layer 6) Session layer (layer 5) Transport layer (layer 4) Network layer (layer 3) Data Link...

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