Alicisco

ISL vs Dot 1Q

noreply@blogger.com (Anonymous) — Mon, 20 Sep 2010 17:45:00 +0000

ISL:
ISL is Cisco Proprietary, not usable in multivendor environments. IT will encapsulate the entire frame and place both header and trailer onto the frame, which will increases the overhead on trunk line. Because ISL does not use the concept of native Vlan (Vlan 1 Default in Cisco switches), every single frame transmitted across the trunk will be encapsulated. ISL adds 26-byte header, which contains Vlan ID and adds 4-byte trailer contains CRC value.
Frames larger then 1518 byte (Max size for Ethernet frame) called GIANTS. ISL encapsulation adds 30 byte to the original frame, which makes them too large for the switch to handle.

Dot 1Q:

Dot 1Q is the IEEE standard suitable for multivendor. Dot1Q does not encapsulate frame, it just adds 4-byte header to the frame and adds nothing to native Vlan frames. Adding only 4-byte to the frame results less overhead then ISL .Maximum frame size of 1522.

Run Linux and Windows simultaneously

noreply@blogger.com (Anonymous) — Mon, 03 May 2010 17:22:00 +0000

If you are a Windows user and Want to switch or just try Linux. But you don’t want to take a risk of dual boot or you don’t have an extra testing computer.

You can run booth of your Operating systems simultaneously. So you can get use to your new OS while using your current OS (Windows). And that by using your Windows as host and your new OS(Linux) as guest .

Things you need :
1- Desktop or Laptop with at lest 1.8 Ghz processor
2- Extra Monitor (to create dual monitor)
3- 3 GB of Ram at lest.
4- 2GB Flash memory
Software you need:
1- Linux ISO image (Ubuntu, fedora,Opensuse) what every you like.
2- eBooster (converts the Flash memory to Ram) and I don’t care how you get it buy it or ……
3- VirtualBox it is free (www.virtualbox.org) download Windows host version.
4- virtual-box-windows-guest-additions-installer Its also free (http://code.google.com/p/virtual-box-windows-guest-additions-installer/)
steps
1-First you set your dual monitor and to do that just connect your Old monitor to your laptop. If you are using windows 7 Right clickScreen Resolution Detect. Set the Multiple displays to (Extend this displays).
2- Install eBooster and after you finsh connect your flash memory and right click ReadyBooster set the amount of space you want to use (prefer 1024).
3- Install VirtualBox.
4- configure your VirtualBox and create new virtual pc (linux).
5- after you finshed installing your new OS (linux) install the virtual-box-windows-guest-addition inside your virtual pc.
6- now you can run your primary OS in one screen and the virtual OS in other.

Enjoy your both Operating systems

fill free to ask any question about any step you don't understand and I will give a detailed instruction.
or email me ali.2011@live.com

CCNA Certification: Trunking Concepts Part II

noreply@blogger.com (Anonymous) — Sat, 05 Dec 2009 18:03:00 +0000

CCNA Certification: Trunking Concepts Part II

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CCNA Certification: VLAN Trunking Protocol (VTP) Part I

noreply@blogger.com (Anonymous) — Sat, 05 Dec 2009 18:02:00 +0000

CCNA Certification: VLAN Trunking Protocol (VTP) Part I

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Tour of the Cisco Networkers booth in the World of Solutions Brisbane

noreply@blogger.com (Anonymous) — Fri, 09 Oct 2009 09:50:00 +0000

The agenda of the Cisco Networkers event in Brisbane is getting close to one of the most anticipated parts tonight - the customer appreciation event… There’s been a lot of speculation about who the band will be - and we look forward to your guesses on who that. In the meantime, we visited the World of Solutions area today with Andrew Erratt, director of Systems Engineering, Cisco ANZ, to get a view of what attendees can expect to see in terms innovative solutions from Cisco and 40 of its partners.Read More

Cisco Developer Contest – The Winners!

noreply@blogger.com (Anonymous) — Fri, 09 Oct 2009 09:48:00 +0000

On October 14th, 2008 we announced the Cisco ‘Think Inside the Box’ Developers contest with an objective to educate our application developer community on the power of the network as a platform for enabling innovation. The response to this contest was phenomenal. With over 900 registrants and 110 qualified teams submitting proposals in Phase-1, to the challenge was to narrow the list down to ten finalists who got a chance to develop applications on the Cisco Integrated Services Router’s Application Extension Platform.Read More

Other CCNA jobs in Conyers, GA | Get CCNA Jobs

noreply@blogger.com (Anonymous) — Fri, 11 Sep 2009 13:44:00 +0000

Other CCNA jobs in Conyers, GA | Get CCNA Jobs

VMWorld Starts Today!

noreply@blogger.com (Anonymous) — Fri, 11 Sep 2009 13:10:00 +0000

Today, VMWare kicked off its user conference VMworld in San Francisco, where they expect more than 10,000 customers to attend and learn about the latest virtualization technologies from many different vendors.Read More

Warner Music + Cisco = Next-Generation Online Music Experience

noreply@blogger.com (Anonymous) — Sat, 15 Aug 2009 10:15:00 +0000

In a bicoastal media event earlier today, Cisco Chairman and CEO John Chambers, and Edgar Bronfman, Jr., Chairman and CEO of Warner Music Group (WMG),Read more

Change is Challenging - A Perspective on Cisco’s New Management Structure

noreply@blogger.com (Anonymous) — Sat, 15 Aug 2009 10:15:00 +0000

You may have seen a recent Wall Street Journal article on Cisco’s new management structure.Read more

Intranets and Extranets

noreply@blogger.com (Anonymous) — Sat, 15 Aug 2009 09:42:00 +0000

Intranet and Extranet are the most common terms in business networking.They are not actually descriptions of network type. Instead, they describe methods of accessing a network.
Intranet is a private Transmission Control Protocol/Internet Protocol (TCP/IP). using Intranet in an organization will only allow internal members to access the network. for example setting a web server which host internal information in organization, Which will only allow the employees of the company to access.

Extranet is a access method that allow a connection between Internet and Intranet. For Example the company has a remote users, who wants to access the internal resources of the company, they can access using Extranet, but there should be a authentication process like a user name and password.

Nokia Middle East and Africa - Nokia N97 - Products

noreply@blogger.com (Anonymous) — Wed, 29 Jul 2009 20:12:00 +0000

Nokia Middle East and Africa - Nokia N97 - Products

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Packet Tracer 5.2

noreply@blogger.com (Anonymous) — Tue, 28 Jul 2009 19:18:00 +0000

Download latest version of Packet Tracer 5.2 Beta

Download here

Session Layer

noreply@blogger.com (Anonymous) — Sat, 25 Jul 2009 10:37:00 +0000

Layer 5, session layer, allows two applications on different computers to open, use, and close a connection called a session. (A session is a highly structured dialog between two workstations.) The session layer is responsible for managing this dialog. It performs name-recognition and other functions, such as security, that are needed to allow two applications to communicate over the network.
The session layer synchronizes user tasks by placing checkpoints in the data stream. The checkpoints break the data into smaller groups for error detection. This way, if the network fails, only the data after the last checkpoint has to be retransmitted. This layer also implements dialog control between communicating processes, such as regulating which side transmits, when, and for how long.
What is session layer?

Next Lesson-->

Presentation Layer

noreply@blogger.com (Anonymous) — Sat, 18 Jul 2009 08:38:00 +0000

The main functions of Presentation layer are (Data encryption, Compression, and translation services). Presentation layer ensures that data transferred from the Application layer of one system can be read by the Application layer of another one. Some Standards protocols used for tasks like data compression, decompression, encryption, and decryption.

Next lesson--->

Application Layer

noreply@blogger.com (Anonymous) — Thu, 16 Jul 2009 18:32:00 +0000

The application layer of the OSI model marks the spot where users actually communicate to the computer. Layers protocols serve as service provider to user application and workstations. Operations, such as electronic mail, file transfer, name servers, and terminal services are provided in this layer.
Some of the layer protocols:
1- TELNET
2- TFTP (Trivial File Transfer Protocol): Simple file transfer services
3- FTP (File Transfer Protocol): For more elaborate file transfer services
4- SMTP (Simple Mail Transfer Protocol): For message transfer services
5- DNS (Domain Name System): For name server operations
6- SNMP (Simple Network Management Protocol): For network management
7- HTTP (Hypertext Transfer Protocol): For transfer of Web traffic

• Function:
– Network virtual terminal (remote login)
– File Transfer, Access, & Management
– Mail Service
– Directory Service (distributed database & access)

Next Lesson>>>

Lesson 1:changing router name

noreply@blogger.com (Anonymous) — Mon, 13 Jul 2009 08:00:00 +0000

In this video you can learn how to change the router name from the command line interface of the router follow the steps, to change the router name to any name you want.

2009 Technology of the Year: Networking and Security | Networking - InfoWorld

noreply@blogger.com (Anonymous) — Sun, 12 Jul 2009 20:17:00 +0000

2009 Technology of the Year: Networking and Security | Networking - InfoWorld

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Cisco to expand mobile collaboration features | Mobilize - InfoWorld

noreply@blogger.com (Anonymous) — Sun, 12 Jul 2009 20:15:00 +0000

Cisco to expand mobile collaboration features | Mobilize - InfoWorld

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Google's next target: Unified communications | Networking - InfoWorld

noreply@blogger.com (Anonymous) — Sun, 12 Jul 2009 20:14:00 +0000

Google's next target: Unified communications | Networking - InfoWorld

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Cisco charts new path with Eos media platform | Networking - InfoWorld

noreply@blogger.com (Anonymous) — Sun, 12 Jul 2009 20:13:00 +0000

Cisco charts new path with Eos media platform | Networking - InfoWorld

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100 Essential Skills for Geeks

noreply@blogger.com (Anonymous) — Fri, 10 Jul 2009 20:44:00 +0000

100 Essential Skills for Geeks

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Boost Your Certification Study Efforts on the Cisco Learning Network

noreply@blogger.com (Anonymous) — Thu, 09 Jul 2009 19:30:00 +0000

Where can you find great Cisco certification resources—including fun learning games, exam prep study materials, and access to Cisco-savvy colleagues?
Read more

Final Notice: Retired CCNA Certification Exam Availability Ends July 31, 2009

noreply@blogger.com (Anonymous) — Thu, 09 Jul 2009 19:23:00 +0000

The INTRO (640-821), ICND (640-811), and CCNA (640-801) certification exams (all language versions) will no longer be available to Networking Academy students after July 31, 2009. Vouchers for these exams must be used before July 31, 2009 and cannot be exchanged.
For information about accessing these certification exams and exam vouchers, please review the FAQs.

If you have questions after reviewing this information, please contact your local Networking Academy representative for assistance.

ch1:lesson2: Why using OSI model?

noreply@blogger.com (Anonymous) — Sat, 04 Jul 2009 19:30:00 +0000

The purpose of OSI model is to allow different vendors' network to interoperate, for example, they enable us to transfer data between UNIX hosts and Windows host.
OSI model is a layered approach of network communication. The processes of affective communication are divided in logical groupings, which call layers. When communication system is designed in this manner, it's known as layered architecture. As we go through these layers you will notes that they are related to each other.

Advantages of OSI model reference model:
1- It provides guidelines that application developers can use to create new applications which can be run over the network.
2- Provides a framework for creating network standards, devices, and internetworking schemes.
3-It prevents changes in one layer from affecting other layers.

OSI has seven layers; these layers are divided into two groups.
1- The top three layers (Application, Presentation, Session), these layers define how the application within the end stations will communicate with each other and users.
2- The bottom four layers define how data is transmitted end to end.

from http://thenewboston.com

In next lesson will talk about each layer in details.

Next lesson