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Tuesday, December 31, 2013

Happy New Year 2014

December 31, 2013 No comments

OSI = Open Systems Interconnection

December 25, 2013 1 comment

The OSI Reference Model

It’s simply a model that explain how computers will communicate with each other.

It’s developed by ISO (International Organization for Standardization).

In theoretical terms it helps you understand how networks and network protocols work.

The model has 7 layers, where each layer communicates directly with its adjacent layers.

Layer 7: Application Telnet, HTTP, DNS, FTP etc

Layer 6: Presentation Character code translation, Encryption-decryption, compression

Layer 5: Session Half-Duplex, Full-Duplex

Layer 4: Transport TCP and UDP

Layer 3: Network This is where routers operate. Anything regarding the TCP/IP protocol happens here. Think IP Address, subnet masks, default gateways etc.

Layer 2: Data Link This is where switches operate.

Layer 1: Physical This is the physical stuff connecting computers together (cables, nic, hubs, Ethernet cable, serial, modems etc etc).

Click here to know about TCP/IP Model

Download the Evaluation: Windows Server 2012 R2

December 19, 2013 No comments

Download the Evaluation: Windows Server 2012 R2

Live Migration improvements. Compression during live migration will reduce the time to move the VMs to another server , this feature is the default option on Windows 2012 R2 and it will be a good option when we have some bandwidth limitations. Obviously this feature introduces more workload to the CPU in the servers.

Shared VHDX. In this release Hyper-V will be guest clustering with shared VHDX using commodity storage, additionally it would be resize even when the VM is still running.

Hyper-V replica. This version introduces a third datacenter in the replication scenarios where we can change the replica frequency.

Export and Clone of VMs. Now it is possible to clone or export a running VM from System Center Virtual Machine Manager R2.

Dynamic Memory support for Linux. It has the ability to dynamically expand the amount of memory available to a running VM.

Gen2 VMs. Windows 2012 R2 introduces this feature removing all the legacy, BIOS-based functionality of a traditional VM, some of the benefits will be reduce the size of the VMs and eliminate some of the overhead of legacy BIOS-based. Of course traditional Gen1 will be available too.

Automated storage tiering. Now you can configure SSD drives to be prioritized for application where the latency is very important or use slower disks for applications with less workload.

Storage Quality of Services QoS. Enable consistent SLA delivery and will be configurable while the VM is running.

Update from Windows 8.1 Preview to Windows 8.1

December 19, 2013 No comments

http://windows.microsoft.com/en-in/windows-8/update-from-preview

The preview is no longer available for download. You must install the final version of Windows 8.1 or Windows RT 8.1 before January 2014 when the license for the preview will expire. If you've been using the preview, you should update to the final edition as soon as possible to avoid an interruption in using your PC.