Awesome 50+ iphone Wallpapers

In My this post i have provided Awesome wallpapers for iphone & ipod touch as well.In my this post we cover 3D,Animal,cars,girls and apple wallpapers. All the wallpapers are of 320X480 in Resolution.I think you will like all these wallpapers....

3-D wallpapers

Girls:- These girls are really awesome.

Cars

Animal

Apple
There are some beautiful apple wallpapers.

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Network Topologies (Tutorial-4)

Topology refers to the way in which the network of computers is connected. The choice of topology is dependent upon--- Type and number of equipment being used Planned applications and rate of data transfers Required response times Cost Types of Network Topologies Physical Topology: Physical topology defines how devices are connected to the network through the actual cables that transmit data(physical structure of the network) Logical Topology: Logical Topology (also referred to as Signal Topology) is a network computing term used to describe the arrangement of devices on a network and how they communicate with one another.

Cisco Hierarchical Model

Cisco Hierarchical Model Defined by Cisco to simplify the design, implementation, and maintenance of responsive, scalable, reliable, and cost-effective networks. The 3 layers are logical and not physical – there may be many devices in a single layer, or a single device may perform the functions of 2 layers, eg: core and distribution. The Cisco Hierarchical Model

OSI Model (Tutorial-6)

What is the OSI model ? Open Systems Interconnection model is fundamental to all communications between network devices. Developed in 1974 by ISO after the American Department of Defence began using the TCP/IP suite of protocols. Finally adopted in 1977. It is now the theoretical model for how communication takes place between network devices. What are the seven layers ? Layers OSI Model Layer 7 Layer 6 Layer 5 Layer 4 Layer 3 Layer 2 Layer 1

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