IT-110 Assignment4-.docx
1. Classify different Secondary Storage Devices?
- Technology used to store data
- Capacity of data they can hold
- Size of storage device
- Portability of storage device and
- Access time to stored data.
2. Explain about the different I/O Techniques?
direct control: CPU controls device by reading/writing data. Lines directly polled I/O : CPU communicates with hardware via built-in controller;
busy-waits for completion of commands.
interrupt-driven I/O: CPU issues command to device, gets interrupt
on completion
direct memory access: CPU commands device, which transfers data
directly to/from main memory (DMA controller may be separate
module, or on device).
I/O channels: device has specialized processor, interpreting special
command set. CPU asks device to execute entire I/O program
3. Describe TCP/IP Network Model with diagram and explain its Layers.
OSI Reference Model and TCP/IP Model Layers
The TCP/IP architectural model has four layers that approximately match six of the seven layers in the OSI Reference Model. The TCP/IP model does not address the physical layer, which is where hardware devices reside. The next three layers—network interface, internet and (host-to-host) transport—correspond to layers 2, 3 and 4 of the OSI model. The TCP/IP application layer conceptually “blurs” the top three OSI layers. It’s also worth noting that some people consider certain aspects of the OSI session layer to be arguably part of the TCP/IP host-to-host transport layer.
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