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Switching via memory
Traditional computers with switching between input and output being doen under direct control of the CPU input and output ports functioned as traditional I/O devices in a traditional operating systems. Aninput port with an arriving packet first signalled the routing processor. The packet was then copied from the input port into processor memory. The routing processor then extract the destination address from the heard looked up the appropriate output port in the forwarding table and the packet to the output buffers. Note that if memory bandwidth is B packets per second can be written into or read from memory them the overall forwarding throughput ( the total rate at which packets are transferred from input ports to output ports ) must be less than B/2.
To accept its goals, ATM uses fixed, small sized packets known cells. Every cell has 53 octets. VPI/VCI fields shows the cells destination. PRIO say if cell can be discarded CRC
Question 1: a. What is xDSL and enumerate the benefit of such a technology? b. Name some of the typical applications of xDSL and the different types and standards of xDSL.
OpenMP is a compiler directive based standard developed in the late 1990s jointly by a group of main computer hardware and software vendors. It is portable across a lot of popular
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Name the categories of Multiplexing? There are three categories of multiplexing a. Frequency Division Multiplexing (FDM) b. Time Division Multiplexing (TDM) i. Sync
Checksum This 16 bits field contain the checksum. The calculation of the checksum for TCP follows the same procedure as the described for UDP. However the inclusion
Connections in ATM are known virtual circuits or virtual channels These are known virtual, since connections are created in ATM by starting values in memory locations (tables) in A
Q. Show the application layer of Osi reference model? - The application layer is OSI layer that is closest to the user. - It offers network services to the user's applicatio
Explain the different asymmetric algorithms?
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