Cybercrime Questions Essay

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Cybercrime Questions Essay

By | November 2012
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1. Why do ATM networks use cell switching?[1]

Answer: This is because Cell Switching is the latest form of virtual circuit switching. In which small fixed sized cells are used instead of variable fixed packets. The small sell size ensures that the delay is predictable due to which the voice quality can be maintained

2. Why is virtual circuit switching critical for ATM networks? (Please list three reasons )[1]

Answer:
a. packets or frames oriented.
b. variable size packet or frames.
c. relatively slow, but better resource utilization.

3. What are the "adaptation layers"? Are they in the switches? Are they in the end-hosts?[1]

Answer: Convergence Sublayer (CS) and the Segmentation and Reassembly Sublayer (SAR). AAL types: AAL1, AAL2, AAL3/4, AAL5, AAL0
AAL classes: class A, class B, class C, class D
Yes ! they are in the switches.

4. Is it practical to build a large (i.e., with lots of ports) input buffered ATM switch with fast links? Why or why not?[2]

Answer: yes, it is practical with fast links, switches can be built using smaller input-buffered ATM switches. Low cost networks can be used in very high-speed input-buffered ATM switches. Why? Because In an ATM network, cells belonging to a connection can possibly go through several switches. At each switch, cells of a connection are routed to the desired output by the switches using the VCI information. For traffic switching, many types of switching fabrics have been proposed for use in ATMnetworks. These include crossbar switches, input buffered switch, output buffered shared memory switch, and multi-stage switching fabrics.

5. Is it practical to build a large (i.e., with lots of ports} outputbuffered ATM switch with fast links? Why or why not?[2] Answer: yes, it is practical with fast links, switches can be built using smaller output-buffered ATM switches. Low cost networks can be used in very high-speed input-buffered ATM switches....

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