2. Suppose two packets arrive to two different input ports of a router at exactl
ID: 3735290 • Letter: 2
Question
2. Suppose two packets arrive to two different input ports of a router at exactly the same time. Also, assume there are no other packets anywhere in the router.
a. Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a shared bus? (10%)
b.Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar?
c.Suppose the two packets are to be forwarded to the same output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar?
Explanation / Answer
a.Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a shared bus? (10%)
Answer)
NO, It is not possible because in the shared bus technology one packet can be transferred at a single point of time. Other packet have to wait in a queue.
b.Suppose the two packets are to be forwarded to two different output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar?
Answer)
Yes, This is possible because crossbar switch allows two packets from input ports to different output ports. Because the two ports are free.
c.Suppose the two packets are to be forwarded to the same output ports. Is it possible to forward the two packets through the switch fabric at the same time when the fabric uses a crossbar?
Answer)
No, it is not possible to forward two packets in the same output port. Because the output port get busy when tramsmitting the second packet at the same time.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.