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COMP20320 Computer Networking
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Consider sending a message over a path with intermediate nodes in a circuit switched network and in a (lightly-loaded) datagram packet-switched network. The propagation delay is 2.147 micro-seconds (us) per hop and the data rate at each node is (Mega bits per second). Suppose the packet size is .
Assume that the packet headers can be ignored in the packet-switched network and it is lightly loaded (in other words, the queueing delays in each intermediate node are zero).
How big does the circuit setup time have to be in for packet switching to be the same or quicker than circuit switching. Round your answer if needed.
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Consider a protocol with a bit rate of and has a length of . The speed of propagation is given by and the packet size is . How many packets would be sent at the transmitter before the first bit is received at the receiver? Round your answer if needed to make an integer.
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Consider a 15 milli-second (ms) round trip time and no congestion. The 76 KB 66 KB is . How many transmissions does it take to send ?
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Consider the diagram showing A, B and C. Link 1 has a length and allows packets to be propagated at a speed of , while Link 2 has a length and allows packets to be propagated at a speed of . Link 1 has transmission rate and Link 2 has transmission rate A -----L1----- B -----L2----- C
Node with and then it sends another packet immediately after it pushes all bits of P1 onto Link 1. When will Node C receive the last bit of P2 in microseconds (us)? Round your answer if needed.
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Consider a Maximum Segement Size (MSS) . The Threshold is Receiver's Advertised Window (RAW) . What is the after the transmission.
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Select all the correct statements
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Consider the IP address that uses a subnet mask of
How many subnets are available
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Select the correct statements
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Consider three flows (F1, F2, F3) sending packets over a single link. The sending pattern of each flow is described by how many packets it sends within each one-second interval. The table below shows these numbers for the first ten intervals. A perfectly smooth (i.e., non-bursty) flow would send the same number of packets in each interval, but our three flows are very bursty, with highly varying numbers of packets in each interval. Time(s) 1 2 3 4 5 6 7 8 9 10 F1 1 8 3 15 2 3 21 54 3 4 F2 6 2 5 5 7 58 9 3 34 5 F3 63 34 15 5 7 9 28 5 3 34
What many times bigger is the Sum of the Peak rates divided by the Peak rate of the Aggregate Flow. Write you answer to one decimal place and round it if needed.
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Consider the diagram showing A, B and C. Link 1 has a length 2.5Km and allows packets to be propagated at a speed of 250 x 10^6m/sec, while Link 2 has a length 5Km and allows packets to be propagated at a speed of 250 x 10^6m/sec. Link 1 has transmission rate 320Mb/s and Link 2 has transmission rate 200Mb/s A -----L1----- B -----L2----- C
Node A sends a packet P1 and then it sends another packet P2 with 1200B immediately after it pushes all bits of P1 onto Link 1. What is the biggest size for P1 in Bytes such that there is no queueing delay at Node B?
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