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Assume two nodes, A and B, are attached to opposite ends of 100m cable, and that they each have one frame of 1000 bits (including all headers and preambles) to send to each other. Both nodes try to transmit at time t=0. Suppose the transmission rate is 100Mbps, and CSMA/CD with Backoff intervals of multiples of 512 bits is used. After nth collision, A draws K=0 and B draws K=2n-1 in exponential backoff protocol. Ignore jam signal and interframe space and suppose that signal propagation speed in medium is 2*108 m/sec.
a. When does station A detects first collision?b. At what time (in seconds) is A's packet completely delivered at B?
Assume that airliner carries 10,000 kg of those floppies at speed of 1000 km/h over distance of 5000 km. Compute data transmission rate in bits per second of this system?
Modify the hosts file to map www.google.com to yahoo's IP address and try to do a google search. Remove the modification to the host file and repeat.
Determine the expected time to find all users' passwords using dictionary attack? suppose that eight more characters were added to password and that DES algorithm was changed so as to use all 16 password characters.
Assuming that switches user store-and-forward packet switching, what is the total end-to-end delay to send a packet of length L? (Ignore queuing, propagation delay, and processing delay.)
Number of citizens and their actions. Clearly this has privacy, implications. Explain the ethics of developing this type of system.
Suppose that the links and routers in the network never fail and that routing paths used between all source/destination pairs remains constant. In this scenario, does a VC or datagram architecture have more traffic overhead. Why?
Assume nodes A and Bare on the same 10 Mbps Ethernet bus, and the propagation delay between the two nodes is 325 bit times. The answer is no, if B 's signal reaches A before bit time t = 512 + 64 bits. In the worst case, when does B's signal reach A?
You have been hired as independent contractor to support company in designing a new datacenter for its existing complement of 16 Unix servers, 32 Windows servers, and 10 racks of network
Create a communication system (block diagram) which will permit transmission of these four sources over telephone using frequency division multiplexing and TDM PCM assume using 4 bit samples.
Compare the time for a query and response for a complete DNS query and response (to all required nameservers) if M=1, M=2, and M=3.
What are some immediate differences in the two protocols? Does IPv6 provide operational improvement, as well as increased address space?
Assume we can accurately forecast set of WAPs that the taxi will visit. Determine average streaming media data rate that we can sustain by downloading prefetched data from WAPs?
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