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Suppose nodes A and B are on the same 10 Mbps Ethernet bus, and the propagation delay between the two nodes is 245 bit times. Suppose A and B send frames at the same time, the frames collide, and then A and B choose different values of K in the CSMA/CD algorithm. Assuming no other nodes are active, can the retransmissions from A and B collide? For our purposes, it suffices to work out the following example. Suppose A and B begin transmission at t=0 bit times. They both detect collisions at t=245 bit times. They finish transmitting a jam signal at t = 245 + 48 = 293 bit times. Suppose KA=0 and KB= 1. At what time does B scheduleits retransmission? At what time does A begin transmission? (Note: The nodes must wait for an idle channel after returning to Step 2, see protocol.) At what time does A's signal reach B? Does B refrain from transmitting at its scheduled time?
Suppose a subnet with prefix 128.119.40.128/26. Provide an example of one IP address (of the form xxx.xxx.xxx.xxx) which can be allocated to this network.
Now that you know more about ConnectSpree's network, you begin drawing a map of its devices and connections, starting with its internal LAN.
Write program to accept a bit string and generates the unipolar, NRZ and Manchester encodings for the bit string. You can use any programming language/platform and generate the output in any appropriate manner.
An entrepreneur is interested in establishing her own world-wide satellite radio infrastructure and has requested your help. Describe and justify the infrastructure that you would develop.
What if private key is unknown? how would rsa algorithm be implemented then? Assume we have the algorithm which knows public key it is able to decrypt small amount of messages?
You and Luke Sky Walker are commanders in rebel army preparing to attack Darth Vader and his Death Star. Is there protocol which you and Luke can use to avoid defeat? If not, describe why not.
Prepare a network simulation
Determine the IP addresses of www.google.com and www.yahoo.com. Modify hosts file to map www.google.com to yahoo's IP address and try to do google search. Remove modification to host file and repeat.
What are some immediate differences in the two protocols? Does IPv6 provide operational improvement, as well as increased address space?
The telephone communication systems and long distances agreements are managed by a telecommunications department in the headquarters that reports to the vice president of finance. Outline pros and cons of both alternatives.
Describe how relative speed of 100BaseT LANs used at each location compares to accessing WAN link between two sites.
Explain in detail how PKCS (Public-Key Cryptography Standard), when combined with the RSA algorithm, can thwart Eve's attempt at discovering the encrypted figure.
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