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1) A foreign navy has implemented a secure communications system in which submarine commanders transmit a single 5-letter message every day. The messages may only use capital (English) letters, and all messages are equally probable. A crypto device encrypts each message into 20 bits of ciphertext.
a. What is the entropy of the plaintext message? b. What is the entropy of the ciphertext message? c. Is this a good cryptosystem? Why or why not?
In Lamport'so mutual exclusion protocol, if process i is implementing critical section, Is this still true when there are no messages in transit?
Explain how you would incorporate new servers into environment and how you would address what additional changes might be needed.
Explain how systems analyst can help with project management tasks. Also, explain how new employee can contribute to tasks.
problems of IPV, DNS server software, TCP SYN attack, Ping of Death, Land attack, Teardrop attack, Smurf attack, Fraggle attack
Compute the total time required to transfer a 1000KB file on a 1Mbps link with an RTD of 100msec ans a packet size of 1 KB in the following cases.a).
In second strategy, packets are not acknowledged individually, but the whole file is acknowledged when it arrives. Explain the two approaches.
Using the frequency definition of bandwidth, what should the bandwidth of 10 Mbps Ethernet link be if the signal-to-noise ratio is 20 dB?
Suppose a BGPv4 router receives update for prefix P which indicates AS1 is next hop.
Cathi required to network three computers for herself and her roommates, Sharon and Emily. She decided that a(n) (1)___________________ network was the right kind to install in their dorm suite since a(n) (2)____________________ network was too co..
Users are familiar with some network services like HTTP (Hypertext Transport Protocol) - Web, NNTP (Network News Transport Protocol). How do they figure into organizational security?
Explain role of antennas in transmitting radio waves. What kind of antenna is typically used in wireless LAN?
Take the time to research the various features that were added to the IPv6 protocol (compared to IPv4). Choose one feature and provide a brief explanation of its benefits.
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