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Q1) Consider transferring a large file of L bytes from Host A to Host B. Assume a MSS of 1460 bytes.
a. What is the maximum value of L such that the TCP sequence numbers are not exhausted?
b. For the L you obtained in (a),calculate how long it takes to transmit the file over a 10 Mbps link if to each segment a UDP header and, 46 bytes of network and link layer header information is added.
c. For the L you obtained in (a), calculate how long it takes to transmit the file over a 10 Mbps link if to each segment a TCP header (with no options) and, 46 bytes of network and link layer header information is added. Ignore flow control and congestion control.
Let DES(x, K) represent the encryption of plaintext x with key K using the DES cryptosystem. Prove that y' = c(y) (i.e., if we complement the plaintext and the key, then the ciphertext is also complemented).
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Manager would like to add four servers to network so employees can share files. Manager would also like to permit VPN access for her employees so they can work remotely.
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