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802.11 DSSS
a) Direct sequence spread spectrum in a 2.4 GHz band
b) Each bit is replaced by a sequence of bits called a chip code, implemented at the physical layer
c) Sender splits each byte of data into several parts and sends them concurrently on different frequencies
d) Data rate is 1 or 2 Mbps
Post Office Protocol and Lightweight Directory Access Protocol POP: Post Office Protocol is a used by mail clients to download messages from a mail server on the Internet. L
Assume the following 64-bit DES key (expressed in hexadecimal): FEFE FEFE FEFE FEFE (a) What is the term for such a key? (b) State the value of each of the 48-bit round keys
Define the Class B Addresses? First two octets are the network number as well as the last two octets are the host number 16382 probable blocks for assignment to organi
Can you describe RSVP?
Overview Create a prototype web site for the "Computer Superstores" company. Your site should use effective navigation features and demonstrate good structure for accessibility
benz network
QUESTION (a) What are the problems with IPv4 on today's Internet and how does IPv6 solve these problems? (b) Describe at least three ways in which IPv6 is more efficient tha
Explain Asymmetric encryption
1. A computer system has a two-level memory cache hierarchy. The L1 cache has a zero hit penalty, a miss penalty of 5 ns and a hit rate of 95 percent. The L2 cache has a miss pena
DNS Tunneling – Domain Name Server "If, on one system, it is possible to transmit bits to another in any form, and in turn receive a reply as a result of that transmission, th
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