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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
What are firewalls? Firewalls serve to protect an internal network from external attacks. These external threats can be hackers who need to steal data or computer viruses that
Routing Principle The principle criterion of successful routing is of course correctness but it not only criterion. You might prefer to take the most direct route ( the one
Distance covered, Based on size, ownership and physical architecture - LAN (Local Area Network) - Suitable for smaller geographical area - MAN (Metropolitan Area Network) - S
Control This field defines 6 different control bits or flags. These bits enable flow control connection establishment and termination connection abortion and the mode
ACK Received If an ACK is received by the sender. The SR sender marks that packet as having been received by the receiver.
TPC and UDP are 2 layer of Transport protocols.
A statistical encoding algorithm is being considered for the transmission of a large number of long text files over a public network. Part of the file content is as follows: DOD
Wireless Access Wireless access connecting end systems ( that are often mobile) into the network. Today there are two broad types of wireless internet access(1) wireless an
OBJECTIVES After reading this unit, you should be able to: Describe the basics of parallel programming; Explain the parallel programming based on message passing;
Operating system for Server Since 1994, when the original pair of web servers - NCSA HTTPd and CERN HTTPd , were proposed, dozens of commercial and shareware programs have
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