Network Security: Bit Rate, Channel Capacity, Multiplexing, Demultiplexing, Wireless Technologies

Running Head: Network Security 0
Network
Security
Task
Student name

Network Security 1
Table of Contents
Answer 1.................................................................................................................... 1
Answer 2.................................................................................................................... 1
Answer -3................................................................................................................... 2
Answer-4.................................................................................................................... 2
References................................................................................................................. 4

Network Security 2
Answer 1
1. Bit rate is a transfer of bit per second in the medium.
2. The formula of bit rate is:
bit rate= signal per level * bandwidth
Therefore
Bitrate = 8*3 = 24
3. Formula for the channel capacity is
C = B log2(1+SNR)
SNR = 6 dB
SNRdB = 6 dB = 10 log10(6)  SRN = 4
C = 3*106 x 1og2(1+4) ≈ 8 Mbps.
C= 2 Mbps
4. The data rate is the speed in which data transfer between two nodes and it
can be measured in the bytes per seconds. Channel capacity is a maximum
amount of traffic, which can be transferred over a particular channel
(Tanenbaum).
Answer 2.
1) Multiplexing: it is a way to combine analog or digital signal into one signal
and transfer it over a shared medium. It is necessary to secure the signal
with a high level of frequency and it is also secure the signal from distortion,
attenuation, and noise (Kenneth C. Mansfield and Antonakos).
Demultiplexing: it is a reverse process of multiplexing in which it separates a
combined signal in various signals.
2) 1. Packet switching can further be divided into two subcategories – virtual
circuit approach and the datagram approach.
2. Circuit switching takes places at the physical layer.
3. in packet switching the resources need to be reversed during the setup
phases.