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TWO DIFFERENT KINDS OF TOPOLOGIES:
LOGICAL TOPOLOGY:
It is described by the specific network technology.
PHYSICL TOPOLOGY:
It relays on the wiring scheme.
NETWORK INTERFACE CARD AND WIRING SCHEMES:
Figure
To allow modifying the wiring without modifying the interface hardware, NICs support multiple wiring methods. it is given in the figure below.
A modified NRZ code known as enhanced-NRZ (E-NRZ) operates on 7-bit words; inverting bits 2,3,6 and 7; and adding one parity bit to each word. The parity bit is chosen to make the
Troubleshoot and Correct VTP and Configuration Errors When all errors are corrected, you should be capable to ping PC4 from PC1, PC5 from PC2, and PC6 from PC3. You should also
Question: (a) Suppose that you are a communication engineer and you have to construct a mobile telephone network with bandwidth W = 4.2 MHz in each link. The data rate is
Consider a signal x(t) = 10 cos(2πfct + 4 cos 2πfmt). Assume frequency modulation. The message frequency fm = 2:3 kHz. Calculate the modulation index and find the bandwidth when
Q. What is Two Types of Errors? Single-Bit Errors: Merely one bit in the data unit has changed Burst Errors of length 'n': 2 or more bits in the data unit have changed (
As there will be more devices there will be more traffic of information. We can include capacity to WAN by adding more links and packet switches. Packet switches use not have compu
what is protocol?
what is cryptography
802.11g OFDM a) Uses OFDM with same 2.4 GHz band b) Achieves a 54-Mbps data rate c) Works with same 802.11b equipment
FAULT TREE ANALYSIS Reliability engineering, in a nutshell is concerned with failures. How failures occur, how often they occur, and how to minimize them are the basic proble
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