check the right statements about OSI?
it stands for Open Systems Interconnection
it is a nice computer brand
has seven layers
started in 1983 by ITU and then in 1984 presented as layered model by ISO
it is a standard related to the H.W in computer network
in OSI model SAP is between layers in the same systems and protocol is between peer layers in different systems?
in the case of transmitting data which comes first packet or frame ?
packet
frame
in OSI model PDU = PCI + SDU ?
the lower four layers of OSI model called ~~oriented layers ?
transmission
tracking
telecommunication
transport
technical
the higher three layers of OSI model is called ~~oriented layers
programming
application
processing
software
you can have time, frequency, space, code~~
adding
division multiplexing
process multiplexing
forward multiplexing
MAC address is temporary ?
the different between ISO model and Hybrid model is that the upper three layers treated as one layer in Hybrid model and called S.W layers
the number of layers in internet model is
four layers (app. transport, internet IP, subnetwork)
four layers (app. transmission , internet IP, subnetwork)
three layers (app. transport, internet IP)
five layers (app. transport, internet IP, data link, physical)
IP, TCP, UDP protocols are the basis of the internet
Bandwidth is the capacity to carry --
food
information
cars
heat
people
bandwidth could be divided into --
sub bandwidth
channels
network
houses
which are the correct sentences ?
repeater and hub cover only layer one in osi model
bridges and switches cover layers one and two in OSI model
gateway could cover all layers in OSI model
router covers layer four only
router covers layers from 3 to 1
modem covers layers 5 and 6
Bit rate could be higher than Baud rate if No. of signal levels ( V ) is higher than 3
data encoding techniques for Analog signal of Digital single are --- shifting key
amplitude, time, space
amplitude, frequency, speed
amplitude, frequency, phase
time, distance, speed
data encoding techniques for Analog signal of Analog single are
AM, FM, PM
GM, FM, CM
VM, TM, AM
data encoding techniques for Digital signal of Digital single are:
manchester, Nonretuern-to-zero level , Nonretuern-to-zero, invert on ones
AM
time modulation
FM
Nonretuern-to-zero, invert on ones
data encoding techniques for Digital signal of Analog single are:
puls code modulation PCM
amplitude code modulation
frequency code modulation
propagation effect includes the following items
noise
attenuation
filtering
modulation
distortion
interface
digital signal could be compressed but it can't be re-teansmitted
with IP address there is another term
subnet mask
tiger mask
internet mask
application mask
in multiplexing is used we look for either parallel access or
shifted access
avoid accidents between signals
Try to make accidents between signals impossible
time access
there are always two IP addresses reserved to network IP and Broadcast
as an analogy if the multiplexing tech, was the car, what is the operation mode?
gasoline
wheels
AT or MT
The four techniques of multiplexing have be used exclusively
