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Computer Networks → Introduction to Computer Networks 25

Which network type connects continents via satellites
WAN
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The internet is an example of
WAN
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Number of connections in full mesh of n nodes is
n(n-1)/2
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In simplex mode communication is
One direction only
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Half-duplex allows
Only one station to transmit at a time
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Walkie-talkies use which communication mode
Half-duplex
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Television broadcasting is an example of
Simplex
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Telephone calls use which mode
Full-duplex
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In full-duplex both stations can
Transmit and receive simultaneously
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Multipoint connection shares the link among
Three or more devices
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Point-to-point connection provides
Dedicated link between two devices
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Jitter refers to
Variation in packet arrival time
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Which characteristic ensures data delivered to correct destination
Delivery
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Manchester encoding uses transitions for
Clock synchronization
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NRZ-I encoding transitions when
Bit is 1
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10Base2 maximum segment length is
185 m
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10Base5 uses which cable type
Thick coaxial
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Attenuation means
Signal weakening over distance
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Single-mode fiber core diameter is approximately
8-10 um
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Multi-mode fiber is best for
Short distances like campus
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Nyquist formula for noise-free channel is
C=2B*log2(M)
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Shannon capacity formula is
C=B*log2(1+S/N)
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Hamming code can both detect and correct
Single-bit errors
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In even parity the parity bit ensures total 1s are
Even
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Checksum is based on
Ones complement addition
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Computer Networks → Wireless Networks 2

Bluetooth is used in which type of network
PAN
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Wi-Fi is an example of
WLAN
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Computer Networks → Types of Networks 1

Data transfer rate typical for LAN is
10-100 Mbps
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Computer Networks → Network Topologies 10

In star topology failure of central hub results in
Network fails entirely
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Bus topology uses a central cable called
Backbone
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Ring topology disadvantage is
Single link failure disrupts network
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Star topology advantage over bus topology is
Individual link failure isolates to one device
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Full mesh topology advantage is
Redundancy with multiple paths between nodes
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In which topology does data travel in one direction in a loop
Ring
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Hybrid topology combines
Two or more different topologies
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Which topology requires the most cable
Full Mesh
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In bus topology a terminator is used to
Absorb signals at ends
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10Base-T uses which physical topology
Star
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Computer Networks → Data Link Layer 2

CRC stands for
Cyclic Redundancy Check
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In CRC non-zero remainder at receiver means
Frame has error
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