quiz questions Flashcards
which of the following is not part of a computer network
a. users exposed
b. devices appearing as a single network
c. autonomous set of devices
d. interconnect set of devices
ans: b
single network is for distributed system/network NOT computer network
if collision happens n times in a row in ethernet, how many time slots to wait?
ans: 0 to (2^n)-1 time slots
u can send more info in wireless transmission when
frequency is high, wavelength is small
a (value) in p-presistent indicates
- probability is (value)
2. it defers with = 1-(value)
what is the phase of the signal in radiant
pi
given RTT, find min frame size in FAST ethernet
trans delay = frame size/ 100Mbps = RTT
= RTT * 100 = frame size (bits)
which layer in OSI recovers a large file that stopped downloading
session
change in a short span of time means
low period
in OSI which layers are responsible for flow control
data link and transport
you have A B C D in a packet, what do A and C represent
C = source's LOGICAL address A = router's physical address
interface is between layers of
the same stack
from SENDER’s side, message is sent from which layers
layer 7 to 6 (top layer to one below)
block waiting for incoming message is which system call
RECEIVE
which is true regarding TCP/IP and OSI
- in OSI, network layer is either connection oriented or connectionless
- in TCP/IP, transport layer is either connection oriented or connectionless
- OSI is better for new networks
how many layers operate in OSI’s subnet
3
network
data
physical
you watching tv, it rains and tv starts buffering, why?
because the radio wave signal is HIGH
when u send a text, message is translated into electrical impulses before it is converted to radio waves, whats responsible for that?
antennas
find rtt when u have bandwidth and data rate
data rate * RTT = how much can be fit in pipe (num. of bits)
routing algorithms are used to find
OPTIMAL path from source to destination
which transmission tech large networks use
P2P
LAN’s restriction of size means they can be used for
protocol testing
which is more sensitive to delay
a. voice over IP
b. surfing web
c. downloading file
d. sending mail
e. uploading file
most sensitive is voice over IP
THEN surfing web
a fibre optic connecting network in same building has (in terms of latency and bandwidth)
high bandwidth
low frequency
least scalable topology
mesh
to detect a collision in CSMA/CD, sender must be
in transmitting state
whats true about aloha protocols
- pure aloha has half the throughput of slotted aloha
- in pure aloha, you can transmit at any time
according to whom: any composite signal is a combination of multiple sine waves w diff frequencies, amplitude and phases
Fourier
