WorksheetsEC8071_CR_WEEKLY_QUIZ_V_(06.10.2020)
Total questions: 30
Worksheet time: 30mins
Name
Class
Date
1.
1.An efficient ________________ must address the sensing, access and mobility of the spectrum, which are the main functions of the cognitive cycle.<br />
a)
MAC protocol
b)
Routing Protocol
c)
Link Control Protocol
d)
Traffic Control Protocol
2.
2.Channelization Schemes such as FDMA,TDMA & CDMA are widely used in Multi user Wireless Networks ,which may not serve the needs of CR networks. Validate the Statement. TRUE/FALSE?
a)
false
b)
true
3.
3.Each station is represented by a ______________________temporarily storing arriving customers, while customers arrive at each station following a random process.<br />
a)
List
b)
Tree
c)
Queue
d)
Stack
4.
4.The time between the end of a service and the beginning of the next service is the ___________________________. <br />
a)
switch over time
b)
switch off time
c)
waiting time
d)
backoff time
5.
5. The server continuously serves a station until either the station is empty or a predetermined number of customers have been served.This type of Polling Service policy is
a)
Limited Service Polling System
b)
Exhaustive Service Polling System
c)
Gated Service Polling System
d)
Limited-1 Polling System
6.
6.In _____________ type of Polling service system,where at most one customer is served whenever the server visits a station.<br />
a)
Limited Service Polling System
b)
Exhaustive Service Polling System
c)
Gated Service Polling System
d)
Limited-1 Polling System
7.
7.In ___________________Polling Service policy,the server serves all customers in a station continuously and leaves the station only when the station buffer is empty.<br />
a)
Limited Service Polling System
b)
Exhaustive Service Polling System
c)
Gated Service Polling System
d)
Limited-1 Polling System
8.
8.The server continuously serves a station until either the station is empty or all customers that arrived before the station is polled are served.This type of Service policy is applicable with_______________.<br />
a)
Limited Service Polling System
b)
Exhaustive Service Polling System
c)
Gated Service Polling System
d)
Limited-1 Polling System
9.
9.With pure ALOHA, a station transmits a packet whenever it wants to. TRUE/FALSE?<br />
a)
false
b)
true
10.
10. In pure ALOHA after the transmission, the station listens for an amount of time equal to the maximum ________________________ delay in the network plus a small fixed time increment.<br />
a)
round-trip propagation
b)
full trip propagation
c)
round trip waiting time
d)
queueing delay
11.
11.If no acknowledgment is received by the sender in an ALOHA method, it indicates a ___________________, the frame is sent again. <br />
a)
Packet Loss
b)
Collision
c)
Packet Damage
d)
Delayed packet reception
12.
12.To reduce the probability of collision when all frames involved in the previous collision are retransmitted right away simultaneously, each station retransmits after a random amount of _______________.<br />
a)
backoff time
b)
switch over time
c)
waiting time
d)
switch off time
13.
13. In ALOHA Method, the packet arrival rate at a particular station is assumed to follow ________________ distribution.
a)
erlang
b)
Gaussian
c)
Poisson
d)
Bernouli
14.
14.In slotted ALOHA, time is divided into slots, and the length of one time slot is ______________ the packet transmission time τ . <br />
a)
twice that of
b)
greater than twice that of
c)
less than
d)
equal to
15.
15.In Slotted ALOHA If a node sends a packet in time slot 't' and there is no other transmission during the same time slot (with duration τ ), then the________________________. <br />
a)
packet will be successfully received
b)
packet will not be successfully received
c)
packet will be received after several collision
d)
packet will be received only after a long delay
16.
16.One major cause of ALOHA’s low throughput problem is that users do not try to avoid collisions. Users start transmission whenever they want even when the channel is busy and collision is doomed. TRUE/FALSE ?<br />
a)
true
b)
false
17.
17.In ____________ Multiple Access method , to avoid collision, If the channel is sensed busy, the user holds its packets until the medium is free.<br />
a)
CSMA
b)
Polling
c)
Pure ALOHA
d)
Slotted ALOHA
18.
18. In CSMA-CA,The station waits for an ___________________. If the channel is still idle, the station backs off further for a random period of time. It starts transmitting only when the channel remains idle after the random backoff time. <br />
a)
Interframe Spaces (IFS)
b)
Interim time
c)
Internet waiting time
d)
Rollback time
19.
19.InCSMA-CA,During the backoff time, the backoff timer is decreased only when the channel is idle. To ensure stability, _________________ is used for handling heavy loads. <br />
a)
Binary Exponential Backoff times
b)
Linear Backoff times
c)
Uniform Backoff times
d)
Random Backoff times
20.
20.Routing information is derived from network topology information and stored in a data structure called ___________________ in hosts and routers.<br />
a)
dining tables
b)
routing tables
c)
reading tables
d)
time tables
21.
21.In _________routing rotocol, route discovery is done by broadcasting a Route Request (RREQ) message on common control channel and being identified by sender and receiver IP addresses. <br />
a)
SPEAR
b)
SAMER
c)
SORP
d)
MSCRP
22.
22.__________________ uses the available white spaces by transmitting the data over the route with higher spectrum availability. <br />
a)
SPEAR
b)
SAMER
c)
SORP
d)
MSCRP
23.
23.__________________ is an on demand routing protocol that is neither based on centralized spectrum allocation nor multi-channel. The nature of this protocol is due to lack of shared information.
a)
SPEAR
b)
SAMER
c)
SORP
d)
MSCRP
24.
24._____________________is a cross layer protocol so it identifies six system functions that implement the core functionality of spectrum aware routing.
a)
SPEAR
b)
SAMER
c)
SORP
d)
MSCRP
25.
25.___________________________uses dynamic source routing (DSR) mechanism for route discovery in which source node broadcasts an RREQ message with new RREQ_ID and attaches its band radio usage table (BRT). <br />
a)
MRSA PROTOCOL
b)
LOCAL COORDINATION BASED MULTIPATH ROUTING PROTOCOL
c)
REACTIVE SOURCE BASED MULTIPATH ROUTING PROTOCOL
d)
TREE BASED ROUTING PROTOCOL
26.
26.In _____________________routing technique source specifies how the data travels across the network. Path to destination node is computed by the source node.<br />
a)
MRSA PROTOCOL
b)
LOCAL COORDINATION BASED MULTIPATH ROUTING PROTOCOL
c)
REACTIVE SOURCE BASED MULTIPATH ROUTING PROTOCOL
d)
TREE BASED ROUTING PROTOCOL
27.
27.______________is centralized routing scheme which is controlled by a single network entity called base station. Thus network topology can be quickly constructed among CR station by configuring cognitive base station as root.<br />
a)
MRSA PROTOCOL
b)
LOCAL COORDINATION BASED MULTIPATH ROUTING PROTOCOL
c)
REACTIVE SOURCE BASED MULTIPATH ROUTING PROTOCOL
d)
TREE BASED ROUTING PROTOCOL
28.
28.The ________________________________ is started when nodes evaluate the workload of both accommodating the flow and redirecting it. Nodes choose the flow accommodation or flow redirection based on the evaluation results and neighborhood interaction.<br />
a)
MRSA PROTOCOL
b)
LOCAL COORDINATION BASED MULTIPATH ROUTING PROTOCOL
c)
REACTIVE SOURCE BASED MULTIPATH ROUTING PROTOCOL
d)
TREE BASED ROUTING PROTOCOL
29.
29.If the packet arriving rate is higher than the rate at which the packets are _______________, the receiving buffer will be fully occupied by packets waiting to be processed.<br />
a)
removed from the buffer
b)
keep on storing in the buffer
c)
buffer is closed
d)
transmission is stopped
30.
30. To detect errors throughout a frame _________________error control mechanism is preferred.
a)
CHECKSUM
b)
CYCLIC REDUNDANCY CHECK
c)
VERTICAL REDUNDANCY CHECK
d)
FEC & RETRANSMISSION
100 %
