Computer Network Mcqs

Page No. 60

Distance vector protocols use the concept of split horizon, but link-state routing protocols, such as OSPF, do not.


a True


bFalse


cA & B


d None of the above


View Answer False

Each LSA has its own age timer. By default, how long does an LSA wait before requiring an update?


a) 30 seconds


b1 minute


c 30 minutes


d 1 hour


View Answer 30 minutes

An OSPF router receives an LSA. The router checks its sequence number and finds that this number is lower than the sequence number it already has. What does the router do with the LSA?


aignores the LSA


badds it to the database


csends newer LSU update to source router


dfloods the LSA to the other routers



An OSPF router receives an LSA. The router checks its sequence number and finds that this number is higher than the sequence number it already has. Which two tasks does the router perform with the LSA?


aIgnores the LSA


bAdds it to the database


cSends newer LSU update to source router


dFloods the LSA to the other routers



An OSPF router receives an LSA, the router checks its sequence number, and this number matches the sequence number of the LSA that the receiving router already has. What does the receiving router do with the LSA?


a Ignores the LSA


bAdds it to the database


cSends newer LSU update to source router


dFloods the LSA to the other routers


View Answer Ignores the LSA

Which of the following is false with respect to the datagram networks?


aNumber of flows of packets are not limited


bPackets may not be in order at the destination


cPath is not reserved


dDelay is the same for all packets in a flow



The probability of the error in a transmitted block _________ with the length of the block


aRemains same


bDecreases


cncreases


dIs not proportional


View Answer ncreases

During datagram switching, the packets are placed in __________ to wait until the given transmission line becomes available.


aStack


bQueue


cHash


d Routing table


View Answer Queue

Which of the following is true with respect to the delay in datagram networks?


aDelay is greater than in a virtual circuit network


bEach packet may experience a wait at a switch


cDelay is not uniform for the packets of a message


dAll of the mentioned


View Answer All of the mentioned

. Which of the following remains same in the header of the packet in a datagram network during the entire journey of the packet?


a Destination address


bSource address


c Checksum


dPadding



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