Solved Past Papers MCQs of Lecturer Computer Science for the preparation of NTS, PPSC, SPSC, BPSC, KPSC, FPSC, OTS, and other academic entry tests and jobs tests.
26. LRU page – replacement algorithm associates with each page the …….
A) Time it was brought into memory
B) The time of that pages last use
C) Page after and before it
D) All of these
27. For 3 page frames, the following is the reference string: 7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1; How many page faults does the LRU page replacement algorithm produce
A) 10
B) 15
C) 11
D) 12
28. CPU fetches the instruction from memory according to the value of
A) Program counter
B) Status register
C) Instruction register
D) Program status word
29. A memory buffer used to accommodate a spood differential is called
A) Slack pointer
B) Cache
C) Accumulator
D) Disk buffer
30. A process refers to 5 pages A, B, C, D, E in the order A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with Internal store of 3 frames is
A) 8
B) 10
C) 9
D) 7
31. In computer network nodes are
A) The computer that originates the data
B) The computer that routes the data
C) The computer that terminates the data
C) All of the these
32. Communication channel is shared by all the machines on the network in
A) Broadcast network
B) Uni-cast network
C) Multicast network
D) Anycast network
33. Bluetooth is an example of …….
A) Personal area network
B) Local area network
C) Virtual private network
D) Wide area network
34. In virtual circuit, network each packet contains
44. A ……. is a device that forwards packets between networks by processing the routing information included in the packet
A) Bridge
B) Firewall
C) Router
D) All of these
45. A list of protocols used by a system, one protocol per layer, is called
A) Protocol architecture
B) Protocol stack
C) Protocol suite
D) Protocol system
46. Network congestion occurs
A) In case of traffic overloading
B) When a system terminates
C) When connection between two nodes terminates
D) In case of transfer failure
47. Which of the following networks extends a private network across public networks
A) Local area network
B) Virtual private network
C) Enterprise private network
D) Storage area network
48. The network layer concerns with ……
A) Bits
B) Frames
C) Packets
D) None of these
49. Which one of the following is not a function of network layer
A) Routing
B) Inter-networking
C) Congestion control
D) None of these
50. A 4 byte IP address consists of ……
A) Only network address
B) Only host address
C) Network address & host address
D) Network address & MAC address