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Home » Engineering » Computer Science » Aptitude Test - 39
1.The maximum throughput for pure ALOHA is ________ per cent.
A. 12.2
B. 18.4
C. 36.8
D. 12.2
2.In __________, each station is forced to send only at the beginning of the time slot.
A. pure ALOHA
B. slotted ALOHA
C. both (a) and (b)
D. pure ALOHA
3.In slotted ALOHA, the vulnerable time is ______ the frame transmission time.
A. the same as
B. two times
C. three times
D. the same as
4.In the _________ method, after the station finds the line idle, it sends its frame immediately. If the line is not idle, it continuously senses the line until it finds it idle.
A. nonpersistent
B. 1-persistent
C. p-persistent
D. nonpersistent
5.The maximum throughput for slotted ALOHA is ________ per cent.
A. 12.2
B. 18.4
C. 36.8
D. 12.2
6.The vulnerable time for CSMA is the ________propagation time.
A. the same as
B. two times
C. three times
D. the same as
7.In the ________method, a station that has a frame to send senses the line. If the line is idle, it sends immediately. If the line is not idle, it waits a random amount of time and then senses the line
A. nonpersistent
B. 1-persistent
C. p-persistent
D. nonpersistent
8. In the _______method, after the station finds the line idle it sends or refrain from sending based on the outcome of a random number generator. If the line is busy, it tries again.
A. nonpersistent
B. 1-persistent
C. p-persistent
D. nonpersistent
9. We have categorized access methods into _______ groups.
A. two
B. three
C. four
D. two
10. In ___________ methods, no station is superior to another station and none is assigned the control over another.
A. random access
B. controlled access
C. channelization
D. random access
11. The acronym OSI stands for ____ in computer networking.
A. Organization for Standards Institute
B. Open Systems Interconnection
C. Organizing Systems Interconnection
D. Organization for Standards Institute
12.Who developed standards for the OSI reference model?
A. ANSI - American National Standards Institute
B. ISO - International Standards Organization
C. IEEE - Institute of Electrical and Electronics Engineers
D. ANSI - American National Standards Institute
13.How many layers are there in the OSI reference model of networking?
A. 6
B. 7
C. 8
D. 6
14.Each layer of the OSI model receives services or data from a ___ layer.
A. below layer
B. above layer
C. Both (a) and (b)
D. below layer
15.A layer of the OSI model on one system communicates with the ___ layer of its peer system.
A. above
B. below
C. same
D. above
16.Choose the correct layer numbers and names of the OSI model below.
A. Layer 7 - Application Layer, Layer 6 - Presentation Layer
B. Layer 5 - Session Layer, Layer 4 - Transport Layer
C. Layer 3 - Network Layer, Layer 2 - Data Link Layer, Layer 1 - Physical Layer
D. Layer 7 - Application Layer, Layer 6 - Presentation Layer
17.In an OSI model, the lowest layer is the ___ layer.
A. Application Layer
B. Physical Layer
C. Presentation Layer
D. Application Layer
18.In the OSI model, which is the highest layer?
A. Application Layer
B. Physical Layer
C. Presentation Layer
D. Application Layer
19.In the OSI model, the bottom 3 layers assist in ___.
A. converting data
B. transporting data
C. Both (a) and (b)
D. converting data
20.What are the advantages of 7 layers of OSI model?
A. Troubleshooting the network is easy.
B. Developing new functions or services for a particular layer is easy.
C. Developing hardware devices targetting certain layers is easy because the services to be offered are fixed.
D. Troubleshooting the network is easy.
21.A set of standards that define how to communicate with each layer of the OSI model are ___.
A. functions
B. protocols
C. data formats
D. functions
22.The layer that transmits data in the form of bit streams using electrical and mechanical systems is ___ in the OSI model.
A. Physical layer
B. Data Link Layer
C. Network Layer
D. Physical layer
23.The physical layer involves ___
A. Optical, electrical and mechanical properties
B. Voltage levels, timing and frequency
C. Physical connections
D. Optical, electrical and mechanical properties
24.The transmission media like ___ are part of the Physical layer of OSI model.
A. Copper cables
B. OFC - Optical Fiber Cables
C. RF - Radio Frequency waves including Microwaves
D. Copper cables
25.An ethernet cable is part of __ layer in the OSI model.
A. Physical layer
B. Data Link Layer
C. Network Layer
D. Physical layer
26.The protocols working in the physical layer of the OSI Model are ___.
A. USB, Bluetooth, IEEE 802.3, IEEE 802.11, IEEE 802.15, IEEE 802.16
B. POTS, PDH, SONET, SDH, PON, OTN, DSL, ITU-T V series, ITU-T G.hn PHY
C. I.430, I.431, EIA/TIA-232, EIA/TIA-449
D. USB, Bluetooth, IEEE 802.3, IEEE 802.11, IEEE 802.15, IEEE 802.16
27.Which is the layer of the OSI reference model that employs Error Detection?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Physical Layer
28.Which is the layer that converts Packets to Frames and Frames to Packets in the OSI model?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Physical Layer
29.Which is the layer that converts Raw Bits to Frames and Frames to Raw Bits in the OSI model?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Physical Layer
30.Which topology requires a central controller or hub?
A. Mesh
B. Star
C. Bus
D. Mesh
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