1) The acronym OSI stands for ____ in computer networking.
A) Organization for Standards Institute
B) Open Systems Interconnection
C) Organizing Systems Interconnection
D) Open Systems Interworking
Explanation:
OSI refers to Open Systems for Interconnection.
2) 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) ACM - Association for Computing Machinery
Explanation:
Yes. It is ISO (International Standards Organization) that developed standards for operating OSI model layers in the year 1984.
3) How many layers are there in the OSI reference model of networking?
A) 5
Explanation:
7 Layers in total.
4) Each layer of the OSI model receives services or data from a ___ layer.
A) below layer
Explanation:
Layers receive data or services from the below layers.
5) In the OSI model, each layer gives services or data to the __ layer.
A) below
Explanation:
In other words, the upper layers always receive services or data from the below layers.
6) A layer of the OSI model on one system communicates with the ___ layer of its peer system.
A) above
Explanation:
So, any given OSI layer can communicate with the same layer of its peer node.
7) 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
Explanation:
The matching order is as follows. Layer 7 = Application Layer, Layer 6 = Presentation Layer, Layer 5 = Session Layer, Layer 4 = Transport Layer, Layer 3 = Network Layer, Layer 2 = Data Link Layer, Layer 1 = Physical Layer.
8) In an OSI model, the lowest layer is the ___ layer.
A) Application Layer
Explanation:
Yes, the Physical layer is the lowest.
9) In the OSI model, which is the highest layer?
A) Application Layer
Explanation:
Yes, the Application Layer or Layer-7 is the highest layer.
10) In the OSI model, the bottom 3 layers assist in ___.
A) converting data
Explanation:
It is because of the bottom 3 layers of OSI, the data gets transferred from one node to another through the network.
11) 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.
12) A set of standards that define how to communicate with each layer of the OSI model are ___.
A) functions
13) The layer that transmits data in the form of bit streams using electrical and mechanical systems is ___ in the OSI model.
A) Physical layer
Explanation:
Physical Layer
14) The physical layer involves ___
A) Optical, electrical and mechanical properties
B) Voltage levels, timing and frequency
15) 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
16) An ethernet cable is part of __ layer in the OSI model.
A) Physical layer
17) 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
Explanation:
All the above protocols are worth remembering for competitive exams.
18) Which is the layer of the OSI reference model that employs Error Detection?
A) Physical Layer
Explanation:
Data Link Layer
19) Which is the layer that converts Packets to Frames and Frames to Packets in the OSI model?
A) Physical Layer
Explanation:
Network Layer
20) Which is the layer that converts Raw Bits to Frames and Frames to Raw Bits in the OSI model?
A) Physical Layer
Explanation:
Data Link Layer
