Optical Network Transmission Modes, Layers and Protocols

Optical Communications

This set of Optical Communications Questions and Answers for Aptitude test focuses on “Optical Network Transmission Modes, Layers and Protocols”.

1. Electrical devices in optical network are basically used for _____________
a) Signal degradation
b) Node transfer
c) Signal control
d) Amplification

2. Signals are defined as ________________ if their significant instants occur at nominally the same rate, any variation being constrained within specific limits.
a) Plesiochronous
b) Opt-electric
c) Physiometric
d) Opt-immune

3. The bit stuffing in the plesiochronous digital hierarchy is complex and uneconomic.
a) False
b) True

4. A ____________ digital hierarchy was required to enable the international communications network to evolve in the optical fiber era.
a) Asynchronous
b) Dedicated
c) Seismic
d) Synchronous

5. The standardization towards a synchronous optical network termed SONET commenced in US in _______
a) 1985
b) 1887
c) 2001
d) 1986

6. ______________ is a packetized multiplexing and switching technique which combines the benefits of circuit and packet switching.
a) Synchronous mode
b) Asynchronous transfer mode
c) Circuit packet
d) Homogeneous mode

7. The ___________ sits at the top of hierarchy of the OSI layer model.
a) Session layer
b) Transport layer
c) Application layer
d) Data link layer

8. The ____________ controls the dialogs between intelligent devices.
a) Physical layer
b) Transport layer
c) Application layer
d) Session layer

9. The network layer looks after the flow and error control mechanism.
a) True
b) False

10. The physical layer is located at the bottom of the OSI model.
a) True
b) False

11. In order to access for end-to-end networking of optical channels to transparently convey information, the _____________ is employed in the OTN structure.
a) Presentation layer
b) Session layer
c) OPU
d) OCh layer

12. An advanced type of reconfigurable OTN is referred to as an _______________
a) Automatic OTN
b) Auto-generated photon
c) Automatically switched optical network
d) Optical reimbursement

13. The __________ is a network layer that contains both addressing and control information to enable packets to be routed within a network.
a) TCP
b) Internet protocol (IP)
c) UDP
d) SONET/SDH protocol

14. The mapping of IP frames in SDH/SONET is accomplished in ___________ stages.
a) Four
b) Two
c) Three
d) One

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