NEXT GENERATION OPTICAL TRANSPORT NETWORK (NG OTN)

E4-E5 E and W S
NEXT GENERATION OPTICAL TRANSPORT NETWORK (NG OTN)
Q. 1 , What is the main reason behind the emergence of flexible technologies like OTN?

A) To increase voice traffic on optical networks

B) To reduce the demand for services and bandwidth

C) To supplement the mature, voice optimized, SONET/SDH transport infrastructure

D) To eliminate additional Capital Expenditures (CAPEX) on multiple parallel networks

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Q. 2 , What is the aim of the optical transport network (OTN)?

A) To provide a common and Ethernet-like operational model for network operations

B) To provide a vehicle to enable convergence, and for providing a common and SONET/SDH-like operational model

C) To provide protection and performance monitoring

D) To eliminate the need for fiber optic cables

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Q. 3 , What is the ITU-T specification that acts as the core technology definition of OTN?

A) G.709

B) G.7041

C) G.8032

D) G.8262

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Q. 4 , Which of the following is a distinguishing characteristic of OTN?

A) It is client-dependent

B) It provides transport for analog payloads

C) It provides transport for any digital signal independent of client-specific aspects

D) It does not provide transport for Ethernet services

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Q. 5 , What does the ITU Standard G.709 define?

A) The encapsulation format, multiplexing, switching, management, supervision, and survivability of optical channels carrying client payloads

B) The encapsulation format, multiplexing, and switching of optical channels carrying client payloads

C) The management, supervision, and survivability of optical channels carrying client payloads

D) The encapsulation format and switching of optical channels carrying client payloads

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Q. 6 , What types of services can OTN support?

A) Only narrowband services

B) Only broadband services

C) Both narrowband and broadband services

D) Neither narrowband nor broadband services

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Q. 7 , What is the primary advantage of OTN in terms of reduction in transport costs?

A) It allows multiple clients to be transported on a single wavelength

B) It ensures fill rates are maintained across a network using OTN switches at fiber junctions

C) It dedicates specific and configurable bandwidth to each service

D) It virtualizes network operations

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Q. 8 , How does OTN facilitate efficient use of DWDM capacity?

A) By ensuring fill rates are maintained across a network using OTN switches at fiber junctions

B) By dedicating specific and configurable bandwidth to each service

C) By virtualizing network operations

D) By reducing the demand for services and bandwidth

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Q. 9 , What does OTN guarantee in terms of network capacity and managed performance?

A) Throughput only

B) Latency only

C) Jitter only

D) Throughput, latency, jitter, and availability

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Q. 10 , What is the main advantage of OTN over legacy transport networks?

a) Reduction in transport costs

b) Efficient use of optical spectrum

c) Determinism

d) All of the above

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Q. 11 , How does OTN facilitate efficient use of DWDM capacity?

a) By using SONET/SDH protocols for all clients

b) By ensuring fill rates are maintained across a network using OTN switches at fiber junctions

c) By using fixed frame rates for all clients

d) By dedicating specific bandwidth to each service

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Q. 12 , What does 'determinism' mean in the context of OTN?

a) It guarantees that network capacity and managed performance are guaranteed for each client

b) It refers to the ability to partition an OTN-switched network into private network partitions

c) It allows operators to employ the technologies needed now to support transport demands

d) It refers to the ability of OTN to support multiple protocols

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Q. 13 , What is the purpose of Optical Virtual Private Networks (OVPNs)?

a) To reduce transport costs

b) To virtualize network operations

c) To ensure a high level of privacy and security

d) To facilitate the introduction of transparent optical network elements

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Q. 14 , What is the advantage of OTN networks in terms of flexibility?

a) They allow for the efficient use of optical spectrum

b) They ensure a high level of privacy and security

c) They give operators the ability to adopt new technologies as business requirements dictate

d) They provide a dedicated set of network resources to a client

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Q. 15 , What makes OTN networks secure by design?

a) The ability to partition an OTN-switched network into private network partitions

b) The ability to employ the technologies needed to support transport demands

c) The hard partitioning of traffic onto dedicated circuits

d) The use of fixed frame rates for all clients

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Q. 16 , What is the advantage of carrying OTN network management data on a separate channel?

a) OTN network settings are more easily accessible and modifiable

b) OTN network management data is less secure

c) OTN network management data is completely isolated from user application data

d) OTN network management data is carried on the same channel as user application data

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Q. 17 , How does OTN improve Forward Error Correction (FEC)?

a) By increasing the number of bytes reserved for FEC, allowing a theoretical improvement of the Signal-to-Noise Ratio (SNR) by 6.2 dB

b) By reducing the number of bytes reserved for FEC, allowing a theoretical improvement of the Signal-to-Noise Ratio (SNR) by 6.2 dB

c) By using fixed frame rates for all clients

d) By dedicating specific bandwidth to each service

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Q. 18 , What is one of the primary advantages of OTN over legacy transport networks?

a) Reduced transport costs

b) Faster network speeds

c) Better network security

d) None of the above

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Q. 19 , What is OTN designed to be an efficient transport layer for?

a) Packet services such as Ethernet

b) Video protocols only

c) Fiber Channel protocols only

d) None of the above

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Q. 20 , What is OTN's approach to network partitioning?

a) Optical Virtual Private Networks (OVPNs)

b) Virtual Local Area Networks (VLANs)

c) Both a) and b)

d) None of the above

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Q. 21 , What is the benefit of OTN's approach to network partitioning?

a) Improved network security

b) Better network management

c) More efficient use of resources

d) All of the above

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Q. 22 , What is the advantage of OTN's approach to network evolution?

a) Network upgrades can be tested or introduced in a protected network partition

b) Upgrades can be made without any impact on production partitions

c) OTN networks can employ the technologies needed now while enabling the adoption of new technologies as needed

d) All of the above

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Q. 23 , What is the benefit of OTN's Tandem Connection Monitoring (TCM)?

a) It enables the user and its signal carriers to monitor the quality of the traffic that is transported between segments or connections in the network

b) It provides better network security

c) It enables more efficient use of resources

d) None of the above

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Q. 24 , What is the difference between OTN and SONET/SDH?

a) OTN was defined with fixed frame sizes, while SONET/SDH was defined with fixed frame rates

b) OTN requires tight timing distribution across networks, while SONET/SDH does not

c) OTN scales to 100 Gb/s and beyond, while SONET/SDH scales to a maximum of 40 Gb/s

d) All of the above

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Q. 25 , What is one advantage of SONET/SDH over OTN?

a) SONET/SDH uses a fixed frame rate for a given line rate and increases frame size (or uses concatenation of multiple frames) as client size increases

b) SONET/SDH performs multi-stage multiplexing

c) SONET/SDH FEC is not applicable (no standardized FEC)

d) None of the above

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Q. 26 , What functions are defined by the G.709 standard for OTN?

a) Client payload encapsulation, OAM overhead, FEC, and a multiplexing hierarchy

b) Only client payload encapsulation and OAM overhead

c) Only FEC and a multiplexing hierarchy

d) None of the above

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Q. 27 , What does OTN stand for?

A) Optical Transport Network

B) Optical Transmission Network

C) Optical Termination Network

D) Optical Multiplexing Network

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Q. 28 , What is the purpose of the OTN inter-domain interface (IrDI)?

A) To connect networks within one operator and vendor domain

B) To connect the networks of two operators or the subnetworks of one or multiple vendors in the same operator domain

C) To manage the optical supervisory channel (OSC)

D) To limit the number of required regenerators used in the network

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Q. 29 , What is the purpose of the OTN intra-domain interface (IaDI)?

A) To connect networks within one operator and vendor domain

B) To connect the networks of two operators or the subnetworks of one or multiple vendors in the same operator domain

C) To manage the optical supervisory channel (OSC)

D) To limit the number of required regenerators used in the network

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Q. 30 , What is the purpose of the optical channel payload unit (OPU) layer in the OTN?

A) To adapt the client signal rate to the OPU rate

B) To provide framing and section monitoring

C) To transport the optical channel (OCh)

D) To manage the OTN’s digital functions

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Q. 31 , What is the purpose of the optical channel data unit (ODU) in the OTN?

A) To provide framing and section monitoring

B) To transport the optical channel (OCh)

C) To adapt the client signal rate to the OPU rate

D) To manage the OTN’s digital functions

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Q. 32 , What is the purpose of the optical transport unit (OTU) in the OTN?

A) To provide framing and section monitoring

B) To transport the optical channel (OCh)

C) To adapt the client signal rate to the OPU rate

D) To add forward error correction (FEC) to the network elements

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Q. 33 , What is the purpose of the optical multiplex section (OMS) in the OTN?

A) To provide framing and section monitoring

B) To transport the optical channel (OCh)

C) To connect networks within one operator and vendor domain

D) To refer to sections between optical multiplexers and demultiplexers

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Q. 34 , What is the purpose of the optical transmission section (OTS) in the OTN?

A) To provide framing and section monitoring

B) To transport the optical channel (OCh)

C) To connect networks within one operator and vendor domain

D) To refer to sections between any network elements in the OTN, including amplifiers

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Q. 35 , What is the highest multiplexing level in the OTN?

A) Optical channel payload unit (OPU)

B) Optical channel data unit (ODU)

C) Optical transport unit (OTU)

D) Optical supervisory channel (OSC)

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Q. 36 , What does G.709 define?

a) Optical transport network equipment

b) Standard interfaces and rates

c) Fixed frame rates

d) SONET/SDH frame structure

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Q. 37 , What is the OTUk line rate for STS-48/STM-16 client signal?

a) 10,709,225 kbit/s

b) 11,095,727 kbit/s

c) 2,666,057 kbit/s

d) 43,018,413 kbit/s

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Q. 38 , What is the OTUk frame period for STS-768/STM-256/Transcoded 40GBASE-R client signal?

a) 1.167 µs

b) 2.928 µs

c) 3.034 µs

d) 11.766 µs

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Q. 39 , What is the OTUk line rate for 100GBASE-R client signal?

a) 44,583,355 kbit/s

b) 111,809,973 kbit/s

c) 40,150,519 kbit/s

d) 10,356,012 kbit/s

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Q. 40 , What are the three overhead areas in an OTN frame?

a) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Terminal Unit (OTU) overhead

b) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Transmission Unit (OTU) overhead

c) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Transport Unit (OTU) overhead

d) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Connection Unit (OCU) overhead

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Q. 41 , What is the function of the FEC in an OTN frame?

a) Improves the Optical Signal-to-Noise Ratio (OSNR) by 4 to 6 dB

b) Provides path and section performance monitoring

c) Enables transport to become as important as computing and storage in intelligent data center networking

d) Maps the client signals into OPUs

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Q. 42 , What are the most common types of optical transport network equipment?

a) Regenerators, optical terminal equipment, and optical switch

b) Optical terminal equipment, optical cross connect, and optical add/drop multiplexer (OADMs)

c) Optical switch, optical add/drop multiplexer (OADMs), and regenerators

d) Optical terminal equipment, optical add/drop multiplexer (OADMs), and regenerators

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Q. 43 , What is the main advantage of OTN-based backbones and metro cores over traditional WDM transponder-based networks?

a) Increased efficiency

b) Fixed frame sizes

c) Reduced hops

d) Better management and monitoring

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Q. 44 , What is the purpose of the Forward Error Correction (FEC) function in an OTN frame?

a) To increase the Optical Signal-to-Noise Ratio (OSNR)

b) To decrease the Optical Signal-to-Noise Ratio (OSNR)

c) To provide alarm indication and communication capabilities

d) To increase the OTN line rate

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Q. 45 , What are the three overhead areas in an OTN frame?

a) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Transmission Unit (OTU) overhead

b) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Transport Unit (OTU) overhead

c) Optical Payload Unit (OPU) overhead, Optical Performance Unit (OPU) overhead, and Optical Transmission Unit (OTU) overhead

d) Optical Payload Unit (OPU) overhead, Optical Data Unit (ODU) overhead, and Optical Performance Unit (OPU) overhead

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Q. 46 , What is the purpose of an Optical Add/Drop Multiplexer (OADMs) in an OTN network?

a) To process OTN signals in the optical domain

b) To provide path and section performance monitoring

c) To map client signals into OPUs

d) To add or remove specific wavelengths from an optical network

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Q. 47 , What is the main advantage of an OTN-based network compared to a traditional WDM transponder-based network?

a) Reduced equipment acquisition costs

b) Increased efficiency and reliability

c) Better management and monitoring capabilities

d) Increased protection of services

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Q. 48 , What is the maximum line rate for an OTU4 signal?

a) 10,709,225 kbit/s

b) 43,018,413 kbit/s

c) 44,583,355 kbit/s

d) 111,809,973 kbit/s

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Q. 49 , What is the frame period for an OTU3 signal?

a) 2.928 µs

b) 3.034 µs

c) 11.766 µs

d) 48.971 µs

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Q. 50 , What type of signals can be transported over ODU2e?

a) ODU0 signals

b) ODUflex signals

c) Ethernet signals up to 4 10GBASE-R

d) SONET/SDH STM-256

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Q. 51 , What is the purpose of OTN terminal equipment in an OTN network?

a) To process OTN signals in the optical domain

b) To provide path and section performance monitoring

c) To map client signals into OPUs

d) To enable point-to-point connections through WDM networks

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Q. 52 , What is the highest OTN line rate for SONET/SDH signals?

a) OTU1

b) OTU2

c) OTU2e

d) OTU3

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