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| Section | Objectives |
|---|---|
| Fundamentals of Optical Networking | - Optical networking components
|
| Optical Network Architectures and Systems | - Metro and long-haul optical networks
|
| WDM and Optical Transport Technologies | - Wavelength Division Multiplexing (WDM)
|
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NEW QUESTION # 28
Which use case is most suitable for the deployment of a star topology?
Answer: B
Explanation:
A star topology is a network design where all devices are connected to a central hub, which acts as a central point of control and management for the network. This type of topology is commonly used in access networks, where a central node is used to aggregate traffic from multiple users or devices, and then forward it to the core network. This design allows for efficient use of resources and easy management of the network.
Reference:
"Computer Networking: A Top-Down Approach" by James Kurose and Keith Ross (Chapter 3)
"Data Communications and Networking" by Behrouz A. Forouzan (Chapter 2)
NEW QUESTION # 29
How can a mesh network be upgraded so that more services can be transported?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
While technologies like WSS (Wavelength Selective Switches) and coherent transmission (100G/200G/400G+) significantly improve the efficiency and reach of a network, the most direct way to increase the total transportable volume of services in a mesh topology is to upgrade link capacity or install new physical links. In Nokia optical planning, upgrading link capacity typically involves moving from a lower-rate system (like 10G) to a higher-rate system (like 100G or 400G) or increasing the number of available wavelengths by expanding from a 40-channel to an 80-channel or 96-channel C-band system.
Adding new links (new fiber spans) creates more degrees in the mesh, providing more paths for traffic and increasing the overall aggregate bandwidth of the network. Option A refers to flexibility (ROADM functionality) rather than raw capacity. Option B (PRC) relates to survivability and availability, not capacity expansion. While Option C (coherent transmission) is a powerful method for increasing capacity per wavelength, it is not the "only" way, as adding more fiber (spatial multiplexing) or more channels (spectral density) are also primary methods for scaling a mesh network to handle more services.
NEW QUESTION # 30
What is a Shared Risk Group (SRG)?
Answer: B
Explanation:
According to the Nokia Optical Networking documentation, a Shared Risk Group (SRG) is defined as "a set of network resources that share a common failure risk. When a resource in an SRG fails, the other resources in the group are also affected." This can include fibers, boards, nodes, and other network resources. The SRG concept is used in network design and protection mechanisms to ensure survivability and minimal impact on service in case of a failure.
NEW QUESTION # 31
What is the metro area network?
Answer: D
Explanation:
The Metro Area Network (MAN) is a telecommunications network that spans a metropolitan area and connects multiple local area networks (LANs) or business networks together. It typically covers an area that is larger than a LAN but smaller than a wide area network (WAN). The purpose of a MAN is to provide a high-bandwidth, low-latency communication infrastructure for businesses and other organizations in a metropolitan area.
Reference:
Cisco, "Metro Ethernet Services," https://www.cisco.com/c/en/us/solutions/service-provider/metro-ethernet-services/index.html Techopedia, "Metro Area Network (MAN)," https://www.techopedia.com/definition/26896/metro-area-network-man
NEW QUESTION # 32
What is the meaning of first, second, and third window in the optical fiber propagation context?
Answer: D
Explanation:
In optical fiber propagation context, the first, second, and third window refer to different wavelength intervals where the WDM (Wavelength Division Multiplexing) optical transmission occurs.
The first window is the lowest loss window and is typically in the range of 1300-1324nm. This is the most commonly used window for long-haul communications.
The second window is the 1550 nm window and is the most widely used window for long-haul and ultra-long-haul communications. This window has a lower attenuation than the first window, but it also has more dispersion, which can limit the maximum transmission distance.
The third window is the range of 1625-1675 nm, it is also called the L-band window. This window has lower attenuation than the first and second window but its usage is limited due to the high cost of equipment and lack of commercial devices.
These windows are used in WDM systems to increase the capacity of the fiber by transmitting multiple channels of data at different wavelengths on the same fiber.
A,C,D are not correct as they are not related to the meaning of first, second, and third window in the optical fiber propagation context.
Reference:
Nokia Optical Networking Fundamentals, Nokia Press (ISBN:978-1-4822-8109-4)
https://www.nokia.com/networks/solutions/optical-networking/
https://en.wikipedia.org/wiki/Wavelength-division_multiplexing
NEW QUESTION # 33
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