[Feb-2024] Nokia 4A0-220 Exam: Basic Questions With Answers
New 2024 Realistic Free Nokia 4A0-220 Exam Dump Questions and Answer
Nokia 4A0-220 exam is a certification exam that focuses on the Nokia GMPLS-Controlled Optical Networks. Nokia is a global leader in telecommunications and information technology, and 4A0-220 exam is aimed at professionals who are looking to enhance their knowledge and skills in this specific field. 4A0-220 exam is designed to test the candidates' understanding of the GMPLS-controlled optical networks and their ability to configure and manage these networks.
NEW QUESTION # 20
A network with ROADM GMPLS nodes and optical transponder connections could have:
- A. No restoration capabilities
- B. L0 restoration capabilities
- C. L0 and LI restoration capabilities
- D. L1 restoration capabilities
Answer: C
Explanation:
Explanation
A network with ROADM GMPLS nodes and optical transponder connections could have both L0 and L1 restoration capabilities. L0 restoration refers to the ability of the network to recover from failures at the optical layer, such as fiber cuts or node failures, by rerouting the affected LSPs to alternative paths at the same layer.
L0 restoration can be achieved by using GMPLS signaling protocols, such as RSVP-TE or CR-LDP, to establish backup LSPs in advance or on demand. L0 restoration can provide fast recovery times and high availability for optical services34. L1 restoration refers to the ability of the network to recover from failures at the sub-wavelength layer, such as transponder failures or wavelength unavailability, by rerouting the affected LSPs to alternative paths at a higher layer. L1 restoration can be achieved by using GMPLS routing protocols, such as OSPF-TE or ISIS-TE, to advertise the sub-wavelength information and availability to other nodes in the network. L1 restoration can provide more flexibility and efficiency for sub-wavelength services56.
References:
* 3: GMPLS - Nokia
* 4: Generalized Multi-Protocol Label Switching - Wikipedia
* 5: Sub-Wavelength Switching - Nokia
* 6: Sub-Wavelength Switching in Optical Networks - IEEE Xplore
NEW QUESTION # 21
What is the purpose of the RSVP-TE Notify message?
- A. It is the node's alarm control channel
- B. It is a mechanism to inform non-adjacent nodes of LSP events
- C. It is a mechanism to inform the NM5 of L5P events
- D. It is confirmation of a node's resource reservation
Answer: B
Explanation:
Explanation
RSVP-TE Notify message is a message type defined in the RSVP-TE protocol, which is an extension of the RSVP protocol for MPLS traffic engineering. RSVP-TE Notify message is used to inform non-adjacent nodes of LSP events, such as setup, modification, or teardown. This allows the nodes to update their local state information and perform actions based on the notification. For example, a Notify message can be used to trigger a fast reroute mechanism in case of a link or node failure12. References:
* 1: RFC 3473 - Generalized Multi-Protocol Label Switching (GMPLS) Signaling Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Extensions
* 2: RFC 3471 - Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description
NEW QUESTION # 22
What is the function of the OSPF-TE protocol?
- A. To create an MPLS tunnel between two or more end points
- B. To exchange with other nodes data about the state of links
- C. To monitor the availability of the links interconnecting adjacent nodes
- D. To assign different priority to various types of transported signals
Answer: B
Explanation:
Explanation
The OSPF-TE protocol is an extension of the Open Shortest Path First (OSPF) protocol that is used to exchange information about the state of links in a GMPLS network. OSPF-TE advertises link attributes such as bandwidth, latency, priority, protection, or switching capabilities to other nodes in the same area. OSPF-TE enables nodes to build a Traffic Engineering Database (TED) that contains the topology and resource information of the network. OSPF-TE helps nodes to perform CSPF calculations and establish LSPs using RSVP-TE signaling. References : Open Shortest Path First - Wikipedia, Understand Open Shortest Path First (OSPF) - Design Guide, RSVP-TE and OSPF-TE extensions for GMPLS
NEW QUESTION # 23
Which of the following is not a key feature of GMPLS?
- A. Restoration
- B. Resource optimization
- C. Self-discovery
- D. Fast protection
Answer: B
Explanation:
Explanation
GMPLS is a protocol suite that extends the MPLS signaling and routing capabilities to control different types of switching technologies, such as optical, TDM, and packet switching1. GMPLS has several key features, such as self-discovery, fast protection, and restoration. Self-discovery allows GMPLS nodes to automatically discover their neighbors and exchange information about their capabilities and resources2. Fast protection enables GMPLS nodes to quickly switch to backup paths in case of a failure, without relying on the control plane3. Restoration allows GMPLS nodes to dynamically establish new paths in the network after a failure, using the control plane3. Resource optimization is not a key feature of GMPLS, but rather a potential benefit of using GMPLS to efficiently utilize the network resources and avoid over-provisioning. References:
* 1: Nokia GMPLS-controlled Optical Networks Course | Nokia
* 2: GMPLS - Nokia
* 3: Traffic survivability through Protection and Restoration Combined (PRC) - YouTube
* [4]: GMPLS: Architecture and Applications - Google Books
NEW QUESTION # 24
Which of the following statements best describes a distributed control plane for GMPLS?
- A. Each router has software to run the GMPLS protocols and can modify the node's switching fabric.
- B. The control plane is active in some network nodes and not in others.
- C. The network manager controls all the routing for the network.
- D. The network is managed by more than one network management system.
Answer: A
Explanation:
Explanation
A distributed control plane for GMPLS means that each router has software to run the GMPLS protocols and can modify the node's switching fabric. This allows the routers to communicate with each other and establish Label Switched Paths (LSPs) across the network without relying on a centralized controller or network manager. A distributed control plane can improve the scalability, reliability, and efficiency of the network. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, GMPLS - Nokia
NEW QUESTION # 25
Which provisioning steps arecommon in both CP to plain MP networks?
- A. Node creation
CPB provisioning process Node synchronization NPA implementation - B. Node creation
CPB provisioning process Link association CPB power balance - C. Node creation SRG creation Node synchronization CPB power balance
- D. Node creation
CPB provisioning process Node synchronization CPB power balance
Answer: D
Explanation:
Explanation
The provisioning steps that are common in both CP to plain MP networks are node creation, CPB provisioning process, node synchronization, and CPB power balance. These steps are required to create and commission the nodes, provision the cross-connect boards (CPBs), associate the links between the nodes, synchronize the network elements (NEs) with the NFM-T, and balance the power levels of the CPBs. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, Nokia Advanced Optical Network Management with NFM-T Course | Nokia
NEW QUESTION # 26
What is a Label Switched Path (LSP)?
- A. A protocol used by nodes to exchange information about the state of labels
- B. The path created by MPLS nodes
- C. A High Order Container for client signal
- D. A switched protection path
Answer: B
Explanation:
Explanation
A Label Switched Path (LSP) is the path created by MPLS nodes that use labels to forward packets across the network. A label is a short identifier that is attached to each packet and indicates the next hop or destination of the packet. The nodes use a label forwarding table to switch packets based on their labels, without inspecting the packet headers. This can improve the performance, security, and quality of service of the network. An LSP can be established by using GMPLS protocols such as OSPF-TE and RSVP-TE, which exchange information about the network topology, resources, and constraints. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, GMPLS - Nokia
NEW QUESTION # 27
In a 1830PSS MRN network, when can groups of links be combined (bundled) together in a single TE-Link?
- A. Only within layer 0 networks
- B. Never
- C. Both within layer 0 and 1 networks
- D. Only within layer 1 networks
Answer: C
Explanation:
Explanation
In a 1830PSS MRN network, groups of links can be combined (bundled) together in a single TE-Link both within layer 0 and 1 networks. A TE-Link is a logical representation of one or more physical links that share the same attributes and can be used to establish Label Switched Paths (LSPs). A TE-Link can be either single-layer or multi-layer, depending on the switching capabilities of the links. In a single-layer TE-Link, all the links belong to the same layer, either layer 0 (optical) or layer 1 (OTN). In a multi-layer TE-Link, the links belong to different layers, such as layer 0 and layer 1. A TE-Link can be either bundled or unbundled, depending on the number of links it contains. A bundled TE-Link contains more than one link, while an unbundled TE-Link contains only one link. A bundled TE-Link can provide more bandwidth and flexibility than an unbundled TE-Link. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, 3.
GMPLS - Nokia
NEW QUESTION # 28
How is the GMRE functionality guaranteed in Nokia equipment?
- A. The specific software configuration guarantees GMRE functionality
- B. Redundant LAN cables guarantee GMRE functionality
- C. Rack redundancy guarantees GMRE functionality in case of a power outage
- D. Controller redundancy guarantees GMRE functionality
Answer: D
Explanation:
Explanation
The GMRE functionality is guaranteed in Nokia equipment by controller redundancy. The controller is the hardware component that runs the GMPLS software and controls the switching fabric of the node. Each node has two controllers, one active and one standby, that synchronize their states and databases. If the active controller fails, the standby controller takes over and ensures the continuity of the GMRE functionality. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, 1830 Photonic Service Switch (PSS) | Nokia
NEW QUESTION # 29
How are L0 and L1 resources coordinated in case of a failure in an MRN?
- A. Coordination is achieved by setting the color constraints
- B. Coordination is achieved by comparing the Setup Priorities
- C. Coordination is achieved by segregation of color and colorless LSPs
- D. Coordination is achieved by setting the WSR parameter
Answer: A
Explanation:
Explanation
Coordination of L0 and L1 resources in case of a failure in an MRN is achieved by setting the color constraints. Color constraints are used to specify which wavelengths or timeslots can be used by a given LSP request. By setting the color constraints, the NFM-T can ensure that the L0 and L1 resources are compatible and consistent across the network. For example, if an L0 LSP request requires a specific wavelength, the NFM-T can set the color constraint to match that wavelength and assign it to the L0 LSP. Similarly, if an L1 LSP request requires a specific timeslot, the NFM-T can set the color constraint to match that timeslot and assign it to the L1 LSP. This way, the coordination of L0 and L1 resources is achieved by ensuring that the same color is used by both layers. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, 3.
GMPLS - Nokia
NEW QUESTION # 30
What is the definition of Constrained Shortest Path First (CSPF)?
- A. It is the SPF algorithm applied to low bandwidth LSPs.
- B. It is a combination between OSPF-TE and RSVP-TE.
- C. It is the SPF algorithm applied for low latency LSPs.
- D. It is the 5FP algorithm applied after pruning links that do not meet the specified constraints.
Answer: D
Explanation:
Explanation
Constrained Shortest Path First (CSPF) is an extension of the shortest path first (SPF) algorithm that is used to find the best path for a Label Switched Path (LSP) in a GMPLS network. CSPF takes into account additional constraints such as bandwidth, latency, priority, or node or link inclusion or exclusion. CSPF works by pruning those links that do not meet the specified constraints and then applying the SPF algorithm to the remaining links. This way, CSPF can find a path that satisfies both the shortest distance and the constraints. References : Constrained Shortest Path First - Wikipedia, Constrained Shortest Path First (CSPF) - Metaswitch
NEW QUESTION # 31
What is the Commissioning File in GMRE nodes?
- A. A control checklist for the operator
- B. A file with commissioned GMRE nodes for NPA implementation
- C. A file with target values that determine whether a given LSP is possible
- D. A file of optical impairment parameters for power balance
Answer: C
Explanation:
Explanation
The Commissioning File in GMRE nodes is a file with target values that determine whether a given LSP is possible. The Commissioning File contains parameters such as power, OSNR, Q-factor, and dispersion that are used to evaluate the feasibility of an LSP request. The Commissioning File is generated by the Network Planning Application (NPA) based on the network design and optical impairments. The Commissioning File is uploaded to each GMRE node and is used by the CSPF algorithm to find a suitable path for the LSP. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, Network Planning Application (NPA) | Nokia
NEW QUESTION # 32
How do you configure the Trail template in NFM-T for an Uplink board (such as 2UC400) in an MRN network with LO and LI restoration capabilities?
- A. Check the Logical Link box
Set the Port Type to Unterminated Check the ASON Routed box Check the ASON Tunnel box - B. Check the Logical Link box
Set the Port Type to Unterminated Check the ASON Routed box Uncheck the ASON Tunnel box - C. Uncheck the Logical Link box Set the Port Type to Terminated Check the ASON Routed box Uncheck the ASON Tunnel box
- D. Uncheck the Logical Link box Set the Port Type to Terminated Check the ASON Routed box Check the ASON Tunnel box
Answer: B
Explanation:
Explanation
To configure the Trail template in NFM-T for an Uplink board (such as 2UC400) in an MRN network with LO and LI restoration capabilities, you need to check the Logical Link box, set the Port Type to Unterminated, check the ASON Routed box, and uncheck the ASON Tunnel box. This configuration allows you to create a logical link between two Uplink boards that can be used for LO or LI restoration. The logical link is not terminated at the Uplink board, but at the OTU board. The ASON Routed option enables the GMPLS control plane for the logical link, while the ASON Tunnel option is not applicable for Uplink boards. References : Nokia Advanced Optical Network Management with NFM-T Course | Nokia, Nokia 1830 PSS-4, PSS-8, PSS-16 and PSS-32 Platforms - NATO
NEW QUESTION # 33
What does Test Mode do in an SNC?
- A. Source nodes of affected client services will not be notified in case of failure
- B. It clears the ASONTOPO alarms
- C. The LSP will not be restored and will behave like an unprotected service
- D. It initiates the LMP link verification by sending Test Messages
Answer: D
Explanation:
Explanation
Test Mode is a feature of the Link Management Protocol (LMP) that allows testing the connectivity and functionality of a link or a TE-link. Test Mode can be initiated by either end of a link or a TE-link by sending a Test Message with a Test ID and a Test Pattern. The Test Message is sent over the control channel of the link or the TE-link and contains information such as the source and destination IP addresses, the link ID, and the test parameters. The receiving node then verifies the Test Message and sends back a TestStatusAck message with the same Test ID and Test Pattern. The TestStatusAck message indicates whether the test was successful or not, and if not, what was the reason for failure. Test Mode can be used to check if a link or a TE-link is operational, if it has any errors or faults, or if it supports certain features or capabilities. References : Nokia GMPLS-controlled Optical Networks Course | Nokia, RFC 4204 - Link Management Protocol (LMP)
NEW QUESTION # 34
What does an SNC state of lower case "n" mean for a resource in NFM-T?
- A. Indicates the nominal resource on a TE-link that is not in use
- B. Indicates it's using a link other than the Nominal
- C. Indicates if s a higher alarm state level
- D. Indicates it's currently using the Nominal resource assigned to it
Answer: A
Explanation:
Explanation
The SNC state is a parameter that indicates the status of a resource in a GMPLS network. A resource can be a link, a wavelength, a timeslot, or a fiber. The SNC state can have different values, such as N, n, P, p, R, r, and so on. Each value has a specific meaning and implication for the resource and the LSP that uses it. The SNC state of lower case "n" means that the resource is the nominal resource on a TE-link that is notin use. A nominal resource is the default or preferred resource that is assigned to an LSP when it is created. A TE-link is a logical link that represents a set of resources that share the same attributes and constraints. A TE-link can have multiple resources, such as wavelengths or timeslots, but only one of them can be the nominal resource.
If an LSP is using a resource other than the nominal resource on a TE-link, it means that the LSP has been rerouted or switched due to a failure or a constraint violation. In this case, the SNC state of the nominal resource will be "n", indicating that it is not in use by any LSP12. References:
* 1: Nokia GMPLS-controlled Optical Networks Course | Nokia
* 2: Nokia Network Functions Manager for Transport User Guide | Nokia
NEW QUESTION # 35
Which label is swapped in an MPLS label stack at an intermediate node?
- A. The label with the highest value
- B. The label on the bottom
- C. The label on the top
- D. The label with the lowest value
Answer: C
Explanation:
Explanation
The label on the top of the MPLS label stack is swapped at an intermediate node. This is because the top label is the one that is visible to the node and determines the forwarding decision. The node looks up the top label in its label forwarding table and swaps it with a new label that corresponds to the next hop or destination. The node then forwards the packet to the next node, which repeats the same process. The bottom label is only used to indicate the end of the label stack and is not swapped. References : [Nokia GMPLS-controlled Optical Networks Course | Nokia], [MPLS Label Stack - Nokia]
NEW QUESTION # 36
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Nokia 4A0-220 exam is a challenging certification that requires candidates to have a deep understanding of GMPLS-controlled optical networks and Nokia equipment. 4A0-220 exam consists of multiple-choice questions and performance-based tasks that test candidates' ability to configure and troubleshoot optical networks using Nokia equipment. Candidates must score at least 70% on the exam to pass and earn the certification.
The Nokia GMPLS-Controlled Optical Networks certification exam is designed to validate the candidate's knowledge and expertise in GMPLS-controlled optical networks. Nokia is a global leader in telecommunications and networking technologies, and achieving certification through the Nokia 4A0-220 exam can demonstrate that the candidate has a deep understanding of optical networks and can design and implement network solutions that meet industry standards. Additionally, this certification can increase the candidate's chances of career advancement and provide them with networking opportunities within the telecommunications industry.
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