Nokia New 2023 4A0-116 Test Tutorial (Updated 42 Questions)
4A0-116 Exam Questions Dumps, Selling Nokia Products
In 4A0-116 exam, candidates will be tested on their understanding of the key concepts, features, and functions of Nokia's Segment Routing technology. They will be required to demonstrate their ability to configure and implement Segment Routing in a variety of network scenarios, including virtual private networks (VPNs), quality of service (QoS) policies, and network slicing. Additionally, candidates will be evaluated on their ability to troubleshoot issues related to Segment Routing and provide effective solutions.
Segment routing is a new technology that has emerged in the networking industry as a way to simplify network operations and improve network performance. It is a technique that enables the network to forward packets along a predetermined path without the need for complex protocols or algorithms. By using segment routing, network operators can reduce the complexity of their networks, increase network scalability, and improve network performance.
NEW QUESTION # 23
Which of the following statements about enabling and using traffic engineering for Segment Routing is FALSE?
- A. Bandwidth availability as a link attribute cannot be configured.
- B. The interfaces used for SR-TE LSPs have to be added to the MPLS context.
- C. One interface can belong to an admin group and SRLG group at the same time.
- D. A link attribute has to be assigned to a particular interface under the [/configure router interface] context
Answer: A
Explanation:
Bandwidth availability can be configured as a link attribute in SR-TE, it is used to control the amount of traffic that can be sent over a particular link.
NEW QUESTION # 24
The exhibit highlights in blue the primary path of a segment going from router S to router D.
The exhibit also shows a backup path. The protected link fails and fast re-route is triggered on router S. If the backup path has been calculated using standard LFA, how many SIDs are included in the label stack of the data packet forwarded to router R1?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 25
Based on the configuration shown for routers R1 and R10, what valid flex-algo definitions exist in the network?
- A. Two valid flex-algo definitions, one uses te-metric as the link metric and includes blue links and the other uses delay as the link met includes green links.
- B. No valid flex-algo definitions, because of the conflicting parameters.
- C. One valid flex-algo definition, using delay as the link metric and including green links.
- D. One valid flex-algo definition, using te-metric as the link metric and including blue links.
Answer: A
NEW QUESTION # 26
The exhibit shows the fast re-route configuration on router R1, in which both R-LFA and TI-LFA have been enabled. Assume that there are multiple potential backup paths for a given prefix. Which of the following options will router R1 use?
- A. A standard LFA path that would not coincide with the path after IGP re-convergence.
- B. A D-LFA path that would coincide with the path after IGP re-convergence.
- C. An R-LFA path that would not coincide with the path after IGP re-convergence.
- D. A D-LFA path that would not coincide with the path after IGP re-convergence.
Answer: B
Explanation:
The exhibit shows that both R-LFA and TI-LFA have been enabled on router R1. R-LFA (Remote Loop-Free Alternate) is a method that is used to protect the active segment of a tunnel, and it allows the router to find a backup path that coincides with the path that will become active after IGP reconvergence. TI-LFA (Topology Independent LFA) is a method that is used to protect an end-to-end multi-segment tunnel, it allows the router to find a backup path that does not rely on the IGP topology, but on the segment routing topology.
With R-LFA and TI-LFA enabled, router R1 will use a D-LFA (Dual-Loop-Free Alternate) path, which is a combination of both R-LFA and TI-LFA, this path will coincide with the path after IGP re-convergence.
A standard LFA, R-LFA, and D-LFA which do not coincide with the path after IGP re-convergence are not the options.
NEW QUESTION # 27
Which of the following is NOT an advantage of using a PCE for the computation of TE-constrained LSP paths, as compared to using CSPF locally on the PE router?
- A. The ability to ensure that some LSP paths are disjoint
- B. The ability to create cross-area TE-constrained LSP paths
- C. The ability to create LSP paths with bandwidth reservation
- D. The ability to create LSPs with primary and secondary paths
Answer: C
Explanation:
PCE does not have the capability to reserve bandwidth, This is a function of a Resource Reservation Protocol (RSVP) or a Label Distribution Protocol (LDP) and is done locally on the PE.
PCE can have advantages such as:
The ability to create cross-area TE-constrained LSP paths
The ability to create LSPs with primary and secondary paths
The ability to ensure that some LSP paths are disjoint
it can be used to optimize the path computation by centralizing the path calculation and by taking into account a global view of the network.
NEW QUESTION # 28
Which of the following statements about primary and secondary SR-TE LSP paths is FALSE?
- A. The primary path is always preferred over a secondary pa
- B. Only one LSP path forwards the traffic at any time,
- C. Up to three paths can be configured for a given SR-TE LS
- D. Preference values can be configured for non-standby secondary paths.
Answer: C
Explanation:
Typically, in SR-TE, only two paths can be configured for a given SR-TE LSP: primary path and secondary path. The primary path is used for normal traffic forwarding, and the secondary path is used as a backup in case the primary path fails. Only one LSP path forwards the traffic at any time.
NEW QUESTION # 29
In the context of a network that includes a Path Computation Element (PCE), what is a PCC-initiated LSP?
- A. An LSP whose existence and state are reported to the PCE.
- B. An LSP for which the path repairs and re-optimizations must be triggered by the head-end router.
- C. An LSP that needs to be explicitly configured on the head-end router.
- D. An LSP for which the initial path is calculated by the head-end router.
Answer: A
Explanation:
A PCC-initiated LSP is an LSP that is established and controlled by the PCC (Path Computation Client) which is typically a head-end router. The PCC sends LSP setup and teardown requests to the PCE and also reports the existence and state of the LSPs to the PCE. The PCE then uses this information to perform path computation and to monitor the state of the LSPs.
NEW QUESTION # 30
Which of the following statements about Segment Routing tunnels is FALSE?
- A. A Segment Routing tunnel can be defined by multiple Node-SIDs.
- B. A Segment Routing tunnel can be defined by a combination of Node-SIDs and Adjacency-SIDs.
- C. A Segment Routing tunnel defined by a Node-SID uses the shortest IGP Path.
- D. For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.
Answer: D
Explanation:
an intermediate router in a Segment Routing tunnel may forward packets based on the specific SIDs defined in the Segment Routing tunnel and not always the best IGP path.
NEW QUESTION # 31
Which of the following statements about Multi-Protocol Label Switching networks is FALSE?
- A. An LSR forwards data based on the MPLS labels.
- B. The data is transparently carried from end to end.
- C. An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
- D. MPLS uses a signaling protocol to exchange labels between routers.
Answer: B
Explanation:
The data is transparently carried from end to end: This statement is not true, MPLS does not provide data transparency, which means that the data is not carried unmodified from end to end. MPLS uses labels to forward data, so the original IP packets are encapsulated in new MPLS packets, and the original IP headers are not visible at the egress LSR.
NEW QUESTION # 32
Based on the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE?
- A. Only standard LFA is enabled on both routers R1 and R2.
- B. Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.
- C. Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.
- D. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
Answer: D
NEW QUESTION # 33
Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?
- A. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- B. The number of hops included in the end-to-end path is reduced.
- C. The path calculation can be delegated to an external path computation element (PCE).
- D. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
Answer: B
Explanation:
Once a path is associated with an LSP, it cannot be used by other LSPs is False. A path can be used by multiple LSPs, but each LSP can have different attributes like bandwidth, priority and other constraints.
NEW QUESTION # 34
In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?
- A. Ability to associate one primary and up to two secondary paths to the same LSP
- B. List of traffic-engineering constraint types available to choose from
- C. Label stack size of the encapsulated data packets
- D. Flexibility of configuring each LSP with its own set of traffic-engineering constraints
Answer: D
Explanation:
Flex-Algo LSPs are a type of LSP that allows for greater flexibility in configuring traffic engineering constraints. This is because flex-algo LSPs can be configured with a unique set of traffic engineering constraints for each LSP, whereas SR-TE LSPs use a predefined set of traffic engineering constraints that applies to all LSPs.
Label stack size of the encapsulated data packets, List of traffic-engineering constraint types available to choose from, and Ability to associate one primary and up to two secondary paths to the same LSP are not the advantages of flex-algo LSPs over SR-TE LSPs.
NEW QUESTION # 35
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?
- A. Using a flex-algo Node-SID as an explicit hop in the path definition of an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.
- B. Configuring and applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.
- C. Configuring and applying a VRF import policy to a VPRN service and enabling the sr-is-is or sr-ospf tunnel type for the service, depending on the underlying routing protocol.
- D. Specifying the flex-algo instance ID as an additional TE constraint for an SR-TE LSP and enabling the sr-te tunnel type for a VPN service.
Answer: B
Explanation:
Applying a VSI import policy to an EVPN service and enabling the sr-is-is or sr-ospf tunnel type for the service is not a valid option for steering traffic into a flex-algo segment-routing tunnel, VSI is not related to flex-algo SR.
NEW QUESTION # 36
Which of the following statements about SR-TE administrative constraints is FALSE?
- A. The TE metric for a link is by default the same as the IGP metric.
- B. The head-end router may calculate a path that takes into account max hop count and bandwidth constraints.
- C. Shared-Risk-Link Groups are only taken into account when calculating the secondary path.
- D. A strict hop must be adjacent to the previous hop in the list.
Answer: C
Explanation:
Shared-Risk-Link Groups(SRLG) is taken into account when calculating both primary and secondary path to avoid routing over the same physical link.
NEW QUESTION # 37
Examine the exhibit.
An LSP is being configured to start at R1 and end at R6 using local CSPF. The LSP has the following constraints. Include admin-group GREEN, use the TE metric and hop-limit 3. What routers will be included in the LSP path?
- A. R1, R5, R6
- B. R1, R2, R4, R6
- C. R1, R6
- D. R1, R3, R5, R6
Answer: D
NEW QUESTION # 38
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?
- A. The operational state of existing LSP paths
- B. The traffic-engineering database
- C. The amount of bandwidth reserved for each of the existing LSP paths
- D. The IGP link-state database
Answer: D
NEW QUESTION # 39
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Nokia 4A0-116 exam is a certification test that focuses on Nokia Segment Routing. This is a highly specialized area that is critical to the successful operation of modern communication networks. 4A0-116 exam is designed to test the knowledge and skills of professionals who work in this field, and who are looking to advance their careers by demonstrating their expertise.
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