[Oct 29, 2023] 4A0-116 Exam Brain Dumps - Study Notes and Theory
Pass Nokia 4A0-116 Test Practice Test Questions Exam Dumps
Nokia 4A0-116 (Nokia Segment Routing) Certification Exam is designed for professionals who want to specialize in the area of segment routing. Segment routing is a networking technology that allows network administrators to steer traffic in a more efficient and flexible way. This technology is gaining popularity due to its ability to simplify network operations and improve network performance.
Nokia 4A0-116 certification exam covers a wide range of topics, including the basics of Segment Routing, the implementation of Segment Routing on Nokia routers, the configuration of Segment Routing policies, and the troubleshooting of common issues. It is a comprehensive exam that requires a deep understanding of the technology and its implementation in real-world scenarios.
Achieving the Nokia 4A0-116 (Nokia Segment Routing) Certification demonstrates that a professional has a deep understanding of segment routing and is capable of implementing and managing segment routing solutions. Nokia Segment Routing Exam certification is highly valued by employers who are looking for skilled professionals to manage their network infrastructure. Candidates who pass the Nokia 4A0-116 (Nokia Segment Routing) Certification Exam will have a competitive advantage in the job market and be able to take on more challenging and rewarding roles in the industry.
NEW QUESTION # 12
Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?
- A. MPLS label range reserved for Segment Routing.
- B. The Segment Routing Global Block range.
- C. The flooding scope of Segment Routing information.
- D. Enable interfaces used for Segment Routing under
Answer: D
Explanation:
Enable interfaces used for Segment Routing under: This step is not required, enabling interfaces used for Segment Routing is not necessary as the IS-IS protocol already takes care of the flooding of the routing information.
NEW QUESTION # 13
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 create LSPs with primary and secondary paths
- B. The ability to create LSP paths with bandwidth reservation
- C. The ability to ensure that some LSP paths are disjoint
- D. The ability to create cross-area TE-constrained LSP paths
Answer: B
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 # 14
Which of the following statements about Segment Routing is FALSE?
- A. No path signaling is required to establish an SR tunnel.
- B. For TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.
- C. Intermediate routers do not maintain any tunnel informal
- D. A link-state IGP is required to distribute SID information.
Answer: C
Explanation:
Intermediate routers do not maintain any tunnel informal: this statement is false, Intermediate routers do maintain tunnel information, such as the Forwarding Information Base (FIB) to forward the packets according to the path specified in the packets.
NEW QUESTION # 15
Which of the following statements about the operation of seamless-BFD is FALSE?
- A. Seamless-BFD responses are sent back using the LSP label stack.
- B. The routing protocol (OSPF or IS-IS) is used to carry the reflector discriminator information.
- C. To be able to respond to seamless-BFD messages, a router must be configured as a reflector.
- D. A seamless-BFD template needs to be configured on the head-end of the LSP.
Answer: A
Explanation:
Seamless-BFD is a mechanism that allows the detection of faults in MPLS LSPs more quickly by using BFD (Bidirectional Forwarding Detection) protocol. Seamless-BFD responses are sent back using the MPLS data-plane, not the LSP label stack.
NEW QUESTION # 16
OSPF is being used for segment routing with traffic-engineering (SR-TE). The traffic-engineering option has been set to "sr-te false". Which of the following statements is TRUE?
- A. The TE information will only be advertised using application-specific sub-TLVs.
- B. The TE information will be advertised for all the OSPF links that have MPLS enabled.
- C. The TE information will only be advertised for the OSPF links that have both MPLS and RSVP enabled.
- D. The TE information will only be advertised using extended-link opaque LSAs.
Answer: D
Explanation:
When using Segment Routing with Traffic Engineering (SR-TE) in OSPF, the TE information is advertised using extended-link opaque LSAs. The option "sr-te false" indicates that OSPF will not advertise the TE information in the OSPF database, thus the routers will not be aware of the TE information.
NEW QUESTION # 17
Which of the following statements about enabling and using traffic engineering for Segment Routing is FALSE?
- A. One interface can belong to an admin group and SRLG group at the same time.
- B. The interfaces used for SR-TE LSPs have to be added to the MPLS context.
- C. Bandwidth availability as a link attribute cannot be configured.
- D. A link attribute has to be assigned to a particular interface under the [/configure router interface] context
Answer: C
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 # 18
To create a flex-algo instance in a network, which of the following configuration steps is mandatory?
- A. Configuring LSPs between every pair of PE routers.
- B. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
- C. Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
- D. Configuring at least one router in the network to create and advertise the flex-algo definition.
Answer: D
Explanation:
To create a flex-algo instance in a network, it's mandatory to configure at least one router in the network to create and advertise the flex-algo definition, This is the first step in creating a flex-algo instance, and it's done by defining the flex-algo instance and its properties on one or more routers in the network.
The other steps are important to fine-tune the flex-algo instance, but not mandatory to create it.
Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
Configuring LSPs between every pair of PE routers.
NEW QUESTION # 19
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?
- A. 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.
- B. 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.
- 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. 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.
Answer: A
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 # 20
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 IGP link-state database
- D. The amount of bandwidth reserved for each of the existing LSP paths
Answer: C
NEW QUESTION # 21
Which of the following statements about a Segment Routing SID is FALSE?
- A. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- B. A Node-SID is usually associated with a router's system interface.
- C. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- D. An Adjacency-SID does not have to be configured.
Answer: D
Explanation:
An Adjacency-SID does not have to be configured: this statement is not true, An Adjacency-SID is associated with a neighbor router, it is used to identify an adjacency between two routers. An Adjacency-SID must be configured to identify the adjacency.
NEW QUESTION # 22
Which of the following statements about path definitions is FALSE?
- A. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
- B. The path hops can be defined by either the system or physical interface IP address.
- C. Once a path is associated with an LSP, it cannot be used by other LSPs.
- D. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
Answer: B
NEW QUESTION # 23
Which of the following statements about the Path Computation Element (PCE) is FALSE?
- A. A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re-optimizations.
- B. A stateful PCE can allow LSPs to reserve bandwidth.
- C. A stateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.
- D. The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-LS.
Answer: B
Explanation:
Stateful PCE can monitor the existing LSPs and trigger necessary repairs and re-optimizations, but it does not have the capability to reserve bandwidth.
NEW QUESTION # 24
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?
- A. R1, R2, R5 and R6
- B. R1, R3, R2, R5, R4 and R6
- C. R1, R3, R4 and R6
- D. R1, R2, R4 and R6
Answer: C
NEW QUESTION # 25
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 # 26
The exhibit presents packets being transmitted inside an LSP's multi-segment primary path going from router R1 to router R8. The LSP also has a standby secondary path, and Seamless-BFD has been enabled on the primary path. The link between routers R1 and R2 fails, and fast re-route (FRR) is triggered. As a result, router R1 forwards the packets to router R3 and adds the proper FRR encapsulation to reach which router?
- A. To reach router R8, which is the tail-end of the LSP.
- B. To reach router R2, which is the LSP's intended next-hop.
- C. To reach router R4, which is the tail-end of the active segment.
- D. To reach router R5, which is the shortest way to go back to the original path.
Answer: D
NEW QUESTION # 27
An SR-TE LSP with a path definition that includes router R4 as a loose hop and for which Seamless-BFD has been enabled is following the path shown in the exhibit. What happens after router R4 fails if the routers along the path follow the default behavior?
- A. The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.
- B. The head end will continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.
- C. The head end will periodically try to calculate a new path at a rate defined by the resignal timer.
- D. The head end will periodically try to calculate a new path at a rate defined by the retry timer.
Answer: B
Explanation:
When an SR-TE LSP with Seamless-BFD enabled, the BFD sessions are established between the routers along the path to detect any failures quickly. If a failure happens in the path, the router will stop forwarding the traffic and send a BFD control packet to the head-end router. In this case, R4 failed, BFD sessions will detect the failure and send a message to the head-end router, but since R4 is a loose hop, the path doesn't have to be re-calculate. The head-end router will continue forwarding traffic to the current next-hop, R2, which will be discarded at the point of failure (R4) as it doesn't know about the failure. And the traffic will not be redirected to R3 after IGP reconvergence.
NEW QUESTION # 28
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