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Nokia 4A0-116 exam covers a wide range of topics related to Nokia’s Segment Routing technology. These topics include network design, implementation, configuration, and troubleshooting of Nokia’s Segment Routing solution. 4A0-116 exam is designed to test the candidate’s ability to apply their knowledge and skills to real-world scenarios and to solve complex problems related to Nokia’s Segment Routing technology.
NEW QUESTION # 13
Which of the following statements about a Segment Routing SID is FALSE?
- A. A Node-SID is usually associated with a router's system interface.
- B. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- C. An Adjacency-SID does not have to be configured.
- D. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
Answer: C
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 # 14
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 LSPs with primary and secondary paths
- C. The ability to create LSP paths with bandwidth reservation
- D. The ability to create cross-area TE-constrained LSP 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 # 15
In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?
- A. List of traffic-engineering constraint types available to choose from
- B. Flexibility of configuring each LSP with its own set of traffic-engineering constraints
- C. Label stack size of the encapsulated data packets
- D. Ability to associate one primary and up to two secondary paths to the same LSP
Answer: B
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 # 16
A router participating in SR-TE is advertising a value of Ox11 for the admin-group membership of one of its interfaces. Which of the following statements is TRUE?
- A. The interface belongs to admin group RED, configured with a value of 17.
- B. The interface belongs to three different admin groups.
- C. The interface belongs to four different admin groups.
- D. The interface belongs to two different admin groups.
Answer: D
Explanation:
In SR-TE, the admin-group is represented by a 32-bit value, where each bit represents a different admin-group. The value Ox11 in binary is 000100010001, which has two bits set to 1, indicating that the interface belongs to two different admin groups. The exact admin-groups that the interface belongs to depends on how the admin-groups have been configured on the router.
NEW QUESTION # 17
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 # 18
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, R2, R4, R6
- B. R1, R6
- C. R1, R5, R6
- D. R1, R3, R5, R6
Answer: D
NEW QUESTION # 19
Which of the following statements about Multi-Protocol Label Switching networks is FALSE?
- A. MPLS uses a signaling protocol to exchange labels between routers.
- B. An LSR forwards data based on the MPLS labels.
- C. The data is transparently carried from end to end.
- D. An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
Answer: C
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 # 20
Loopfree-alternate has been enabled on a router for its link-state routing protocol. For which types of segments will the router attempt to find a backup path, so that they become protected by fast re-route?
- A. Only segments defined by an Adjacency-SID.
- B. Only segments defined by a Node-SID.
- C. No segments, unless segment-routing fast-reroute is also explicitly enabled.
- D. Segments defined by a Node-SID and segments defined by an Adjacency-SID.
Answer: D
Explanation:
Loopfree-alternate is a mechanism that enables fast re-route for link-state routing protocols, it allows the router to find a backup path for both Node-SID and Adjacency-SID segments, so that they become protected by fast re-route.
NEW QUESTION # 21
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 for the OSPF links that have both MPLS and RSVP enabled.
- B. The TE information will be advertised for all the OSPF links that have MPLS enabled.
- C. The TE information will only be advertised using application-specific sub-TLVs.
- 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 # 22
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 # 23
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. A seamless-BFD template needs to be configured on the head-end of the LSP.
- C. The routing protocol (OSPF or IS-IS) is used to carry the reflector discriminator information.
- D. To be able to respond to seamless-BFD messages, a router must be configured as a reflector.
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 # 24
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 number of hops included in the end-to-end path is reduced.
- B. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
- C. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- D. The path calculation can be delegated to an external path computation element (PCE).
Answer: A
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 # 25
In the context of a network that includes a Path Computation Element (PCE), what is a PCC-initiated LSP?
- A. An LSP for which the initial path is calculated by the head-end router.
- 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 whose existence and state are reported to the PCE.
Answer: D
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 # 26
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?
- A. 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.
- 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. 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.
- 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: 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 # 27
Based upon the exhibit, which of the following statements regarding the configuration is FALSE?
- A. Adjacency-SID labels will not be advertised as they have not been defined under the physical interfaces.
- B. The Node-SID assigned to this router is the second label in the defined range.
- C. Traffic engineering has been enabled on this router.
- D. Traffic engineering information will only be advertised for the interfaces that have both MPLS and RSVP enabled.
Answer: D
NEW QUESTION # 28
Which of the following statements about a Segment Routing SID is FALSE?
- A. A Node-SID is usually associated with a router's system interface.
- B. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- C. An Adjacency-SID does not have to be configured.
- D. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
Answer: C
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 # 29
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Nokia 4A0-116 exam, also known as the Nokia SRA (Segment Routing) exam, is a certification exam that is designed for IT professionals who want to validate their skills and knowledge in implementing and managing Nokia's Segment Routing technology. 4A0-116 exam is intended for those who work with Nokia's Service Router Operating System (SR OS) and are involved in designing, configuring, and troubleshooting networks using Segment Routing.
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