[May 02, 2023] New Nokia 4A0-116 Dumps with Test Engine and PDF (New Questions)
Pass Your 4A0-116 Exam Easily - Real 4A0-116 Practice Dump Updated
NEW QUESTION # 25
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, R6
- B. R1, R2, R4, R6
- C. R1, R5, R6
- D. R1, R3, R5, R6
Answer: D
NEW QUESTION # 26
Which of the following statements about a Segment Routing SID is FALSE?
- A. A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.
- B. A local Node-SID can be configured directly as an MPLS label.
- C. All routers do NOT need to have the same SRGB range configured.
- D. A local Node-SID can be configured as an index.
Answer: A
Explanation:
A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index: This statement is not true, A router will advertise its local Node-SID as a local SRGB and an index, whether it is configured as an index or not.
NEW QUESTION # 27
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 # 28
Which of the following statements about enabling and using traffic engineering for Segment Routing is FALSE?
- A. A link attribute has to be assigned to a particular interface under the [/configure router interface] context
- 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. Bandwidth availability as a link attribute cannot be configured.
Answer: D
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 # 29
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 # 30
Which of the following statements about segment routing fast re-route is FALSE?
- A. Fast re-route typically protects the active segment of a tunnel, but under certain conditions it can protect an end-to-end multi-segment tunnel instead.
- B. Fast re-route is a temporary fix that becomes active for a short period of time after a local network failure.
- C. The parameter "max-sr-frr-labels" limits the number of labels that R-LFA can add to the data packet encapsulation.
- D. On a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.
Answer: D
Explanation:
On a Nokia 7750 SR, R-LFA and TI-LFA cannot be enabled independently; they must be enabled together. The parameter "max-sr-frr-labels" limits the number of labels that R-LFA can add to the data packet encapsulation.
NEW QUESTION # 31
Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?
- A. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
- B. The path calculation can be delegated to an external path computation element (PCE).
- C. The number of hops included in the end-to-end path is reduced.
- D. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
Answer: C
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 # 32
Based on the exhibit, and given that the system IP address of router RIO is 10.10.10.10, which of the following statements is FALSE?
- A. The Node-SID assigned to router RIO for flex-algo instance 129 is 524338.
- B. The underlying routing protocol being used in the network for segment routing is IS-IS.
- C. Router Rl participates in at least two flex-algo instances.
- D. Router RIO participates in flex-algo instance 130.
Answer: A
NEW QUESTION # 33
In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?
- A. Label stack size of the encapsulated data packets
- B. List of traffic-engineering constraint types available to choose from
- C. Flexibility of configuring each LSP with its own set of traffic-engineering constraints
- D. Ability to associate one primary and up to two secondary paths to the same LSP
Answer: C
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 # 34
Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?
- A. The Segment Routing Global Block range.
- B. The flooding scope of Segment Routing information.
- C. Enable interfaces used for Segment Routing under
- D. MPLS label range reserved for Segment Routing.
Answer: C
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 # 35
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 # 36
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?
- A. R1, R3, R2, R5, R4 and R6
- B. R1, R3, R4 and R6
- C. R1, R2, R4 and R6
- D. R1, R2, R5 and R6
Answer: B
NEW QUESTION # 37
Which of the following statements about path definitions is FALSE?
- A. The path hops can be defined by either the system or physical interface IP address.
- B. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
- C. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
- D. Once a path is associated with an LSP, it cannot be used by other LSPs.
Answer: A
NEW QUESTION # 38
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 extended-link opaque LSAs.
- B. The TE information will only be advertised using application-specific sub-TLVs.
- C. The TE information will be advertised for all the OSPF links that have MPLS enabled.
- D. The TE information will only be advertised for the OSPF links that have both MPLS and RSVP enabled.
Answer: A
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 # 39
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. 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.
- D. 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.
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 # 40
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 path repairs and re-optimizations must be triggered by the head-end router.
- B. An LSP that needs to be explicitly configured on the head-end router.
- C. An LSP whose existence and state are reported to the PCE.
- D. An LSP for which the initial path is calculated by the head-end router.
Answer: C
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 # 41
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