Free 2023 Nokia Service Routing Architect 4A0-116 dumps are available on Google Drive shared by Exams-boost
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To pass the Nokia 4A0-116 certification exam, candidates must demonstrate their understanding of the fundamentals of Nokia Segment Routing technology, including its architecture, protocols, and deployment models. 4A0-116 exam also tests the candidate's ability to configure and troubleshoot Nokia Segment Routing networks, as well as their knowledge of advanced topics such as network slicing and path optimization. Passing this certification exam validates the candidate's skills and knowledge in Nokia Segment Routing technology, which can help them advance their careers and improve their job prospects in the networking industry.
NEW QUESTION # 15
Which of the following list of SR-TE attributes has to be advertised among routers?
- A. Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to.
- B. Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to.
- C. Administrative groups that each link belongs to, TE metric of links, bandwidth availability of each link, SRLG that each link belongs to, link status up/down.
- D. Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to, link status up/down.
Answer: B
Explanation:
In SR-TE, routers need to advertise certain attributes of their links to other routers in the network in order to calculate traffic-engineered paths. These attributes include:
Administrative groups that each link belongs to: This information is used to restrict the use of certain links to specific traffic types or groups.
TE metric of links: This information is used to calculate the cost of using a particular link for a traffic-engineered path.
Bandwidth availability of each link: This information is used to control the amount of traffic that can be sent over a particular link.
SRLG that each link belongs to: This information is used to avoid routing over the same physical link. Link status up/down is not needed to be advertised as it is part of the IGP protocol and is used to check the reachability of a link.
NEW QUESTION # 16
Which of the following is NOT one of the main goals of traffic engineering?
- A. Avoiding potential congestion points in the network.
- B. Utilizing redundant links.
- C. Defining traffic paths based on various constraints.
- D. Using the shortest possible path through the network to the destination.
Answer: D
NEW QUESTION # 17
In the context of a network that includes a Path Computation Element (PCE), what is a PCC-initiated LSP?
- A. An LSP that needs to be explicitly configured on the head-end router.
- B. An LSP whose existence and state are reported to the PCE.
- C. An LSP for which the initial path is calculated by the head-end router.
- D. An LSP for which the path repairs and re-optimizations must be triggered by the head-end router.
Answer: B
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 # 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, R6
- B. R1, R5, R6
- C. R1, R3, R5, R6
- D. R1, R2, R4, R6
Answer: C
NEW QUESTION # 19
For any of the LFA methods to work properly, there must be a router in the backup path that will forward traffic addressed to the destination without sending it back to the source. Which of the following statements describes the way R-LFA selects such a router?
- A. It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.
- B. It selects an immediate neighbor.
- C. It selects a remote router, reachable through a tunnel defined by a single Node-SID.
- D. It can select an immediate neighbor or a remote router, as long as the backup path coincides with the path that will become active after IGP reconvergence.
Answer: D
Explanation:
R-LFA (Remote Loop-Free Alternate) is a method that can select either an immediate neighbor or a remote router to be used as a backup next hop, as long as the backup path coincides with the path that will become active after IGP reconvergence.
NEW QUESTION # 20
Which of the following statements about Segment Routing is FALSE?
- A. For TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.
- B. Intermediate routers do not maintain any tunnel informal
- C. No path signaling is required to establish an SR tunnel.
- D. A link-state IGP is required to distribute SID information.
Answer: B
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 # 21
Which of the following statements about a Segment Routing SID is FALSE?
- A. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- B. A Node-SID is usually associated with a router's system interface.
- C. An Adjacency-SID does not have to be configured.
- D. A Prefix-SID can be configured directly as a label value or indirectly as an index.
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 # 22
Which of the following statements about a Segment Routing SID is FALSE?
- A. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- B. A Node-SID is usually associated with a router's system interface.
- C. An Adjacency-SID does not have to be configured.
- D. A Prefix-SID can be configured directly as a label value or indirectly as an index.
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 # 23
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 # 24
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. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
- C. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
- D. Once a path is associated with an LSP, it cannot be used by other LSPs.
Answer: A
NEW QUESTION # 25
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 LSP paths with bandwidth reservation
- C. The ability to create LSPs with primary and secondary paths
- 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 # 26
OSPF type-10 Opaque LSAs can carry different types of advertisements. What type of advertisement carries a router's local 5RGB information?
- A. Extended Link Info
- B. Router Info
- C. Extended Prefix Info
- D. Traffic Engineering Info
Answer: B
Explanation:
This type of advertisement carries a router's local SRGB information, which is used to distribute information about the local SID allocation range
NEW QUESTION # 27
Which of the following statements about the operation of seamless-BFD is FALSE?
- A. A seamless-BFD template needs to be configured on the head-end of the LSP.
- B. To be able to respond to seamless-BFD messages, a router must be configured as a reflector.
- C. The routing protocol (OSPF or IS-IS) is used to carry the reflector discriminator information.
- D. Seamless-BFD responses are sent back using the LSP label stack.
Answer: D
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 # 28
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. An R-LFA path that would not coincide with the path after IGP re-convergence.
- C. A D-LFA path that would not coincide with the path after IGP re-convergence.
- D. A D-LFA path that would coincide with the path after IGP re-convergence.
Answer: D
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 # 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, which will be discarded at the point of failure.
- B. The head end will continue forwarding traffic to the current next-hop indefinitely, and R2 will redirect the traffic to R3 after IGP reconvergence.
- 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: A
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
When OSPF is used to support Segment Routing, the first byte of the link-state ID associated with each of the opaque LSAs indicates the type of information being advertised. Which of the following associations between the first-byte value and its meaning is FALSE?
- A. Value 7 - SRGB Range
- B. Value 1 - Traffic Engineering
- C. Value 8 - Extended Link Info
- D. Value 4 - Router Info
Answer: C
Explanation:
Value 8 - Extended Link Info: This statement is not true, value 8 is not used to indicate Extended Link Info. It is used for different types of information, such as Link-Local/Remote Identifiers (LLS/RLS) Identifiers and Node SID/Adj-SID.
NEW QUESTION # 31
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