Ultimate Guide to Prepare Free Nokia 4A0-116 Exam Questions and Answer
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Nokia 4A0-116 exam, also known as the Nokia Segment Routing exam, is a certification exam designed to test the knowledge and skills of professionals in the field of networking. 4A0-116 exam is intended for those who wish to become experts in the field of segment routing, which is a new type of routing technology that is becoming increasingly popular in the networking industry.
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.
Nokia 4A0-116 (Nokia Segment Routing) Certification Exam is designed to validate the skills and knowledge of professionals in the field of networking. 4A0-116 exam covers advanced concepts and techniques related to segment routing technology, which is widely used in modern networking environments. Nokia Segment Routing Exam certification is highly respected in the industry and is recognized by major companies worldwide.
NEW QUESTION # 21
Which of the following statements about Segment Routing tunnels is FALSE?
- A. A Segment Routing tunnel can be defined by multiple Node-SIDs.
- B. For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.
- C. A Segment Routing tunnel can be defined by a combination of Node-SIDs and Adjacency-SIDs.
- D. A Segment Routing tunnel defined by a Node-SID uses the shortest IGP Path.
Answer: B
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 # 22
Which of the following statements about path definitions is FALSE?
- A. Once a path is associated with an LSP, it cannot be used by other LSPs.
- B. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
- C. The path hops can be defined by either the system or physical interface IP address.
- D. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
Answer: C
NEW QUESTION # 23
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. Router Rl participates in at least two flex-algo instances.
- C. Router RIO participates in flex-algo instance 130.
- D. The underlying routing protocol being used in the network for segment routing is IS-IS.
Answer: A
NEW QUESTION # 24
Which of the following statements about SR-TE administrative constraints is FALSE?
- A. Shared-Risk-Link Groups are only taken into account when calculating the secondary path.
- B. The head-end router may calculate a path that takes into account max hop count and bandwidth constraints.
- C. The TE metric for a link is by default the same as the IGP metric.
- D. A strict hop must be adjacent to the previous hop in the list.
Answer: A
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 # 25
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 retry timer.
- D. The head end will periodically try to calculate a new path at a rate defined by the resignal 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 # 26
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 # 27
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 whose existence and state are reported to the PCE.
- D. An LSP that needs to be explicitly configured on 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 # 28
Which of the following is not required to be advertised by a router participating in Segment Routing?
- A. Support for SR-MPLS for IPv4 or IPv6, or SRv6
- B. SRGB when SRv6 is configured
- C. Local Node-SID
- D. Adjacency-SIDs
Answer: B
Explanation:
SRGB when SRv6 is configured: This is not required to be advertised, SRGB(Segment Routing Global Block) is only used for SR-MPLS and is not needed when SRv6 is configured. Instead, SRv6 uses the IANA-assigned IPv6 address space.
NEW QUESTION # 29
Which of the following statements about a Segment Routing SID is FALSE?
- A. An Adjacency-SID does not have to be configured.
- B. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- C. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- D. A Node-SID is usually associated with a router's system interface.
Answer: A
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 # 30
Which of the following statements about Multi-Protocol Label Switching networks is FALSE?
- A. An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
- B. MPLS uses a signaling protocol to exchange labels between routers.
- C. The data is transparently carried from end to end.
- D. An LSR forwards data based on the MPLS labels.
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 # 31
Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?
- A. The flooding scope of Segment Routing information.
- B. The Segment Routing Global Block range.
- 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 # 32
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 cross-area TE-constrained LSP paths
- C. The ability to ensure that some LSP paths are disjoint
- D. The ability to create LSP paths with bandwidth reservation
Answer: D
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 # 33
Which of the following is NOT one of the main goals of traffic engineering?
- A. Using the shortest possible path through the network to the destination.
- B. Avoiding potential congestion points in the network.
- C. Utilizing redundant links.
- D. Defining traffic paths based on various constraints.
Answer: A
NEW QUESTION # 34
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 # 35
OSPF type-10 Opaque LSAs can carry different types of advertisements. What type of advertisement carries a router's local 5RGB information?
- A. Extended Prefix Info
- B. Router Info
- C. Extended Link 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 # 36
Which of the following statements about segment routing fast re-route is FALSE?
- A. The parameter "max-sr-frr-labels" limits the number of labels that R-LFA can add to the data packet encapsulation.
- B. Fast re-route is a temporary fix that becomes active for a short period of time after a local network failure.
- C. On a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.
- D. 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.
Answer: C
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 # 37
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