[Oct-2023] Pass 4A0-116 Exam in First Attempt Updated 4A0-116 Exam Questions
Nokia Service Routing Architect Dumps 4A0-116 Exam for Full Questions - Exam Study Guide
Nokia 4A0-116 certification exam consists of multiple-choice questions that cover a wide range of topics related to segment routing. 4A0-116 exam is designed to test the candidate's understanding of the key concepts and principles of segment routing, as well as their ability to apply this knowledge to real-world scenarios. 4A0-116 exam is challenging and requires a strong understanding of networking concepts, but it is also highly rewarding for those who pass.
NEW QUESTION # 13
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. 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.
- 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. 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.
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 # 14
Which of the following statements about primary and secondary SR-TE LSP paths is FALSE?
- A. The primary path is always preferred over a secondary pa
- B. Preference values can be configured for non-standby secondary paths.
- C. Only one LSP path forwards the traffic at any time,
- D. Up to three paths can be configured for a given SR-TE LS
Answer: D
Explanation:
Typically, in SR-TE, only two paths can be configured for a given SR-TE LSP: primary path and secondary path. The primary path is used for normal traffic forwarding, and the secondary path is used as a backup in case the primary path fails. Only one LSP path forwards the traffic at any time.
NEW QUESTION # 15
Which of the following is NOT one of the main goals of traffic engineering?
- A. Utilizing redundant links.
- B. Defining traffic paths based on various constraints.
- C. Using the shortest possible path through the network to the destination.
- D. Avoiding potential congestion points in the network.
Answer: C
NEW QUESTION # 16
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: A
NEW QUESTION # 17
Which of the following statements about a Segment Routing SID is FALSE?
- A. An Adjacency-SID does not have to be configured.
- B. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- C. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- 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 # 18
Based on the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE?
- A. Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.
- B. Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.
- C. Only standard LFA is enabled on both routers R1 and R2.
- D. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
Answer: D
NEW QUESTION # 19
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 R5, which is the shortest way to go back to the original path.
- B. To reach router R4, which is the tail-end of the active segment.
- C. To reach router R8, which is the tail-end of the LSP.
- D. To reach router R2, which is the LSP's intended next-hop.
Answer: A
NEW QUESTION # 20
Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?
- A. Enable interfaces used for Segment Routing under
- B. The Segment Routing Global Block range.
- C. The flooding scope of Segment Routing information.
- D. MPLS label range reserved for Segment Routing.
Answer: A
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 # 21
To create a flex-algo instance in a network, which of the following configuration steps is mandatory?
- A. Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
- B. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
- C. Configuring at least one router in the network to create and advertise the flex-algo definition.
- D. Configuring LSPs between every pair of PE routers.
Answer: C
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 # 22
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 # 23
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 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.
- D. It selects a remote router, reachable through a tunnel defined by a single Node-SID.
Answer: C
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 # 24
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 IGP link-state database
- C. The amount of bandwidth reserved for each of the existing LSP paths
- D. The traffic-engineering database
Answer: B
NEW QUESTION # 25
Which of the following statements about Segment Routing tunnels is FALSE?
- A. For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.
- B. A Segment Routing tunnel can be defined by multiple Node-SIDs.
- 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: A
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 # 26
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. No path signaling is required to establish an SR tunnel.
- C. A link-state IGP is required to distribute SID information.
- D. Intermediate routers do not maintain any tunnel informal
Answer: D
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 # 27
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, bandwidth availability of each link, 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, link status up/down.
- C. Administrative groups that each link belongs to, TE metric of links, 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.
Answer: A
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 # 28
Based on the exhibit, which of the following is a viable option for the Path Computation Element (PCE) to obtain all the necessary topology and traffic-engineering information from the network, so that it can calculate LSP paths on behalf of the PE routers?
- A. Establishing an IGP adjacency with router R2
- B. Establishing IGP adjacencies with routers R1 and R2
- C. Establishing a BGP session using the BGP-LS address family with router R3
- D. Establishing BGP sessions using the BGP-LS address family with routers R3 and R4
Answer: D
NEW QUESTION # 29
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