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Nokia 4A0-116 exam is an important certification for professionals who work in the networking industry, as it demonstrates a high level of expertise in a critical area of network technology. It is also a valuable credential for those who are looking to advance their careers, as it can open up new job opportunities and increase earning potential.
NEW QUESTION # 19
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. Bandwidth availability as a link attribute cannot be configured.
- D. One interface can belong to an admin group and SRLG group at the same time.
Answer: C
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 # 20
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. Configuring at least one router in the network to create and advertise the flex-algo definition.
- C. Configuring LSPs between every pair of PE routers.
- D. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
Answer: B
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 # 21
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. 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.
- C. 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.
- 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: C
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 # 22
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. Traffic Engineering Info
- C. Extended Link Info
- D. Router Info
Answer: D
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 # 23
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. MPLS label range reserved for Segment Routing.
- C. The Segment Routing Global Block range.
- D. Enable interfaces used for Segment Routing under
Answer: D
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 # 24
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 for which the initial path is calculated by 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 # 25
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?
- A. The traffic-engineering database
- B. The IGP link-state database
- C. The amount of bandwidth reserved for each of the existing LSP paths
- D. The operational state of existing LSP paths
Answer: B
NEW QUESTION # 26
Which of the following is NOT one of the main goals of traffic engineering?
- A. Avoiding potential congestion points in the network.
- B. Defining traffic paths based on various constraints.
- C. Using the shortest possible path through the network to the destination.
- D. Utilizing redundant links.
Answer: C
NEW QUESTION # 27
Which of the following statements about a Segment Routing SID is FALSE?
- A. All routers do NOT need to have the same SRGB range configured.
- B. A local Node-SID can be configured directly as an MPLS label.
- C. A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.
- D. A local Node-SID can be configured as an index.
Answer: C
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 # 28
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?
- A. R1, R2, R5 and R6
- B. R1, R2, R4 and R6
- C. R1, R3, R2, R5, R4 and R6
- D. R1, R3, R4 and R6
Answer: D
NEW QUESTION # 29
Based on the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE?
- A. Only standard LFA is enabled on both routers R1 and R2.
- B. Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.
- C. Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router 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 # 30
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 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.
- C. It selects an immediate neighbor.
- D. It selects a remote router, reachable through a tunnel defined by a single Node-SID.
Answer: B
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 # 31
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, R3, R5, R6
- B. R1, R6
- C. R1, R5, R6
- D. R1, R2, R4, R6
Answer: A
NEW QUESTION # 32
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 # 33
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. 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 # 34
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 IGP adjacencies with routers R1 and R2
- B. Establishing an IGP adjacency with router 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 # 35
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