4A0-116 Dumps To Pass Nokia Service Routing Architect Exam in One Day (Updated 42 Questions)
4A0-116 Exam Brain Dumps - Study Notes and Theory
Nokia 4A0-116 Exam Syllabus Topics:
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NEW QUESTION 11
Based upon the exhibit, which of the following statements regarding the configuration is FALSE?
- A. Traffic engineering information will only be advertised for the interfaces that have both MPLS and RSVP enabled.
- B. Adjacency-SID labels will not be advertised as they have not been defined under the physical interfaces.
- C. The Node-SID assigned to this router is the second label in the defined range.
- D. Traffic engineering has been enabled on this router.
Answer: A
NEW QUESTION 12
To create a flex-algo instance in a network, which of the following configuration steps is mandatory?
- A. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
- 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. Configuring the proper values for the shared-risk link groups (SRLGs) that will define the flex-algo topology.
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 13
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 traffic-engineering database
- D. The amount of bandwidth reserved for each of the existing LSP paths
Answer: B
NEW QUESTION 14
Which of the following is not required to be advertised by a router participating in Segment Routing?
- A. Adjacency-SIDs
- B. SRGB when SRv6 is configured
- C. Support for SR-MPLS for IPv4 or IPv6, or SRv6
- D. Local Node-SID
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 15
Which of the following steps is NOT required when configuring IS-IS to support Segment Routing?
- A. The Segment Routing Global Block range.
- B. MPLS label range reserved for Segment Routing.
- C. Enable interfaces used for Segment Routing under
- D. The flooding scope of Segment Routing information.
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 16
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 17
Based on the configuration shown for routers R1 and R10, what valid flex-algo definitions exist in the network?
- A. Two valid flex-algo definitions, one uses te-metric as the link metric and includes blue links and the other uses delay as the link met includes green links.
- B. No valid flex-algo definitions, because of the conflicting parameters.
- C. One valid flex-algo definition, using delay as the link metric and including green links.
- D. One valid flex-algo definition, using te-metric as the link metric and including blue links.
Answer: A
NEW QUESTION 18
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 a remote router, reachable through a tunnel defined by a single Node-SID.
- 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 an immediate neighbor.
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 19
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 20
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 21
Which of the following statements about path definitions is FALSE?
- A. In addition to the hops defined in the path list, the head-end and tail-end routers are implicitly added.
- B. A loose hop is one that does not have to be directly adjacent to the previous hop in the path list
- C. The path hops can be defined by either the system or physical interface IP address.
- D. Once a path is associated with an LSP, it cannot be used by other LSPs.
Answer: C
NEW QUESTION 22
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 cross-area TE-constrained LSP paths
- D. The ability to create LSPs with primary and secondary 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 23
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 4 - Router Info
- C. Value 1 - Traffic Engineering
- D. Value 8 - Extended Link Info
Answer: D
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 24
Which of the following statements about the operation of seamless-BFD is FALSE?
- A. To be able to respond to seamless-BFD messages, a router must be configured as a reflector.
- B. Seamless-BFD responses are sent back using the LSP label stack.
- C. The routing protocol (OSPF or IS-IS) is used to carry the reflector discriminator information.
- D. A seamless-BFD template needs to be configured on the head-end of the LSP.
Answer: B
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 25
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. A local Node-SID can be configured as an index.
- D. All routers do NOT need to have the same SRGB range configured.
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 26
Loopfree-alternate has been enabled on a router for its link-state routing protocol. For which types of segments will the router attempt to find a backup path, so that they become protected by fast re-route?
- A. Segments defined by a Node-SID and segments defined by an Adjacency-SID.
- B. Only segments defined by a Node-SID.
- C. No segments, unless segment-routing fast-reroute is also explicitly enabled.
- D. Only segments defined by an Adjacency-SID.
Answer: A
Explanation:
Loopfree-alternate is a mechanism that enables fast re-route for link-state routing protocols, it allows the router to find a backup path for both Node-SID and Adjacency-SID segments, so that they become protected by fast re-route.
NEW QUESTION 27
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