完全版は2023年最新の4A0-116試験問題集テストガイドはトレーニング専門問題
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Nokiaのセグメントルーティング技術に関するITプロフェッショナルの知識とスキルをテストするために設計された認定試験であるNokia 4A0-116試験。この試験は、Nokiaのセグメントルーティング技術で認定を取得し、この分野の専門知識を証明したい個人を対象としています。 Nokia 4A0-116試験は、ネットワーク設計と実装のスキルと知識を向上させたいITプロフェッショナルにとって最も重要な試験の1つです。
質問 # 10
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, R2, R4, R6
- B. R1, R6
- C. R1, R5, R6
- D. R1, R3, R5, R6
正解：D
質問 # 11
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?
- A. The amount of bandwidth reserved for each of the existing LSP paths
- B. The IGP link-state database
- C. The traffic-engineering database
- D. The operational state of existing LSP paths
正解：B
質問 # 12
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 a BGP session using the BGP-LS address family with router R3
- B. Establishing IGP adjacencies with routers R1 and R2
- C. Establishing BGP sessions using the BGP-LS address family with routers R3 and R4
- D. Establishing an IGP adjacency with router R2
正解：C
質問 # 13
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. Utilizing redundant links.
- C. Avoiding potential congestion points in the network.
- D. Defining traffic paths based on various constraints.
正解：A
質問 # 14
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 periodically try to calculate a new path at a rate defined by the retry timer.
- 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 continue forwarding traffic to the current next-hop indefinitely, which will be discarded at the point of failure.
正解：D
解説：
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.
質問 # 15
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 underlying routing protocol being used in the network for segment routing is IS-IS.
- B. Router Rl participates in at least two flex-algo instances.
- C. The Node-SID assigned to router RIO for flex-algo instance 129 is 524338.
- D. Router RIO participates in flex-algo instance 130.
正解：C
質問 # 16
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?
- A. R1, R3, R4 and R6
- B. R1, R2, R5 and R6
- C. R1, R3, R2, R5, R4 and R6
- D. R1, R2, R4 and R6
正解：A
質問 # 17
Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?
- A. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
- B. The number of hops included in the end-to-end path is reduced.
- C. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- D. The path calculation can be delegated to an external path computation element (PCE).
正解：B
解説：
Once a path is associated with an LSP, it cannot be used by other LSPs is False. A path can be used by multiple LSPs, but each LSP can have different attributes like bandwidth, priority and other constraints.
質問 # 18
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. Standard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.
- C. Only standard LFA is enabled on router R1; fast re-route is not enabled on router R2.
- D. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
正解：D
質問 # 19
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.
正解：A
解説：
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.
質問 # 20
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 for which the initial path is calculated 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.
正解：C
解説：
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.
質問 # 21
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. 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.
- D. On a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.
正解：D
解説：
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.
質問 # 22
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, SRLG that each link belongs to, link status up/down.
- 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, bandwidth availability of each link, SRLG that each link belongs to.
正解：D
解説：
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.
質問 # 23
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. Local Node-SID
- C. SRGB when SRv6 is configured
- D. Adjacency-SIDs
正解：C
解説：
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.
質問 # 24
Which of the following statements about a Segment Routing SID is FALSE?
- A. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- B. An Adjacency-SID does not have to be configured.
- 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.
正解：B
解説：
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.
質問 # 25
Based on the configuration shown for routers R1 and R10, what valid flex-algo definitions exist in the network?
- A. One valid flex-algo definition, using delay as the link metric and including green links.
- B. 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.
- C. No valid flex-algo definitions, because of the conflicting parameters.
- D. One valid flex-algo definition, using te-metric as the link metric and including blue links.
正解：B
質問 # 26
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