更新された2024年01月テストエンジン練習4A0-116問題集と練習試験合格させます
問題集お試しセット4A0-116テストエンジンで問題集トレーニングには42問あります
質問 # 15
Which of the following statements about a Segment Routing SID is FALSE?
- A. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- B. A Node-SID is usually associated with a router's system interface.
- C. An Adjacency-SID does not have to be configured.
- D. A Prefix-SID can be configured directly as a label value or indirectly as an index.
正解：C
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 # 16
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, R4 and R6
- D. R1, R3, R2, R5, R4 and R6
正解：C
質問 # 17
Which of the following is NOT one of the main goals of traffic engineering?
- A. Avoiding potential congestion points in the network.
- B. Utilizing redundant links.
- C. Defining traffic paths based on various constraints.
- D. Using the shortest possible path through the network to the destination.
正解：D
質問 # 18
Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?
- A. The number of hops included in the end-to-end path is reduced.
- B. The path calculation can be delegated to an external path computation element (PCE).
- C. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- D. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
正解：A
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 # 19
Which of the following is not required to be advertised by a router participating in Segment Routing?
- A. Local Node-SID
- B. SRGB when SRv6 is configured
- C. Adjacency-SIDs
- D. Support for SR-MPLS for IPv4 or IPv6, or SRv6
正解：B
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 # 20
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. The flooding scope of Segment Routing information.
- D. Enable interfaces used for Segment Routing under
正解：D
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 # 21
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 R2, which is the LSP's intended next-hop.
- C. To reach router R4, which is the tail-end of the active segment.
- D. To reach router R8, which is the tail-end of the LSP.
正解：A
質問 # 22
Which of the following statements about Segment Routing tunnels is FALSE?
- A. A Segment Routing tunnel can be defined by multiple Node-SIDs.
- B. A Segment Routing tunnel can be defined by a combination of Node-SIDs and Adjacency-SIDs.
- C. A Segment Routing tunnel defined by a Node-SID uses the shortest IGP Path.
- D. For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.
正解：D
解説：
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.
質問 # 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 1 - Traffic Engineering
- C. Value 8 - Extended Link Info
- D. Value 4 - Router Info
正解：C
解説：
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.
質問 # 24
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. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
- D. Only standard LFA is enabled on both routers R1 and R2.
正解：C
質問 # 25
OSPF is being used for segment routing with traffic-engineering (SR-TE). The traffic-engineering option has been set to "sr-te false". Which of the following statements is TRUE?
- A. The TE information will be advertised for all the OSPF links that have MPLS enabled.
- B. The TE information will only be advertised for the OSPF links that have both MPLS and RSVP enabled.
- C. The TE information will only be advertised using application-specific sub-TLVs.
- D. The TE information will only be advertised using extended-link opaque LSAs.
正解：D
解説：
When using Segment Routing with Traffic Engineering (SR-TE) in OSPF, the TE information is advertised using extended-link opaque LSAs. The option "sr-te false" indicates that OSPF will not advertise the TE information in the OSPF database, thus the routers will not be aware of the TE information.
質問 # 26
Which of the following statements about a Segment Routing SID is FALSE?
- A. A local Node-SID can be configured as an index.
- 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. All routers do NOT need to have the same SRGB range configured.
正解：C
解説：
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.
質問 # 27
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 LSPs between every pair of PE routers.
- C. Specifying whether the LSP paths will be computed locally or by an external path computation element (PCE).
- D. Configuring at least one router in the network to create and advertise the flex-algo definition.
正解：D
解説：
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.
質問 # 28
Which of the following statements about the Path Computation Element (PCE) is FALSE?
- A. A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re-optimizations.
- B. A stateful PCE can allow LSPs to reserve bandwidth.
- C. A stateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.
- D. The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-LS.
正解：B
解説：
Stateful PCE can monitor the existing LSPs and trigger necessary repairs and re-optimizations, but it does not have the capability to reserve bandwidth.
質問 # 29
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 BGP sessions using the BGP-LS address family with routers R3 and R4
- B. Establishing IGP adjacencies with routers R1 and R2
- C. Establishing an IGP adjacency with router R2
- D. Establishing a BGP session using the BGP-LS address family with router R3
正解：A
質問 # 30
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