無料更新されたNokia 4A0-116テストエンジン問題には42問あります
ベストな問題集を使おうNokia Service Routing Architect 4A0-116専門試験問題
質問 # 13
OSPF type-10 Opaque LSAs can carry different types of advertisements. What type of advertisement carries a router's local 5RGB information?
- A. Extended Link Info
- B. Extended Prefix Info
- C. Traffic Engineering Info
- D. Router Info
正解：D
解説：
This type of advertisement carries a router's local SRGB information, which is used to distribute information about the local SID allocation range
質問 # 14
Which of the following statements about the Path Computation Element (PCE) is FALSE?
- A. A stateful PCE can allow LSPs to reserve bandwidth.
- B. A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re-optimizations.
- 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：A
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 # 15
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 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.
- B. It selects an immediate neighbor.
- C. It selects a remote router, reachable through a tunnel defined by a Node-SID and one or two Adjacency-SIDs.
- D. It selects a remote router, reachable through a tunnel defined by a single Node-SID.
正解：A
解説：
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.
質問 # 16
In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?
- A. List of traffic-engineering constraint types available to choose from
- B. Label stack size of the encapsulated data packets
- C. Flexibility of configuring each LSP with its own set of traffic-engineering constraints
- D. Ability to associate one primary and up to two secondary paths to the same LSP
正解：C
解説：
Flex-Algo LSPs are a type of LSP that allows for greater flexibility in configuring traffic engineering constraints. This is because flex-algo LSPs can be configured with a unique set of traffic engineering constraints for each LSP, whereas SR-TE LSPs use a predefined set of traffic engineering constraints that applies to all LSPs.
Label stack size of the encapsulated data packets, List of traffic-engineering constraint types available to choose from, and Ability to associate one primary and up to two secondary paths to the same LSP are not the advantages of flex-algo LSPs over SR-TE LSPs.
質問 # 17
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. Standard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.
- C. Only standard LFA is 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：B
質問 # 18
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 only be advertised using application-specific sub-TLVs.
- B. The TE information will only be advertised for the OSPF links that have both MPLS and RSVP enabled.
- C. The TE information will be advertised for all the OSPF links that have MPLS enabled.
- 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 # 19
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 4 - Router Info
- B. Value 7 - SRGB Range
- C. Value 1 - Traffic Engineering
- D. Value 8 - Extended Link Info
正解：D
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 # 20
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. No segments, unless segment-routing fast-reroute is also explicitly enabled.
- B. Only segments defined by an Adjacency-SID.
- C. Only segments defined by a Node-SID.
- D. Segments defined by a Node-SID and segments defined by an Adjacency-SID.
正解：D
解説：
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.
質問 # 21
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 a BGP session using the BGP-LS address family with router R3
- 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 # 22
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, R2, R4, R6
- C. R1, R5, R6
- D. R1, R6
正解：A
質問 # 23
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
正解：D
質問 # 24
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 router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.
- C. All routers do NOT need to have the same SRGB range configured.
- D. A local Node-SID can be configured directly as an MPLS label.
正解：B
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 # 25
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. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
- C. A Node-SID is usually associated with a router's system interface.
- D. An Adjacency-SID does not have to be configured.
正解：D
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 # 26
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 R4, which is the tail-end of the active segment.
- B. To reach router R5, which is the shortest way to go back to the original path.
- 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.
正解：B
質問 # 27
Which of the following is not required to be advertised by a router participating in Segment Routing?
- A. Local Node-SID
- B. Adjacency-SIDs
- C. SRGB when SRv6 is configured
- D. Support for SR-MPLS for IPv4 or IPv6, or SRv6
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 # 28
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 path calculation can be delegated to an external path computation element (PCE).
- C. The number of hops included in the end-to-end path is reduced.
- D. The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
正解：C
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 # 29
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