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NEW QUESTION # 23
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 Node-SID assigned to router RIO for flex-algo instance 129 is 524338.
- B. Router Rl participates in at least two flex-algo instances.
- C. The underlying routing protocol being used in the network for segment routing is IS-IS.
- D. Router RIO participates in flex-algo instance 130.
Answer: A
NEW QUESTION # 24
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. An Adjacency-SID does not have to be configured.
- C. A Prefix-SID can be configured directly as a label value or indirectly as an index.
- D. Adjacency-SID values are taken from the SRGB configured for the routing protocol.
Answer: B
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 # 25
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 # 26
Which of the following statements about Multi-Protocol Label Switching networks is FALSE?
- A. An LSR forwards data based on the MPLS labels.
- B. The data is transparently carried from end to end.
- C. An LSP is a bi-directional tunnel that uses MPLS labels to forward data.
- D. MPLS uses a signaling protocol to exchange labels between routers.
Answer: B
Explanation:
The data is transparently carried from end to end: This statement is not true, MPLS does not provide data transparency, which means that the data is not carried unmodified from end to end. MPLS uses labels to forward data, so the original IP packets are encapsulated in new MPLS packets, and the original IP headers are not visible at the egress LSR.
NEW QUESTION # 27
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. Only one LSP path forwards the traffic at any time,
- C. Up to three paths can be configured for a given SR-TE LS
- D. Preference values can be configured for non-standby secondary paths.
Answer: C
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 # 28
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?
- A. 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.
- B. 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.
- C. 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.
- 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: B
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 # 29
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, bandwidth availability of each link, SRLG that each link belongs to.
- B. Administrative groups that each link belongs to, TE metric of links, SRLG that each link belongs to.
- C. Administrative groups that each link belongs to, TE metric of links, 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, link status up/down.
Answer: A
Explanation:
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.
NEW QUESTION # 30
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 traffic-engineering database
- C. The amount of bandwidth reserved for each of the existing LSP paths
- D. The IGP link-state database
Answer: D
NEW QUESTION # 31
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 an immediate neighbor.
- 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 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.
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 # 32
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 routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- B. The number of hops included in the end-to-end path is reduced.
- C. The path calculation can be delegated to an external path computation element (PCE).
- D. There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
Answer: B
Explanation:
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.
NEW QUESTION # 33
The exhibit shows the fast re-route configuration on router R1, in which both R-LFA and TI-LFA have been enabled. Assume that there are multiple potential backup paths for a given prefix. Which of the following options will router R1 use?
- A. A standard LFA path that would not coincide with the path after IGP re-convergence.
- B. A D-LFA path that would coincide with the path after IGP re-convergence.
- C. An R-LFA path that would not coincide with the path after IGP re-convergence.
- D. A D-LFA path that would not coincide with the path after IGP re-convergence.
Answer: B
Explanation:
The exhibit shows that both R-LFA and TI-LFA have been enabled on router R1. R-LFA (Remote Loop-Free Alternate) is a method that is used to protect the active segment of a tunnel, and it allows the router to find a backup path that coincides with the path that will become active after IGP reconvergence. TI-LFA (Topology Independent LFA) is a method that is used to protect an end-to-end multi-segment tunnel, it allows the router to find a backup path that does not rely on the IGP topology, but on the segment routing topology.
With R-LFA and TI-LFA enabled, router R1 will use a D-LFA (Dual-Loop-Free Alternate) path, which is a combination of both R-LFA and TI-LFA, this path will coincide with the path after IGP re-convergence.
A standard LFA, R-LFA, and D-LFA which do not coincide with the path after IGP re-convergence are not the options.
NEW QUESTION # 34
Which of the following statements about enabling and using traffic engineering for Segment Routing is FALSE?
- A. Bandwidth availability as a link attribute cannot be configured.
- B. The interfaces used for SR-TE LSPs have to be added to the MPLS context.
- C. One interface can belong to an admin group and SRLG group at the same time.
- D. A link attribute has to be assigned to a particular interface under the [/configure router interface] context
Answer: A
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 # 35
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 R8, which is the tail-end of the LSP.
- B. To reach router R5, which is the shortest way to go back to the original path.
- C. To reach router R4, which is the tail-end of the active segment.
- D. To reach router R2, which is the LSP's intended next-hop.
Answer: B
NEW QUESTION # 36
In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?
- A. Ability to associate one primary and up to two secondary paths to the same LSP
- B. List of traffic-engineering constraint types available to choose from
- C. Label stack size of the encapsulated data packets
- D. Flexibility of configuring each LSP with its own set of traffic-engineering constraints
Answer: D
Explanation:
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.
NEW QUESTION # 37
Examine the exhibit. Based upon the configuration, which routers will the LSP go through?
- A. R1, R2, R4 and R6
- B. R1, R3, R2, R5, R4 and R6
- C. R1, R2, R5 and R6
- D. R1, R3, R4 and R6
Answer: D
NEW QUESTION # 38
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 cross-area TE-constrained LSP paths
- C. The ability to create LSP paths with bandwidth reservation
- D. The ability to create LSPs with primary and secondary paths
Answer: C
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 # 39
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