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NEW QUESTION # 11
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. No segments, unless segment-routing fast-reroute is also explicitly enabled.
- C. Only segments defined by an Adjacency-SID.
- D. Only segments defined by a Node-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 # 12
Which of the following types of information is considered by a stateless PCE when it processes a new LSP path calculation request?
- A. The traffic-engineering database
- B. The operational state of existing LSP paths
- C. The amount of bandwidth reserved for each of the existing LSP paths
- D. The IGP link-state database
Answer: D
NEW QUESTION # 13
Which of the following statements about segment routing fast re-route is FALSE?
- A. On a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.
- 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. The parameter "max-sr-frr-labels" limits the number of labels that R-LFA can add to the data packet encapsulation.
Answer: A
Explanation:
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.
NEW QUESTION # 14
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. MPLS label range reserved for Segment Routing.
- C. The flooding scope of Segment Routing information.
- D. The Segment Routing Global Block range.
Answer: A
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 # 15
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. Once a path is associated with an LSP, it cannot be used by other LSPs.
- D. The path hops can be defined by either the system or physical interface IP address.
Answer: D
NEW QUESTION # 16
Which of the following statements about a Segment Routing SID is FALSE?
- A. A local Node-SID can be configured as an index.
- B. All routers do NOT need to have the same SRGB range configured.
- C. A router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.
- D. A local Node-SID can be configured directly as an MPLS label.
Answer: C
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 # 17
Which of the following statements about Segment Routing is FALSE?
- A. Intermediate routers do not maintain any tunnel informal
- B. No path signaling is required to establish an SR tunnel.
- C. A link-state IGP is required to distribute SID information.
- D. For TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.
Answer: A
Explanation:
Intermediate routers do not maintain any tunnel informal: this statement is false, Intermediate routers do maintain tunnel information, such as the Forwarding Information Base (FIB) to forward the packets according to the path specified in the packets.
NEW QUESTION # 18
Which of the following statements about Segment Routing tunnels is FALSE?
- A. For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.
- 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. A Segment Routing tunnel can be defined by multiple Node-SIDs.
Answer: A
Explanation:
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.
NEW QUESTION # 19
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. One interface can belong to an admin group and SRLG group at the same time.
- C. The interfaces used for SR-TE LSPs have to be added to the MPLS context.
- 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 # 20
Which of the following is NOT a valid option to steer traffic into a flex-algo segment-routing tunnel?
- A. 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.
- B. 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.
- C. 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.
- 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: C
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 # 21
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 routers in the calculated path can take advantage of ECMP to better distribute the traffic load.
- C. The path calculation can be delegated to an external path computation element (PCE).
- D. The number of hops included in the end-to-end path is reduced.
Answer: D
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 # 22
Based upon the exhibit, which of the following statements regarding the configuration is FALSE?
- A. Adjacency-SID labels will not be advertised as they have not been defined under the physical interfaces.
- B. Traffic engineering has been enabled on this router.
- C. Traffic engineering information will only be advertised for the interfaces that have both MPLS and RSVP enabled.
- D. The Node-SID assigned to this router is the second label in the defined range.
Answer: C
NEW QUESTION # 23
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 create LSP paths with bandwidth reservation
- B. The ability to ensure that some LSP paths are disjoint
- C. The ability to create LSPs with primary and secondary paths
- D. The ability to create cross-area TE-constrained LSP paths
Answer: A
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 # 24
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. Defining traffic paths based on various constraints.
- C. Avoiding potential congestion points in the network.
- D. Utilizing redundant links.
Answer: A
NEW QUESTION # 25
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. Router RIO participates in flex-algo instance 130.
- B. The underlying routing protocol being used in the network for segment routing is IS-IS.
- C. The Node-SID assigned to router RIO for flex-algo instance 129 is 524338.
- D. Router Rl participates in at least two flex-algo instances.
Answer: C
NEW QUESTION # 26
Which of the following statements about SR-TE administrative constraints is FALSE?
- A. Shared-Risk-Link Groups are only taken into account when calculating the secondary path.
- B. The head-end router may calculate a path that takes into account max hop count and bandwidth constraints.
- C. A strict hop must be adjacent to the previous hop in the list.
- D. The TE metric for a link is by default the same as the IGP metric.
Answer: A
Explanation:
Shared-Risk-Link Groups(SRLG) is taken into account when calculating both primary and secondary path to avoid routing over the same physical link.
NEW QUESTION # 27
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