Free Nokia Segment Routing Exam 4A0-116 Exam Practice Test

In which of the following aspects does the configuration of flex-algo LSPs have an advantage over the configuration of SR-TE LSPs?

• Label stack size of the encapsulated data packets
• List of traffic-engineering constraint types available to choose from
• Ability to associate one primary and up to two secondary paths to the same LSP
• Flexibility of configuring each LSP with its own set of traffic-engineering constraints

Which of the following statements about enabling and using traffic engineering for Segment Routing is FALSE?

• One interface can belong to an admin group and SRLG group at the same time.
• A link attribute has to be assigned to a particular interface under the [/configure router interface] context
• Bandwidth availability as a link attribute cannot be configured.
• The interfaces used for SR-TE LSPs have to be added to the MPLS context.

In the context of a network that includes a Path Computation Element (PCE), what is a PCC-initiated LSP?

• An LSP that needs to be explicitly configured on the head-end router.
• An LSP for which the initial path is calculated by the head-end router.
• An LSP for which the path repairs and re-optimizations must be triggered by the head-end router.
• An LSP whose existence and state are reported to the PCE.

Which of the following statements about Segment Routing tunnels is FALSE?

• A Segment Routing tunnel defined by a Node-SID uses the shortest IGP Path.
• A Segment Routing tunnel can be defined by multiple Node-SIDs.
• A Segment Routing tunnel can be defined by a combination of Node-SIDs and Adjacency-SIDs.
• For a Segment Routing tunnel, an intermediate router will always forward the packet based on the best IGP path.

Which of the following statements about a Segment Routing SID is FALSE?

• A Node-SID is usually associated with a router's system interface.
• Adjacency-SID values are taken from the SRGB configured for the routing protocol.
• A Prefix-SID can be configured directly as a label value or indirectly as an index.
• An Adjacency-SID does not have to be configured.

Which of the following statements about the Path Computation Element (PCE) is FALSE?

• The PCE can obtain topology and traffic-engineering information from the network using either a link-state IGP or BGP-LS.
• A stateful PCE proactively monitors all the existing LSPs and triggers the necessary repairs and re- optimizations.
• A stateless PCE can calculate cross-area traffic-engineering-constrained LSP paths.
• A stateful PCE can allow LSPs to reserve bandwidth.

Which of the following statements about segment routing fast re-route is FALSE?

• Fast re-route is a temporary fix that becomes active for a short period of time after a local network failure.
• 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.
• On a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.
• The parameter "max-sr-frr-labels" limits the number of labels that R-LFA can add to the data packet encapsulation.

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?

• Value 1 - Traffic Engineering
• Value 4 - Router Info
• Value 7 - SRGB Range
• Value 8 - Extended Link Info

Which of the following is an advantage of enabling label stack reduction for a CSPF-calculated path, as compared to using plain CSPF?

• The number of hops included in the end-to-end path is reduced.
• The path calculation can be delegated to an external path computation element (PCE).
• There is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.
• The routers in the calculated path can take advantage of ECMP to better distribute the traffic load.

Which of the following statements about Segment Routing is FALSE?

• No path signaling is required to establish an SR tunnel.
• Intermediate routers do not maintain any tunnel informal
• A link-state IGP is required to distribute SID information.
• For TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.