Nokia 4A0-116 Exam Questions Instant Access

Question 1

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

AThe number of hops included in the end-to-end path is reduced.

BThe path calculation can be delegated to an external path computation element (PCE).

CThere is a larger list of traffic-engineering constraint types that can be imposed on the LSP path.

DThe routers in the calculated path can take advantage of ECMP to better distribute the traffic load.

Answer : A

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.

Question 2

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?

AEstablishing an IGP adjacency with router R2

BEstablishing IGP adjacencies with routers R1 and R2

CEstablishing a BGP session using the BGP-LS address family with router R3

DEstablishing BGP sessions using the BGP-LS address family with routers R3 and R4

Answer : D

Question 3

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?

AThe ability to create cross-area TE-constrained LSP paths

BThe ability to create LSP paths with bandwidth reservation

CThe ability to create LSPs with primary and secondary paths

DThe ability to ensure that some LSP paths are disjoint

Answer : B

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.

Question 4

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

ALabel stack size of the encapsulated data packets

BList of traffic-engineering constraint types available to choose from

CAbility to associate one primary and up to two secondary paths to the same LSP

DFlexibility of configuring each LSP with its own set of traffic-engineering constraints

Answer : D

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.

Question 5

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

AA local Node-SID can be configured directly as an MPLS label.

BA router advertises its local Node-SID as a local SRGB and an index only if it is configured as an index.

CAll routers do NOT need to have the same SRGB range configured.

DA local Node-SID can be configured as an index.

Answer : B

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.

Question 6

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?

Answer : A

Question 7

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?

AValue 1 - Traffic Engineering

BValue 4 - Router Info

CValue 7 - SRGB Range

DValue 8 - Extended Link Info

Answer : D

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.

Nokia Segment Routing 4A0-116 Exam Questions