Nokia 4A0-116 Exam Practice Test Instant Access

Question 1

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 2

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

AFast re-route is a temporary fix that becomes active for a short period of time after a local network failure.

BFast 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.

COn a Nokia 7750 SR, R-LFA and TI-LFA can be enabled independently of each other.

DThe parameter 'max-sr-frr-labels' limits the number of labels that R-LFA can add to the data packet encapsulation.

Answer : C

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.

Question 3

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 4

Which of the following is not required to be advertised by a router participating in Segment Routing?

ALocal Node-SID

BAdjacency-SIDs

CSupport for SR-MPLS for IPv4 or IPv6, or SRv6

DSRGB when SRv6 is configured

Answer : D

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.

Question 5

Which of the following statements about Segment Routing is FALSE?

ANo path signaling is required to establish an SR tunnel.

BIntermediate routers do not maintain any tunnel informal

CA link-state IGP is required to distribute SID information.

DFor TE-constrained tunnels, each data packet typically carries a single MPLS label to specify the tunnel path.

Answer : B

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.

Question 6

Based on the exhibit, which of the following statements about fast re-route for flex-algo instance 129 is TRUE?

AOnly standard LFA is enabled on router R1; fast re-route is not enabled on router R2.

BOnly standard LFA is enabled on both routers R1 and R2.

CStandard LFA and remote-LFA are enabled on router R1; fast re-route is not enabled on router R2.

DStandard LFA and remote-LFA are enabled on router R1; standard LFA and TT-LFA are enabled on router R2.

Answer : C

Question 7

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?

ATo reach router R2, which is the LSP's intended next-hop.

BTo reach router R5, which is the shortest way to go back to the original path.

CTo reach router R4, which is the tail-end of the active segment.

DTo reach router R8, which is the tail-end of the LSP.

Answer : B

Nokia 4A0-116 Nokia Segment Routing Exam Practice Test