Nokia 4A0-D01 Exam Questions Instant Access

Question 1

Which of the following statements about SR Linux interfaces is FALSE?

AOnly one management interface is allowed.

BNetwork interfaces are associated with physical ports on the linecards.

CThe loopback interface is a physical interface directly connected to another interface on the same chassis.

DLayer 2 parameters such as MTU are configured at the SR Linux interface level while Layer 3 parameters are configured at the subinterface level.

Answer : C

The loopback interface in SR Linux is a logical, virtual interface used for management and routing purposes; it is not a physical interface directly connected to another interface on the same chassis.

Question 2

Which of the following statements about the data center's leaf-spine topology (clos network) is FALSE?

AEach leaf router is connected to all the spine routers in the cluster.

BIt provides a consistent path for east-west traffic.

CIt uses the spanning tree protocol to avoid forwarding loops.

DIt uses ECMP to distribute traffic across duplicate links.

Answer : C

The leaf-spine (Clos) topology does not use the spanning tree protocol because it relies on equal-cost multipath (ECMP) routing to prevent loops and efficiently utilize all available paths. Spanning tree is typically avoided in modern data center fabrics to enable full bandwidth utilization.

Question 3

Which of the following statements about using BFD with BGP is FALSE?

AIt can help rapidly detect link failures.

BThe BFD endpoints agree on the send/receive rate of control packets.

CBGP is notified if several BFD control packets are missed.

DUsing BFD can speed up the BGP advertisement interval.

Answer : D

BFD helps detect link failures rapidly and notifies BGP to trigger route updates quickly, but it does not speed up the BGP advertisement interval itself. BGP advertisement intervals are controlled by BGP timers, not by BFD.

Question 4

A static route is configured in two steps in Nokia's SR Linux. Which of the following items CANNOT be configured in the static-routes container?

Ablackhole

BIPv4 destination prefix

CPreference value

DNext-hop group

Answer : A

The static-routes container in Nokia SR Linux does not support configuring a blackhole route directly; it is used to configure destination prefixes, preference values, and next-hop groups for static routing.

Question 5

Which of the following statements about the YANG model used in Nokia's SR Linux is FALSE?

AAll configuration and state information is defined as a YANG model.

BThe YANG model uses a tree structure with ''leafs'' as the branches and ''containers'' as the data components.

CThe YANG model can be converted into other formats such as JSON or XML.

DThe YANG model provides a standardized way for applications to retrieve SR Linux configuration and state information.

Answer : B

In YANG models, 'leafs' are the data nodes (not branches), and 'containers' group related data nodes. The statement incorrectly reverses their roles by calling leafs branches and containers data components.

Question 6

Which of the following statements about next-hop groups is TRUE?

AThe next-hop for a next-hop-group must be a local IP address.

BMultiple static routes can use the same next-hop-group.

CCMP destination unreachable message is always sent when blackhole is specified in the next-hop-group.

DA next-hop-group can only specify one next-hop for forwarding

Answer : B

Multiple static routes can share the same next-hop group, enabling efficient reuse of next-hop definitions for load balancing or redundancy.

Question 7

How does Nokia's Fabric Services System use a fabric intent to build the DC switch fabric?

AIt uses a YAML file that defines the intended configuration state of the DC fabric.

BIt uses a digital sandbox to connect workloads to the DC fabric.

CIt uses a digital sandbox to build the configuration files for the DC fabric.

DIt uses telemetry data to build the configuration files for the DC fabric.

Answer : A

Nokia's Fabric Services System uses a fabric intent defined in a declarative YAML file to specify the desired state of the data center fabric, which is then used to build and configure the fabric accordingly.

Nokia Data Center Fabric Fundamentals 4A0-D01 Exam Questions