Nokia 4A0-D01 Exam Practice Test Instant Access

Question 1

Which of the following statements about resilient ECMP load balancing is TRUE?

AThe hash value used to distribute traffic is calculated as a modulo function on specific fields of the packet header.

BHash buckets are used to ensure that flows egressing the same interface on one router use different egress interfaces on downstream routers.

CA different hash seed is used on downstream routers to ensure that flows are randomly distributed across all eligible router interfaces.

DWhen one of the next-hops fail, only flows currently egressing to that next-hop are impacted.

Answer : D

In resilient ECMP load balancing, when a next-hop fails, only the flows that were using that specific next-hop are affected and need to be redistributed, minimizing disruption to other flows.

Question 2

Which of the following is NOT one of the reasons why BGP is used as the routing protocol in the data center?

AIt is more efficient than link-state protocols like IS-IS and OSPF.

BBGP neighbors automatically discover each other.

CIt is a well understood and mature routing protocol.

DIt supports both IPv4 and IPv6.

Answer : A

BGP is not chosen because it is more efficient than link-state protocols; in fact, link-state protocols like IS-IS and OSPF generally provide faster convergence and more efficient route calculation. BGP is used in data centers mainly because it is mature, well understood, supports both IPv4 and IPv6, and offers flexible policy control.

Question 3

Based on the exhibit output, what CLI command can be used to display the contents of ''bgp-log'' in Nokia's SR Linux?

Ashow system logging buffer bgp-log

Bshow system logging file bgp-log

Cinfo system logging buffer bgp-log

Dinfo system logging file bgp-log

Answer : B

The 'bgp-log' is defined as a log file in the configuration, so the correct command to display its contents is show system logging file bgp-log.

Question 4

Which of the following statements about a MAC-VRF is FALSE?

AA MAC-VRF is a Layer 2 network instance.

BBridge table entries contain an exit interface for each destination address.

CPackets received in a MAC-VRF are forwarded based on destination IP address.

DMultiple devices can be connected to the same IP subnet using a MAC-VRF.

Answer : C

In a MAC-VRF, packets are forwarded based on Layer 2 information such as destination MAC addresses, not on destination IP addresses.

Question 5

Which of the following statements about the IRB subinterface configuration in Nokia SR Linux is FALSE?

AAn IP address is configured under the IRB's subinterface.

BAn IRB subinterface is configured in an IP-VRF network instance.

COne IRB subinterface is configured for each interface within a MAC-VRF network instance.

DOne IRB subinterface is configured in a MAC-VRF network instance.

Answer : C

In Nokia SR Linux, IRB subinterfaces are configured one per MAC-VRF network instance, not one for each interface within that instance. Multiple IRB subinterfaces per interface are not typical.

Question 6

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.

Question 7

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.

Nokia 4A0-D01 Nokia Data Center Fabric Fundamentals Exam Practice Test