Free Practice Questions for Nokia 4A0-D01 Exam

Question 1

Based on the exhibit output, which of the following is NOT the reason the user runs the ''baseline diff'' command?

AUser admin is not able to commit their changes.

BAnother user has committed changes.

CUser admin wants to check if there are differences between the current running config and their baseline datastore.

DUser admin notices that ''!'' appears in the CLI prompt.

Correct Answer: A. User admin is not able to commit their changes.

Explanation:

The 'baseline diff' command is used to compare the candidate configuration against the baseline datastore to see changes or conflicts, especially when multiple users are involved or to verify differences. It does not indicate that the user is unable to commit changes.

Question 2

Which of the following statements about IP-VRFs in Nokia's SR Linux is FALSE?

AAn IP-VRF is a Layer 3 network instance.

BPackets in an IP-VRF are forwarded based on the destination IP address.

CThe router maintains a distinct route table for each IP-VRF instance.

DMultiple servers can be connected to the same subnet in an IP-VRF.

Correct Answer: D. Multiple servers can be connected to the same subnet in an IP-VRF.

Explanation:

Multiple servers connected to the same subnet typically reside within the same Layer 2 domain or MAC-VRF. IP-VRFs operate at Layer 3 and segment routing and forwarding by separate routing tables, so multiple servers on the same subnet are not a function of IP-VRF.

Question 3

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.

Correct Answer: C. It uses the spanning tree protocol to avoid forwarding loops.

Explanation:

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 4

When autoboot flag is set in grub.cfg, which of the following is NOT performed as part of the Zero Touch Provisioning (ZTP) autoboot process?

AUses the DHCP server to provide the IP address and default gateway

BUses the Web or FTP server to provide the RPM packages and any necessary images

CDownloads and executes provisioning scripts

DUses Nokia's Fabric Services System to deploy the digital sandbox automatically

Correct Answer: D. Uses Nokia's Fabric Services System to deploy the digital sandbox automatically

Explanation:

The ZTP autoboot process does not automatically use Nokia's Fabric Services System to deploy the digital sandbox; it focuses on network boot, DHCP IP assignment, and downloading/executing provisioning scripts from web or FTP servers.

Question 5

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

ACheckpoint 0 is always the oldest checkpoint.

BThe current running configuration can be saved as a JSON-formatted checkpoint file.

CThe operator can revert to any existing checkpoint.

DThe operator can generate a new checkpoint when committing configuration changes.

Correct Answer: A. Checkpoint 0 is always the oldest checkpoint.

Explanation:

In Nokia SR Linux, checkpoint numbering is dynamic. The system assigns the lowest available number to the most recent checkpoint, not necessarily '0.' When the number of saved checkpoints exceeds the configured maximum, the oldest checkpoint is removed, and the remaining checkpoints are renumbered accordingly. Therefore, checkpoint '0' is not always the oldest checkpoint.

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

Correct Answer: B. Multiple static routes can use the same next-hop-group.

Explanation:

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