4A0-D01 Questions PDF [2025] Use Valid New dump to Clear Exam
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Nokia 4A0-D01 Exam Syllabus Topics:
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NEW QUESTION # 22
Which of the following is NOT one of the reasons why BGP is used as the routing protocol in the data center?
- A. BGP neighbors automatically discover each other.
- B. It is more efficient than link-state protocols like IS-IS and OSPF.
- C. It is a well understood and mature routing protocol.
- D. It supports both IPv4 and IPv6.
Answer: B
Explanation:
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.
NEW QUESTION # 23
Which of the following statements about resilient ECMP load balancing is TRUE?
- A. Hash buckets are used to ensure that flows egressing the same interface on one router use different egress interfaces on downstream routers.
- B. When one of the next-hops fail, only flows currently egressing to that next-hop are impacted.
- C. The hash value used to distribute traffic is calculated as a modulo function on specific fields of the packet header.
- D. A different hash seed is used on downstream routers to ensure that flows are randomly distributed across all eligible router interfaces.
Answer: B
Explanation:
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.
NEW QUESTION # 24
Which of the following statements about the CLI modes in Nokia's SR Linux is FALSE?
- A. The state mode displays the current configuration and operational information.
- B. The show mode uses pre-defined reports to display operational information.
- C. Users can switch from one mode to another using the enter command.
- D. The running mode is used to make configuration changes.
Answer: C
Explanation:
In Nokia SR Linux, users switch between CLI modes using specific commands like configure or exit, not an enter command. The enter command is not used for mode switching.
NEW QUESTION # 25
Which of the following statements about SR Linux interfaces is FALSE?
- A. Only one management interface is allowed.
- B. Network interfaces are associated with physical ports on the linecards.
- C. The loopback interface is a physical interface directly connected to another interface on the same chassis.
- D. Layer 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
Explanation:
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.
NEW QUESTION # 26
Which of the following is NOT part of Day 2+ operations with Nokia's Fabric Services System?
- A. Monitor the data center fabric using model-driven telemetry.
- B. Use the digital sandbox to test and validate configuration changes and upgrades.
- C. Analyze the overall health of the data center fabric for proactive operations.
- D. Use a fabric intent to build and validate design templates.
Answer: D
Explanation:
Using a fabric intent to build and validate design templates is primarily a Day 0 or Day 1 activity focused on initial fabric deployment and design, not part of Day 2+ operational tasks like monitoring, health analysis, or change validation.
NEW QUESTION # 27
Which of the following statements about IP-VRFs in Nokia's SR Linux is FALSE?
- A. Packets in an IP-VRF are forwarded based on the destination IP address.
- B. Multiple servers can be connected to the same subnet in an IP-VRF.
- C. The router maintains a distinct route table for each IP-VRF instance.
- D. An IP-VRF is a Layer 3 network instance.
Answer: B
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.
NEW QUESTION # 28
Which of the following statements about the MAC table shown in the exhibit output is FALSE?
- A. [interface ethernet-1/10 is configured with the MAC address 00:25:BA:00:00:10.
- B. The MAC re-learning rate has exceeded the threshold within the specified time frame.
- C. The MAC address 00:25: BA:00:00:10 is learnt on more than one interface.
- D. Mac-duplication detection is enabled in mac-vrf-1.
Answer: C
Explanation:
The MAC address 00:25:BA:00:00:10 is listed as "duplicate," but it appears only once associated with interface ethernet-1/10. Therefore, it is not learned on more than one interface.
NEW QUESTION # 29
Which of the following statements about Zero Touch Provisioning (ZTP) is FALSE?
- A. The ZTP process is managed by the ZTP application in Nokia SR Linux.
- B. ZTP allows a router to become operational in the network without any pre-provisioning.
- C. The ZTP process downloads a provisioning script defined in the TLS profile.
- D. The ZTP process relies on a DHCP server for an IP address.
Answer: C
Explanation:
The ZTP process downloads a provisioning script typically from a defined URL or server, not from a TLS profile. The TLS profile is used for securing communications but does not define the provisioning script location.
NEW QUESTION # 30
Which of the following statements about a CPM-filter policer is FALSE?
- A. The system-cpu-policer acts on the aggregate traffic from all line cards.
- B. CPM-filter entries can use both a distributed-policer and a system-cpu-policer.
- C. Hierarchical policing of control plane traffic is supported.
- D. The system-cpu-policer is hardware-based.
Answer: D
Explanation:
The system-cpu-policer in Nokia SR Linux is software-based, not hardware-based. It acts on aggregate control plane traffic and supports hierarchical policing with CPM-filter entries using both distributed and system-cpu-policers.
NEW QUESTION # 31
Based on the exhibit output, which of the following is NOT the reason the user runs the "baseline diff" command?
- A. Another user has committed changes.
- B. User admin notices that "!" appears in the CLI prompt.
- C. User admin is not able to commit their changes.
- D. User admin wants to check if there are differences between the current running config and their baseline datastore.
Answer: C
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.
NEW QUESTION # 32
Which of the following statements about Nokia's SR Linux logging is FALSE?
- A. Logging parameter configuration is translated into the /etc/rsyslog.conf file.
- B. SR Linux supports the use of filters to select log messages.
- C. SR Linux logs can be saved locally as an encrypted file.
- D. SR Linux logs are handled using facility Iocal6 of the native Linux syslog utility.
Answer: C
Explanation:
Nokia SR Linux does not natively support saving logs locally as encrypted files. Logs are managed using standard Linux syslog facilities and can be filtered, but encryption of local log files is not a built-in feature.
NEW QUESTION # 33
Which of the following statements about a MAC-VRF is FALSE?
- A. Packets received in a MAC-VRF are forwarded based on destination IP address.
- B. A MAC-VRF is a Layer 2 network instance.
- C. Bridge table entries contain an exit interface for each destination address.
- D. Multiple devices can be connected to the same IP subnet using a MAC-VRF.
Answer: A
Explanation:
In a MAC-VRF, packets are forwarded based on Layer 2 information such as destination MAC addresses, not on destination IP addresses.
NEW QUESTION # 34
Which of the following statements about the IRB subinterface configuration in Nokia SR Linux is FALSE?
- A. An IRB subinterface is configured in an IP-VRF network instance.
- B. An IP address is configured under the IRB's subinterface.
- C. One IRB subinterface is configured in a MAC-VRF network instance.
- D. One IRB subinterface is configured for each interface within a MAC-VRF network instance.
Answer: D
Explanation:
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.
NEW QUESTION # 35
Which of the following is NOT a function of Nokia's SR Linux application manager?
- A. It translates the application's YANG model into protobufs for the IDB.
- B. It manages the SR Linux and customer-defined applications.
- C. It monitors the health of all applications.
- D. It reads the application's configuration information and starts each application.
Answer: A
Explanation:
The SR Linux application manager does not perform the function of translating an application's YANG model into protobufs for the Interface DataBase (IDB). Its primary roles are managing applications, reading their configuration, and monitoring their health.
NEW QUESTION # 36
Which of the following is NOT how prefixes are typically learned and advertised in a leaf and spine data center?
- A. Spine routers advertise learned prefixes to leaf routers directly using eBGP.
- B. Each leaf router advertises the prefixes of its own locally connected servers.
- C. Each leaf router learns the prefixes of remote servers from other leaf routers directly using eBGP.
- D. Spine routers learn prefixes from leaf routers directly using eBGP.
Answer: C
Explanation:
Leaf routers do not learn prefixes from other leaf routers directly using eBGP; instead, leaf routers learn remote prefixes via spine routers. The spine acts as the route reflector or intermediary between leaf routers.
NEW QUESTION # 37
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