Nokia 4A0-D01 Certification All-in-One Exam Guide Jun-2026
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NEW QUESTION # 20
Which of the following statements about a MAC-VRF is FALSE?
- A. A MAC-VRF is a Layer 2 network instance.
- B. Multiple devices can be connected to the same IP subnet using a MAC-VRF.
- C. Packets received in a MAC-VRF are forwarded based on destination IP address.
- D. Bridge table entries contain an exit interface for each destination address.
Answer: C
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 # 21
Which of the following is NOT a valid logging source used in Nokia's SR Linux?
- A. SR Linux subsystem + priority
- B. Linux facility + priority
- C. Console
- D. Syslog filter
Answer: D
Explanation:
"Syslog filter" is not a logging source; it is a mechanism used to filter log messages. Valid logging sources in SR Linux include Linux facility + priority, console, and SR Linux subsystem + priority.
NEW QUESTION # 22
Which of the following is NOT one of the user types supported in Nokia SR Linux?
- A. Remote users
- B. SR Linux users
- C. Container users
- D. Regular Linux OS users
Answer: A
Explanation:
Nokia SR Linux supports SR Linux users, regular Linux OS users, and container users. "Remote users" is not a defined user type within SR Linux user management.
NEW QUESTION # 23
Examine the exhibit. What type of information is NOT included in the IMET route advertised by VTEP1?
- A. Route distinguisher of VTEP1's MAC-VRF
- B. Flooding list
- C. IP address of VTEP1
- D. VXLAN network identifier (VNI)
Answer: A
Explanation:
The IMET route includes the VNI, flooding list, and IP address of the originating VTEP, but it does not include the route distinguisher of the VTEP's MAC-VRF.
NEW QUESTION # 24
Which of the following statements about the YANG model used in Nokia's SR Linux is FALSE?
- A. All configuration and state information is defined as a YANG model.
- B. The YANG model uses a tree structure with "leafs" as the branches and "containers" as the data components.
- C. The YANG model can be converted into other formats such as JSON or XML.
- D. The YANG model provides a standardized way for applications to retrieve SR Linux configuration and state information.
Answer: B
Explanation:
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.
NEW QUESTION # 25
Which of the following statements about the VXLAN tunneling in data centers is FALSE?
- A. VXLAN tunnel endpoints can be on hypervisors, leaf routers, or datacenter gateways.
- B. VLXAN tunneling is used to provide Layer 2 connectivity between workloads over a common underlay network.
- C. Each VXLAN tunnel endpoint is automatically assigned with a unique VNI value.
- D. EVPN routes are exchanged between VXLAN tunnel endpoints.
Answer: C
Explanation:
VXLAN tunnel endpoints (VTEPs) are configured with VNI (VXLAN Network Identifier) values, but these VNIs are not automatically assigned; they must be explicitly configured to define Layer 2 segments.
NEW QUESTION # 26
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?
- A. IPv4 destination prefix
- B. Preference value
- C. blackhole
- D. Next-hop group
Answer: C
Explanation:
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.
NEW QUESTION # 27
Which of the following statements about Nokia's Fabric Services System is FALSE?
- A. Cloud-native design enables easy integration with the customer's environment.
- B. Data center fabric configuration is represented as the fabric intent in a declarative YAML format.
- C. Telemetry data is provided in a context that is relevant to the fabric intent.
- D. Digital sandbox provides notification of performance issues in the data center fabric.
Answer: D
Explanation:
The Digital Sandbox in Nokia's Fabric Services System is primarily used for simulation and validation of fabric intent, not for providing notifications of performance issues.
NEW QUESTION # 28
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 learns the prefixes of remote servers from other leaf routers directly using eBGP.
- C. Spine routers learn prefixes from leaf routers directly using eBGP.
- D. Each leaf router advertises the prefixes of its own locally connected servers.
Answer: B
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 # 29
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 a fabric intent to build and validate design templates.
- C. Use the digital sandbox to test and validate configuration changes and upgrades.
- D. Analyze the overall health of the data center fabric for proactive operations.
Answer: B
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 # 30
Which of the following statements about the data center's leaf-spine topology (clos network) is FALSE?
- A. It uses ECMP to distribute traffic across duplicate links.
- B. Each leaf router is connected to all the spine routers in the cluster.
- C. It uses the spanning tree protocol to avoid forwarding loops.
- D. It provides a consistent path for east-west traffic.
Answer: C
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.
NEW QUESTION # 31
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. The router maintains a distinct route table for each IP-VRF instance.
- C. An IP-VRF is a Layer 3 network instance.
- D. Multiple servers can be connected to the same subnet in an IP-VRF.
Answer: D
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 # 32
Based on the exhibit output, which of the following statements is TRUE?
- A. An ACL filter is configured to accept ICMP packets, which are then processed by the tcpdump-like utility.
- B. A cpm-filter policer is configured to rate limit ICMP packets, which are then captured in a log file.
- C. A cpm-filter is configured to accept ICMP packets, which are then captured in a log file.
- D. capture-filter is configured to copy ICMP packets to the CPM where they are processed by the tcpdump-like utility.
Answer: D
Explanation:
The exhibit shows ICMP packets being captured and displayed by a tcpdump-like utility, which indicates that a capture-filter is configured to copy ICMP packets to the Control Plane Manager (CPM) where they are processed and monitored.
NEW QUESTION # 33
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 # 34
Which of the following statements about SR Linux interfaces is FALSE?
- A. Only one management interface is allowed.
- B. The loopback interface is a physical interface directly connected to another interface on the same chassis.
- C. Network interfaces are associated with physical ports on the linecards.
- 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: B
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 # 35
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