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4A0-D01 Certification – Valid Exam Dumps Questions Study Guide! (Updated 37 Questions)
Nokia 4A0-D01 Exam Syllabus Topics:
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NEW QUESTION # 13
Which of the following is NOT one of the characteristics of Nokia's SR Linux?
- A. It uses mature and stable SNMP protocol to access the command line interface.
- B. It uses an unmodified Linux kernel that simplifies the use of third party applications.
- C. It uses a modular, state-driven architecture that gives applications efficient access to system information.
- D. It includes a NetOgs development kit that supports the integration of third-party applications.
Answer: A
Explanation:
Nokia's SR Linux does not rely on the SNMP protocol for accessing the command line interface; instead, it uses modern, programmable interfaces aligned with its modular architecture.
NEW QUESTION # 14
Which of the following is NOT how prefixes are typically learned and advertised in a leaf and spine data center?
- A. Each leaf router learns the prefixes of remote servers from other leaf routers directly using eBGP.
- B. Spine routers advertise learned prefixes to leaf routers directly using eBGP.
- C. Each leaf router advertises the prefixes of its own locally connected servers.
- D. Spine routers learn prefixes from leaf routers directly using eBGP.
Answer: A
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 # 15
How are LLDP frames advertised between two Nokia SR Linux routers?
- A. They are forwarded to the destination node based on the MAC VRF table.
- B. They are periodically flooded to the broadcast MAC address on each interface.
- C. They are routed to the destination node based on the IP VRF forwarding table.
- D. They are forwarded to the destination node based on the MAC VRF table.
Answer: D
Explanation:
LLDP frames are periodically sent to a well-known multicast MAC address on each interface to discover directly connected devices.
NEW QUESTION # 16
Which of the following statements about the YANG model used in Nokia's SR Linux is FALSE?
- A. The YANG model can be converted into other formats such as JSON or XML.
- B. The YANG model uses a tree structure with "leafs" as the branches and "containers" as the data components.
- C. All configuration and state information is defined as a YANG model.
- 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 # 17
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. It provides a consistent path for east-west traffic.
- C. It uses the spanning tree protocol to avoid forwarding loops.
- D. Each leaf router is connected to all the spine routers in the cluster.
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 # 18
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. Next-hop group
- C. Preference value
- D. blackhole
Answer: D
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 # 19
Which of the following is NOT one of the user types supported in Nokia SR Linux?
- A. Regular Linux OS users
- B. Container users
- C. SR Linux users
- D. Remote users
Answer: D
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 # 20
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. One IRB subinterface is configured for each interface within a MAC-VRF network instance.
- C. One IRB subinterface is configured in a MAC-VRF network instance.
- D. An IP address is configured under the IRB's subinterface.
Answer: B
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 # 21
Which of the following statements about using BFD with BGP is FALSE?
- A. BGP is notified if several BFD control packets are missed.
- B. The BFD endpoints agree on the send/receive rate of control packets.
- C. It can help rapidly detect link failures.
- D. Using BFD can speed up the BGP advertisement interval.
Answer: D
Explanation:
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.
NEW QUESTION # 22
Which of the following statements about SR Linux interfaces is FALSE?
- A. Layer 2 parameters such as MTU are configured at the SR Linux interface level while Layer 3 parameters are configured at the subinterface level.
- 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. Only one management interface is allowed.
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 # 23
Which of the following is NOT a function of Nokia's SR Linux application manager?
- A. It monitors the health of all applications.
- B. It translates the application's YANG model into protobufs for the IDB.
- C. It manages the SR Linux and customer-defined applications.
- D. It reads the application's configuration information and starts each application.
Answer: B
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 # 24
How does Nokia's Fabric Services System use a fabric intent to build the DC switch fabric?
- A. It uses a digital sandbox to connect workloads to the DC fabric.
- B. It uses telemetry data to build the configuration files for the DC fabric.
- C. It uses a digital sandbox to build the configuration files for the DC fabric.
- D. It uses a YAML file that defines the intended configuration state of the DC fabric.
Answer: D
Explanation:
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.
NEW QUESTION # 25
Which of the following statements about a CPM-filter policer is FALSE?
- A. The system-cpu-policer is hardware-based.
- B. The system-cpu-policer acts on the aggregate traffic from all line cards.
- C. Hierarchical policing of control plane traffic is supported.
- D. CPM-filter entries can use both a distributed-policer and a system-cpu-policer.
Answer: A
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 # 26
Which of the following statements about next-hop groups is TRUE?
- A. The next-hop for a next-hop-group must be a local IP address.
- B. A next-hop-group can only specify one next-hop for forwarding
- C. CMP destination unreachable message is always sent when blackhole is specified in the next-hop-group.
- D. Multiple static routes can use the same next-hop-group.
Answer: D
Explanation:
Multiple static routes can share the same next-hop group, enabling efficient reuse of next-hop definitions for load balancing or redundancy.
NEW QUESTION # 27
Which of the following statements about multi-homing in EVPN is FALSE?
- A. The Ethernet Segment (ES) identifies a set of links that connects a host to one or more leafs.
- B. The ES identifier (ESI) uniquely identifies an ES and it is locally significant for a particular leaf.
- C. Type 1 Ethernet Auto-Discovery (A-D) EVPN route is used to support EVPN multi-homing.
- D. Type 4 Ethernet Segment (ES) EVPN route is used for designated forwarder (DF) election for an ES.
Answer: B
Explanation:
The Ethernet Segment Identifier (ESI) uniquely identifies an Ethernet Segment (ES) globally across the EVPN domain, not just locally for a particular leaf.
NEW QUESTION # 28
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