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Nokia 4A0-D03 Exam Syllabus Topics:

Section Weight Objectives
Topic 1: SR Linux and EVPN Fundamentals 25% - VXLAN encapsulation and underlay
- SR Linux architecture and CLI
- EVPN control plane and MP-BGP
Topic 2: Layer 2 EVPN Services 25% - Anycast Gateway and IRB
- EVPN Route Types 1–4
- Multi-homing and Ethernet Segments
Topic 3: Data Center Interconnect (DCI) Solutions 25% - Gateway-less EVPN DCI
- Interoperability with Nokia 7750 SR
- BGP route policies and route reflectors
Topic 4: Layer 3 EVPN Services 25% - EVPN Route Type 5
- VRF integration and route targets
- Symmetric and asymmetric routing

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最新的 Nokia Certified Data Center Fabric Professional 4A0-D03 免費考試真題 (Q33-Q38):

問題 #33
Consider the exhibit.

Which of the following statements about the proxy ARP entry for the neighbor IP 192.168.100.1 is FALSE?

  • A. The state is pending because this MAC address was originally associated with a different IP address.
  • B. The MAC address will be changed to 00:00:00:00:DE:AD if the state changes to duplicate.
  • C. The traffic will be forwarded to a blackhole if the state changes to duplicate.
  • D. All traffic destined to 192.168.100.1 will be discarded for 9 minutes if the state changes to duplicate.

答案：D

解題說明：
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Proxy ARP in a Layer 2 EVPN service allows the leaf to answer ARP requests locally using learned IP/MAC bindings, reducing broadcast flooding across the overlay. SR Linux can also monitor IP duplication and MAC/IP inconsistencies in the proxy ARP table. A pending state indicates that the system has detected suspicious or conflicting information and is monitoring the binding before declaring it duplicate. If the entry becomes duplicate, SR Linux can use a blackhole behavior to prevent forwarding traffic toward a conflicted endpoint, and a special discard MAC such as 00:00:00:00:DE:AD can be associated with the duplicate entry. Option D is false because it incorrectly states that all traffic destined to 192.168.100.1 will be discarded for exactly 9 minutes. The exhibit references monitoring and hold-down behavior, but the answer key rejects the fixed "9 minutes" traffic-discard statement. The key concept is that duplicate handling protects the EVPN service from unstable or conflicting IP/MAC bindings, but the specific discard duration in option D is not correct. Reference: proxy ARP, IP duplication monitoring, duplicate-state blackhole behavior.


問題 #34
Consider the exhibit.

Which of the following statements is FALSE?

  • A. The remote host's IP address is 100.0.2.3.
  • B. The MAC address 00:00:00:00:00:01 was learned through the data plane.
  • C. The MAC address associated to the vxlan-interface will not age out.
  • D. The VXLAN network identifier configured for this MAC-VRF is 100.

答案：C

解題說明：
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In an SR Linux Layer 2 EVPN MAC-VRF, locally attached MAC addresses are learned through the data plane on local access interfaces, while remote MAC addresses are learned from MP-BGP EVPN control-plane advertisements and installed with a VXLAN next-hop. The exhibit shows one local learned MAC on an Ethernet subinterface and another MAC learned through EVPN with a VXLAN interface and VNI 100. The remote VTEP or next-hop information identifies the remote endpoint, and the VNI maps the received VXLAN traffic to the correct MAC-VRF service. The false statement is C because saying that the MAC address associated with the vxlan-interface "will not age out" is too absolute. A remote EVPN MAC is not aged in the same way as a local data-plane-learned MAC, but it can still be removed when the corresponding EVPN route is withdrawn, invalidated, or no longer present in the control plane. The "N/A" style aging behavior does not mean permanent retention. Reference: SR Linux MAC-VRF verification, local MAC learning, EVPN-learned remote MACs, VXLAN VNI mapping.


問題 #35
Which of the following statements about configuring and using an integrated routing and bridging (IRB) interface is TRUE?

  • A. When the IRB sub-interface is configured with multiple IP addresses, one of them can be configured as the primary.
  • B. When using an IRB interface to interconnect a MAC-VRF to an IP-VRF, one sub-interface is configured for the MAC-VRF and another one for the IP-VRF.
  • C. The IRB sub-interface must be configured as either type bridge or routed.
  • D. A MAC-VRF can be configured with multiple IRB sub-interfaces to support multi-homing.

答案：A

解題說明：
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
An IRB interface is the logical connection point between a Layer 2 MAC-VRF and a Layer 3 IP-VRF. It provides the routed gateway function for hosts in the bridge domain while allowing traffic to move into the routed VRF for inter-subnet forwarding. The correct statement is that when an IRB sub-interface has multiple IP addresses, one can be designated as the primary. This is important because the primary address is used for normal gateway or subnet behavior when more than one address is present on the same routed interface context. Option A is inaccurate because the question is about an IRB sub-interface, not a generic subinterface selection between bridge or routed access modes. Option B is not the defining multi-homing model; EVPN multi-homing is implemented through Ethernet Segment association and MAC-VRF attachment behavior, not by adding multiple IRB subinterfaces for multi-homing. Option D is also wrong because the IRB is the shared logical link between the MAC-VRF and IP-VRF; the design does not require separate IRB subinterfaces on each side as independent constructs. Reference: SR Linux IRB configuration, MAC-VRF to IP-VRF interconnection, primary IP addressing.


問題 #36
Leaf routers are configured to support Layer 2 multi-homing all-active mode.
Which of the following statements is FALSE?

  • A. The Ethernet segment must be administratively enabled.
  • B. All of the sub-interfaces of the LAG must be configured in the Ethernet segment.
  • C. The 2nd through 7th octets of the ESI must not be all zeros.
  • D. The multi-homing mode of all-active must be configured for the Ethernet segment.

答案：C

解題說明：
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
For Layer 2 all-active EVPN multi-homing on SR Linux, the Ethernet Segment configuration is the control-plane anchor that binds the redundant access attachment to EVPN. The relevant LAG subinterfaces must be associated with the Ethernet Segment so that the PE can advertise the segment correctly and apply split-horizon and aliasing behavior. The Ethernet Segment must also be administratively enabled; otherwise, the PE will not participate properly in ES discovery and DF procedures. The multi-homing mode must be set to all-active to permit forwarding through multiple attached leaf routers and support host-side LAG operation. The false statement is option B. The Ethernet Segment Identifier has a defined structure, and the blanket statement that the 2nd through 7th octets "must not be all zeros" is not a valid requirement as stated. What matters operationally is that the ESI uniquely identifies the same multi-homed Ethernet Segment across participating PEs and is consistently configured where required. The ESI must be non-zero as a meaningful segment identifier, but the specific octet restriction in the option is not the SR Linux all-active configuration rule. Reference: SR Linux L2 EVPN all-active multi-homing, Ethernet Segment configuration, LAG association.


問題 #37
Which of the following statements about the gateway-less data center interconnect solution is FALSE?

  • A. The route reflectors must be reachable between different data centers.
  • B. The data center border leaf and gateway can use either eBGP or static routes to exchange routing information.
  • C. It provides a clear demarcation for security between the border leaf and gateway.
  • D. All of the data centers leaf routers must be reachable over the WAN network.

答案：C

解題說明：
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A gateway-less DCI design extends the data center EVPN/VXLAN model across the WAN without a distinct gateway function separating the data center fabric from the WAN VPN edge. Because the leaf routers or route reflectors must establish the necessary EVPN control-plane and VXLAN data-plane reachability across data centers, the WAN must provide reachability for those fabric endpoints. This design can simplify service continuity and preserve the EVPN overlay model end-to-end, but it does not provide the clean security and QoS demarcation that exists in a decoupled gateway model. A clear demarcation between a border leaf and a separate gateway/WAN PE is specifically a property of decoupled gateway-based DCI, not gateway-less DCI. The gateway-less model also requires reachability between route reflectors or EVPN control-plane endpoints across sites. Therefore, option A is false because it incorrectly assigns the demarcation benefit to the gateway-less design. Reference: gateway-less DCI, stretched EVPN overlay, route-reflector and leaf reachability requirements.


問題 #38
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