4A0-115 Dumps PDF 2023 Program Your Preparation EXAM SUCCESS

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Nokia 4A0-115 Exam Syllabus Topics:

Topic	Details
Topic 1	Operation of a single-active EVPN VPWS EVPN route types advertised to support EVPN VPWS
Topic 2	EVPN route types advertised to support EVPN VPLS Use of EVPN IMET routes to populate the VPLS flooding lists
Topic 3	Use of EVPN routes to populate route tables EVPN integrated routing and bridging (IRB) architecture
Topic 4	Use of EVPN to support Layer-3 routing EVPN basic operation
Topic 5	Configuring an EVPN VPLS using VXLAN encapsulation Use of EVPN MAC routes to populate the VPLS FDB tables
Topic 6	Use of EVPN for data center services EVPN route types required to support multi-homing
Topic 7	Operation of preference-based DF election algorithm Aliasing mechanism used to enable load-balancing
Topic 8	Layer-3 symmetric interface-ful numbered model EVPN route types advertised to support EVPN-IRB

 

NEW QUESTION # 14
Which of the following statements about the EVPN data plane is FALSE?

• A. The customer data is encapsulated and then tunneled between the PE routers.
• B. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
• C. EVPN-MPLS provides services over a simple IP network.
• D. EVPN allows a service provider to deliver multiple services over a single core network.

Answer: C

Explanation:
Explanation
EVPN-MPLS provides services over an MPLS network, not a simple IP network. The customer data is encapsulated with an MPLS label that identifies the service and then tunneled between the PE routers using MPLS LSPs1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 15
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?

• A. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
• B. ES routes provide the ESI label required to support the split-horizon mechanism.
• C. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
• D. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.

Answer: C

Explanation:
Explanation
Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment. The redundancy mode can be either single-active or all-active, and it determines how traffic is forwarded to and from a multi-homed CE1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 16
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?

• A. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
• B. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
• C. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
• D. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.

Answer: C

Explanation:
Explanation
In the interface-ful model, VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS. The MAC/IP routing information is not used to populate the VPRN routing table at the remote PEs, but rather to populate the FDB of the SBD VPLS2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia

NEW QUESTION # 17
In the exhibit, the EVPN-IRB is configured to use the interface-ful unnumbered model. Which of the following statements regarding the route advertisement is FALSE?

• A. PE4 advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. The BGP update includes MAC-04 as an overlay index.
• B. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
• C. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
• D. PEI advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE3. The BGP update includes MAC-OI as on overlay index.

Answer: A

Explanation:
Explanation
PE4 does not advertise an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. PE4 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE2, which includes the MPLS service label of VPRN 152.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia

NEW QUESTION # 18
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?

• A. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
• B. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
• C. The updates include an Ethernet tag ID that is set to zero.
• D. The updates are used to discover all the PES associated with an Ethernet segment.

Answer: B

Explanation:
Explanation
A PE does not advertise an A-D per EVI route for each operational service defined on an Ethernet segment. A PE advertises a single A-D per EVI route for all services defined on an Ethernet segment.

NEW QUESTION # 19
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?

• A. Each PE verifies that the received tag ID matches its configured local AC tag ID.
• B. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
• C. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
• D. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.

Answer: D

Explanation:
Explanation
The advertised A-D per EVI route includes a non-zero tag ID and a zero MPLS label. The tag ID is used to identify the VPWS service, while the MPLS label is not used for single-homed VPWS services1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 20
Which of the following statements about multi-homing for a Layer-2 service is TRUE?

• A. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
• B. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
• C. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
• D. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.

Answer: A

Explanation:
Explanation
In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE. This provides load balancing and redundancy for the CE. The CE does not require a LAG to be configured between the CE and all attached PEs1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 21
Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?

• A. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
• B. The egress PE does not perform any Layer-3 route look up to forward traffic.
• C. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
• D. All VPLS instances must be configured on all PES regardless of whether they have a local host or not.

Answer: D

Explanation:
Explanation
All VPLS instances do not need to be configured on all PEs regardless of whether they have a local host or not. Only the VPRN instance needs to be configured on all PEs, while the VPLS instances are configured only on PEs that have a local host attached to them.

NEW QUESTION # 22
Examine the exhibit.

Which of the following statements about the operation of EVPN VPWS 4 is FALSE?

• A. PE2 receives a single A-D per EVI route. The route is originated from PE3.
• B. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
• C. PE3 sets the P flag in its advertised A-D per EVI route to I.
• D. PEI brings the SAP in VPWS 4 operationally down.

Answer: C

Explanation:
Explanation
PE3 does not set the P flag in its advertised A-D per EVI route to 1. PE3 sets the P flag to 0, indicating that it is not the DF for EVI 20. PE1 sets the P flag to 1, indicating that it is the DF for EVI 201.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 23
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?

• A. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
• B. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
• C. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
• D. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.

Answer: B

Explanation:
Explanation
Route targets are not used to uniquely identify routes between EVIs in the case of MAC address overlaps.
Route targets are used to control the import and export of routes between different EVIs or VRFs. The service distinguisher (label or VNI) is used to uniquely identify each service1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 24
Examine the exhibit.

Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?

• A. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
• B. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
• C. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
• D. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.

Answer: C

Explanation:
Explanation
The advertisement of IP-Prefix routes is not required to enable Layer-2 communication between CE1 and CE2. IP-Prefix routes are used to enable Layer-3 communication between different subnets in an EVPN-IRB service. For Layer-2 communication, only MAC/IP routes are required2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia

NEW QUESTION # 25
Which of the following best describes the operation of a non-designated forwarder (non-DF) in a single-active Ethernet segment?

• A. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
• B. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
• C. Allows Tx unicast, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
• D. Blocks Tx unicast, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM

Answer: A

Explanation:
A non-designated forwarder (non-DF) in a single-active Ethernet segment blocks Tx unicast, allows Rx unicast, blocks Tx BUM, and allows Rx BUM.
This prevents traffic duplication and ensures that only the DF forwards traffic to and from the CE.

NEW QUESTION # 26
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements isFALSE?

• A. On PE3, the routing table for VPRN 15 contains an entry for 10.10.4.0/24. This entry is resolved using a transport tunnel towards PEA.
• B. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
• C. On PE3, the routing table for VPRN 15 contains an entry for 10.10.1.0/24. This entry is resolved to MAC-OI as an overlay index.
• D. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.

Answer: C

Explanation:
Explanation
On PE3, the routing table for VPRN 15 does not contain an entry for 10.10.1.0/24. This entry is not needed because Host 1 is in the same subnet as the SBD IRB interface on PE3, and PE3 can reach Host 1 using its MAC address2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia

NEW QUESTION # 27
Based upon the exhibit, which of the following statements is FALSE?

• A. PEI populates this information into the local VPLS FDB.
• B. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
• C. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
• D. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.

Answer: D

Explanation:
Explanation
PE1 does not use VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3. PE1 uses MPLS tunnels to reach these neighbors, as indicated by the MPLS label values in the output.

NEW QUESTION # 28
Which of the following statements about EVPN auto-discovery per Ethernet segment (A-D per ES) routes is TRUE?

• A. The updates include an Ethernet segment identifier label that is used in loop prevention.
• B. The updates advertise the Ethernet segment availability in a given EVPN service.
• C. The updates include an MPLS label that is set to a non-zero value.
• D. The updates include an Ethernet tag ID that is set to zero.

Answer: D

Explanation:
Explanation
EVPN auto-discovery per Ethernet segment (A-D per ES) routes do not include an Ethernet tag ID that is set to zero. The Ethernet tag ID is set to a non-zero value that identifies the EVPN service instance1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

NEW QUESTION # 29
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