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Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 24
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, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM
- B. Allows Tx unicast, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
- C. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
- D. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
Answer: C
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 # 25
Based upon the exhibit, which of the following statements is FALSE?
- A. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
- B. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- C. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
- D. PEI populates this information into the local VPLS FDB.
Answer: A
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 # 26
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
- B. IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
- C. The VPRN service is configured to allow the advertisement of IP prefixes.
- D. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
Answer: D
Explanation:
Explanation
The SBD IRB interface configured in the VPRN service has an IP address assigned to it. The IP address is used as a gateway IP address for hosts in the corresponding subnet2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 27
Examine the exhibit.
Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
- A. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- B. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- C. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
- D. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
Answer: B
Explanation:
Explanation
PE1 sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2. The ESI label is used to implement the split-horizon mechanism and prevent traffic duplication. The packet sent to PE3 does not need an ESI label because PE3 is connected to the same Ethernet segment as PE1.
NEW QUESTION # 28
In the exhibit, the interface-less forwarding model is used for the Layer-3 EVPN service. Which of the following statements about traffic forwarding from Host 1 to Host 2 is FALSE?
- A. PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
- B. PE2 inspects the service label and determines that it is associated with RVPLS 2.
- C. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
- D. PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
Answer: C
Explanation:
Explanation
PE1 does not encapsulate the packet with two labels: an outer transport label and an inner service label. PE1 encapsulates the packet with three labels: an outer transport label, a service label associated with VPRN 11, and a service label associated with RVPLS 11.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 29
In the exhibit, PE2 is receiving an EVPN auto-discovery (A-D) route from PEI. Based on the output, which of the following statements is FALSE?
- A. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
- B. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
- C. This route indicates that the EVPN service configured on PEI is multi-homed.
- D. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
Answer: D
Explanation:
Explanation
This route indicates that the EVPN service is configured on PE1 with a service MTU of 1500, not 1514. The service MTU is indicated by the MPLS label value in hexadecimal format. The MPLS label value of 0x05DC corresponds to a decimal value of 1500.
NEW QUESTION # 30
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. EVPN routes are advertised with a service label associated with the SBD VPLS.
- B. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- C. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
- D. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
Answer: B
Explanation:
Explanation
EVPN MAC/IP routes are not used to advertise the MAC and IP addresses of SBD IRB interfaces. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts attached to the SBD VPLS2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 31
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It is applicable to EVPN VPLS services.
- B. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- C. It specifies the service maximum transmission unit (MTU).
- D. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
Answer: A
Explanation:
Explanation
The EVPN Layer 2 Attributes extended community is not applicable to EVPN VPLS services. It is applicable to EVPN VPWS services, where it carries information such as the tag ID and the service MTU1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 32
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- B. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
- C. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- D. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
Answer: C
Explanation:
Explanation
PE1 does not advertise a MAC route for MAC-01 when its VPLS 20's SAP becomes operationally UP. PE1 advertises an EVPN MAC/IP route for MAC-01, which includes the IP address of Host 1 and the ESI of the Ethernet segment1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 33
Examine the exhibit.
Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?
- A. The local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.
- B. The local AC tag ID and the remote AC tag ID configured on PE2 must match.
- C. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
- D. The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
Answer: C
Explanation:
Explanation
The local AC tag ID configured on PE2 must match the local AC tag ID configured on PE1. This ensures that the tag IDs are consistent across both ends of the VPWS service. The remote AC tag ID configured on PE2 does not need to match the remote AC tag ID configured on PE3, as long as they are unique within each PE1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 34
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- B. A-D per EVI routes and ES routes only
- C. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- D. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
Answer: D
Explanation:
Explanation
A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes are exchanged to support the operation of a multi-homed EVPN VPWS. These routes are used to discover all PEs associated with an Ethernet segment, indicate the redundancy mode of the Ethernet segment, and elect the designated forwarder for each service.
NEW QUESTION # 35
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. CEI generates an update message to PEI withdrawing its MAC.
- B. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- C. PEI generates an update message to remote PES identifying the new location of CEI.
- D. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
Answer: D
Explanation:
Explanation
PE2 advertises a MAC/IP route for MAC1 with a sequence number higher than that received from PE1. This indicates that MAC1 has moved from PE1 to PE2 and triggers a MAC withdrawal message from PE1 to remote PEs. CE1 does not generate an update message to PE1 withdrawing its MAC, nor does PE1 generate an update message to remote PEs identifying the new location of CE11.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 36
Based on the exhibit below, which of the following statements is TRUE?
- A. PEI uses MPLS label 524284 when sending traffic destined to
- B. Neighbor 10.10.10.2 is connected to a multi-homed CE.
- C. PEI uses this BGP update to build the flooding list of the associated service.
- D. PE2 advertises this BGP update for a locally-configured VPWS service.
Answer: C
Explanation:
Explanation
PE1 uses this BGP update to build the flooding list of the associated service. The update contains an IMET route that indicates that neighbor 10.10.10.2 is participating in a VPLS service with a network identifier of 10.
NEW QUESTION # 37
In the exhibit, VPWS 4 enables communications between CEI and CE2. Which of the following statements regarding the operation of VPWS 4 is FALSE?
- A. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- B. PE3 and PE4 exchange their service labels over an established targeted LDP session.
- C. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
- D. PEI and PE3 exchange their service labels using A-D per EVI routes.
Answer: D
Explanation:
Explanation
PE1 and PE3 do not exchange their service labels using A-D per EVI routes. PE1 and PE3 exchange their service labels using MAC routes, which are advertised when their local ACs become operationally UP1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 38
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
- A. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- B. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- C. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
- D. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
Answer: D
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 # 39
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- B. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
- C. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
- D. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
Answer: D
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 # 40
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