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Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 20
In the exhibit, the default algorithm is used to elect the designated forwarder (DF) on ESI 1. Which PE is elected as DF for VPLS 10?
- A. PEI
- B. PE4
- C. PE2
- D. PE3
Answer: C
Explanation:
Explanation
PE2 is elected as DF for VPLS 10. The default algorithm uses the lowest IP address of thePEs attached to the same Ethernet segment as the tie-breaker criterion. PE2 has the lowest IP address among PE1, PE2, and PE3.
NEW QUESTION # 21
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- B. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
- C. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- D. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
Answer: A
Explanation:
Explanation
PE3 does not add an ESI label to packets forwarded to PE1 because PE1 is connected to the same Ethernet segment. PE3 adds an ESI label only to packets forwarded to PEs that are not connected to the same Ethernet segment, such as PE21.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 22
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. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- D. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
Answer: B
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 # 23
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. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
- C. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- D. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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 # 24
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
- B. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
- D. EVPN routes are advertised with a service label associated with the SBD VPLS.
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 # 25
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. 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.
- B. 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.
- 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. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
Answer: B
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 # 26
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- B. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- C. A-D per EVI routes and ES routes only
- 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 # 27
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. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
- D. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
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 # 28
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It specifies the service maximum transmission unit (MTU).
- B. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- D. It is applicable to EVPN VPLS services.
Answer: D
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 # 29
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. PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
- B. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
- C. PE2 inspects the service label and determines that it is associated with RVPLS 2.
- D. PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
Answer: B
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 # 30
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 advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
- C. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- D. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
Answer: B
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 # 31
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
- B. This service requires the use of EVPN-MPLS for data plane.
- C. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
- D. This service consists of a VPRN and multiple VPLSs.
Answer: B
Explanation:
Explanation
EVPN with integrated routing and bridging (EVPN-IRB) service does not require the use of EVPN-MPLS for data plane. EVPN-IRB service can use either EVPN-MPLS or EVPN-VXLAN for data plane.
NEW QUESTION # 32
In the exhibit, an EVI range is configured and the preference-based algorithm is used to elect the designated forwarder (DF) on ESI 1. Which PE is elected as DF for VPLS 10?
- A. PE3
- B. PEI
- C. PE2
- D. PE4
Answer: A
Explanation:
Explanation
PE3 is elected as DF for VPLS 10. The preference-based algorithm uses the highest preference value of the PEs attached to the same Ethernet segment as the tie-breaker criterion. PE3 has the highest preference value among PE1, PE2, and PE3.
NEW QUESTION # 33
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 is configured on PEI with a service MTU of 1514.
- D. This route indicates that the EVPN service configured on PEI is multi-homed.
Answer: C
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 # 34
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 # 35
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?
- A. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
- B. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
- C. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answer: B
Explanation:
Explanation
When the PE learns a local host IP address, it does not add an entry into its proxy-ARP table. The proxy-ARP table is populated by snooping IP packets received from remote PEs. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
NEW QUESTION # 36
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