4A0-115 Practice Test Questions Answers Updated 40 Questions
4A0-115 dumps & Nokia Service Routing Architect Sure Practice with 40 Questions
NEW QUESTION # 15
Examine the exhibit.
Which of the following statements about the EVPN routes exchanged for EVPN VPWS 2 is TRUE?
- A. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
- B. PEI advertises an A-D per EVI route that includes a tag ID set to 40.
- C. All PES advertise a MAC route that includes a non-zero MPLS label.
- D. PE2 advertises an A-D per EVI route that includes a P flag set to I.
Answer: C
Explanation:
Explanation
All PEs do not advertise a MAC route that includes a non-zero MPLS label. Only PE1 advertises a MAC route that includes a non-zero MPLS label, which is used by PE2 to forward traffic to PE1. PE2 and PE3 do not advertise any MAC routes for VPWS 21.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 16
Based on the exhibit below, which of the following statements is FALSE?
- A. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
- B. The MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.
- C. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- D. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
Answer: C
Explanation:
Explanation
When forwarding BUM traffic, the local PE does not replicate the traffic and send it as unicast to the advertising neighbor. Instead, the local PE uses an MPLS transport tunnel towards the advertising neighbor and sends the traffic with an MPLS label that indicates the service.
NEW QUESTION # 17
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?
- A. ES routes provide the ESI label required to support the split-horizon mechanism.
- B. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
- C. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.
- D. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
Answer: D
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 # 18
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 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
- C. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
- D. PE2 inspects the service label and determines that it is associated with RVPLS 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 # 19
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, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
- C. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows 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 # 20
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
- A. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
- B. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
- C. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- D. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
Answer: A
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 # 21
Examine the exhibit.
Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
- A. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- B. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- C. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
- D. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
Answer: A
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 # 22
An operator configures an EVPN-IRB that uses the interface-ful unnumbered forwarding model on a Nokia
7750 service router. Which ofthe following statements regarding the configuration performed on each participating PE is FALSE?
- A. A VPRN service is configured and has an interface bound to the local VPLS.
- B. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
- C. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- D. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
Answer: C
Explanation:
Explanation
The advertisement of IP-Prefix routes is not enabled in the SBD VPLS. The advertisement of IP-Prefix routes is enabled in the VPRN service that is associated with the SBD VPLS2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 23
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
Explanation
There are two MAC-VRFs in the exhibit, one for each EVI. A MAC-VRF is a logical entity that contains the MAC forwarding information for a given EVI1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 24
In the exhibit,
VPLS 20 is associated with a single-active Ethernet segment on routers PEI and PE3. Which of the following statementsis FALSE?
- A. PEI advertises an A-D per ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
- B. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
- C. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
- D. PEI advertises an A-D per EVI route which includes a P flag set to I to indicate that PEI is the DF for EVI 20.
Answer: B
Explanation:
Explanation
When PE1 learns MAC-01, it advertises a MAC/IP route which indicates that MAC-01 is associated with ESI
1. This route is used by remote PEs to populate their FDBs with MAC-01 and its corresponding ESI.
NEW QUESTION # 25
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. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- D. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
Answer: C
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 # 26
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- B. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- C. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- D. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
Answer: C
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 # 27
Examine the exhibit.
Which of the following statements about the operation of EVPN VPWS 4 is FALSE?
- A. PEI brings the SAP in VPWS 4 operationally down.
- B. PE2 receives a single A-D per EVI route. The route is originated from PE3.
- C. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
- D. PE3 sets the P flag in its advertised A-D per EVI route to I.
Answer: D
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 # 28
Based upon the exhibit, which of the following statements is FALSE?
- A. On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
- B. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
- C. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- D. A BGP export policy is required on PE3 and PE4 to ensure that IMET routes originated with VXLAN encapsulation are not advertised to the peer across the core network.
Answer: C
Explanation:
Explanation
VPLS 10 does not need to be configured with two BGP instances on PE3 and PE4. VPLS 10 can be configured with a single BGP instance that supports both VXLAN and MPLS encapsulations.
NEW QUESTION # 29
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. PEI
- B. PE3
- C. PE2
- D. PE4
Answer: B
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 # 30
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- 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 a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
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 # 31
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