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Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 19
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 tag ID set to 40.
- B. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
- C. PE2 advertises an A-D per EVI route that includes a P flag set to I.
- D. All PES advertise a MAC route that includes a non-zero MPLS label.
Answer: D
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 # 20
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. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
- D. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
Answer: D
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 # 21
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- B. CEI generates an update message to PEI withdrawing its MAC.
- C. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- D. PEI generates an update message to remote PES identifying the new location of CEI.
Answer: C
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 # 22
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 PE3.
- B. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- C. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- D. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
Answer: D
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 # 23
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 EVPN routes between PEI and PE3.
- B. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
- C. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- D. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
Answer: B
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 # 24
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
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 # 25
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. PE4
- B. PE3
- C. PE2
- D. PEI
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 # 26
In the exhibit, the interface-ful numbered model is used for the Layer-3 EVPN service. Which of the following is used as the source MAC address in the packets sent from PEI when forwarding customer traffic to Host 2?
- A. MAC-11
- B. MAC-04
- C. MAC-OI
- D. MAC-03
Answer: C
Explanation:
Explanation
MAC-01 is used as the source MAC address in the packets sent from PE1 when forwarding customer traffic to Host 2. MAC-01 is the MAC address of the SBD IRB interface configured in VPRN 11 on PE12.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 27
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 # 28
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 # 29
Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?
- A. The egress PE does not perform any Layer-3 route look up to forward traffic.
- B. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
- C. All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
- D. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
Answer: C
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 # 30
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
- B. It is applicable to EVPN VPLS services.
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- D. It specifies the service maximum transmission unit (MTU).
Answer: B
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 # 31
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. PE3 and PE4 exchange their service labels over an established targeted LDP session.
- B. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- C. PEI and PE3 exchange their service labels using A-D per EVI routes.
- D. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
Answer: C
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 # 32
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
- B. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
- C. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
- D. The VPRN service is configured to allow the advertisement of IP prefixes.
Answer: B
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 # 33
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 # 34
Based on the exhibit below, which of the following statements is TRUE?
- A. PE2 advertises this BGP update for a locally-configured VPWS service.
- B. PEI uses this BGP update to build the flooding list of the associated service.
- C. Neighbor 10.10.10.2 is connected to a multi-homed CE.
- D. PEI uses MPLS label 524284 when sending traffic destined to
Answer: B
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 # 35
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