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Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 17
Which of the following statements about the EVPN data plane is FALSE?
- A. EVPN allows a service provider to deliver multiple services over a single core network.
- B. EVPN-MPLS provides services over a simple IP network.
- C. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
- D. The customer data is encapsulated and then tunneled between the PE routers.
Answer: B
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 # 18
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?
- A. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
- 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 uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
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 # 19
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 include an MPLS label that is set to a non-zero value.
- C. The updates include an Ethernet tag ID that is set to zero.
- D. The updates advertise the Ethernet segment availability in a given EVPN service.
Answer: C
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 # 20
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 # 21
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 supplementary broadcast domain (SBD) is configured as a routed 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 VPRN service is configured and has an interface bound to the local 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 # 22
What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?
- A. To discover all PES participating in the same VPIS service
- B. To advertise the MAC or MAC/IP addresses of locally-learned hosts
- C. To discover all PES attached to the same Ethernet segment
- D. To advertise the redundancy mode of a local Ethernet segment
Answer: A
Explanation:
Explanation
EVPN inclusive multicast Ethernet tag (IMET) routes are used to discover all PEs participating in the same VPIS service. These routes are also used to build the flooding list for BUM traffic.
NEW QUESTION # 23
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- B. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- C. CEI generates an update message to PEI withdrawing its MAC.
- D. PEI generates an update message to remote PES identifying the new location of CEI.
Answer: A
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 # 24
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- B. It is applicable to EVPN VPLS services.
- 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: 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 # 25
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- B. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- C. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- D. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
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 # 26
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 consists of a VPRN and multiple VPLSs.
- D. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
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 # 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 same tag ID must be configured for the local attachment circuit (AC) at each PE.
- C. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
- D. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
Answer: C
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
Based on the exhibit below, which of the following statements is FALSE?
- A. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- 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. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
- D. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
Answer: A
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 # 29
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. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
- 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: B
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 # 30
Based on the exhibit below, which of the following statements is TRUE?
- A. PEI uses this BGP update to build the flooding list of the associated service.
- B. PE2 advertises this BGP update for a locally-configured VPWS service.
- C. PEI uses MPLS label 524284 when sending traffic destined to
- D. Neighbor 10.10.10.2 is connected to a multi-homed CE.
Answer: A
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 # 31
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
- B. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- C. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- D. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
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 # 32
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 # 33
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