Pass Nokia 4A0-115 Exam with Guarantee Updated 40 Questions
Latest 4A0-115 Pass Guaranteed Exam Dumps Certification Sample Questions
NEW QUESTION # 19
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 # 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. 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 # 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 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 # 22
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?
- A. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- B. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
- C. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
- D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answer: C
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 # 23
Which of the following statements about the EVPN data plane is FALSE?
- A. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
- B. The customer data is encapsulated and then tunneled between the PE routers.
- C. EVPN allows a service provider to deliver multiple services over a single core network.
- D. EVPN-MPLS provides services over a simple IP network.
Answer: D
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 # 24
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. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- C. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- D. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
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 # 25
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 # 26
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 redundancy mode of a local Ethernet segment
- C. To advertise the MAC or MAC/IP addresses of locally-learned hosts
- D. To discover all PES attached to the same 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 # 27
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 # 28
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 # 29
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 # 30
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 # 31
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?
- A. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
- 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 advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
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 # 32
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 inspects the service label and determines that it is associated with RVPLS 2.
- B. PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
- C. PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
- D. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
Answer: D
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 # 33
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 # 34
Based on the exhibit below, which of the following statements is FALSE?
- A. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards 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. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- D. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
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 # 35
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