Pass Exam Questions Efficiently With 4A0-115 Questions (2023)
4A0-115 Questions - Truly Beneficial For Your Nokia Exam
Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 13
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
- A. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
- B. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
- C. The updates include an Ethernet tag ID that is set to zero.
- D. The updates are used to discover all the PES associated with an Ethernet segment.
Answer: B
Explanation:
Explanation
A PE does not advertise an A-D per EVI route for each operational service defined on an Ethernet segment. A PE advertises a single A-D per EVI route for all services defined on an Ethernet segment.
NEW QUESTION # 14
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements isFALSE?
- A. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
- B. On PE3, the routing table for VPRN 15 contains an entry for 10.10.4.0/24. This entry is resolved using a transport tunnel towards PEA.
- C. On PE3, the routing table for VPRN 15 contains an entry for 10.10.1.0/24. This entry is resolved to MAC-OI as an overlay index.
- D. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
Answer: C
Explanation:
Explanation
On PE3, the routing table for VPRN 15 does not contain an entry for 10.10.1.0/24. This entry is not needed because Host 1 is in the same subnet as the SBD IRB interface on PE3, and PE3 can reach Host 1 using its MAC address2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 15
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 tag ID that is set to zero.
- B. The updates include an Ethernet segment identifier label that is used in loop prevention.
- C. The updates advertise the Ethernet segment availability in a given EVPN service.
- D. The updates include an MPLS label that is set to a non-zero value.
Answer: A
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 # 16
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, A-D per ES routes, and Ethernet segment (ES) routes
- C. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- D. A-D per EVI routes and ES routes only
Answer: B
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 # 17
Examine the exhibit.
Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?
- A. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
- B. The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
- C. The local AC tag ID and the remote AC tag ID configured on PE2 must match.
- D. The local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.
Answer: A
Explanation:
Explanation
The local AC tag ID configured on PE2 must match the local AC tag ID configured on PE1. This ensures that the tag IDs are consistent across both ends of the VPWS service. The remote AC tag ID configured on PE2 does not need to match the remote AC tag ID configured on PE3, as long as they are unique within each PE1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 18
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. 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.
- C. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- D. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
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 # 19
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?
- A. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
- B. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- C. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
- D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answer: A
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 # 20
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 local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- D. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
Answer: D
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 # 21
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 local hosts.
- C. EVPN routes are advertised with a service label associated with the SBD VPLS.
- D. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
Answer: D
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 # 22
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 specifies a P flag that indicates whether the advertising PE is a primary PE.
- C. It specifies the service maximum transmission unit (MTU).
- 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 # 23
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-OI
- B. MAC-11
- C. MAC-03
- D. MAC-04
Answer: A
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 # 24
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- B. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
- C. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
- D. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
Answer: B
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 # 25
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PEI generates an update message to remote PES identifying the new location of CEI.
- 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. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
Answer: D
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 # 26
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 EVI route which includes a P flag set to I to indicate that PEI is the DF for EVI 20.
- B. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
- C. PEI advertises an A-D per ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
- D. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
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 # 27
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?
- A. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
- B. ES routes provide the ESI label required to support the split-horizon mechanism.
- C. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.
- D. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
Answer: A
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 # 28
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 MPLS label 524284 when sending traffic destined to
- C. PEI uses this BGP update to build the flooding list of the associated service.
- D. Neighbor 10.10.10.2 is connected to a multi-homed CE.
Answer: C
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 # 29
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