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Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 13
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
- B. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- C. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
- D. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
Answer: C
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 # 14
Examine the exhibit.
Which of the following statements about the operation of EVPN VPWS 4 is FALSE?
- A. PE2 receives a single A-D per EVI route. The route is originated from PE3.
- B. PE3 sets the P flag in its advertised A-D per EVI route to I.
- C. PEI brings the SAP in VPWS 4 operationally down.
- D. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
Answer: B
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 # 15
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 # 16
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. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
- C. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- 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 # 17
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- B. A-D per EVI routes and ES routes only
- C. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- D. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
Answer: A
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 # 18
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. This service requires the use of EVPN-MPLS for data plane.
- B. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
- C. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
- D. This service consists of a VPRN and multiple VPLSs.
Answer: A
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 # 19
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. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- C. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- D. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
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 # 20
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
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 # 21
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 the service maximum transmission unit (MTU).
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- 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 # 22
Which of the following statements about EVPN auto-discovery per Ethernet segment (A-D per ES) routes is TRUE?
- A. The updates include an MPLS label that is set to a non-zero value.
- B. The updates include an Ethernet tag ID that is set to zero.
- C. The updates advertise the Ethernet segment availability in a given EVPN service.
- D. The updates include an Ethernet segment identifier label that is used in loop prevention.
Answer: B
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 # 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-03
- C. MAC-04
- D. MAC-11
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 best describes the operation of a non-designated forwarder (non-DF) in a single-active Ethernet segment?
- A. Blocks Tx unicast, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM
- B. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
- C. Allows Tx unicast, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
- D. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
Answer: D
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 # 25
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. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
- C. 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.
- D. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
Answer: D
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 # 26
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. PE4
- B. PE2
- C. PEI
- D. PE3
Answer: D
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 # 27
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
- B. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- C. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- D. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
Answer: A
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 # 28
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. PE2 advertises an A-D per EVI route that includes a P flag set to I.
- C. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
- 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 # 29
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