Unique Top-selling 4A0-115 Exams - New 2024 Nokia Pratice Exam
Nokia Service Routing Architect Dumps 4A0-115 Exam for Full Questions - Exam Study Guide
Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 20
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. PE3
- B. PE2
- C. PEI
- D. PE4
Answer: A
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 # 21
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. PE3
- B. PEI
- C. PE4
- D. PE2
Answer: D
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 # 22
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. 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 ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
- 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 # 23
In the exhibit, the EVPN-IRB is configured to use the interface-ful unnumbered model. Which of the following statements regarding the route advertisement is FALSE?
- A. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
- B. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
- C. PE4 advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. The BGP update includes MAC-04 as an overlay index.
- D. PEI advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE3. The BGP update includes MAC-OI as on overlay index.
Answer: C
Explanation:
Explanation
PE4 does not advertise an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. PE4 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE2, which includes the MPLS service label of VPRN 152.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 24
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 encapsulated data has a label that uniquely identifies each service.
- C. EVPN-MPLS provides services over a simple IP network.
- D. The customer data is encapsulated and then tunneled between the PE routers.
Answer: C
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 # 25
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
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 # 26
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. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- B. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
- C. A VPRN service is configured and has an interface bound to the local VPLS.
- D. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
Answer: A
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 # 27
Based upon the exhibit, which of the following statements is FALSE?
- A. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- 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. On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
- D. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
Answer: A
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 # 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 this BGP update to build the flooding list of the associated 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: 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 # 29
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 # 30
In the exhibit, PE2 is receiving an EVPN auto-discovery (A-D) route from PEI. Based on the output, which of the following statements is FALSE?
- A. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
- B. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
- C. This route indicates that the EVPN service configured on PEI is multi-homed.
- D. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
Answer: A
Explanation:
Explanation
This route indicates that the EVPN service is configured on PE1 with a service MTU of 1500, not 1514. The service MTU is indicated by the MPLS label value in hexadecimal format. The MPLS label value of 0x05DC corresponds to a decimal value of 1500.
NEW QUESTION # 31
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 PEI must match the local AC tag ID configured on PE3.
- 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 configured on PE2 must match the local AC tag ID configured on PEI.
- D. The local AC tag ID and the remote AC tag ID configured on PE2 must match.
Answer: C
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 # 32
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. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- C. PEI generates an update message to remote PES identifying the new location of CEI.
- D. CEI generates an update message to PEI withdrawing its MAC.
Answer: B
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 # 33
Based upon the exhibit, which of the following statements is FALSE?
- A. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
- B. PEI populates this information into the local VPLS FDB.
- C. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- D. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
Answer: D
Explanation:
Explanation
PE1 does not use VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3. PE1 uses MPLS tunnels to reach these neighbors, as indicated by the MPLS label values in the output.
NEW QUESTION # 34
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
- B. The VPRN service is configured to allow the advertisement of IP prefixes.
- C. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
- D. IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
Answer: A
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 # 35
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- B. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
- C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- D. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
Answer: D
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 # 36
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