[Jun 11, 2024] BraindumpQuiz 4A0-115 dumps & Nokia Service Routing Architect sure practice dumps
Nokia 4A0-115 Actual Questions and Braindumps
NEW QUESTION # 20
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 # 21
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 # 22
Examine the exhibit.
Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
- A. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- B. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
- C. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- D. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
Answer: A
Explanation:
Explanation
PE1 sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2. The ESI label is used to implement the split-horizon mechanism and prevent traffic duplication. The packet sent to PE3 does not need an ESI label because PE3 is connected to the same Ethernet segment as PE1.
NEW QUESTION # 23
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 # 24
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
- A. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
- B. The updates include an Ethernet tag ID that is set to zero.
- C. The updates are used to discover all the PES associated with an Ethernet segment.
- D. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
Answer: A
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 # 25
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 # 26
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 # 27
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
- B. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
- C. This service consists of a VPRN and multiple VPLSs.
- D. This service requires the use of EVPN-MPLS for data plane.
Answer: D
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 # 28
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 # 29
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 forwards traffic to all attached PES and receives traffic from a single PE.
- D. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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 # 30
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- B. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- C. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- D. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
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 # 31
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 # 32
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 # 33
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements isFALSE?
- A. 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.
- B. 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.
- C. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
- D. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
Answer: B
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 # 34
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 # 35
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 # 36
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