Pass 4A0-115 Exam Latest Practice Questions Updated on Jan 25, 2024
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NEW QUESTION # 16
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. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- D. CEI generates an update message to PEI withdrawing its MAC.
Answer: C
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 # 17
Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?
- A. All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
- B. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
- C. The egress PE does not perform any Layer-3 route look up to forward traffic.
- D. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
Answer: A
Explanation:
Explanation
All VPLS instances do not need to be configured on all PEs regardless of whether they have a local host or not. Only the VPRN instance needs to be configured on all PEs, while the VPLS instances are configured only on PEs that have a local host attached to them.
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. This service consists of a VPRN and multiple VPLSs.
- C. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
- D. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
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 PE-to-PE MAC address advertisement is FALSE?
- A. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
- B. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
- C. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
- 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 # 20
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It is applicable to EVPN VPLS services.
- B. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- D. It specifies the service maximum transmission unit (MTU).
Answer: A
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 # 21
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?
- A. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
- B. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
- C. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answer: B
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 # 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 but not to PE3 because PE3 is connected to the originating ES.
- C. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
- 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 statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
- A. The updates include an Ethernet tag ID that is set to zero.
- B. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
- 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: 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 # 24
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?
- A. ES routes provide the ESI label required to support the split-horizon mechanism.
- B. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.
- C. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
- D. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
Answer: C
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 # 25
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 is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
- B. This route indicates that the EVPN service configured on PEI is multi-homed.
- C. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
- D. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
Answer: D
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 # 26
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
- B. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- D. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
Answer: B
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 # 27
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 # 28
Based on the exhibit below, which of the following statements is FALSE?
- A. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
- B. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
- C. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- D. The MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.
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 # 29
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?
- A. Each PE verifies that the received tag ID matches its configured local AC tag ID.
- B. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- C. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
- D. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
Answer: D
Explanation:
Explanation
The advertised A-D per EVI route includes a non-zero tag ID and a zero MPLS label. The tag ID is used to identify the VPWS service, while the MPLS label is not used for single-homed VPWS services1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 30
Which of the following statements about the EVPN data plane is FALSE?
- A. EVPN-MPLS provides services over a simple IP network.
- B. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
- C. EVPN allows a service provider to deliver multiple services over a single core network.
- D. The customer data is encapsulated and then tunneled between the PE routers.
Answer: A
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 # 31
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- B. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- C. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
- 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 # 32
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