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Free Nokia Service Routing Architect 4A0-115 Official Cert Guide PDF Download
Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 10
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-11
- B. MAC-OI
- C. MAC-03
- D. MAC-04
Answer: B
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 # 11
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 # 12
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?
- A. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
- B. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- C. Each PE verifies that the received tag ID matches its configured local AC tag ID.
- 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 # 13
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. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- B. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
- C. PEI and PE3 exchange their service labels using A-D per EVI routes.
- D. PE3 and PE4 exchange their service labels over an established targeted LDP session.
Answer: C
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 # 14
What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?
- A. To advertise the redundancy mode of a local Ethernet segment
- B. To discover all PES attached to the same Ethernet segment
- C. To discover all PES participating in the same VPIS service
- D. To advertise the MAC or MAC/IP addresses of locally-learned hosts
Answer: C
Explanation:
Explanation
EVPN inclusive multicast Ethernet tag (IMET) routes are used to discover all PEs participating in the same VPIS service. These routes are also used to build the flooding list for BUM traffic.
NEW QUESTION # 15
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- B. EVPN routes are advertised with a service label associated with the SBD VPLS.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
- D. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
Answer: A
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 # 16
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 and the remote AC tag ID configured on PE2 must match.
- 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 PEI must match the local AC tag ID configured on PE3.
- D. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
Answer: D
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 # 17
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 # 18
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 10.10.1.0/24. This entry is resolved to MAC-OI as an overlay index.
- B. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
- C. 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.
- D. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
Answer: A
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 # 19
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. 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.
- B. 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.
- C. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
- D. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
Answer: A
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 # 20
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
- A. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- B. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
- C. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- D. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
Answer: D
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 # 21
Based on the exhibit below, which of the following statements is TRUE?
- A. PEI uses this BGP update to build the flooding list of the associated service.
- B. PE2 advertises this BGP update for a locally-configured VPWS 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: A
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 # 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 PE3.
- B. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- C. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- D. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
Answer: B
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
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- B. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- C. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- D. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
Answer: C
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 # 24
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. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
- B. 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.
- C. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
- D. PEI advertises an A-D per ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
Answer: A
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 # 25
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