Services

A service provider is deploying MPLS Layer 3 VPN and needs to ensure that BGP next-hop resolution works correctly for VPNv4 prefixes learned from a route reflector. The PE routers are directly connected to the RR via iBGP, and there is an IGP running within the MPLS core. Which condition must be met for the PE to install the VPNv4 prefix into its routing table?

A service provider is designing a multicast solution for a Layer 3 VPN. They want to use MVPN with BGP signaling (draft-rosen). The PE routers are configured with VRF and multicast routing enabled. Which BGP address family must be enabled between PE routers to carry multicast routing information?

A network engineer is troubleshooting an MPLS TE tunnel that is not coming up. The tunnel is configured with a strict explicit path, and the path includes an interface that is currently down. Which action should the engineer take to allow the tunnel to use an alternative path?

Which TWO statements about BGP FlowSpec (RFC 8955) are correct?

Which THREE characteristics apply to the BGP-LS (BGP Link State) protocol?

Refer to the exhibit. A service provider is applying this QoS policy on a PE-CE interface. The business customer complains that voice traffic (marked with DSCP EF) experiences drops during congestion. What is the likely cause?

Refer to the exhibit. A network engineer is troubleshooting MPLS forwarding for prefix 10.10.10.0/24. The router shows two entries. What does the 'Pop tag' in the outgoing tag indicate?

A service provider is implementing L2VPN using EoMPLS. The CE devices are connected to two different PE routers, and the PE routers are configured with xconnect under the attachment circuit. Which command is required on the PE routers to establish the pseudowire?

A service provider is troubleshooting BGP route advertisement for a VPNv4 prefix. The PE router receives the prefix from the route reflector but does not install it in the VRF routing table. The BGP table shows the prefix as valid but not best. What is the most likely cause?

A service provider is deploying MPLS Layer 3 VPNs and wants to ensure that customer traffic is not dropped when a PE-CE link fails. The CE router is using static routing. Which design should be implemented to provide fast convergence?

Refer to the exhibit. A service provider is receiving BGP prefixes from a customer (AS 64512). The provider wants to tag all routes from that customer that match prefix 10.1.0.0/16 or more specific with community 65000:100, while not modifying other routes. After applying the configuration, which statement is true?

A service provider is planning to offer L2VPN services using MPLS. Which TWO statements are true regarding Ethernet over MPLS (EoMPLS) and Virtual Private LAN Service (VPLS)?

A service provider has a network with multiple PE routers providing MPLS L3VPN services. Customers are complaining that some remote sites are unreachable after a recent software upgrade on PE1. Upon investigation, you notice that PE1 is receiving BGP VPNv4 routes from the route reflector, but some routes are not being installed in the VRF routing table. PE1 is configured with BGP additional-path capability and has a route policy that selects only the best path. The VRF on PE1 has import and export route targets configured correctly. The missing routes have a higher local preference but are not selected due to a tie-break in BGP path selection. Which action should be taken to ensure that all valid routes are installed in the VRF?

Which THREE of the following L3VPN services require the use of a dedicated control plane per VPN instance?

Refer to the exhibit. CE1 is not receiving the VPNv4 route for the 192.168.1.0/24 subnet. What is the most likely cause?

A service provider is deploying a point-to-point Layer 2 VPN across an MPLS network using Ethernet over MPLS (EoMPLS) with Martini encapsulation. The customer requires transparent transport of VLAN tags (Q-in-Q) between two sites. The provider configures the attachment circuits on the PE routers as VLAN subinterfaces with dot1q encapsulation. After configuration, the customer reports that only untagged frames pass through the pseudowire; double-tagged frames are dropped at the egress PE. Which action resolves the issue?

Drag and drop the steps to configure a GRE tunnel on a Cisco router into the correct order.

Match each Segment Routing component to its function.

A service provider is migrating its MPLS core from LDP to Segment Routing with MPLS data plane (SR-MPLS). The network currently uses TE tunnels with RSVP-TE for traffic engineering. Which technology can the provider use to continue performing traffic engineering after the migration without requiring RSVP-TE?

A service provider is deploying EVPN-VPWS to replace legacy pseudowire connections for point-to-point Layer 2 services. They notice that MAC addresses learned from a CE device are not properly advertised to the remote PE. Which EVPN route type is responsible for advertising MAC address reachability information in a VPWS scenario?

A network engineer is configuring QoS on a Cisco ASR 9000 router to support multiple traffic classes. The policy must ensure that real-time traffic (EF) is not starved by high-volume bulk data (AF11). Which queuing strategy should be applied to the EF class to provide low latency and strict priority?

A service provider is implementing Multicast VPN (MVPN) in an MPLS backbone. They use Rosen GRE (draft-rosen) for multicast transport. What is the primary limitation of Rosen GRE compared to mLDP-based MVPN?

An SP is designing a MPLS L3VPN service with BGP as the PE-CE routing protocol. They want to ensure that the CE router does not become a transit router between two sites. Which BGP feature should be configured on the PE to prevent the CE from advertising routes received from one site to another?

A service provider is deploying LISP (Locator/ID Separation Protocol) to provide mobility and multihoming for customer endpoints. Which LISP component is responsible for maintaining the mapping between Endpoint Identifiers (EIDs) and Routing Locators (RLOCs) and for responding to Map-Request messages from ITRs?

A customer is connected to a service provider MPLS L3VPN network using BGP. The CE advertises a prefix 10.1.1.0/24 to the PE. On the PE, the customer's VRF route table shows the route with the next-hop set to the CE. When the PE receives a packet destined to 10.1.1.1, what label stack will the PE apply before forwarding the packet across the MPLS core?

A service provider is implementing QoS policies on an access aggregation router. They want to shape traffic to a downstream DSLAM to 10 Mbps, but they do not want to exceed the shaping rate even if the line rate is higher. Which QoS tool should be used on the interface facing the DSLAM?

An SP is troubleshooting an MPLS L2VPN VPLS network where MAC flapping is occurring between two PEs. Which mechanism in VPLS prevents loops and ensures that a broadcast frame from one PE is not reflected back to the originating PE?

Which TWO of the following are characteristics of Segment Routing (SR-MPLS) compared to traditional LDP-based MPLS? (Select two.)

Which THREE of the following are correct statements about EVPN-VXLAN in a data center fabric? (Select three.)

Which TWO of the following are services that can be offered using MPLS Layer 3 VPN (L3VPN) technology? (Select two.)

A service provider deploys MPLS L3VPN to connect multiple customer sites. Which VPN address family must be enabled on the PE routers to exchange customer IPv4 routes between PEs?

A network engineer is troubleshooting slow BGP convergence after a link failure in an MPLS core. Which feature can be enabled on the PE routers to fast-failover traffic upon BGP next-hop unreachability?

Refer to the exhibit. CE1 is unable to ping the loopback of a remote CE. Which configuration change is required on PE1 to enable communication?

A customer requires MPLS Layer 2 VPN connectivity between two sites using Pseudowire. Which control protocol is used to signal the pseudowire label?

Which technology allows a service provider to offer different classes of service over a single MPLS network?

Refer to the exhibit. A network engineer applies this policy on the PE-CE link. What is the expected behavior for VoIP traffic matching the access list?

During a multicast deployment, some receivers are not receiving the stream. The PIM neighbor table shows the upstream interface is correct. Which command would verify whether the multicast routing table has the correct outgoing interface list?

A service provider wants to provide Internet access to an MPLS L3VPN customer without leaking the Internet route into the VRF. Which feature allows the PE to forward traffic from the VRF to the global routing table?

Refer to the exhibit. Which statement about this BGP configuration is true?

Which TWO features are used to improve BGP convergence in an MPLS VPN environment?

Which THREE components are required to deploy MPLS Layer 3 VPN?

Which TWO statements about QoS policy propagation via BGP (QPPB) are correct?

Refer to the exhibit. Which prerequisite for MPLS L3VPN is missing on PE1?

Refer to the exhibit. Which statement is true regarding the forwarding entry for 10.2.2.0/24?

A customer is experiencing packet loss during congestion on a link. The service provider wants to implement a QoS policy that drops less important traffic before more important traffic. Which queuing mechanism is best suited?

A service provider is configuring VRF-lite between two CE routers connected to the same PE. The CE routers are in different VRFs. Which command allows the PE router to forward traffic between the VRFs?

A service provider is deploying MPLS L3VPN and wants to ensure that routes from a specific customer VRF are only advertised to a specific remote PE. Which mechanism should be used?

In a Segment Routing network with TI-LFA enabled, which mechanism prevents micro-loops during a link failure?

A service provider is implementing QoS on a PE router for customer traffic. Which tool should be used to classify traffic based on application layer information?

Which multicast RP model is recommended for large-scale networks to provide redundancy and load sharing?

A service provider is migrating from LDP to Segment Routing. What is the correct order of operations to ensure uninterrupted MPLS forwarding?

In EVPN multihoming with all-active mode, what is the purpose of the aliasing capability?

A service provider is using LISP to provide host mobility. Which LISP component is responsible for storing the mapping of EID to RLOC?

Refer to the exhibit. A PE router has this BGP configuration. The CE router is advertising a default route via eBGP. However, the PE is not installing the route in the VRF table. What is the most likely cause?

A service provider is configuring BGP community propagation in an MPLS VPN network. Which two actions are necessary to ensure that communities are passed from CE to remote PE?

Which two of the following are characteristics of MPLS Traffic Engineering that differentiate it from pure MPLS forwarding?

Which three of the following are valid methods for protecting a pseudowire in an MPLS network?

A service provider operates a Layer 2 MPLS VPN using VPLS. Recently, two new CE routers were added to the VPLS domain, but they cannot ping each other. The existing CEs can communicate. The network uses BGP autodiscovery and signaling. The new CEs are connected to different PEs. The 'show vfi status' command on the new PEs indicates the VFI is up but the pseudowire to the remote PE is down. The BGP session between the PEs is established and the L2VPN address family routes are exchanged. What is the most probable cause?

A customer's MPLS L3VPN has two CE routers connected to two different PEs, but the PEs are not receiving the customer's routes from each other. The PE-CE routing protocol is OSPF. The PEs have the VRF configured with OSPF process, and the routes from CE are in the VRF routing table. The MP-BGP session between PEs is up and the VPNv4 address family is working. On the source PE, the routes show as not advertised to BGP. What is the likely issue?

A service provider is deploying IGMPv3 snooping on an MVPN network to optimize multicast forwarding. After configuration, multicast traffic is not reaching receivers. The source is sending to group 239.1.1.1. The PE router has received the IGMP report from the receiver, and the MDT is established. What is the most likely reason?

Which THREE factors must be considered when deploying MPLS Layer 3 VPN services to ensure optimal scalability and convergence?

A service provider recently deployed MPLS L3VPN for a customer with four sites (Site1, Site2, Site3, Site4) connected to PE1, PE2, PE3, and PE4 respectively. All sites are in VRF CUST-A with route targets 100:1 import and 100:1 export on all PEs. The customer reports that Site4 cannot ping the loopback interface (10.1.1.1/32) of Site1, but Site2 and Site3 can reach it. The provider verifies that BGP sessions between all PEs and the route reflector are up and that VPNv4 routes are advertised. The VRF on PE4 shows the route 10.1.1.1/32 with next-hop 192.0.2.1 (PE1's loopback) but when Site4 initiates a ping, it fails. What should the provider check next?

A large service provider is migrating its L2VPN services (VPWS and VPLS) to EVPN-based solutions to improve scalability and support multi-homing. During the rollout for a customer using VLAN-based EVPN for a data center interconnect, the operations team notices frequent MAC address flapping and broadcast storms on one of the attachment circuits connected to a PE router. The PE is configured for EVPN-MPLS with ESI multihoming using all-active mode. The customer has two PEs (PE1 and PE2) connected to the same CE via two separate Ethernet links. The MAC table on PE1 shows the same MAC address alternating between the local AC interface and the remote EVPN peers. What is the most likely cause and the correct action to resolve this issue?

Which two statements about MPLS Layer 3 VPN route target (RT) communities are correct?

Given the output, which configuration mismatch would prevent a remote PE in the same VPN from installing this route into its VRF?

An ISP operates an MPLS Layer 3 VPN backbone. A customer, Corporation X, has four sites (A, B, C, D) each connected to a different PE router (PE-A, PE-B, PE-C, PE-D). They use OSPF as the CE-PE routing protocol. Sites A, B, and C can exchange routes without issue. However, Site D suddenly loses connectivity to Site B, though it can still reach Sites A and C. Show commands on PE-D reveal that the VRF for Corporation X imports RT:100:200, and the route for Site B (prefix 10.10.20.0/24) is present in the BGP VPNv4 table with RT:100:200 and next-hop 10.0.2.2. The OSPF neighbor between PE-D and the CE at Site D is up, and no route filters are configured. ‘ping 10.10.20.0’ from PE-D fails. What is the most likely cause of the issue?