Architecture

A service provider is designing a new MPLS L3VPN service. The customer requires that their VPN traffic be isolated from other customers and that the provider edge routers maintain separate routing tables for each VPN. Which architectural component is essential for this separation?

An operator notices that a new MPLS-TE tunnel is not being established. The tunnel configuration includes a dynamic path option and a bandwidth of 100 Mbps. The network uses RSVP-TE with CSPF. The link-state database shows sufficient reservable bandwidth on all links along the calculated path. What is the most likely cause of the tunnel establishment failure?

Which network architecture model separates the control plane and data plane in a way that allows for centralized control and distributed forwarding?

In a carrier's network, MPLS-TE tunnels are used to steer traffic away from congested links. The operator configures a tunnel with a bandwidth of 200 Mbps and a dynamic path. The CSPF computation shows a path with sufficient bandwidth, but the tunnel fails to come up. The RSVP neighbor is established. What is the most likely cause?

Which TWO of the following are characteristics of MPLS L3VPN architecture? (Choose two.)

Which TWO of the following are advantages of segment routing over traditional LDP-based MPLS? (Choose two.)

Which THREE of the following are key components of an MPLS L3VPN architecture? (Choose three.)

Refer to the exhibit. A network engineer configures a BGP route-map to set communities on routes advertised to a neighbor. After applying the configuration, the engineer checks the BGP table on the neighbor router and does not see the communities. What is the most likely reason?

Refer to the exhibit. An engineer configures MPLS LDP on a router. The router has two interfaces with IP addresses 10.0.0.1/30 and 10.0.0.5/30. The engineer notices that LDP sessions are not established. The OSPF neighbor adjacencies are up. What is the most likely cause?

A service provider is redesigning its MPLS core to support both L3VPN and L2VPN services. They want to minimize the number of labels in the forwarding table while maintaining per-VRF label allocation. Which label allocation mode should be used for the L3VPN service?

A service provider is deploying Segment Routing over IPv6 (SRv6) and needs to ensure that the forwarding plane can support SRv6 encapsulated packets. Which hardware capability is most critical for SRv6 at the line rate?

A network engineer is troubleshooting an OSPF issue in a service provider network. The network uses OSPFv2 with multiple areas. Routers in area 0 are able to ping each other, but routers in area 1 cannot reach routers in area 2. All routers are OSPF-enabled and have correct network type configurations. What is the most likely cause?

A service provider is implementing MPLS-TE with FRR (Fast Reroute) using one-to-one backup tunnels. After activation, they notice that the number of labels in the forwarding table has increased significantly. What is the most likely reason for this increase?

Which TWO statements about MPLS label operations in a service provider core are correct? (Choose two.)

Which THREE of the following are required components for implementing MPLS Layer 3 VPN (L3VPN) in a service provider network? (Choose three.)

A service provider is designing a new MPLS core network and needs to choose a routing protocol that supports traffic engineering and fast convergence. Which protocol should be used?

An engineer is configuring QoS on a service provider edge router to prioritize real-time traffic. Which queuing mechanism provides the lowest latency and jitter for voice traffic?

A network engineer needs to design a multicast solution for IPTV distribution across a service provider network. Which protocol is best suited for building a shared distribution tree where the RP is dynamically elected?

A service provider is deploying Segment Routing in the MPLS core using IS-IS. Which extension is required in IS-IS to advertise the prefix-SID?

Drag and drop the steps to configure OSPF on a Cisco IOS router into the correct order.

Match each MPLS VPN technology to its description.

A service provider is deploying MPLS in its core network. The core routers are all configured with LDP. Which label operation does an ingress PE perform on the first packet of a new flow?

A service provider is deploying Segment Routing (SR) with TI-LFA for fast convergence. Which mechanism does TI-LFA use to repair a link failure in a node segment path?

In an MPLS VPN environment, which address family is used to exchange VPNv4 routes between PE routers?

An SP is deploying Inter-AS MPLS VPN option B. Which design characteristic is unique to Option B compared to Option A?

A service provider is designing a core network with IS-IS as the IGP. To support MPLS traffic engineering, which IS-IS extensions are required?

In Segment Routing over IPv6 (SRv6), what is the function of the SRH (Segment Routing Header)?

Which TWO statements about EVPN Route Type 2 (MAC/IP advertisement) are correct?

Which THREE are requirements for deploying MPLS Traffic Engineering with RSVP-TE?

Which TWO are functions of the MPLS data plane?

Refer to the exhibit. The router has an outgoing label of 'Pop' for prefix ***********. What does this imply?

Refer to the exhibit. This JSON policy is used for Segment Routing Traffic Engineering. What is the purpose of the 'color' attribute?

A service provider wants to provide Layer 3 VPN services to customers using MPLS. Which technology is used to distribute VPNv4 routes between PE routers?

A customer is experiencing intermittent packet loss in an MPLS L3VPN network. The PE routers show no errors on interfaces. Which tool can help isolate the issue by showing the complete path a packet takes through the MPLS network?

In Segment Routing, what is the role of the 'Prefix-SID'?

Which protocol is used to exchange label binding information in a classic MPLS network without Segment Routing?

Which three are benefits of using MPLS Layer 3 VPNs over traditional VPNs? (Choose three.)

Which two protocols are commonly used for label exchange in an MPLS network? (Choose two.)

Refer to the exhibit. A PE router is showing a VRF route. What does the [200/0] indicate?

A service provider is deploying Segment Routing Traffic Engineering (SR-TE) with a Path Computation Element (PCE). The PCE fails to compute a path for an SR-TE policy configured with constraint 'avoid nodes in affinity red'. The core network has red affinity assigned to several nodes. Which is the most likely cause?

When deploying IS-IS in a large service provider core, what is the recommended network type on Ethernet interfaces to improve scalability?

An MPLS Traffic Engineering LSP fails to establish. The RSVP signaling shows 'PathErr: Admission Control Failure'. The link has sufficient bandwidth but the headend reports a lack of resources. What is the most likely cause?

A service provider is deploying Segment Routing Traffic Engineering (SR-TE) to optimize traffic flows. Which mechanism is used to steer traffic into an SR-TE policy?

A service provider is designing a BGP-based network. Which TWO are characteristics of BGP within a service provider core?

In IS-IS, which TWO are types of Link State PDUs (LSPs)?

A large ISP is designing a multicast architecture to support IPTV, requiring high availability and minimal traffic convergence. Which RP placement design is most appropriate?

Which encapsulation technology is commonly used in service provider networks to separate subscriber traffic in an Ethernet aggregation network?

A service provider wants to implement Segment Routing in its MPLS core to simplify traffic engineering. What is the primary advantage of Segment Routing over traditional RSVP-TE?

An ISP is deploying EVPN-VXLAN for its data center interconnect. Which statement about control-plane learning is correct?

An engineer needs to ensure that a core router can forward MPLS packets without checking the IP header. Which forwarding mechanism should be enabled?

A service provider is implementing IPv6 transition in its core. Which transition mechanism is recommended for carrying IPv6 over an existing MPLS/IPv4 backbone without dual-stacking all routers?

Which TWO are characteristics of Segment Routing?

Which THREE are benefits of implementing MPLS-TE in a service provider core?

Which TWO are essential components for deploying EVPN in a service provider network?

A service provider is implementing MPLS L3VPN for a customer. The customer requires that routes from two different VPNs be imported into a single VRF. Which feature should be used?

A large SP network uses Segment Routing (SR) with MPLS data plane. They want to enforce a strict path for certain traffic flows across the core while using shortest-path for others. Which technique should be used?

A service provider wants to prioritize voice traffic over data traffic on a PE-CE link. Which QoS mechanism should be applied at the PE ingress to classify packets?

In a multicast environment, a PE router is not receiving multicast traffic from a source behind a CE. The PIM neighbors are established. The RP is reachable. What is the most likely issue?

An SP is deploying EVPN with VXLAN encapsulation in a data center interconnect. The design requires that the control plane for MAC/VTEP learning is based on BGP. Which BGP address family must be configured?

A service provider is experiencing suboptimal routing due to BGP route reflection. To improve path selection while maintaining IBGP scalability, which feature should be implemented?

Refer to the exhibit. A PE router configuration for VRF CUST1 is shown. What is the most likely result when a CE sends a route with RT 100:100?

Refer to the exhibit. An engineer has configured an SR-TE policy. What is required for this policy to be used for traffic steering?

A service provider is deploying EVPN-VPWS for point-to-point services. They have set up an EVPN instance with Ethernet Segment Identifier (ESI) and EVI. After configuration, the pseudowire is not coming up. Which misconfiguration is most likely?

In an IS-IS segment routing network, after the global 'segment-routing mpls' configuration, which IS-IS configuration is mandatory for label allocation?

An SP has configured MPLS TE tunnels for traffic engineering. To verify the status of the TE tunnels, which command provides the most relevant information?

In a carrier network using VRF-lite for customer isolation, which issue arises if route-target values are not correctly configured?

In an SR network, which configuration is required to activate TI-LFA for link protection?

An SP is managing a large MPLS network and needs to verify the MPLS forwarding entries for a specific VRF. Which command provides the most complete information for the VRF?

Which THREE protocols are used for label distribution in an MPLS network?

A service provider offers L3VPN services to multiple enterprise customers. One customer reports that they cannot reach some remote sites intermittently. The network uses MPLS L3VPN with MP-BGP for VPN route exchange. The PE routers are configured with route-target import and export. The customer's CE router is dual-homed to two different PEs in the same point of presence. The engineer checks the BGP table on both PEs and sees the customer routes with the correct route-target. However, pings from the CE to a remote site fail about 50% of the time, and the flapping pattern suggests load balancing issues. The engineer discovers that the remote site's network prefix is being advertised from both PEs with the same route-target but with different next-hops. The CE has equal-cost paths via both PEs. What is the most likely cause of the intermittent connectivity?

A service provider is implementing EVPN for its VPLS replacement. They have configured BGP EVPN on all PEs and have set up an EVPN instance for a customer requiring broadcast, unknown unicast, and multicast (BUM) traffic. The customer reports that broadcast traffic from one site is not being received at another site. The engineer checks the EVPN configuration and finds that the EVI is configured correctly, the route-target matches, and the BGP sessions are established. The engineer also checks the MAC address table on the receiving PE and sees that the source MAC of the broadcast frame is learned on the local interface, but not from the remote VTEP. The engineer suspects an issue with the IMET (Inclusive Multicast Ethernet Tag) route. Which action should the engineer take to verify the IMET route?

A service provider is designing an MPLS L3VPN network to provide Layer 3 VPN services to multiple customers. Which two statements correctly describe the roles of the Provider Edge (PE) and Customer Edge (CE) routers in this architecture?

An SP is migrating its core network to Segment Routing (SR-MPLS). The network uses IS-IS as the IGP with SR extensions. Which three statements about SR-MPLS architecture are correct?

A service provider offers Carrier Ethernet services using MPLS-TP in the access and aggregation layers. The network uses MPLS-TP tunnels with static LSPs and protection via 1:1 linear protection with APS. One customer reports intermittent connectivity issues on their E-LINE service. The operations team observes that the protection switchover is occurring frequently due to apparent signal failures on the working path. However, the physical layer shows no errors. The protection switching is configured with revertive mode. The working LSP has an RDI (Remote Defect Indication) configured. Upon further investigation, the team finds that the working LSP's OAM continuity check messages (CCMs) are being lost occasionally, triggering a protection switch. What is the most likely misconfiguration?

A service provider is building a new network slicing architecture to offer differentiated services to enterprise customers. The architecture uses SRv6 with network slices identified by slice IDs embedded in the SRv6 SID. The underlay is an IP network with ISIS. Each slice will have dedicated resources in the core, including guaranteed bandwidth and low latency. The plan is to use the SRv6 network programming concept to steer traffic into different slices. The provider wants to ensure that slice isolation is maintained end-to-end, including at the egress PE where traffic is handed off to the customer. However, during testing, they observe that traffic from one slice is incorrectly entering another slice's queue on an intermediate node, causing performance interference. The intermediate node is a transit router that does not terminate SRv6 but performs 'SID-based forwarding'. Which mechanism is most likely missing to ensure slice isolation on transit nodes?

A service provider offers IPTV services using multicast. The network uses Multicast VPN (MVPN) with Rosen GRE encapsulation (Profile 1) in an MPLS L3VPN environment. The Provider Edge (PE) routers participate in both the default MDT and data MDT for high-bandwidth streams. Recently, a new channel was added, and it uses a data MDT. The content server is attached to a PE that is acting as a multicast source. Other PEs are receivers. Upon adding the channel, some receivers report missing packets. The network engineer checks the PEs and notices that the data MDT group address is being advertised via BGP as an MDT SAFI route, but some PEs are not joining the data MDT. The source PE's multicast routing table shows that it believes data MDT is active. Which architecture issue is most likely preventing some PEs from joining the data MDT?

A network architect is designing a Segment Routing (SR) network for a service provider with a requirement for fast convergence upon node failure. The network uses IS-IS as the IGP with segment routing extensions. Which design choice BEST ensures that the network can achieve sub-50ms convergence without relying on any signaling protocol beyond the IGP?

A service provider needs to offer L3VPN services to multiple customers, each with overlapping IP addresses. The provider plans to use MPLS VPNs with VRFs. Which statement is TRUE regarding the configuration of VRFs on the PE routers?

A service provider has deployed QoS on its MPLS backbone to offer different classes of service. The provider notices that EF (Expedited Forwarding) traffic sometimes experiences high jitter during congestion. Following recommended practices, which action is MOST likely to reduce jitter for EF traffic?

Based on the exhibit, why is the route 10.10.10.0/24 from remote PE not installed in the VRF Customer-A on PE1?

Which access technology is commonly used in service provider networks to deliver high-speed internet over existing telephone lines?

In IOS XR architecture, what is the role of the Secure Domain Router (SDR)?

A service provider is deploying L3VPN using BGP/MPLS. Which mechanism ensures customer isolation in the provider network?

In IOS XR, what is the commit/rollback configuration model?

A service provider wants to provide point-to-point Ethernet services with strict SLAs. Which technology should they use?

Which MEF service type provides a point-to-point Ethernet connection between two user-network interfaces (UNIs)?

What is the main benefit of using Q-in-Q (802.1ad) in metro Ethernet networks?

In EVPN, what is the function of the Ethernet Segment Identifier (ESI)?

A service provider is deploying network slicing for 5G services. Which slice type is characterized by low latency and high reliability for applications like autonomous driving?

In IOS XR, which process is responsible for managing the configuration database and commit operations?

A service provider is using NSO for service orchestration. Which protocol does NSO use to communicate with network devices for configuration?

Which TWO are characteristics of the access layer in a service provider network? (Choose two.)

Which TWO are benefits of using EVPN over traditional VPLS for L2VPN services? (Choose two.)

Which access technology in a service provider network uses a passive optical splitter to distribute signals to multiple customers, with typical downstream speeds up to 2.5 Gbps?

An SP is deploying MPLS in the core/backbone to support L3VPN services. What is the purpose of MP-BGP in an MPLS VPN architecture?

An SP uses Cisco ASR 9000 routers with IOS XR. Which statement correctly describes the commit/rollback configuration model in IOS XR?

A service provider wants to offer a point-to-point Ethernet service between two customer sites with a defined bandwidth and performance guarantee, according to MEF standards. Which Carrier Ethernet service type is appropriate?

In the context of network slicing for 5G, which type of slice is optimized for massive IoT with low data rates and high connection density?

An SP deploys EVPN to provide L2VPN services with multi-homing. The customer CE is dual-homed to two different PE routers. Which EVPN mechanism ensures that only one PE forwards traffic to the CE for a given Ethernet segment, preventing loops?

Which architecture feature of IOS XR ensures that a failure in one routing protocol process does not affect other processes on the same router?

A service provider needs to offer L3VPN services with customer isolation. Which technology is used to maintain separate routing tables for different customers on a single PE router?

An SP uses Cisco NSO for automation. Which protocol does NSO typically use to push configuration changes to network devices?

What is the primary function of the aggregation layer in a service provider network?

Which MEF Carrier Ethernet service type is used for a rooted-multipoint topology, where a single root site communicates with multiple leaf sites but leaf sites cannot communicate directly?

Which TWO of the following are characteristics of the IOS XR operating system architecture? (Select two.)

Which THREE of the following are benefits of using EVPN over traditional VPLS for L2VPN services? (Select three.)

Which TWO access technologies are considered fiber-based solutions for service provider access networks? (Select two.)

A service provider wants to provide a point-to-point Ethernet service between two customer sites with strict Service Level Agreements (SLAs). Which MEF service type should be used?

In Cisco IOS XR architecture, using Secure Domain Routers (SDRs) allows partitioning a physical router into multiple logical routers. Which statement about admin plane and SDRs is correct?

Which access technology uses a passive optical splitter to deliver broadband services to multiple subscribers over a single fiber?

An SP is deploying EVPN to provide both L2 and L3 VPN services. Which advantage does EVPN offer over traditional VPLS for multi-homing?

In IOS XR, each routing protocol runs as a separate process. What is the primary benefit of this architecture?

Which MEF service type is used for multipoint-to-multipoint Ethernet connectivity, such as a corporate LAN extension across multiple sites?

A service provider is implementing network slicing for 5G services. Which of the following is NOT a typical characteristic of a network slice?

In the context of IOS XR commit/rollback configuration model, which command is used to apply a set of configuration changes as a single atomic operation?

Which Cisco automation tool is designed for service modeling with YANG and provides lifecycle management of network services?

In BGP/MPLS IP VPN (L3VPN), which component provides customer isolation by maintaining separate routing tables per customer?

An SP is designing a metro Ethernet network using Q-in-Q. A customer uses VLAN ID 100 on their network, and the SP assigns service VLAN 200. Which frame format is used on the SP network?

Which Cisco SP router platform uses IOS XR and is commonly deployed at the aggregation layer, supporting both L2 and L3 services?

Which access technology is based on ITU-T G.984 and provides downstream speeds up to 2.488 Gbps?

Which TWO of the following are benefits of using EVPN over traditional VPLS for L2VPN services?

An SP is planning to offer L3VPN services. Which TWO components are essential for BGP/MPLS IP VPN operation?

Which TWO of the following are disadvantages of using VPLS for L2VPN services compared to EVPN?

A service provider wants to deploy network slicing for 5G services. Which THREE of the following are typical requirements for network slicing?

A service provider wants to offer a point-to-point Layer 2 Ethernet service between two customer sites with strict SLAs. The solution must use MPLS pseudowires. Which MEF service type aligns with this requirement?

A service provider is implementing EVPN to support multi-homing for a customer site. Which EVPN attribute ensures that only one of the PEs forwards traffic for a given Ethernet segment?

An ISP wants to create separate virtual networks over a shared physical infrastructure to serve mobile broadband (eMBB), IoT (mMTC), and mission-critical services (uRLLC). Which technology enables this segmentation with per-slice resource guarantees?

Which Cisco automation tool uses service models in YANG and communicates via NETCONF to orchestrate device configurations and lifecycle management?

In a BGP/MPLS IP VPN, which technique ensures that customer traffic from different VPNs remains isolated on the same PE router?

A metro Ethernet provider needs to scale customer VLANs beyond the 4,096 limit by encapsulating customer VLAN tags with an outer service provider tag. Which IEEE standard is used?

Which statement about the commit/rollback configuration model in IOS XR is true?

Which technology provides Layer 2 multipoint connectivity over an MPLS network, where customer sites appear to be on the same Ethernet broadcast domain?

Which Cisco router platform is designed for the aggregation layer and runs IOS XR, supporting both L2 and L3 services at high density?

In an IOS XR system, CPU and memory resources are allocated per line card. What is the primary reason for this design?

Which THREE are benefits of using EVPN over traditional VPLS? (Choose three.)

Which TWO are key features of IOS XR architecture? (Choose two.)

Which THREE are MEF-defined Ethernet service types? (Choose three.)

A service provider is deploying a new metro Ethernet network and needs to support multiple customer VLANs over a single physical link without overlapping VLAN IDs. Which technology should be used at the access layer to achieve this?

A provider is implementing EVPN for data center interconnect. They require multi-homing with all-active load balancing and fast convergence using BGP. Which EVPN feature enables this?

A service provider wants to automate service provisioning using NSO. Which protocol is typically used by NSO to configure network devices?

Which MPLS-based service provides point-to-point Ethernet connectivity over a service provider network, emulating a wire?

A service provider is migrating from LDP to Segment Routing (SR) in the core. They need to support MPLS forwarding without maintaining LDP sessions. Which SR data plane is appropriate?

What is the function of the admin plane in IOS XR architecture?

Which MEF service type provides a multipoint-to-multipoint Ethernet virtual connection?

In an MPLS core, which forwarding mechanism do P routers use to forward packets for L3VPN?

Which TWO statements about IOS XR architecture are correct? (Choose two.)

Which THREE are characteristics of EVPN? (Choose three.)

Which TWO are correct about network slicing? (Choose two.)

In a service provider network, the access layer connects end customers. Which technology is commonly used for fibre-based access in GPON deployments?

In IOS XR architecture, what is the purpose of Secure Domain Router (SDR)?

Which MPLS-based service provides point-to-point Ethernet connectivity over a service provider network, also known as a pseudowire?

A service provider wants to offer a service where a customer site can communicate with multiple other sites in a full mesh over MPLS. Which L2VPN technology is most appropriate?

In IOS XR, what is the primary purpose of the commit/rollback configuration model?

Which MEF service type defines a point-to-point Ethernet connection, often used for business connectivity?

In EVPN, what is the purpose of Ethernet Segment Identifier (ESI)?

What is the role of Network Services Orchestrator (NSO) in service provider automation?

In a Cisco IOS XR router, which statement best describes process separation?

A service provider is designing a network to support mobile backhaul for eMBB, uRLLC, and mMTC services. Which technology allows the physical network to be divided into virtual networks with dedicated resources for each service type?

A service provider runs IS-IS Level 2 as its IGP in a core of Cisco ASR 9000 routers running IOS XR. The provider wants to enable Segment Routing using MPLS with a Segment Routing Global Block (SRGB) of 16000-23999. Which configuration is required on each core router to enable SR-MPLS with the default behavior?

A service provider is designing a large-scale Layer 3 VPN service and wants to avoid running a separate routing protocol instance for every customer on the PE routers. The design team decides to use a single BGP autonomous system across the entire provider core and edge. Which architecture feature allows the PE routers to keep customer routes separate while sharing one BGP process?

A service provider runs IS-IS Level 2 across its core with Cisco ASR 9000 routers. An engineer notices that the link-state database for the Level 2 topology keeps growing because thousands of external prefixes from a redistribution point are being flooded throughout the entire domain. The provider wants to confine these redistributed prefixes so core routers outside a specific area do not carry them in their LSDB. Which IS-IS feature should be configured on the boundary router?

A service provider is deploying a Segment Routing over MPLS (SR-MPLS) core. The design requires that a router forwarding an MPLS packet with a segment list must be able to identify the top segment without inspecting the IP header. Which field in the MPLS label stack is used to carry the segment identifier?

A service provider is designing a large-scale BGP-free core using Segment Routing over an MPLS data plane with Cisco IOS XR. The design team wants PE routers to reach remote PE loopbacks using only SR labels carried in the IGP, without running iBGP between P routers. Which architecture component makes this possible?

A service provider is designing a large-scale MPLS L3VPN network using Cisco IOS XR routers. The network architect wants to eliminate the need for a separate IGP+LDP deployment on the core-facing interfaces and instead use a single protocol that distributes both IGP reachability and MPLS labels. Which technology should be used to achieve this goal?

A service provider is deploying a large-scale MPLS L3VPN service. The network architect wants to reduce the number of BGP sessions on each PE router while ensuring that all PEs can exchange VPNv4 routes. Which BGP scaling technique should be used?

A service provider offers a Layer 3 VPN to an enterprise. The customer edge router at one site sends the same prefix to two different PE routers, and the provider wants the PE to accept only the path with the higher BGP local preference while still receiving both copies. Which BGP behavior should the provider rely on at the receiving PE?

A service provider runs an IOS XR core where a single route processor (RP) failure must not interrupt forwarding or routing protocol adjacencies on the line cards. The design team wants to confirm which IOS XR architecture component is responsible for continuing to forward traffic and maintaining protocol state when the active RP fails and the standby RP takes over. Which component provides this capability?

A service provider runs an MPLS L3VPN over an SR-MPLS core. The operator wants to ensure that customer traffic follows a specific path that avoids a congested link, without using RSVP-TE. Which mechanism should be used to steer the traffic?

A service provider is deploying MPLS L3VPN over Cisco IOS XR and must ensure the VPNv4 control plane scales across many PEs. The design team is reviewing how route targets and route distinguishers interact. Which two statements correctly describe their roles? (Choose two.)

An engineer is designing an MPLS L3VPN where the provider edge routers must exchange VPNv4 prefixes. The customer requires that the PE routers use a single BGP session to carry both IPv4 unicast and VPNv4 routes, while ensuring that the IPv4 unicast routes are not imported into any VRF. Which BGP address family configuration on IOS XR accomplishes this?

A service provider is using Cisco IOS XR and wants to implement a routing policy that sets the BGP community attribute on routes learned from a specific neighbor. The policy should also prepend the AS path three times for those routes. Which configuration correctly applies this policy?

A service provider is implementing MPLS L3VPN on Cisco IOS XR routers. The network engineer must configure the PE routers to support overlapping customer address spaces and control route distribution between VRFs. Which two statements about the MPLS L3VPN control plane are correct? (Choose two.)

A service provider wants to synchronize clocks across its core routers so that timing accuracy supports one-way delay measurements and strict SLA reporting. The engineer must choose a synchronization technology that delivers sub-microsecond accuracy and is designed for packet networks. Which technology should be selected?

A service provider is migrating its core to Segment Routing over an MPLS data plane using IS-IS. The design requires that SR-enabled routers advertise their globally unique SID and that the IGP computes shortest-path forwarding to each prefix-SID without additional signaling. Which TWO statements about this deployment are correct? (Choose two.)

A service provider is using Cisco IOS XR routers in its core. The network operations team requires that configuration changes be validated before committing to the running configuration, and that they be able to roll back to a previous configuration state if a change causes issues. Which IOS XR feature should be used to meet these requirements?

A service provider wants to provide a Layer 2 VPN service that transparently carries customer Ethernet frames, including customer VLAN tags, across an MPLS core. The provider wants to use a point-to-point pseudowire between two PE routers. Which technology should be deployed to meet this requirement?

A service provider uses BGP on IOS XR routers to exchange routes with customers. An engineer notices that a customer is advertising a prefix with an unexpected AS_PATH that includes the provider's own AS number, which the provider's inbound policy does not filter. The provider wants to prevent its own AS from appearing in routes learned from customers without disrupting legitimate customer routes. Which BGP feature should be applied on the customer-facing sessions?

A service provider runs Cisco IOS XR on its core routers and wants to ensure high availability by separating control plane and data plane processes. The SP is concerned about a routing protocol process failure affecting packet forwarding. Which IOS XR architectural feature best addresses this concern?

A service provider is deploying a large-scale MPLS network with Cisco ASR 9000 routers running IOS XR. The network operations team wants to ensure that a software defect in a single routing protocol process does not cause the entire router to reload. Which IOS XR architecture feature addresses this requirement?

A service provider is deploying a new core network using Cisco IOS XR. The network operations team wants to ensure that a configuration change on a router can be automatically rolled back if the router loses connectivity during the commit. Which IOS XR feature should be used?

A service provider is deploying a new MPLS network and needs to exchange labels between adjacent routers. The network uses Cisco IOS XR routers. Which protocol is specifically designed for label distribution in MPLS and is commonly used in service provider core networks?

A service provider is deploying Segment Routing over MPLS (SR-MPLS) in its core network. The design team must ensure that the network can quickly recover from link failures using TI-LFA (Topology Independent Loop-Free Alternate). Which two statements about TI-LFA in an SR-MPLS environment are correct? (Choose two.)

A service provider is designing a Segment Routing over MPLS (SR-MPLS) core. The network architect wants to ensure that the IGP only advertises the loopback prefix with a prefix SID, and that other prefixes do not consume SID space. Which mechanism should be used?

A service provider is implementing QoS in its MPLS network using Cisco IOS XR. The provider wants to classify and mark traffic at the edge and then use the MPLS Experimental (EXP) bits to carry QoS information across the core. Which two statements about MPLS EXP bits are correct? (Choose two.)

A service provider is using Cisco IOS XR and wants to implement a solution to prevent routing loops in an MPLS VPN environment where customers use overlapping IP address spaces. Which mechanism should be used to ensure that packets from one VPN are not forwarded into another VPN?

A service provider is deploying a Segment Routing (SR) solution using Cisco IOS XR. The SP wants to minimize the number of labels in the MPLS stack while still providing traffic engineering capabilities. Which SR component allows a headend router to steer traffic through a specific path without relying on RSVP-TE?

A service provider is deploying a BGP-free core using Segment Routing. The provider wants to enable TI-LFA for fast reroute. Which statement correctly describes how TI-LFA provides backup paths?

A service provider is implementing MPLS L3VPN on Cisco IOS XR routers. The SP wants to ensure proper route distribution and forwarding. Which two statements about MPLS L3VPN operation are correct? (Choose two.)

A service provider is designing a large-scale BGP-free core using Segment Routing over MPLS. The core routers are Cisco ASR 9000 running IOS XR, and they must forward labeled packets without carrying any customer or external BGP routes. The design requires that the ingress PE impose a label stack that steers traffic to the egress PE, while the core routers only perform label swapping based on the top label. Which Segment Routing component is responsible for distributing the prefix SIDs that enable this forwarding?

A service provider is deploying an MPLS L3VPN service for a customer that requires strict traffic isolation and the ability to use overlapping IP addresses across different VPNs. The PE routers are Cisco ASR 9000 running IOS XR. The design team must choose the correct control-plane mechanism to exchange customer routes between PEs while maintaining isolation. Which combination of BGP address family and route distinguisher usage is required?

A service provider is using Cisco IOS XR on ASR 9000 routers. An engineer needs to apply a configuration change that affects BGP routing policy. The change must be tested and, if it causes a problem, reverted to the previous committed configuration without reloading the router. Which IOS XR feature supports this operational model?