These are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam.
Start Scenario PracticeA service provider is implementing 6VPE to provide IPv6 L3VPN services. Which two statements about 6VPE are true?
Explanation: 6VPE uses MP-BGP extensions with AFI 2 (IPv6) and SAFI 128 (MPLS-labeled VPN address family) to exchange VPN-IPv6 routes. It supports overlapping IPv6 address spaces between different VPNs by using route distinguishers. PE routers do not require IPv6 connectivity to the MPLS core; the core can be IPv4-only with MPLS. 6VPE does not require a full IPv6 routing table on the PE, and it uses MPLS encapsulation, not GRE.
Which three of the following are valid methods for protecting a pseudowire in an MPLS network?
Explanation: Multi-segment PW (MS-PW) with backup is a valid protection method because it allows a pseudowire to be established across multiple MPLS segments, with a backup PW path that can take over if the primary MS-PW fails. This provides end-to-end pseudowire redundancy by using a secondary switched path, ensuring service continuity in multi-domain or multi-area MPLS networks.
During a network migration from EIGRP to OSPF, you notice that some routes are being redistributed incorrectly, causing routing loops. The OSPF domain uses area 0 and area 1. The EIGRP domain uses AS 100. Which configuration change would best prevent loops during the migration?
Explanation: Route-maps allow you to tag redistributed EIGRP routes with a specific tag value (e.g., 'tag 100') and then filter those tagged routes on OSPF routers using a distribute-list in or prefix-list combined with the route-map. This prevents the redistributed routes from being re-injected back into EIGRP, breaking the redistribution loop. Without such tagging and filtering, mutual redistribution between EIGRP and OSPF can cause routing loops due to the two-way redistribution of routes.
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?
Explanation: Ethernet Segment Identifier (ESI) and designated forwarder (DF) election in EVPN ensure that only one PE forwards traffic to the CE for a given Ethernet segment, preventing loops.
A network operator is deploying segment routing in an MPLS network. They want to use a centralized controller to compute paths based on traffic demand and network constraints. Which architecture is being used?
Explanation: The scenario describes a centralized controller computing paths based on traffic demand and network constraints, which is the definition of a Path Computation Element (PCE) architecture. In Segment Routing, the SR-PCE (Segment Routing Path Computation Element) is the centralized controller that calculates optimal paths using traffic engineering constraints and then communicates the path information (via PCEP) to the headend router. This is distinct from distributed control plane approaches like LDP or SR-BE, and from SR-TE which is the overall traffic engineering mechanism but not the specific centralized controller architecture.
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Practice all Hard Difficulty QuestionsThese are the questions most candidates get wrong. They require connecting multiple concepts, reading tricky output, or knowing edge-case behaviour that isn't on most study cards. Practising them trains you to operate under uncertainty — a necessary skill on the real exam. These appear throughout the 350-501 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 350-501. Practicing each scenario type ensures you're ready for any format.
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