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350-501Updated 1d ago · Sep 4, 2026

Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR)

513 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 51 questions are free to preview.

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Question 1 · Networking Open

Which task must be completed first when implementing BFD in an IS-IS environment?

Answer: A Baseline BFD session parameters must be configured on the interfaces that will form BFD sessions before IS-IS can use BFD for failure detection. IS-IS BFD may subsequently be enabled globally under the IS-IS process or on selected interfaces. **Learn more:** [Cisco IOS XE 17.x IP Routing Configuration Guide — Bidirectional Forwarding Detection](https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/ip-routing/b-ip-routing/m_irb-bi-fwd-det-0-1.html)
Question 2 · MPLS and Segment Routing Open

Refer to the exhibit. MPLS is configured in the network. The routers use OSPF to exchange routing information. Hosts connected to routers R1 and R3 use routers R2 and R4 to access servers running a variety of intranet applications. A network engineer must ensure that R1 and R3 retain an LDP session between them to support traffic flow between the hosts and servers. Which task should the engineer perform to provide LDP bindings if the path between R1 and R3 fails?

Question exhibit
Answer: A MPLS LDP session protection uses targeted Hellos to maintain the LDP session when a primary link adjacency fails and an alternate IP path remains available. This preserves existing LDP bindings so they do not have to be relearned after the routing path changes. **Learn more:** [Cisco MPLS LDP Session Protection](https://www.cisco.com/en/US/docs/ios-xml/ios/mp_ldp/configuration/15-1mt/mp-ldp-sessn-prot.html)
Question 3 · Networking Open

Refer to the exhibit. A network operator at a private telecommunication company with employee ID `7138: 13:414` has just added users to the network, which resides in VLANs connected to routers R1 and R4. The engineer must now configure the network so that routers R1 and R4 share routes to the VLANs, while routers R2 and R3 are prevented from including those routes in their routing tables. Which configuration must the engineer apply to R4 to begin implementing the request?

Question exhibit
Answer: B An MPLS Layer 2 VPN pseudowire extends a VLAN service between the endpoint routers while the intervening routers forward MPLS-encapsulated traffic and do not install the customer VLAN routes. The attachment interface requires an `xconnect` command specifying the remote peer and virtual-circuit ID, with an MPLS pseudowire class applied to it. **Learn more:** [MPLS Configuration Guide, Cisco IOS XE 17.x — Any Transport over MPLS](https://www.cisco.com/c/en/us/td/docs/routers/ios/config/17-x/mpls/b-mpls/m_mp-any-transport-xe.html)