300-610 DCID: Designing Cisco Data Center Infrastructure

Answer: B Phantom RP provides redundancy for Bidirectional PIM. It uses a virtual, unassigned RP address and routing-based failover between candidate RPs while preserving the single shared tree rooted at that address. Anycast RP and MSDP are not Bidirectional PIM RP-redundancy mechanisms. **Learn more:** [RP Redundancy with PIM Bidir – Phantom RP](https://community.cisco.com/t5/networking-knowledge-base/rp-redundancy-with-pim-bidir-phantom-rp/tac-p/3117195) · [Bidirectional PIM or Bidirectional Multicast](https://www.cisco.com/c/en/us/td/docs/routers/ncs4200/configuration/guide/mcast/17-1-1/b-imc-multicast-xe-17-1-1-ncs4200/m-bidirectional-pim.html)

Answer: A, D An OOB management network provides a dedicated Layer 3 management path, which supports device monitoring. vPC peer-keepalive messages require Layer 3 connectivity; Cisco NX-OS uses the management ports and management VRF by default when a separate keepalive VRF is not configured. **Learn more:** [Cisco Nexus 9000 Series NX-OS Interfaces Configuration Guide — Configuring vPCs](https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/106x/configuration/interfaces/cisco-nexus-9000-series-nx-os-interfaces-configuration-guide-release-106x/m_configuring_vpcs_9x.html) · [Cisco Nexus Dashboard — Configuring Inband Management and Out-of-Band PnP](https://www.cisco.com/c/en/us/td/docs/dcn/nd/4x/articles-421/configuring-inband-management-and-out-of-band-pnp.html)

Answer: A, B Cisco NX-OS does not support direct communication between VDCs on the same physical device. Connectivity can be provided by routing each VDC through an external Layer 3 device or by making a physical cross-connection between a port allocated to one VDC and a port allocated to the other VDC. **Learn more:** [Cisco Nexus 7000 Series Virtual Device Context Configuration Guide](https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/vdc/config/cisco_nexus7000_vdc_config_guide.pdf)