Exam 350-801 topic 1 question 54 discussion

The correct answer is B; Intercluster Lookup Service. Intra-Cluster Communication Signaling (ICCS) is used for the propagation and replication of run-time data such as registration of devices, locations bandwidth, and shared media resources.

Use global dial plan replication to create a global dial plan that spans across the Intercluster Lookup Service (ILS) network. When you enable Global DialPlan Replication, you configure the dial plan component on one cluster, and ILS replicates that information throughout the ILS network. Use global dial plan replication to create a global dial plan that spans across the Intercluster Lookup Service (ILS) network. When you enable Global DialPlan Replication, you configure the dial plan component on one cluster, and ILS replicates that information throughout the ILS network. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/11_0_1/sysConfig/CUCM_BK_C733E983_00_cucm-system-configuration-guide-1101/cucm_mp_c9dc8050_00_configure-global-dial-plan-replication.pdf

Learned global dial plan data is the GDPR data learned through ILS networking. Every CUCM cluster keeps a local database of the learned (and local) data. Implementing Cisco IP Telephony and Video, Part 2 (CIPTV2) Foundation Learning Guide Chapter 15: Cisco Inter-Cluster Lookup Service (ILS) and Global Dial Plan Replication (GDPR)

Answer is B

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU3/systemConfig/cucm_b_system-configuration-guide-1251su3/cucm_m_intercluster-lookup-service.html