350-401 · Question #341
Which two southbound interfaces originate from Cisco Catalyst Center (formerly DNA Center) and terminate at fabric underlay switches? (Choose two.)
The correct answer is A. ICMP: Discovery C. TCP 23: Telnet. Explanation Cisco Catalyst Center uses ICMP (ping/discovery) to probe and discover fabric underlay switches within the network, confirming reachability and mapping the topology. It also uses TCP 23 (Telnet) as a legacy southbound management protocol to communicate with and config
Question
Which two southbound interfaces originate from Cisco Catalyst Center (formerly DNA Center) and terminate at fabric underlay switches? (Choose two.)
Options
- AICMP: Discovery
- BUDP 67: DHCP
- CTCP 23: Telnet
- DUDP 6007: NetFlow
- EUDP 162: SNMP
How the community answered
(57 responses)- A93% (53)
- B2% (1)
- D2% (1)
- E4% (2)
Explanation
Explanation
Cisco Catalyst Center uses ICMP (ping/discovery) to probe and discover fabric underlay switches within the network, confirming reachability and mapping the topology. It also uses TCP 23 (Telnet) as a legacy southbound management protocol to communicate with and configure older or underlay network devices that may not support SSH. The distractors are incorrect because UDP 67 (DHCP) flows from client devices toward a DHCP server, not from Catalyst Center to switches; UDP 6007 (NetFlow) travels northbound - from switches toward Catalyst Center for telemetry collection, not the other way around; and UDP 162 (SNMP Trap) also flows northbound from devices to the management platform, not southbound from Catalyst Center to switches.
Memory Tip: Think "Catalyst Center reaches DOWN to devices" - it uses ICMP to find them (discovery/ping) and Telnet (TCP 23) to talk to them (management). Anything that flows from devices to Catalyst Center (NetFlow, SNMP Traps) is northbound - the opposite direction of what the question asks.
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