Let’s verify each protocol:
C. FortiGate uses the FortiLink protocol to establish communication with FortiSwitch.✔
FortiLink is themanagement and control protocol, encapsulated over:
LLDPfor discovery
CAPWAP (UDP/5246–5247)for control channel
DHB (Device Handshake Bus)inside CAPWAP frames
Thus,FortiLink is required.
D. CAPWAP is used to establish the control channel between FortiSwitch and FortiGate.✔
Although CAPWAP is commonly associated with FortiAP, FortiSwitchalso uses CAPWAPinternally when managed by FortiGate.
This is documented in:
FortiSwitch Administration Guide
LAN Edge deployment guide
SoD is correct.
B. UHTTPS is used by FortiGate to securely manage and configure FortiSwitch devices.✔
FortiLink session actually uses:
Encrypted CAPWAP (over DTLS)
UHTTPS (port 4433)for secure configuration exchanges
This protocol is mandatory for:
ThereforeUHTTPS is indeed one of the key protocols.
Why the incorrect options are wrong:
A. SNMP can be used by FortiGate to manage FortiSwitch.✖
FortiGate doesnotuse SNMP to manage FortiSwitch.
SNMP is for monitoring by external systems, not for FortiLink control.
E. IGMP is required for management.✖
IGMP is a multicast protocol, irrelevant for FortiGate–FortiSwitch management.
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