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問題 #81
(Full question statement start from here)
Refer to the exhibit.
You run the command diagnose switch-controller switch-info loopguard access-1 and see that theMAC- Movecolumn displays a value of0forport1.
What does this indicate? (Choose one answer)
答案：A
解題說明：
In FortiSwitchOS 7.6,Loop Guardis a Layer 2 loop detection mechanism primarily designed to protect access ports from unintended network loops. In itsoriginal implementation, Loop Guard only detected loops on thenative VLAN, which limited its effectiveness in environments using multiple tagged VLANs. To address this limitation, Fortinet enhanced Loop Guard by introducing theMAC move detection feature, as documented in the FortiSwitchOS 7.6 Administrator Guide.
TheMAC move optioninstructs the FortiSwitch to monitor for repeated MAC address flapping events across ports or VLANs. Such MAC movement is a strong indicator of a Layer 2 loop. However, this enhanced detection mechanism isdisabled by defaultand must be explicitly enabled by configuring aMAC move threshold greater than zero.
According to the FortiSwitchOS 7.6 Administrator Guide (page 164), enabling MAC move allows Loop Guard to detect loops beyond the native VLAN. Furthermore, the guide explicitly states (page 166) thata MAC-Move value of 0 indicates that the MAC move feature is not enabled. This means the switch is not monitoring MAC address movement as part of its loop detection logic, even though Loop Guard itself may still be enabled on the port.
Therefore, a MAC-Move value of 0 does not indicate that Loop Guard is disabled or inactive, nor does it imply VLAN-wide port shutdown behavior. It strictly confirms thatMAC move detection has not been enabled, makingOption Cthe correct and fully verified answer based on FortiSwitchOS 7.6 documentation.
問題 #82
You are deploying a new FortiSwitch device in a branch office and you want it to be automatically detected and managed by FortiGate. Which FortiSwitch feature enables automatic detection during deployment?
(Choose one answer)
答案：C
解題說明：
According to theFortiOS 7.6 Study Guideand theFortiSwitch 7.6 FortiLink Guide, the automatic discovery and subsequent management of a FortiSwitch by a FortiGate controller is primarily facilitated by theLink Layer Discovery Protocol (LLDP). LLDP is an industry-standard, layer-2 protocol that allows network devices to advertise their identities and capabilities to neighbors on the same physical link.
When a factory-default FortiSwitch is connected to a FortiGate port (specifically one configured as a FortiLink interface), the switch automatically sends outLLDP advertisements. These advertisements include specificOrganizationally Specific TLVs (Type-Length-Values)that identify the device as a FortiSwitch and provide its management MAC address and current state. The FortiGate "listens" for these LLDP frames; once it receives a frame from a compatible FortiSwitch, it automatically lists the switch in theManaged FortiSwitchinventory as a "discovered" device awaiting authorization.
WhileZero-touch deployment (Option A)describes the overall goal of deploying a switch without manual CLI configuration, it is the underlyingLLDPprotocol that provides the technical mechanism for the initial detection. Once the switch is discovered via LLDP and authorized, the FortiGate uses a DHCP server on the FortiLink interface to assign an IP address to the switch and establishes a secureCAPWAP(Control and Provisioning of Wireless Access Points) tunnel for management. TheFortiLink heartbeat (Option D)is a secondary mechanism usedafterthe connection is established to monitor the health and status of the link, rather than for the initial detection of the device.
問題 #83
Which Ethernet frame can create Layer 2 flooding due to all bytes on the destination MAC address being set to all FF?
答案：B
解題說明：
Layer 2 flooding caused by Ethernet frames with all bytes in the destination MAC address set to FF refers to broadcast frames.Here's why:
* Broadcast Ethernet Frame (A):
* Address Specification:In Ethernet networking, a broadcast frame has a destination MAC address ofFF:FF:FF:FF:FF:FF, which instructs network devices to forward the frame to all devices within the broadcast domain.
* Network Behavior:This causes Layer 2 flooding as the frame is sent to all ports in the VLAN, except the originating port, ensuring that the broadcast reaches all network segments.
* Other Frame Types:
* Unicast (B)targets a single device.
* Multicast (C)targets a group of devices.
* Anycast (D)is not used in Ethernet but rather in IP-based routing to route to the nearest of multiple destinations, typically in internet addressing.
References:You can find more information about Ethernet frame types in networking textbooks or documentation that discusses network layer interaction:Network Theory Books
問題 #84
(Full question statement start from here)
You enable Dynamic Host Configuration Protocol (DHCP) snooping on a VLAN and configure a FortiSwitch port astrustedfor DHCP snooping. What additional step is required to configure the port as trusted for Dynamic ARP Inspection (DAI)? (Choose one answer)
答案：B
問題 #85
Refer to the exhibit.
Two routes in the routing monitor are marked as available but are not installed in the forwarding information base (FIB). Which statement correctly explains why the routes have this status? (Choose one answer)
答案：B
解題說明：
According to theFortiSwitchOS 7.6 Administration Guideand theFortiSwitch 7.6 Study Guide, the Routing Monitor provides a comprehensive view of the Routing Information Base (RIB), which includes all routes learned via static configuration or dynamic protocols (OSPF, BGP, etc.). However, not every route present in the RIB is active for traffic forwarding. The switch must select the "best" path for any given destination to be installed into theForwarding Information Base (FIB).
The provided exhibit shows a routing table with multiple sources for the same destination. Specifically, there is aStaticdefault route ($0.0.0.0/0$) with an administrative distance of 220, and anOSPFdefault route ($0.0.0.0/0$) with an administrative distance of 110. In FortiSwitchOS routing logic, when multiple routes to the exact same destination exist, the system compares theirAdministrative Distance (AD). The route with the lowest AD is considered the most "preferred" or "trustworthy".
In this case, the OSPF route ($AD 110$) is more preferred than the Static route ($AD 220$). Consequently, the OSPF route is marked with a green checkmark in theFIBcolumn, while the Static route-despite being
"Available" in the RIB-is excluded from the FIB. The same logic applies to the $10.0.100.0/30$ subnet, where theConnectedroute is preferred over the OSPF learned route for the same destination. Therefore, the status reflects standard route selection behavior where less-preferred routes remain in the RIB as backups but are not used for active forwarding.
問題 #86
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