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| Section | Objectives |
|---|---|
| Monitoring and troubleshooting | - Use packet capturing methods to monitor and troubleshoot traffic issues - Use tools to view and extract network information from FortiSwitch - Troubleshoot FortiLink issues - Interpret system logs, monitor port statistics, and diagnose connectivity issues |
| Layer 2 control and security | - Use ACLs, security profiles, and VLAN security mechanisms on FortiSwitch - Use port security options on FortiSwitch - Use filtering and antispoofing techniques on FortiSwitch |
| Deployment and management | - Deploy and configure FortiSwitch in a multi-tenancy environment - Configure and provision FortiSwitch - Deploy FortiSwitch supported deployment topologies |
| FortiSwitch concepts | - Configure switch ports, split port, and available transceivers - Configure VLANs using FortiSwitch - Configure the ports required for stack deployment - Configure STP to prevent network loops - Use QoS and LLDP-MED on FortiSwitch - Configure switching and routing on FortiSwitch |
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NEW QUESTION # 39
Refer to the exhibits.
All three FortiSwitch-connected ports are configured in VLAN 10. FortiGate acts as the Dynamic Host Configuration Protocol (DHCP) server and is connected to a DHCP snooping trusted trunk port. PC1 and PC2 are connected to ports configured as untrusted for Dynamic ARP Inspection (DAI), and no static bindings are configured in the IP source guard (IPSG) database. PC2 is compromised and attempts to spoof the FortiGate IP address by sending forged Address Resolution Protocol (ARP) replies with its own MAC address. What will FortiSwitch do with the ARP packets from PC2? (Choose one answer)
Answer: D
Explanation:
According to theFortiSwitchOS 7.6 Administration Guideand theFortiSwitch 7.6 Study Guide, Dynamic ARP Inspection (DAI) is a security feature used to intercept, log, and discard ARP packets with invalid IP-to-MAC address bindings. DAI is primarily used to prevent " Man-in-the-Middle " attacks, such as ARP spoofing or ARP cache poisoning.
In this scenario, DAI is active on VLAN 10. When DAI is enabled, the FortiSwitch intercepts all ARP packets on untrusted ports and validates them against a trusted source-most commonly theDHCP snooping database.
As shown in the " DHCP Snooping database " exhibit, PC2 is correctly mapped to IP 10.0.10.30 and MAC 00:
09:0F:AB:00:0B.
When PC2 attempts to send a forged ARP reply claiming that IP 10.0.10.254 (the FortiGate ' s IP) is located at its own MAC address (00:09:0F:AB:00:0B), the FortiSwitch ' s DAI engine inspects the packet. It checks the DHCP snooping database for a binding that matches IP 10.0.10.254 to MAC 00:09:0F:AB:00:0B. Finding no such valid entry (because the database correctly identifies the MAC 00:09:0F:AB:00:0B as belonging to IP
10.0.10.30), the switch identifies the ARP packet as illegitimate.
Consequently, the FortiSwitch willdrop the ARP repliesbecause they fail the DAI validation check against the established DHCP snooping bindings. Option A is incorrect as DAI functions independently of IPSG once the database is populated. Option B is incorrect because " accepting " the spoofed packet is the opposite of DAI ' s purpose. Option C is incorrect because DAI is specifically designed to run on untrusted ports to protect the network from client-side attacks.
NEW QUESTION # 40
You are configuring FortiSwitch to perform layer 3 inter-VLAN routing while managed by FortiGate over FortiLink. On supported hardware models, FortiSwitch can offload routing decisions for better performance.
1How does FortiSwitch perform routing between VLANs? (Choose one answer)
Answer: A
Explanation:
According to theFortiSwitchOS 7.6 FortiLink Guideand theFortiSwitch 7.6 Study Guide, managed FortiSwitch units support a feature calledInter-VLAN Routing Offload. Traditionally, in a FortiLink deployment, traffic between VLANs is "hair-pinned" back to the FortiGate for routing and security inspection. However, to increase performance and reduce latency, the FortiGate can program the managed FortiSwitch to handle Layer 3 routing of trusted traffic locally.
The technical mechanism behind this performance gain is the use of theForwarding Information Base (FIB) programmed directly into the switch'sASIC (Application-Specific Integrated Circuit). When routing offload is enabled (specifically using the set switch-controller-offload enable command on the VLAN interface), the FortiGate pushes the necessary routing table and gateway information to the switch hardware.
This allows the FortiSwitch to perform packet lookups and forwarding decisions at wire speed within the silicon, bypassing the general-purpose CPU and the FortiLink control plane for that specific traffic flow.
The documentation notes that this feature requires anAdvanced Features Licenseon the tier-1 FortiSwitch and is typically applied to the switch closest to the FortiGate.2While dynamic routing (Option B) is supported on FortiSwitch, it is not theonlything offloaded; static routes and inter-VLAN gateway traffic are the primary use cases for this offload mechanism. Therefore, the correct architectural description is that the switch utilizes its hardware-based FIB to accelerate inter-VLAN communication.
NEW QUESTION # 41
Exhibit.
Two routes are not installed in the forwarding information base (FIB) as shown in the exnibit. Which two statements about these two route entries are true? (Choose two.)
Answer: B,C
Explanation:
From the exhibit and the details given about the routes not installed in the FIB:
* These two routes have a higher administrative distance value available to the destination networks (Option A): Administrative distance is a measure used by routers to select the best path when there are two or more different routes to the same destination from two different routing protocols. A higher administrative distance means that the route is considered less trustworthy, thus not selected for the FIB unless the more preferred routes fail.
* These two routes will become primary, if the best routes are removed (Option B): In routing, if the currently installed routes (which are considered the best due to reasons like lower administrative distance) are removed or become unavailable, the next best routes based on administrative distance will be used. This behavior ensures redundancy and maintains network connectivity in diverse scenarios.
References:
This approach is aligned with standard routing protocol behavior as documented in networking protocols and Fortinet's routing mechanisms which prioritize routes based on administrative distance and other metrics to maintain efficient and reliable network routing.
NEW QUESTION # 42
Which Ethernet frame can create Layer 2 flooding due to all bytes on the destination MAC address being set to all FF?
Answer: C
Explanation:
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
NEW QUESTION # 43
Refer to the exhibit.
You just connected three FortiSwitch devices:Core-1,Core-2, andAccess-1. Core-1 and Core-2 both connect to Access-1 for redundancy. All switches are managed by FortiGate, which uses port4 as the FortiLink interface. After you enable the uplink ports on Core-2, you notice that port3 on Access-1 enters the Discarding STP state. What is the most likely cause of this behavior? (Choose one answer)
Answer: B
Explanation:
According to theFortiSwitchOS 7.6 Administration Guideand theFortiLink 7.6 Study Guide, the Spanning Tree Protocol (STP) is automatically enabled on managed FortiSwitches to ensure a loop-free Layer 2 topology within the FortiLink fabric. When multiple physical paths exist between switches (as shown in the redundant connections between the Core and Access tiers), STP must block one of the paths to prevent a broadcast storm.
The behavior described in the exhibit-whereport3 on Access-1enters aDiscarding state-is a result of the STP election process. In a standard STP environment, switches elect aRoot Bridgebased on the lowestBridge Priority(or lowest MAC address as a tie-breaker). Once a root is established, other switches identify the " best
" path to that root (the Root Port) and block all other redundant paths.
The provided exhibit shows that Access-1 has two paths to the core: one to Core-1 and one to Core-2. The fact that the path to Core-2 is discarded suggests that the STP topology was recalculated when Core-2 was enabled. In the context of Fortinet technical exams for this specific scenario,Option C (Core-2 has the lowest bridge priority)is the standard answer identifying that Core-2 ' s priority settings influenced the STP tree such that Access-1 ' s link to it was determined to be the redundant (alternate) path.
If the switches were configured withMCLAG (Multi-Chassis Link Aggregation), both physical links would be treated as a single logical trunk, and neither would be in a discarding state. However, without MCLAG, the system relies on bridge priorities to prune the loop.BPDU Guard (Option A)is incorrect because it would administratively shut down the port rather than placing it in an STP " Discarding " state.Option Bis incorrect as the switch would not appear in the managed topology if unauthorized.
NEW QUESTION # 44
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