NSE4_FGT-7.0 · Question #158
Which three CLI commands can you use to troubleshoot Layer 3 issues if the issue is in neither the physical layer nor the link layer? (Choose three.)
The correct answer is B. execute ping C. execute traceroute D. diagnose sniffer packet any. To troubleshoot Layer 3 network issues when physical and link layers are not at fault, essential CLI commands include execute ping, execute traceroute, and diagnose sniffer packet any.
Question
Which three CLI commands can you use to troubleshoot Layer 3 issues if the issue is in neither the physical layer nor the link layer? (Choose three.)
Options
- Adiagnose sys top
- Bexecute ping
- Cexecute traceroute
- Ddiagnose sniffer packet any
- Eget system arp
How the community answered
(37 responses)- A3% (1)
- B95% (35)
- E3% (1)
Why each option
To troubleshoot Layer 3 network issues when physical and link layers are not at fault, essential CLI commands include `execute ping`, `execute traceroute`, and `diagnose sniffer packet any`.
`diagnose sys top` displays system resource usage (CPU, memory, processes) and is primarily for troubleshooting performance issues or high resource consumption, not direct Layer 3 connectivity problems.
The `execute ping` command is used to test basic IP connectivity and reachability between devices at Layer 3 by sending ICMP echo requests and measuring response times.
The `execute traceroute` command helps identify the full network path a packet takes to a destination, revealing Layer 3 routing issues, hops, and potential points of failure or latency along the route.
The `diagnose sniffer packet` command captures and displays real-time network traffic, allowing for detailed inspection of Layer 3 headers (IP addresses, protocols) and payload to diagnose routing, ACL, or other IP-level communication problems.
`get system arp` displays the Address Resolution Protocol (ARP) table, which maps IP addresses to MAC addresses; ARP operates at Layer 2 (Data Link Layer), and the question specifically excludes Layer 2 issues.
Concept tested: FortiGate Layer 3 network troubleshooting commands
Source: https://docs.fortinet.com/document/fortigate/7.4.0/administration-guide/522197/troubleshooting-commands
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