Build a segmented small business network in Cisco Packet Tracer
Build and validate three VLANs, inter-VLAN routing, DHCP, internal and guest DNS, NAT/PAT and a minimum-access guest policy in a Cisco Packet Tracer lab.
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dhcpClient receives a guest VLAN address after an access port is assigned to the wrong VLAN
Trace a client that loses access to an internal web service through its DHCP lease, switch access VLAN, trunk and router ACL, then validate the port correction.
Meraki mesh repeater fails 802.1X because the gateway AP is missing from Windows NPS RADIUS Clients
Troubleshoot a Cisco Meraki MR mesh repeater where normal SSIDs work but an Enterprise/802.1X SSID fails with RADIUS timeouts because the gateway AP is not registered as a RADIUS Client in Windows Network Policy Server.
FortiGate get system arp
Display the FortiGate ARP table to map IPv4 addresses to learned MAC addresses and interfaces during local-network troubleshooting.
Recover a failed FortiOS upgrade using the backup firmware partition
Recover a FortiGate that loses LAN connectivity after a firmware jump by booting its working backup partition from the serial console and then following the verified upgrade path.