A network administrator notices that several users cannot connect to the internet. Upon examination, the administrator finds that the users can successfully ping devices within the LAN but fail to ping any external IP addresses. Assuming there have been no recent changes to firewall settings, which OSI layer should the administrator scrutinize NEXT for potential issues?
Investigate the Application Layer for configuration issues in web browsers or other software
Examine the Network Layer for issues with routing or the routing table
Inspect the Data Link Layer for problems with switches or VLAN configurations
Check for Physical Layer issues with connectors or cabling