Hello @LetMePass
Net admin at the L1 and L2 deal with various issues related to the physical infrastructure and data link protocols.
-L1 issue: use case
-Cable Issues: users in a specific area are experiencing intermittent connectivity issues. The administrator might discover that a cable is damaged or improperly terminated.
-Connectivity Problems: device in a remote office is unable to connect to the network. The administrator finds that the fiber optic link between the offices is faulty.
-Power and Environmental Issues: network devices in DC are going offline unexpectedly. Investigation reveals that there are power fluctuations affecting the equipment.
-Device Hardware Failures: switch suddenly stops functioning. The administrator identifies a hardware failure, such as a malfunctioning power supply or a faulty network interface.
-Network Infrastructure Expansion: the organization is expanding, and the network administrator needs to plan the installation of new cabling and networking equipment to accommodate the growth.
-L2 issue: use case
-Switch Configuration Problems: users in a specific VLAN cannot communicate with users in another VLAN. The administrator discovers misconfigurations in the switch's VLAN settings.
-Spanning Tree Protocol Issues: the network experiences intermittent connectivity, and the administrator finds that Spanning Tree Protocol (STP) is causing unexpected port blocking due to a misconfiguration or a redundant loop.
-VLAN Configuration and Trunking: 2 switches need to communicate over multiple VLANs. The administrator troubleshoots issues with trunking configurations, ensuring that the correct VLANs are allowed across trunk links.
-Duplex Mismatch: Devices connected to a switch are experiencing slow or unreliable connections. The administrator identifies a duplex mismatch between devices, causing collisions and performance issues.
-MAC Address Table Problems: Some devices in a network segment are unable to communicate. The administrator discovers that the switch's MAC address table is not updating correctly, leading to forwarding issues.
-Broadcast and Collision Domains: The network performance is degrading due to excessive broadcast traffic. The administrator redesigns the network to reduce the size of broadcast domains.
-Troubleshooting Connectivity Issues: users in a specific department report intermittent connectivity. The administrator uses tools like ping, traceroute, and analyzing ARP tables to identify and resolve the issue.
Best regards
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