Day 27: Troubleshooting and LAN Versus WAN

The following commands display information about connectivity and configuration on a device. Table 1-7 describes general troubleshooting tasks for each OSI layer.

• ipconfig shows the IP configuration.

• ping tests network layer connectivity between devices.

• tracert tests connectivity and displays each hop.

• netstat shows any network connections to the device.

• nslookup queries the configured name server for DNS information.

Table 1-7. Troubleshooting for Each OSI Layer

LANs today often represent the logical grouping of hosts for a single organization. Network administrators typically refer to the network they maintain in their building (or buildings) as a LAN or private intranet. LANs support high data transfer rates over Ethernet or wireless protocols in a smaller geographic area. A WAN provides relatively lower data transfer rates over a larger geographic area.