The Show commands display important information about the configuration and operation of the device in the Cisco IOs command Line Interface (CLI) mode. Network administrators use different show commands to examine device status, interfaces, process and configuration files to validate the device operational status. The status of almost all process and function of the router can be view and verify using show command. The important show commands of Cisco IOS are the following:-
The Trace is a diagnostic utility which displays the route from host to a destination using ICMP echo packets to the destination. it proceeds a list of hops as a packet is routed through a network. it uses varying TTL values as each router down the path is required to decrement the packet’s TTL by at least 1 before forwarding the packet, the TTL is working just like a hop counter. When the TTL value reaches zero (0), the router sends an ICMP “Time Exceeded” message back to the source.
The network baseline is one of the most useful tools for monitoring and troubleshooting network performance. For the effective network, performance baseline is required over a period of time. Measuring performance at varying times and loads will help in creating a better image of overall network performance
The ping is a very helpful utility to test and troubleshoot network devices connectivity. It uses the Internet Control Message Protocol (ICMP). The ping command indicates the source of the problem. It is an initial step in troubleshooting a network failure.