Saturday, November 24, 2007

Networks: Communication routes

A computer is unable to communicate with a different computer located on a remote network.
How can you determine at what point the communication is failing?
1. >>Run tracert
2. Run ipconfig.
3. Run netstat.
4. Run nslookup.

Explanation : You should run tracert, followed by the destination computer name or address. The tracert command tests each hop between the source and destination computers. The tracert command can be used to determine the route taken to the destination computer and can be used to determine the point at which communication fails.

You should not run ipconfig to determine at what point the communication is failing. The ipconfig command is used to view IP configuration information and to release or renew IP address leases, that is, an address received from a Dynamic Host Configuration Protocol (DHCP) server.

You should not run netstat to determine at what point the communication is failing. The netstat command lets you view a wide range of networking statistics. For example, the netstat command can be used to identify which ports are open and are monitored ("listened to") by the computer. Ports are used to direct network traffic to the appropriate service or application. The most commonly used default ports are defined as well-known ports. Ports often found open on a Windows computer include port 80, which is the default for Hypertext Transfer Protocol (HTTP) traffic for Web-related traffic, and port 53, which is used for Domain Name Service (DNS) traffic.

You should not run nslook to determine at what point the communication is failing. The nslookup command is used with the Domain Name Service (DNS) and can be used to locate DNS servers and test DNS service operations.
Objective: Networks