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For example, when verifying the status of a listening port on a host or to check and see what remote hosts are connected to a local host on a specific port. Simply stated, if the requesting host receives a response from the destination host, this host is reachable.
Contributor Sean Wilkins Sean Wilkins is an accomplished networking consultant who has been in the IT field for more than 20 years, working with several large enterprises. Along with simple lookup, the nslookup utility is able to query specific DNS basic networking troubleshooting pdf download to determine an issue with the default DNS servers configured on a host. Get our content first.
Figure 9 and 10 below show example output from both of these sites.
This measurement can also be used to determine whether the connection is offering the amount of bandwidth that was purchased from the Internet provider; keep in mind however that some basic networking troubleshooting pdf download of bandwidth difference is expected between the quoted bandwidth purchased and the measured bandwidth. Sometimes this information is already known when addressing is configured statically, but when a dynamic addressing method is used, the IP address of each host can potentially change often.
This article reviews the top 10 basic tools that can help you troubleshoot most networking issues.
For example, if an Internet connection is down at an office, the ping utility can be used to figure out whether the problem exists within the office or within the network of the Internet provider. Figure 13 below shows an example of the route utility being used on a Windows machine. These can be used to unsure networkijg correct IP address selection and with this a correct Basic networking troubleshooting pdf download address configuration.
Doqnload message only appears once. Ping The most commonly used network tool is the ping utility. While the use basic networking troubleshooting pdf download the route utility is limited in common situations where the host only has a single IP address with a single gateway, it is vital in other situations where multiple IP address and multiple gateways are available.
Top 10 Basic Network Troubleshooting Tools Every IT Pro Should Know | Pluralsight
While it is true that the the use of specific tools can be subjective and at the discretion of the engineer, the selection of tools in this article has been made based on their generality and common use. The selection of one over basic networking troubleshooting pdf download other is strictly a personal preference. Figure 5 below shows an example of the netstat utility being used to display pddf currently active ports on a Linux machine.
Both of these tools take the functionality and information that can be obtained from these types of tools and provide a more detailed single picture of the path characteristics from a specific host to a specific destination. It is also possible to use the netstat utility to determine which services on a host that is associated with specific basic networking troubleshooting pdf download ports. If this message remains, it may be due to an ad blocker.
This utility is commonly used to provide a basic picture of where a specific networking problem may exist. Please click here if you are not redirected within a few seconds. The nslookup utility can be used to lookup the specific IP address es associated with a domain name. Figure 2 below shows an example of the tracert utility being used to find the path from a host inside an office to www.
This utility is used to display the current status of the routing table on a host. When troubleshooting a networking issue, the amount of time that it takes to find and fix a problem directly affect the wasted costs that it causes to any system relying on the network.
Figure 1 below shows an example of the ping utility being used to obtain the reachability status of the locally connected router. If this utility is unable to resolve this information, there is a DNS issue. DNS is used by everyone using the Internet to resolve commonly known domain names i. Sean Wilkins is an accomplished networking consultant who has been in the IT field for more than 20 years, working with several large enterprises. Figure 4 below shows an example of how the nslookup utility can be used to query basic networking troubleshooting pdf download associated IP address information.
This is very important information to find for a variety of reasons. This article has basic networking troubleshooting pdf download a look at the 10 most commonly used tools that can help in ensuring that the time basic networking troubleshooting pdf download it takes to find and fix a problem is as short as possible. This information can be used to determine a likelihood of how well the measured connection will deal with certain types of high demand traffic like Voice over IP VoIP or gaming.
I hope the information in this article can be helpful in future troubleshooting. While this type of tool is used by senior level network engineers, much of the information obtained from the tool becomes simpler to calculate the longer and more experience you have in the field. Network troubleshooting tools are a necessity for every network administrator. Subnet and IP Calculator One of the most important tools in the belt of a junior network engineer is an IP network calculator.
Route Utility Summary As basic networking troubleshooting pdf download any job, the type of tools that are quickly available can greatly influence the amount of time that it takes to complete a job. When getting started in the networking field, it is important to amass a number of tools that can be used to troubleshoot a variety of different network conditions.
Figure 3 below shows an example of the ifconfig utility showing the IP configuration information of a queries host. Basic networking troubleshooting pdf download Often, one of the things that are required troubleshootlng be figured out is the current state of the active network connections on a host.
This is done by using the Internet Control Message Protocol ICMP nwtworking has the ability to send an echo packet to a destination host and a mechanism to listen for a response from this host.
This utility is used to provide a basic connectivity test between the requesting host and a destination host.