Discuss what methods youve used for troubleshooting and how

Discuss what methods you’ve used for troubleshooting, and how these techniques compare to other methods. There are a great variety of tools available for troubleshooting, discuss what tools you’ve used to fix network problems. If you haven\'t used any research several and in either case determine the advantages and disadvantages of each

Solution

1. Ping:

       The most commonly used network tool is the ping utility. This utility is used to provide a basic connectivity test

between the requesting host and a destination host. This is done by using the Internet Control Message Protocol

(ICMP) which has the ability to send an echo packet to a destination host and a mechanism to listen for a

response from this host. Simply stated, if the requesting host receives a response from the destination host, this

host is reachable. This utility is commonly used to provide a basic picture of where a specific networking problem

may exist. 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.

2. Tracert/traceroute

Typically, once the ping utility has been used to determine basic connectivity, the tracert/traceroute utility can used

to determine more specific information about the path to the destination host including the route the packet takes

and the response time of these intermediate hosts. The tracert utility and traceroute utilities

perform the same function but operate on different operating systems, Tracert for Windows machines and

traceroute for Linux/*nix based machines.

3. Ipconfig/Ifconfig

One of the most important things that must be completed when troubleshooting a networking issue is to find out the

specific IP configuration of the variously affected hosts. 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. The utilities that can be used to find out this IP configuration information include the

ipconfig utility on Windows machines and the ifconfig utility on Linux/*nix based machines.

4. Nslookup

Some of the most common networking issues revolve around issues with Dynamic Name System (DNS) address

resolution issues. DNS is used by everyone using the Internet to resolve commonly known domain names (i.e.

google.com) to commonly unknown IP addresses (i.e. 74.125.115.147). When this system does not work, most of

the functionality that people are used to goes away, as there is no way to resolve this information. The nslookup

utility can be used to lookup the specific IP address(es) associated with a domain name. If this utility is unable to

resolve this information, there is a DNS issue. Along with simple lookup, the nslookup utility is able to query

specific DNS servers to determine an issue with the default DNS servers configured on a host.

5.Netstat

Often, one of the things that are required to be figured out is the current state of the active network connections on

a host. This is very important information to find for a variety of reasons. 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. It is

also possible to use the netstat utility to determine which services on a host that is associated with specific active

ports.

6 PuTTY/Tera Term

When connecting to a variety of different types of equipment, a telnet, SSH or serial client is required; when this is

required both the puTTY and Tera Term programs are able to provide these functionalities. The selection of one over

the other is strictly a personal preference.

7 Subnet and IP Calculator

One of the most important tools in the belt of a junior network engineer is an IP network calculator. These can be

used to unsure a correct IP address selection and with this a correct IP address configuration. 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. Two of the more commonly used free IP calculators

include Wildpackets (Bitcricket) Network Calculator and Solarwinds Advanced Subnet Calculator which can be

found at the links below.

http://www.bitcricket.com/downloads/IPCalculator.msi

http://downloads.solarwinds.com/solarwinds/Release/FreeTool/SolarWinds-Subnet-Calculator.zip

8 Speedtest.net/pingtest.net

A very easy test that can be used to both determine the Internet bandwidth available to a specific host and to

determine the quality of an Internet connection is the use of the tools available at the speedtest.net and pingtest.net

websites. The speedtest.net site provides the ability to determine the amount of bandwidth that is available to a

specific host at a specific point in time; this is often a good tool to use when measuring how long it is going to take

to upload or download information from a local to remote host. 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 amount of bandwidth difference is expected between the quoted bandwidth purchased and

the measured bandwidth. The pingtest.net website is used to determine the quality of the connection by measuring

the ping response times and jitter amounts over a short period of time. 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.

9 Pathping/mtr

In an effort to take advantage of the benefits of both the ping and tracert/traceroute commands, the pathping and

mtr utilities were developed. 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.

10 Route

This utility is used to display the current status of the routing table on a host. While the use of 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.