A plus 220-1001 – Exam Objective 5.7 – Dumps4shared

A plus 220-1001 – Exam Objective 5.7

A+ Exam Objective 5.7 – ExamNotes

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A+ Main Domain 5.7: Given a scenario, troubleshoot common wired and wireless network problems.

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Welcome to ExamNotes by Dumps4shared! Today we will look at the connectivity of wired and wireless networks. What are some of the more common connectivity issues? What can we do to address them?

Common Symptoms

Limited & Local Connectivity

Local connectivity and intermittent connectivity can all be addressed
with the same basic troubleshooting methods. For the purposes of the exam
objectives, network shares, printers, and email are considered to be local
resources.

Begin by trying to access a known working address on your local network. This will help to determine whether your problem is with the physical network or the programs and protocols being used. If your connection is wired, check the indicator status to see if the lights are on and flickering.

Next, check the neighboring computers for signs of the same problem. Determine whether you have a problem with one PC or 20 PCs. The troubleshooting methods for each case will be different.

If you are able to access some but not all of the available network resources, determine the level of accessibility and see if there is a pattern. Perhaps a bad network segment or a device can be isolated as the point of failure.

Once you have narrowed down the problem to a specific area in
your network, rule out issues with your internet service provider and the installed
equipment.

Check the IP address assigned to the device. If it starts with 169.254.xxx.xxx, you know it has been assigned an APIPA address which prevents it from communicating with the DHCP server.

To summarize:

1) Check lights on the NIC and devices.
2) Test or swap out the Ethernet cable.
3) Check switches and indicator lights on wireless connections.
4) For wireless connections, consider radio power, frequency, and line of sight issues.
5) Decide if you want to use the command line interface or GUI based diagnostics. For this example, let’s do the command line first. Open a command prompt by clicking the command prompt icon or typing cmd in the search window.
6) Let’s use a few commands and varieties to diagnose the NIC and establish its relative location. First, let’s check that the NIC, its drivers, and the protocol stack are functioning properly. Ping the localhost by name (ping localhost) and number (ping 127.0.0.1). Next, ping a common internet address. Most DNS servers will have looked up Google recently. Google’s IP address is surprisingly simple (8.8.8.8). Ping Google to validate connectivity.

Unavailable resources

In addition to the local resources listed above, Internet
connectivity can also be impacted by the same issues. If you can’t connect to
your local network, your connection to the Internet can be impacted.

No connectivity

Generally when we discuss connectivity, we’re talking about
wireless connectivity. We will look at all aspects of the wireless connection
from the SSID to channel selection.

APIPA/link
local address

APIPA/Link Local Addressing is used to assign an IP address to a
client. The Windows nodes on a network will self-assign non-routable addresses
to themselves until the server is able to provide an address.

IP
Conflict

An IP Conflict occurs when two IP based machines use the same
address. Duplicate addresses are not tolerated by the TCP/IP addressing scheme.

Other IP
related issues

You can stock utilities such as variations of the ipconfig
utility. You can test the settings on your new DHCP server by creating, renewing,
and refreshing the IPv4 and IPv6 addresses. The addressing can be
systematically modified whenever necessary using this process.

Slow
transfer speeds

This occurs when your resources are impacted by the number of
users on a segment or link. The advertised connection speed is measured when no
other devices are competing for resources. As the number of users increases,
the comparative speed will decrease. Be aware of the number and type of
connections in use by your device at any given time. Monitor and end any app
that is using resources without proving a useful service.

Low RF
signal

When you encounter nominal RF signals, it is very difficult for
your devices to perform up to their optimal rates. As the power levels drop on
the radio, you will see a decrease in performance. In the image below, observe
the Linksys WAP that has low/no power.

Weak RF showing on open wireless network

SSID
not found

In many cases, it is advisable to hide your SSID from the prying
eyes of the internet. If you think about it, you are providing would be
attackers with 50% of the information necessary to access your wireless
network. Here is a good look at Windows Wireless settings available from the
Taskbar.

Screenshot of open wireless networks

Check the warning that comes from your cable provider. Open
season! If the connection has to be “Open,” then you should not broadcast the
address.

That’s all for Sub-Objective 5.7! The tools you would use to
test and repair connections are listed in 220-1001 Sub-Objective 2.8. Review
this section if you need a refresher.

If you have read all of the 220-1001 content to this point, congratulations!! You are ready to move into the 220-1002! Good luck!

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