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7SIGNAL Certified Wireless Engineer

What does SLA stand for?
Service Level Adherence
Service Level Agreement
Service Line Agreement
Simple Line Adherence
SLA is measured in what units?
Megabits per second
Milliseconds for ping
Percentage of adherence
Hours of uptime
What is the purpose of the Aggregator at the top of the SLA report?
It let's you choose how to group and review your data
It helps you create a report by network, band, service area
It let's you create an access point performance report
All of the above
How should you read and interpret the SLA report?
Read from top to bottom to see the trend
Look to the right first to see connectivity problems
Read from left to right to get the whole story
Look left to see Wi-Fi root cause analysis
The SLA report answers what important questions?
Can the Eye get to the access point
What's the Wi-Fi experience?
If the experience is poor, then why?
All of the above
What are Wi-Fi Experience Indicators?
They measure how the Wi-Fi network "feels" to the user
They measure the number of Wi-Fi complaints
They identify the root cause of Wi-Fi issues
They identify whether the network is up or down
When identifying root cause, what does it mean when the SLA percentage for Retries drops?
That there are network connectivity issues
That there is a problem with RADIUS
That you have interference
That you have DHCP issues
What does it mean when your SLA percentage for throughput is 75%
You've hit your performance target for throughput 75% of the time
You've reached 75% of your throughput bandwidth
You're achieving a 75% throughput level
All of the above
What is airtime utilization?
The number of clients currently connected to the AP
The level of electromagnetic current in the air
A layer 2 measurement of the percentage of time the channel is in use by Wi-Fi
The amount of interference in the band
Why is tracking airtime utilization so important?
Because it's a great measure of Wi-Fi network congestion
Because we share the air and it should be managed
Because when airtime usage increases, performance decreases
All of the above
What is Radio Attach Success Rate?
It measures how quickly the Eye associates to the AP
It measures if the Eye can associate to the AP
It measures the Eye's ability to get an IP address
It measures if the Eye can both authenticate and associate to the AP
End-to-End line charts always show what on the x-axis?
Units
Time
Data Rates
KPIs
Would a Client Retry Rate of 55% be considered acceptable for achieving good Wi-Fi performance?
Yes
No
If you want to compare individual access point performance, what do you do?
Select the AP names in the Topology
Choose APEye from the Aggregator drop-down
Select NWBandServ from the Aggregator drop-down
Right-click the chart and select your APs
7SIGNAL uses an endpoint for throughput, packet loss and jitter testing called what?
iPerf
Sonar
Reflector
Speedtester
When 7SIGNAL calculates Mean Opinion Score for voice quality, what metrics are taken into account?
Throughput and ping
Packet loss and ping
Throughput and jitter
Packet loss and jitter
Is 3.85 considered a good MOS score for Voice over Wi-Fi quality?
Yes
No
SLA is a percentage of adherence to what?
The uptime agreement
A performance target
The Wi-Fi experience indicator
The combined MOS score
Which would be considered the best signal strength for a client to connect to an AP?
-75 dBm
-65 dBm
65 dBm
55 dBm
How many APs can a Sapphire Eye connect to?
4 to 6
2 to 4
It's based on number of SSIDs not BSSIDs
Its based on signal strength not BSSIDs
The Signal Strength chart in End-to-End shows values measured between what?
Clients and access points
Sapphire Eyes and clients
Access points and Sapphire Eyes
Sapphire Eye and gateways
Is 5% considered an acceptable amount of packet loss for achieving good Wi-Fi performance?
Yes
No
Among the End-to-End charts, the AP Channel and Signal Strength charts make the most sense when you choose which Aggregation?
APGroup
NWBandServ
NWBandEye
APEye
Which of these protocols does not support 5 GHz?
802.11a
802.11abgn
802.11gn
802.11ac
Among the different End-to-End charts, why is the AP Channel chart so useful?
It helps identify the need to adjust settings in the controller
It tells you if you are using DFS channels
It shows you if you might be disconnecting clients
All of the above
Would an Airtime Utilization rate of 55% be considered acceptable for achieving good Wi-Fi performance?
Yes
No
What is the purpose of the Channels report?
To identify neighboring APs
To identify co-channel interference
To identify adjacent-channel interference
All of the above
Why is channel overlapping bad for Wi-Fi performance?
It reduces the signal stregth of neighboring access points
It causes collisions in the air which increases retries
It leads to co-channel interference
It reduces the overall number of available channels
Why it is important to monitor the client retry rate?
A decrease in retries means clients are not connecting
An increase in retries indicates a reduction in bandwidth
An increase in retries indicates some kind of interference
A decrease in retries indicates some kind of interference
In Mobile Eye, what is considered a Coverage problem?
APs are overlapping in the area
Not connected because there is no AP anywhere in the area
Connected at low signal strength with no better AP in the area
All of the above
Why are the charts contained in the Frames report so helpful?
It shows the percent of data traffic vs. management traffic
It trends airtime utilization over the selected time period
It shows you which APs are most congested
All of the above
The Data Rates report shows you what about your clients' connections?
The channel width that clients are using
The MAC addresses of clients connecting
The PHY or protocol type that clients are using
All of the above
Too many SSIDs in your environment may cause what issue?
An increase in client roaming issues
A decrease in radio attach success rate
An increase in overall airtime utilization
A decrease in beacon availability
Why is it important to identify slow clients on your Wi-Fi network?
Because they are having a poor experience and you want to help them
Because they are likely causing congestion
Because they may be causing other to have a poor experience
All of the above
To ensure your clients can go fast, it's a good practice to raise the minimum basic rate to 54 Mbps.
Yes
No
The spectrum analyzer is most useful for identifying what?
Slow clients on the network
Wi-Fi interference
Non Wi-Fi interference
Rogue access points
What does Bluetooth look like on a line spectrum chart?
5 MHz wide hump
1 MHz wide spike
20 MHz wide hump
20 MHz wide spike
What does the waterfall spectrum graph show on the y-axis
Channels in the band
Signal strength
Date/Time
None of the above
Would you agree that most non Wi-Fi interference occurs over the 5 GHz spectrum band as opposed to the 2.4 GHz spectrum band?
Yes
No
Once you've identified interference, what can you do next?
Switch channels
Just live with it
Remove it at the source
All of the above
What is band steering technology?
Used to increase Wi-Fi network usage
Used to influence clients to choose 5 GHz
Used to force clients on to 5 GHz
Used to deny clients from connecting to 2.4 GHz
The 7SIGNAL Mobile Eye app may be deployed using what tool?
GPO
SCCM
Jamf
All of the above
Is it true that in the Mobile Eye configuration you can map different throughput test endpoints to different geographic locations?
Yes
No
Which of these problems can Mobile Eye detect?
Non Wi-Fi interference that preventing a Wi-Fi connection
Malware on the device affecting throughput
Sticking to a distant AP instead of roaming to a closer one
All of the above
Which ports does a Sapphire Eye require for its connection to the cloud?
7799 and 7800
7000 and 8000
22 and 23
80 and 443
If Mobile Eye has determined that a device has chronic roaming problems, what can you do?
Update the drivers
Replace the WLAN adapter
Replace the device
All of the above
If Mobile Eye has identified a lot of co-channel interference within your network, what can you do?
Decrease Tx power
Switch to a static channel plan
Change the AP's channel
All of the above
You should download and install the latest version of Mobile Eye once a month to keep up with new features released.
True
False
Is it true that Mobile Eye can identify "noisy neighbors" interfering with your Wi-Fi network?
Yes
No
A Sapphire Eye is a Wi-Fi sensor and what else?
WLAN controller
Router/switch
High performance client
Gateway
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