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Juniper JN0-251 Exam

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Viewing Questions 71 77 out of 77 Questions

Question 71
Under ideal conditions, which frequency band will have the farthest usable range?
A. 900 MHz
B. 2.4 GHz
C. 5 GHz
D. 6 GHz

Question 72
Which statement is correct about a WLAN RF medium?
A. A WLAN RF is a full duplex, contention free medium where each client transmits on a separate channel.
B. A WLAN RF is a full-duplex, contention-free medium where 802.11 stations can transmit and receive at the same time.
C. A WLAN RF is a half-duplex, shared medium where 802.11 stations contend with each other for access.
D. A WLAN RF is a half-duplex, contention-free medium where the access point polls each station in turn.

Question 73
Referring to the exhibit, what do you determine about the site's Time to Connect SLE metric?
A. Successful connect averaged 1.6 seconds.
B. Eighty percent of the Time to Connect failures are related to DHCP failures
C. All clients cannot connect to the Internet.
D. Time to Connect Association DHCP failures impacted 80% of users.

Question 74
What is an 802.11 management frame transmitted by an AP?
A. echo request
B. ping
C. keepalive
D. beacon

Question 75
You are troubleshooting a signal strength issue when you notice that the signal strength changes from -70 to -73 dBm as you move from one room to another.
In this scenario, what is happening?
A. Signal strength has increased by 10x.
B. Signal strength has decreased by 10x.
C. Signal strength has doubled.
D. Signal strength has halved.

Question 76
Users are complaining about WLAN performance and the Mist dashboard reports non-Wi-Fi interference.
Which diagnostics tool would you use to further investigate this issue on-site and determine the location of the interference?
A. spectrum analyzer
B. protocol analyzer
C. wireless design software
D. WLAN scanner

Question 77
You have just brought online a new site of AP43s. While verifying that everything looks good, you notice that all of the access points (APs) are reporting "insufficient power." The APs are connected to an 802. 3at-capable switch.
In this scenario, what would be the cause of the error?
A. The cable run to each AP is too long.
B. The Ethernet cable is plugged into the wrong port on the AP.
C. The APs' firmware must be upgraded.
D. LLDP-MED is not configured on the switch.