Free Juniper JN0-251 Exam Actual Questions

The questions for JN0-251 were last updated On Nov 19, 2024

Get All 77 Questions
Question No. 1

What are two characteristics of the 2.4 GHz band when compared to the 5 GHz band? (Choose two.)

Show Answer Hide Answer
Correct Answer: B, D

The correct answer is B. lower frequency and D. more congestion. These are two characteristics of the 2.4 GHz band when compared to the 5 GHz band.The 2.4 GHz band uses lower frequencies than the 5 GHz band, which means that it can penetrate solid objects better and have more range1.However, the lower frequencies also mean that the 2.4 GHz band has less bandwidth and speed than the 5 GHz band1.The 2.4 GHz band is also more congested than the 5 GHz band, as it has fewer non-overlapping channels and more interference from other devices and routers that use the same frequency band23.The 5 GHz band, on the other hand, has more non-overlapping channels and less interference, which makes it faster and more reliable23.

Question No. 2

Which two statements about the Mist UI are true? (Choose two.)

Show Answer Hide Answer
Correct Answer: A, B

According to the official Mist documentation1, wireless packet captures are helpful when trying to dissect and dig down into the root cause of any wireless issue between a client and AP. You can determine if packets being sent are actually reaching their destination as well as identify if packets are corrupted. With the enhanced packet capture flow, Mist also introduced the ability to capture packets on the wired side of your network as well. This data is captured from the Eth0 port of your AP, and will examine the packets between the AP and the rest of your wired network. This includes any RADIUS, DHCP, or DNS servers you have set up.

The Mist UI does not support BLE packet capture or packet capture on cloud uplink.

Question No. 3

Which two statements are correct when managing switches located in a Mist-managed site? (Choose two.)

Show Answer Hide Answer
Correct Answer: A, D

Question No. 4

Which statement is correct about Mist AP packet capture?

Show Answer Hide Answer
Correct Answer: A

According to the web search results, Mist AP packet capture is a feature that allows you to capture packets from a specific AP or client and analyze them using a tool such as Wireshark1.Packet capture can help you troubleshoot and diagnose various wireless issues, such as DHCP errors, authentication failures, or roaming problems1.You can configure a wired or wireless packet capture manually by using the Mist portal or the Mist AI app23.

To configure a wired packet capture manually, you can go to Network > Packet Captures in the Mist portal and select the AP and the TCP dump expression that you want to capture packets for2.The TCP dump expression is a filter that specifies the type, source, destination, and port of the packets that you want to capture2.You can use the TCP dump expression builder to create your expression or edit it directly if you are familiar with the syntax2.You can also adjust the packet capture settings, such as the number of packets, duration, and maximum packet length2.Once you start the capture, you can download the PCAP file and open it in Wireshark for analysis2.

To configure a wireless packet capture manually, you can go to Network > Packet Captures in the Mist portal and select the AP and the WLAN that you want to capture packets for3.You can also adjust the packet capture settings, such as the number of packets, duration, and maximum packet length3.Once you start the capture, you can download the PCAP file and open it in Wireshark for analysis3.Alternatively, you can use the Mist AI app to scan the QR code on the AP and start a wireless packet capture from your mobile device3.


Question No. 5

The Mist help menu provides direct access to which two features? (Choose two.)

Show Answer Hide Answer
Correct Answer: C, D

According to the web search results, the Mist help menu provides direct access to feature updates and firmware updates, among other options.Feature updates are weekly updates that show the new features and enhancements that are added to the Mist platform1.Firmware updates are software updates that show the latest firmware versions for different Mist devices, along with the release notes and the features they support2.You can access these options from the Support Tickets and Documentation menu in the Mist GUI12.You can also use the ? mark in the upper right of the UI to see the latest firmware and previous production releases2.


Get All 77 Questions Explore Other Juniper Exams