Packet Captures JN0-253 Practice Questions (Page 1)

Questions 1–5

1. 1expert · hard

   A network administrator is troubleshooting a VoIP call quality issue. A packet capture is taken on the AP for the VoIP phone. In the capture, the administrator sees the SIP INVITE message and the 200 OK response, followed by RTP packets. However, the RTP packets show a high jitter value. What is the most likely cause of the jitter?

   • AThe DNS server is slow to resolve the SIP server's hostname.
   • BThe SIP server is overloaded and processing calls slowly.
   • CIntermittent packet loss on the wireless link causing variable delays.
   • DThe phone's codec is set to a low bitrate.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   In which scenario would a network administrator most likely use a packet capture in Juniper Mist?

   • ATo generate a report of top talkers for capacity planning
   • BTo monitor overall network utilization trends over the past month
   • CTo verify that a new firmware version is compatible with all connected clients
   • DTo investigate why a specific client cannot associate to a wireless network
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   Which of the following is a configurable option for a packet capture in Juniper Mist?

   • AThe sampling rate of the capture
   • BThe priority of the capture session
   • CThe packet size (snapshot length)
   • DThe compression level of the capture file
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5. 4application · easy

   A network engineer has captured packets on an AP to troubleshoot a client that is failing 802.1X authentication. The engineer wants to analyze the EAP conversation in detail using an external tool. What is the correct workflow to get the capture data into the external tool?

   • ATake a screenshot of the capture in the Mist UI and share it with the analysis tool.
   • BDownload the PCAP file from the Mist portal and open it in Wireshark.
   • CCopy the decoded packet details from the Mist UI and paste them into a text file for the external tool.
   • DUse the Mist API to export the capture in a proprietary format that requires a special plugin.
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6. 5application · medium

   A network engineer is planning a packet capture on a busy AP to troubleshoot a slow application. The engineer wants to minimize the size of the capture file while still capturing the necessary information. Which configuration option should the engineer adjust to achieve this?

   • AReduce the packet size (snap length) to capture only the headers of each packet.
   • BIncrease the capture duration to ensure more packets are captured.
   • CDisable the filter to capture all traffic on the AP.
   • DChange the capture interface from the radio to the uplink port.
   Reveal Solution Discussion Select an answer first