A user reports that their laptop can connect to the corporate SSID but cannot reach the internet. The network team initiates a packet capture on the user's AP with a filter for the laptop's MAC address. In the capture, they see the laptop send DHCP Discover packets but receive no DHCP Offer. What is the most likely cause of this issue?

The SSID is configured with MAC authentication, which is failing for this laptop.

The DHCP server is located on a different VLAN that is not reachable from the AP's access VLAN.

The laptop's firewall is blocking incoming DHCP Offer packets.

The AP's radio is malfunctioning and dropping all unicast packets.

A company has a guest Wi-Fi network that requires users to accept a terms-of-service page before accessing the internet. A user reports that they can connect to the guest SSID and see the terms page, but after accepting, they cannot browse the internet. A packet capture is taken on the AP for the user's device. In the capture, the administrator sees the user's device send an HTTP request to the captive portal, receive a 200 OK response, and then send an HTTP request to an external website, but no response is seen. What is the most likely cause of this issue?

The user's device is not receiving a DHCP lease, so it has no valid IP address for internet traffic.

The DNS server is not resolving the external website's domain name.

The firewall is not allowing the user's traffic to pass after captive portal authentication.

The AP's radio is malfunctioning and dropping packets after the initial connection.

A network engineer is investigating a complaint about slow performance on a specific application. A packet capture is taken on the AP for the affected client. In the capture, the engineer notices a high number of TCP retransmissions and duplicate ACKs for the application's traffic. What is the most likely network issue indicated by these observations?

The application server is overloaded and responding slowly.

The DNS server is slow to resolve the application's hostname.

The client's TCP window size is set too small.

Packet loss is occurring on the wireless link between the client and the AP.

When analyzing a packet capture, what might indicate an authentication failure for a wireless client?

Repeated 802.11 authentication or association request frames without a successful response

A large amount of TCP retransmissions

A high number of broadcast frames in the capture

The presence of DNS query packets

Juniper NetworksCertified Associate, Mist AI

Domain 4Objective 2

Packet Captures JN0-253 Practice Questions (Page 4)

Part of the Juniper Mist Monitoring and Analytics domain, which makes up ~16% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~6–10 in this domain), expect 1–2 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

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5concepts

Questions 16–20

16expert · hard
A user reports that their laptop can connect to the corporate SSID but cannot reach the internet. The network team initiates a packet capture on the user's AP with a filter for the laptop's MAC address. In the capture, they see the laptop send DHCP Discover packets but receive no DHCP Offer. What is the most likely cause of this issue?
Select an answer first
17expert · hard
A company has a guest Wi-Fi network that requires users to accept a terms-of-service page before accessing the internet. A user reports that they can connect to the guest SSID and see the terms page, but after accepting, they cannot browse the internet. A packet capture is taken on the AP for the user's device. In the capture, the administrator sees the user's device send an HTTP request to the captive portal, receive a 200 OK response, and then send an HTTP request to an external website, but no response is seen. What is the most likely cause of this issue?
Select an answer first
18expert · hard
A network engineer is investigating a complaint about slow performance on a specific application. A packet capture is taken on the AP for the affected client. In the capture, the engineer notices a high number of TCP retransmissions and duplicate ACKs for the application's traffic. What is the most likely network issue indicated by these observations?
Select an answer first
19foundation · easy
When analyzing a packet capture, what might indicate an authentication failure for a wireless client?
Select an answer first
20application · medium
A network administrator is preparing to capture traffic on an AP to troubleshoot a client that is experiencing slow throughput. The administrator wants to capture only the traffic to and from that client's IP address. Which filter syntax should the administrator use when starting the capture?
Select an answer first

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Packet Captures JN0-253 Practice Questions (Page 4)

Questions 16–20

When analyzing a packet capture, what might indicate an authentication failure for a wireless client?

A network administrator is preparing to capture traffic on an AP to troubleshoot a client that is experiencing slow throughput. The administrator wants to capture only the traffic to and from that client's IP address. Which filter syntax should the administrator use when starting the capture?

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