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Palo Alto Networks Network Security Analyst Sample Questions:

1. A newly deployed Palo Alto Networks firewall is showing a high number of 'deny all' hits in the traffic logs, specifically for internal DNS queries (UDP 53) originating from internal clients trying to reach public DNS servers. An outbound security policy for DNS is explicitly configured to allow UDP 53 to your internal DNS servers only. No NAT is applied for these specific DNS queries. Which of the following is the MOST LIKELY reason for these 'deny all' hits?

A) The firewall's DNS proxy feature is enabled and intercepting all DNS traffic, but not configured to forward to public DNS servers.
B) The default 'Application-Override' for DNS (port 53) is active, causing the firewall to incorrectly identify the public DNS traffic.
C) The security policy allowing DNS traffic to internal servers has 'Log at Session Start' disabled, making it appear as if the traffic is being denied when it's actually just not logged.
D) The default 'interzone-default' rule or 'intrazone-default' rule is set to deny and is being hit before the explicit DNS policy, possibly due to incorrect zone assignment or security policy rule ordering for internal-to-external traffic.
E) There is an implicit 'deny all' rule at the bottom of the security policy stack that is catching this traffic after the explicit DNS rule has been bypassed due to a misconfigured service.

2. A Palo Alto Networks firewall administrator is troubleshooting an issue where a newly deployed containerized application's traffic (TCP/8443) is intermittently identified as 'ssl' and sometimes as 'unknown-tcp', even though the application always uses the same proprietary TLS certificate and handshake. This inconsistency leads to erratic policy enforcement and dropped connections. The administrator suspects a race condition or an App-ID engine limitation with highly dynamic container environments. Which of the following advanced Application Override configurations, if applicable, would be the most effective in ensuring consistent identification of this proprietary application as 'custom-app-tls' (a pre-defined custom application)?

A) An Application Override configured with 'Source IP', 'Destination IP', 'Service' (TCP/8443), and specifying the custom application 'custom-app-tls', but prioritizing it lower than default App-ID.
B) A custom application signature created specifically to identify the proprietary TLS handshake and certificate chain of the containerized application, applied globally.
C) Implement a PBF (Policy Based Forwarding) rule to steer the container traffic to a specific security zone where App-ID is disabled for TCP/8443.
D) A simple Application Override for TCP/8443 to 'custom-app-tls' for all traffic.
E) An Application Override configured with the following CLI command structure:

3. A Palo Alto Networks firewall is configured with Decryption profiles for inbound SSL/TLS traffic inspection. Users are reporting certificate errors and browser warnings when accessing specific internal applications, while external HTTPS sites decrypt and load without issue. The firewall's trust store contains the CA certificate that signed the internal application servers' certificates. You've confirmed the decryption policy is enabled and applies to the internal traffic. What is the most likely, yet non-obvious, reason for these certificate errors, particularly when 'SSL Inbound Inspection' is in use?

A) The 'Forward Trust Certificate' configured in the Decryption Profile for inbound inspection is incorrect or not properly generated, leading to certificate path validation failures on the client side.
B) The decryption profile is configured to 'Block sessions with untrusted CA issuer', and the root CA certificate of the internal applications' signing CA is missing from the firewall's 'Trusted Root CA' store.
C) The internal application servers are using unsupported cipher suites or TLS versions that the firewall cannot decrypt.
D) The internal application servers are presenting a certificate chain that the firewall cannot properly validate, perhaps due to missing intermediate CAS or revocation issues, causing it to block or present an invalid certificate.
E) The firewall is re-signing the internal application server certificates with its own forward trust certificate, but this certificate is not trusted by the client browsers.

4. A company is implementing a new BYOD policy and needs to ensure that mobile devices accessing internal resources are protected from known and unknown malware. They have deployed a Palo Alto Networks firewall with WildFire subscriptions. Which configuration steps are essential to leverage WildFire for comprehensive malware analysis and prevention specifically for BYOD traffic, assuming a security policy rule already exists for BYOD access?

A) Modify the existing Anti-Spyware profile applied to BYOD traffic to include WildFire signature updates. Configure a Data Filtering profile to detect and block suspicious file transfers from BYOD devices. No separate WildFire Analysis profile is needed.
B) Enable WildFire analysis within the existing URL Filtering profile applied to the BYOD security policy. Configure a File Blocking profile to block all executable files, and enable WildFire submission for 'all' file types.
C) Create a WildFire Analysis profile configured to 'Block' for 'PE' files and 'upload' for all other file types. Apply this profile within a Security Profile Group along with an Antivirus profile set to 'reset-both' for critical severity threats. Ensure the Security Policy rule's action is 'allow'.
D) Create a new WildFire Analysis profile. Set the 'File Types' to 'all' and 'Action' to 'upload' for known good and bad files. Attach this WildFire Analysis profile directly to the BYOD security policy rule. Ensure Antivirus and Anti-Spyware profiles are also applied.
E) Create a WildFire Analysis profile with a 'Forward' action for 'PE' files. Create a File Blocking profile to block all 'unknown-file-types'. Group these into a new Security Profile Group and apply it to the BYOD security policy rule. Ensure the firewall has connectivity to the WildFire cloud or appliance.

5. An enterprise is deploying a new containerized application infrastructure, using Kubernetes, exposed via a dedicated load balancer that sits behind a Palo Alto Networks firewall. The security team anticipates a very high, burstable volume of legitimate traffic, but also expects sophisticated HTTP/2-based DoS attacks that exploit the protocol's multiplexing capabilities and header compression. The firewall needs to detect and mitigate these without impacting legitimate, high-concurrency connections. Given that standard HTTP/I .1 flood protection might be insufficient, what advanced DoS profile configurations should be prioritized for the Palo Alto Networks firewall to protect this environment, assuming HTTP/2 inspection is enabled?

A) Focus on 'Session Based Attack Protection' with very high 'Max Concurrent Sessions' and 'Session Rate' thresholds, coupled with 'Packet Based Attack Protection' for TCP and UDP floods to handle general volumetric attacks.
B) Implement 'Zone Protection' on the ingress zone, enabling 'Flood Protection' for 'HTTP Flood' and setting 'Action: Reset'. Complement this with 'IP Address Block' for sources exceeding a high connection rate.
C) Configure 'DoS Protection Policy' with 'Target' rules for the load balancer IPs. Within these rules, enable 'HTTP Flood' protection. Critically, utilize 'HTTP Header Length' and 'HTTP Header Count' thresholds to detect HTTP/2 'HPACK Bomb' or excessive header attacks. Also, set 'Client Read Timeout' for 'Slow HTTP Protection' and ensure 'Action: Protect' is chosen for relevant thresholds.
D) Enable 'HTTP Flood' protection with 'Per-Request Rate' and 'Per-Source IP Rate' thresholds, and configure 'Syn-Cookie' as the action. Also, set a low 'Client Read Timeout' in 'Slow HTTP Protection' to counter slow HTTP/2 attacks.
E) Utilize 'HTTP Flood' protection within a DoS Protection Profile, ensuring 'HTTP/2' is enabled for inspection on the relevant security policy. Set 'Per-Request Rate' and 'Per-Source IP Rate' aggressively, and importantly, tune 'Per-URL Rate' and 'URL Query String Length' thresholds to detect malformed or excessively long HTTP/2 requests/streams.

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