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Palo Alto Networks Network Security Analyst Sample Questions:

1. A Security Administrator is implementing a new policy on a Palo Alto Networks firewall. The requirement is to allow specific internal users access to Salesforce, but only for the 'Sales Cloud' application, and block all other Salesforce functionalities. The organization also wants to enforce strict file transfer restrictions within this allowed Salesforce access. Which combination of Security Policy elements and profiles would be most effective and precise in achieving this goal?

A) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: salesforce-salescloud, Service: application-default, Actions: allow, Profile: File Blocking Profile (block executable & archives), Data Filtering Profile (block PII), Antivirus Profile, Vulnerability Protection Profile.
B) Source Zone: Trust, Source User: any, Destination Zone: Untrust, Application: salesforce-base, Service: tcp/443, Actions: allow, Profile: Data Filtering Profile (block sensitive data).
C) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: salesforce-base, Service: application-default, Actions: allow, Profile: File Blocking Profile (block all files).
D) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: any, Service: application-default, Actions: allow, Profile: URL Filtering Profile (allow salesforce.com), File Blocking Profile (block all files).
E) Source Zone: Trust, Source IJser: sales_team_group, Destination Zone: Untrust, Application: salesforce-salescloud, Service: application-default, Actions: allow, Profile: File Blocking Profile (block executable & archives), WildFire Analysis Profile.

2. 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 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.
B) 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.
C) The default 'Application-Override' for DNS (port 53) is active, causing the firewall to incorrectly identify the public DNS traffic.
D) 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.
E) The firewall's DNS proxy feature is enabled and intercepting all DNS traffic, but not configured to forward to public DNS servers.

3. A critical application behind a Palo Alto Networks firewall intermittently loses connectivity. Packet captures on the firewall show SYN packets from the client reaching the firewall, but no SYN-ACK is returned. The firewall's session browser shows sessions in a 'DOWN' state for this traffic. The security policy rule permitting this traffic has 'Service: application-default' and 'Application: '. The security logs show 'Permit' actions, but the session never establishes. Which of the following is the MOST PROBABLE cause?

A) Asymmetric routing causing the return traffic to bypass the firewall.
B) A fragmented packet from the client is being dropped due to a max-fragment-size setting, preventing session setup.
C) The firewall's TCP session setup timeout is too aggressive for the application's response time.
D) The server hosting the application is not responding to SYN requests due to being overloaded or misconfigured.
E) A conflicting security policy rule with a more specific match is denying the traffic, but due to session state, initial logs show 'Permit'.

4. A network security architect is designing DoS protection for a critical API gateway behind a Palo Alto Networks firewall, which uses proprietary protocols over UDP on port 12345. The design requires a solution that: 1. Can identify and mitigate UDP floods targeting port 12345 based on packet rate. 2. Must differentiate between legitimate high-volume API calls from whitelisted partners and malicious floods. 3. Should NOT drop legitimate traffic, even under high load from partners. 4. Must automatically block sources identified as malicious for a configurable duration. Which combination of DoS protection profile elements and policy configuration in Palo Alto Networks firewall would best achieve these complex requirements?

A) Utilize a 'DoS Protection Profile' with 'UDP Flood' enabled and 'Action: Syn-Cookie' (for UDP). Apply this profile to a 'Security Policy' rule. Use a 'PBF' rule to direct whitelisted partner traffic around the DoS inspection.
B) A 'Zone Protection' profile on the DMZ zone with 'UDP Flood' enabled, setting a high 'Per-Packet Rate' threshold. Implement 'DoS Protection Policy' 'whitelist' rules for known partner IP ranges, setting 'Action: Allow' for their traffic.
C) Configure a 'DoS Protection Policy' with a 'target' rule for the API gateway, enabling 'UDP Flood' protection (on port 12345) with 'group-by: source-ip'. Set 'Action: Block' with a 'Block Duration'. Additionally, create a higher-priority 'DoS Protection Policy' 'allow' rule for whitelisted partner IPs, with no DoS thresholds configured.
D) Create a 'DoS Protection Policy' with a 'target' rule for the API gateway. Inside this rule, configure 'packet-based-attack-protection' for 'UDP Flood' (port 12345) with a 'Per-Packet Rate' and 'Action: Block' with a 'Block Duration'. Concurrently, define a 'DoS Protection Policy' 'exception' rule placed before the 'target' rule, specifying 'Source: Whitelisted_Partners_Address_Group' and 'Action: Allow'.
E) A 'DoS Protection Policy' with a 'target' rule for the API gateway, enabling 'UDP Flood' protection with 'Per-Packet Rate' and 'Action: Drop'. Create a separate 'Security Policy' rule allowing whitelisted partners with 'No DoS Protection' applied.

5. Consider the following XML configuration snippet for a Palo Alto Networks decryption profile:
yes yes yes block yes
If this 'CustomDecryptionProfile' is applied to a security policy, and an internal user attempts to access a legitimate external website whose certificate chain includes an intermediate CA that is not present in the firewall's trusted CA store, what will be the likely outcome for that connection?

A) The connection will be allowed but not decrypted, as the firewall cannot build a trusted chain.
B) The connection will be blocked due to the 'untrusted-cert-action' setting, which implicitly covers intermediate CA trust failures.
C) The firewall will attempt to download the missing intermediate CA certificate automatically to complete the chain.
D) The connection will be allowed, and the user will receive a browser warning about an untrusted certificate.
E) The connection will be allowed and decrypted, as 'untrusted-cert-action' only applies to the root C

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