PCNSA Quick Quiz — 10 Questions

Question 1

A user at 192.168.1.10 attempts to access a social networking site (application: social-networking). Based on the exhibit, what will the firewall do?

Accepted Answer

Deny the traffic because rule 2 matches and denies social-networking.. The firewall evaluates rules in order from top to bottom. Rule 2 explicitly denies the application 'social-networking', and since the user at 192.168.1.10 is attempting to access a social-networking site, rule 2 matches before any subsequent rule. Therefore, the traffic is denied. Option D is correct because rule 2 matches and denies the traffic.

Answer

Allow the traffic because rule 1 matches and allows all web traffic.

Answer

Allow the traffic because rule 3 allows all traffic.

Answer

Deny the traffic because no rule allows social-networking.

Question 2

Drag and drop the steps to configure a site-to-site IPsec VPN on a Palo Alto Networks firewall into the correct order.

Question 3

Drag and drop the steps to perform a packet capture (tcpdump) on a Palo Alto Networks firewall using the CLI into the correct order.

Question 4

Drag and drop the steps to configure a User-ID agent on a Palo Alto Networks firewall into the correct order.

Question 5

Drag and drop the steps to configure a VLAN interface on a Palo Alto Networks firewall into the correct order.

Question 6

A network engineer is troubleshooting a drop in traffic from a critical application. The traffic is allowed by the security policy, but the firewall is dropping the packets. The engineer views the session log and sees that the session is being terminated due to 'tcp-non-syn'. What is the most likely cause?

Accepted Answer

Asymmetric routing is causing packets to arrive at a firewall that did not see the initial SYN.. When a firewall sees a non-SYN TCP packet without having seen the initial SYN, it cannot validate the TCP three-way handshake state. This typically occurs with asymmetric routing, where the SYN traverses one firewall and subsequent packets arrive at a different firewall that lacks the session state. The firewall drops these packets with the 'tcp-non-syn' reason because it has no corresponding session entry to associate them with.

Answer

The TCP sequence numbers are out of order, causing the packets to be out of the expected window.

Answer

The NAT policy is misconfigured, causing the source IP to not be translated correctly.

Answer

The security policy uses an incorrect service object that doesn't match the application.

Question 7

A security engineer needs to ensure that all traffic from the internal network to the internet is inspected by the firewall. The firewall is deployed in layer 3 mode with virtual wire subinterfaces. Which configuration is required to achieve this?

Accepted Answer

Create a security policy rule that allows traffic from the internal zone to the external zone. Option A is correct because in a Layer 3 firewall deployment with virtual wire subinterfaces, traffic inspection is governed by security policy rules. A rule allowing traffic from the internal zone to the external zone ensures that all outbound traffic is evaluated and inspected by the firewall, as security policies are the primary mechanism for controlling and logging traffic in Palo Alto Networks firewalls.

Answer

Define a NAT policy to translate internal IPs to the external interface

Answer

Enable SSL decryption on the firewall

Answer

Configure a virtual wire between the internal and external interfaces

Question 8

A company has a PA-5250 firewall in an active/passive HA pair. During a maintenance window, the administrator upgrades the passive firewall from PAN-OS 10.0 to 10.1. After the upgrade, the passive firewall fails to synchronize with the active firewall. The active firewall remains at 10.0. What is the most likely cause?

Accepted Answer

The PAN-OS versions are different between the HA peers. PAN-OS requires both HA peers to run the same major version to synchronize configuration and state. The active firewall at PAN-OS 10.0 and the passive at 10.1 are incompatible, preventing HA synchronization. Even though the passive firewall was upgraded, the active firewall remains on the older version, breaking the HA session.

Answer

The HA2 link is down or misconfigured

Answer

The HA keepalive timer is misconfigured

Answer

The passive firewall has preemption enabled

Question 9

An organization is deploying a firewall in a high-availability (HA) pair. The administrator wants to ensure that session state is synchronized between the firewalls so that active sessions are not dropped during failover. Which configuration is required?

Accepted Answer

Enable Session Setup and State Synchronization under HA configuration. Option C is correct because session state synchronization (also known as stateful failover) requires enabling both Session Setup and State Synchronization under the HA configuration. This ensures that the active firewall's session table is continuously replicated to the passive firewall, so when a failover occurs, existing sessions are not dropped and can continue without interruption.

Answer

Configure HA1 and HA2 interfaces with appropriate IPs

Answer

Enable Config Sync on the HA General tab

Answer

Configure Path Monitoring to detect link failures

Question 10

A company has a firewall configured with multiple virtual routers. A user on a trusted network can ping the firewall's management IP but cannot reach an external server. The security policy allows the traffic. What is the most likely cause?

Accepted Answer

The virtual router does not have a default route to the external network.. The most likely cause is that the virtual router lacks a default route to the external network. Even though the security policy permits the traffic, the firewall must have a route in the virtual router's routing table to forward packets toward the destination. Without a default route, the firewall drops the traffic because it cannot determine the next hop for the external server's IP address.

Answer

A zone protection profile is blocking ICMP packets.

Answer

The decryption policy is blocking the traffic because it is not decrypted.

Answer

The NAT policy is missing for the outbound traffic.

PCNSA Quick Quiz — 10 Questions

Exhibit

PCNSA Quick Quiz — 10 Questions

Exhibit