PALO ALTO NETWORKS PCNSE EXAM | RELIABLE PCNSE EXAM TIPS - ASSIST YOU CLEAR PCNSE: PALO ALTO NETWORKS CERTIFIED NETWORK SECURITY ENGINEER EXAM EXAM

Palo Alto Networks PCNSE Exam | Reliable PCNSE Exam Tips - Assist you Clear PCNSE: Palo Alto Networks Certified Network Security Engineer Exam Exam

Palo Alto Networks PCNSE Exam | Reliable PCNSE Exam Tips - Assist you Clear PCNSE: Palo Alto Networks Certified Network Security Engineer Exam Exam

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Palo Alto Networks Certified Network Security Engineer Exam Sample Questions (Q154-Q159):

NEW QUESTION # 154
If the firewall has the link monitoring configuration, what will cause a failover?

  • A. ethernet1/3 going down
  • B. ethernet1/6 going down
  • C. ethernet1/3 and ethernet1/6 going down
  • D. ethernet1/3 or Ethernet1/6 going down

Answer: C


NEW QUESTION # 155
After switching to a different WAN connection, users have reported that various websites will not load, and timeouts are occurring. The web servers work fine from other locations.
The firewall engineer discovers that some return traffic from these web servers is not reaching the users behind the firewall. The engineer later concludes that the maximum transmission unit (MTU) on an upstream router interface is set to 1400 bytes.
The engineer reviews the following CLI output for ethernet1/1.

Which setting should be modified on ethernet1/1 to remedy this problem?

  • A. Lower the interface MTU value below 1500.
  • B. Enable the Ignore IPv4 Don't Fragment (DF) setting.
  • C. Adjust the TCP maximum segment size (MSS) value. *
  • D. Change the subnet mask from /23 to /24.

Answer: C

Explanation:
Explanation
The engineer should adjust the TCP maximum segment size (MSS) value on ethernet1/1 to remedy this problem. This is because the MTU on an upstream router interface is set to 1400 bytes, which is causing the return traffic from the web servers to not reach the users behind the firewall. By adjusting the TCP MSS value, the engineer can ensure that the return traffic is able to reach the users without any issues.
The TCP MSS is the maximum amount of data that can be transmitted in a single TCP segment, excluding the TCP and IP headers. The TCP MSS is usually derived from the MTU of the underlying network, which is the maximum packet size that can be transmitted without fragmentation. For example, if the MTU is 1500 bytes, which is the default value for ethernet interfaces, then the TCP MSS is 1460 bytes (1500 - 20 bytes for IP header - 20 bytes for TCP header). However, if there are intermediate devices or networks that have a lower MTU than the end-to-end path, then the TCP MSS may need to be adjusted accordingly to avoid packet loss or fragmentation1.
In this case, the firewall has an MTU of 1500 bytes on ethernet1/1, which is connected to a WAN link.
However, an upstream router has an MTU of 1400 bytes on its interface, which means that any packet larger than 1400 bytes will be either dropped or fragmented by the router. This can cause problems for the return traffic from the web servers, which may have a TCP MSS of 1460 bytes or higher, depending on their MTU settings. If these packets have the Don't Fragment (DF) bit set in their IP header, which is common for TCP packets, then they will be dropped by the router and never reach the firewall or the users behind it. If they do not have the DF bit set, then they will be fragmented by the router and reassembled by the firewall, which can cause performance degradation and overhead2.
To avoid these problems, the engineer should adjust the TCP MSS value on ethernet1/1 to match or be lower than the MTU of the upstream router. This can be done by using the CLI command set network interface ethernet ethernet1/1 tcp-mss <value> , where <value> is an integer between 64 and 15003. For example, if the engineer sets the TCP MSS value to 1360 bytes (1400 - 20 - 20), then this will ensure that any TCP packet sent or received by ethernet1/1 will not exceed 1400 bytes in total size, and thus will not be dropped or fragmented by the router. This will allow the return traffic from the web servers to reach the users behind the firewall without any issues4.
References: TCP Maximum Segment Size (MSS), Configure Session Settings, TCP MSS Adjustments, PCNSE Study Guide (page 59)


NEW QUESTION # 156
An administrator needs to optimize traffic to prefer business-critical applications over non-critical applications.
QoS natively integrates with which feature to provide service quality?

  • A. Port Inspection
  • B. Content-ID
  • C. App-ID
  • D. Certificate revocation

Answer: C

Explanation:
Explanation/Reference:
Reference: https://www.paloaltonetworks.com/documentation/80/pan-os/pan-os/quality-of-service/qos- concepts/qos-for-applications-and-users#idaed4e749-80b4-4641-a37c-c741aba562e9


NEW QUESTION # 157
A speed/duplex negotiation mismatch is between the Palo Alto Networks management port and the switch port to which it connects.
How would an administrator configure the interface to 1Gbps?

  • A. set deviceconfig system speed-duplex 1Gbps-duplex
  • B. set deviceconfig Interface speed-duplex 1Gbps-half-duplex
  • C. set deviceconfig interface speed-duplex 1Gbps-full-duplex
  • D. set deviceconfig system speed-duplex 1Gbps-full-duplex

Answer: D

Explanation:
Explanation/Reference: https://live.paloaltonetworks.com/t5/Configuration-Articles/How-to-Change-the-Speed-and-Duplex- of-the-Management-Port/ta-p/59034


NEW QUESTION # 158
To connect the Palo Alto Networks firewall to AutoFocus, which setting must be enabled?

  • A. Device> Setup>Management >AutoFocus
  • B. Device>Setup>Services>AutoFocus
  • C. Device>Setup>WildFire>AutoFocus
  • D. AutoFocus is enabled by default on the Palo Alto Networks NGFW
  • E. Device>Setup> Management> Logging and Reporting Settings

Answer: A

Explanation:
Reference: https://www.paloaltonetworks.com/documentation/71/pan-os/pan-os/getting-started/enable- autofocus-threat-intelligence


NEW QUESTION # 159
......

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