Palo Alto Networks PAN-OS allows administrators to configure the maximum number of concurrent sessions for each individual administrative account. This setting is located in the web interface under Device > Setup > Management > General Settings. The configurable range for "Max Concurrent Logins per Administrator" is from 1 to 10, with a default value of 10. Therefore, the maximum volume of concurrent sessions for a single administrative account is 10. This feature helps enforce security policies by limiting the simultaneous use of a single set of credentials.

A. Unlimited: This is incorrect. PAN-OS enforces a specific upper limit for concurrent administrative sessions for security and system stability.

B. 2: This is incorrect. While '2' is a valid number within the configurable range (1-10), it is not the maximum possible value.

D. 1: This is incorrect. This is the minimum configurable value, which would prevent any concurrent sessions, not the maximum.

1. Palo Alto Networks. (2023). PAN-OS® Administrator’s Guide 11.0. "Device > Setup > Management". In the Management Interface Settings table

the entry for "Max Concurrent Logins per Administrator" states

"Enter the maximum number of concurrent sessions allowed for each administrator (range is 1-10; default is 10)."

2. Palo Alto Networks. (2022). PAN-OS® Administrator’s Guide 10.2. "Reference: Web Interface and CLI". Section: "Device > Setup > Management". The description for "Max Concurrent Logins per Administrator" specifies the range as 1 to 10.