Question: What components are required to be present in the Type of Service / Traffic Class and Mask attribute of a valid packet filter in GPRS networks?
Option 1: Either an IPv4 TOS octet or an IPv6 Traffic Class octet, accompanied by a mask specifying relevant bits for matching.
Option 2: Both an IPv4 TOS octet and an IPv6 Traffic Class octet, with a predefined default mask.
Option 3: Only a mask defining the 8 bits to be used for matching, without requiring either IPv4 TOS or IPv6 Traffic Class octets.
Option 4: A single, unified octet applicable to both IPv4 and IPv6, without the need for a mask.
Explanation: In GPRS networks, for efficient packet filtering, it's crucial to specify whether the filter is based on IPv4 (using Type of Service - TOS) or IPv6 (utilizing Traffic Class) protocols. Including a mask allows for flexibility in defining which bits of the octet are relevant for the filtering process, enhancing the precision of network traffic management.