Question: In GPRS Tunnelling Protocol User Plane (GTPv1-U), what is the specified UDP destination port for transmitting Error Indication messages, considering firewall configurations in network deployments?
Option 1: 2123 - A commonly used port for general GTP signaling
Option 2: 179 - Typically associated with BGP (Border Gateway Protocol) routing
Option 3: 2152 - The user plane UDP port designated for GTPv1-U Error Indications
Option 4: 8080 - A frequently used port for HTTP proxy and other web services
Explanation: In the context of GTPv1-U, specifically for Error Indication messages, using the correct UDP destination port is crucial for ensuring these messages are properly routed through the network, including passing through stateful firewalls that may not be GTP-aware. The designated user plane UDP port, 2152, facilitates this requirement, highlighting the importance of standardized port usage in telecommunications for reliable message transmission and network configuration.