Which two statements describe the functions of Session Border Controllers? (Choose two.)
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A. B. C. D. E.AE.
Session Border Controllers (SBCs) are specialized devices that are deployed at the edge of a network to provide secure and reliable voice and multimedia communication services over IP networks. They act as intermediaries between two or more communication endpoints, providing a range of functions that enable the successful initiation, management, and termination of communication sessions across network borders.
The correct answers to the question are B and E.
B. SBCs are session-aware devices that enable control of end-to-end interactive communications across IP network borders.
SBCs are designed to be session-aware, meaning that they have knowledge of the signaling and media information related to a communication session. This allows them to control and monitor the end-to-end flow of traffic, ensuring that communication sessions are established and maintained successfully, even when they cross network borders. SBCs provide functions such as protocol normalization, security, and quality of service (QoS) management to ensure that communication sessions are delivered reliably and securely.
E. SBCs provide signaling proxy functions for SIP, H.323, and MGCP, which includes access control, signaling constraints, and topology hiding.
SBCs provide signaling proxy functions for popular voice and multimedia communication protocols such as Session Initiation Protocol (SIP), H.323, and Media Gateway Control Protocol (MGCP). These functions include access control, signaling constraints, and topology hiding. Access control enables SBCs to restrict access to the network and control who can establish communication sessions. Signaling constraints allow SBCs to regulate the flow of signaling messages, ensuring that only valid messages are processed and forwarded. Topology hiding ensures that the internal network topology is not exposed to external parties, enhancing the security of the network.
A. Incorrect statement: SBCs do not replace typical edge routers and firewalls in order to provide a unified network border for signaling and media control.
SBCs are typically deployed alongside edge routers and firewalls, providing additional functions that are not provided by these devices. Edge routers and firewalls are designed to manage network traffic at the IP level, while SBCs are specialized devices that manage traffic at the session level, providing additional security and control functions for voice and multimedia communications.
C. Incorrect statement: SBCs are not based on the Windows operating system.
SBCs are typically based on specialized hardware platforms and operating systems that are optimized for their specific functions. They are not based on general-purpose operating systems such as Windows.
D. Incorrect statement: SBCs do not provide routing functions for IP, TCP, and SMTP using application parameters.
SBCs do not provide routing functions for IP, TCP, and SMTP using application parameters. These functions are typically provided by edge routers and firewalls. SBCs focus on the management and control of session-level traffic, providing additional security and control functions for voice and multimedia communications.