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To protect a VoIP infrastructure against a denial-of-service (DoS) attack, it is MOST important to secure the:

To protect a VoIP infrastructure against a denial-of-service (DoS) attack, it is MOST important to
secure the:

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A.
access control servers.

B.
session border controllers.

C.
backbone gateways.

D.
intrusion detection system (IDS).

Explanation:

Session border controllers enhance the security in the access network and in the core. In the
access network, they hide a user’s real address and provide a managed public address. This
public address can be monitored, minimizing the opportunities forscanning and denial-of-service
(DoS) attacks. Session border controllers permit access to clients behind firewalls while
maintaining the firewall’s effectiveness. In the core, session border controllers protect the users
and the network. They hide network topology and users’ real addresses. They can also monitor
bandwidth and quality of service. Securing the access control server, backbone gateways and
intrusion detection systems (IDSs) does not effectively protect against DoS attacks.


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