CAS-001 · Question #201
Wireless users are reporting issues with the company's video conferencing and VoIP systems. The security administrator notices DOS attacks on the network that are affecting the company's VoIP system…
The correct answer is C. Configure 802.11e on the network D. Update the firewall managing the SIP servers. VoIP DoS attacks cause premature call drops, garbled signals, and SIP server unavailability. Two controls address this: (C) IEEE 802.11e adds Quality of Service (QoS) to wireless networks, enabling traffic prioritization so VoIP/video packets are not dropped or degraded under…
Question
Wireless users are reporting issues with the company's video conferencing and VoIP systems. The security administrator notices DOS attacks on the network that are affecting the company's VoIP system (i.e. premature call drops and garbled call signals). The security administrator also notices that the SIP servers are unavailable during these attacks. Which of the following security controls will MOST likely mitigate the VoIP DOS attacks on the network? (Select TWO).
Options
- AConfigure 802.11b on the network
- BConfigure 802.1q on the network
- CConfigure 802.11e on the network
- DUpdate the firewall managing the SIP servers
- EUpdate the HIDS managing the SIP servers
How the community answered
(25 responses)- A8% (2)
- B16% (4)
- C72% (18)
- E4% (1)
Explanation
VoIP DoS attacks cause premature call drops, garbled signals, and SIP server unavailability. Two controls address this: (C) IEEE 802.11e adds Quality of Service (QoS) to wireless networks, enabling traffic prioritization so VoIP/video packets are not dropped or degraded under congestion or attack conditions - directly mitigating garbled calls and drops. (D) Updating the firewall managing the SIP servers adds rules to filter and block malicious traffic targeting SIP, preventing the servers from becoming unavailable. Option A (802.11b) is a legacy slow wireless standard with no QoS. Option B (802.1q) is VLAN tagging, not a DoS mitigation control. Option E (HIDS) is a Host-based Intrusion Detection System - it detects but does not actively prevent attacks.
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