A telecommunication company has recently upgraded their teleconference systems to multicast. Additionally, the security team has instituted a new policy which requires VPN to access the company's…

IPSec transport mode encrypts only the payload rather than encapsulating the entire packet as tunnel mode does, which reduces overhead and would not increase bandwidth utilization.

Disabling ICMP reduces traffic by blocking ping and related control messages, which would decrease rather than increase bandwidth utilization.

With split tunneling disabled, every packet from a remote user - including general internet traffic - must traverse the VPN concentrator. During multicast video conferences, this means all video stream traffic from every participant is routed through the concentrator, significantly increasing its bandwidth utilization. Enabling split tunneling would allow internet-bound traffic to exit locally, reducing concentrator load.

NAT-traversal (NAT-T) encapsulates IPSec traffic in UDP to traverse NAT devices; while it adds minor overhead, it is an enablement feature and does not substantially increase bandwidth on the concentrator during meetings.