294. Which of the following improve security of an IP Telephony solution from common threats? (Select TWO)
A. Implement Access Control Lists (ACL) at the access switches and distribution switches.
B. Enable port security or 802.1x authenticator at the access switches.
C. Disable Spanning Tree Protocol (STP) at the edge switches.
D. Enable port security or 802.1x authenticator at the distribution switches.
E. Enable Network Address Translation (NAT) to be provided for all IP Telephony components.
Answer: AB
295. Several users at a company have H. 323 softphones on laptops on a data VLAN. The IP Telephony components are segregated on a dedicated VLAN for voice. Which of the following ports should be opened at the firewall between the two VLANs? (Select TWO)
A.
B. The TCP port range of the RTP channels
C. TCP 1719
D. UDP 1720
E. UDP 1719
F. TCP 1720
Answer: EF
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