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Exam 300-420 topic 1 question 98 discussion

Actual exam question from Cisco's 300-420
Question #: 98
Topic #: 1
[All 300-420 Questions]

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

  • A. encapsulation of traffic with GRE or VTI
  • B. IPsec forwarding using transport mode
  • C. additional bandwidth for headend
  • D. IPsec forwarding using tunnel mode
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Suggested Answer: A 🗳️
by Lungful at Aug. 18, 2023, 6:23 p.m.

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rted
10 months ago
Dynamic routing protocols rely on using IP multicast or broadcast packets, but IPsec does not support encrypting multicast or broadcast packets. The current method for solving this problem is to use generic routing encapsulation (GRE) tunnels in combination with IPsec encryption. https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/41940-dmvpn.html
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salmarin
1 year, 3 months ago
Selected Answer: A
IPSec does not allow to transmit Multicast and Broadcast traffic via a IPSec VPN, so we should use GRE.
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Lungful
1 year, 8 months ago
Selected Answer: A
A is correct. IPsec does not natively support multicast traffic so encapsulation via GRE is commonly used.
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