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What is indicated by an increase in IPv4 traffic carrying protocol 41 ?

A.

additional PPTP traffic due to Windows clients

Answers
A.

additional PPTP traffic due to Windows clients

B.

unauthorized peer-to-peer traffic

Answers
B.

unauthorized peer-to-peer traffic

C.

deployment of a GRE network on top of an existing Layer 3 network

Answers
C.

deployment of a GRE network on top of an existing Layer 3 network

D.

attempts to tunnel IPv6 traffic through an IPv4 network

Answers
D.

attempts to tunnel IPv6 traffic through an IPv4 network

Suggested answer: D

Explanation:

Protocol 41 is used to encapsulate IPv6 packets in IPv4 headers for transmission over an IPv4 network. This is one of the methods to implement IPv6 transition mechanisms for hosts and routers that are located on IPv4 networks. An increase in IPv4 traffic carrying protocol 41 may indicate that some hosts or routers are trying to tunnel IPv6 traffic through an IPv4 network, which could be a legitimate or malicious activity depending on the network policy.Reference:=Understanding Cisco Cybersecurity Operations Fundamentals (CBROPS) - Cisco, page 177; [IPv6 Transition Mechanisms for IPv4 Domains]

asked 07/10/2024
dennis schouwenaars
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