200-201 · Question #180
What is indicated by an increase in IPv4 traffic carrying protocol 41 ?
The correct answer is D. attempts to tunnel IPv6 traffic through an IPv4 network. An increase in IPv4 traffic carrying protocol 41 specifically indicates attempts to tunnel IPv6 traffic through an IPv4 network.
Question
What is indicated by an increase in IPv4 traffic carrying protocol 41 ?
Options
- Aadditional PPTP traffic due to Windows clients
- Bunauthorized peer-to-peer traffic
- Cdeployment of a GRE network on top of an existing Layer 3 network
- Dattempts to tunnel IPv6 traffic through an IPv4 network
How the community answered
(35 responses)- A3% (1)
- B6% (2)
- C3% (1)
- D89% (31)
Why each option
An increase in IPv4 traffic carrying protocol 41 specifically indicates attempts to tunnel IPv6 traffic through an IPv4 network.
PPTP (Point-to-Point Tunneling Protocol) typically uses Generic Routing Encapsulation (GRE), which is IP protocol 47, not 41.
Protocol 41 does not inherently indicate unauthorized peer-to-peer traffic; it specifically denotes IPv6-in-IPv4 tunneling.
Deployment of a GRE (Generic Routing Encapsulation) network uses IP protocol 47, not 41.
Protocol 41 is the IP protocol number designated for IPv6 encapsulation within an IPv4 header, commonly used for tunneling IPv6 traffic over IPv4 networks, such as in 6to4 or ISATAP tunnels.
Concept tested: IPv6 over IPv4 tunneling (Protocol 41)
Source: https://learn.microsoft.com/en-us/windows/win32/winsock/internet-protocol-version-6-protocol-2
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