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200-201 · Question #180
200-201 Question #180: Real Exam Question with Answer & Explanation
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.
Submitted by kwame.gh· Mar 6, 2026Network Intrusion Analysis
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
Explanation
An increase in IPv4 traffic carrying protocol 41 specifically indicates attempts to tunnel IPv6 traffic through an IPv4 network.
Common mistakes.
- A. PPTP (Point-to-Point Tunneling Protocol) typically uses Generic Routing Encapsulation (GRE), which is IP protocol 47, not 41.
- B. Protocol 41 does not inherently indicate unauthorized peer-to-peer traffic; it specifically denotes IPv6-in-IPv4 tunneling.
- C. Deployment of a GRE (Generic Routing Encapsulation) network uses IP protocol 47, not 41.
Concept tested. IPv6 over IPv4 tunneling (Protocol 41)
Reference. https://learn.microsoft.com/en-us/windows/win32/winsock/internet-protocol-version-6-protocol-2
Topics
#protocol 41#IPv6 tunneling#network protocols#traffic analysis
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