Isolate IPv4 from IPv6 Traffic: Network Segments and Risks
Question
A company is not familiar with the risks associated with IPv6
The systems administrator wants to isolate IPv4 from IPv6 traffic between two different network segments.
Which of the following should the company implement? (Choose two.)
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D. E. F.AC.
The objective is to isolate IPv4 from IPv6 traffic between two different network segments. Let's take a look at the options provided:
A. Use an internal firewall to block UDP port 3544. UDP port 3544 is used by the Teredo tunneling protocol, which is used to encapsulate IPv6 traffic within IPv4 packets. By blocking this port, we can prevent the use of Teredo and thereby limit IPv6 traffic. This option can be considered as a possible solution.
B. Disable network discovery protocol on all company routers. This option is not relevant to the objective of isolating IPv4 from IPv6 traffic between two different network segments. Network discovery protocols are used to identify and communicate with devices on the same network segment.
C. Block IP protocol 41 using Layer 3 switches. Protocol 41 is used by IPv6-in-IPv4 tunneling protocols such as 6to4 and ISATAP. By blocking this protocol, we can prevent IPv6 traffic from being tunneled over IPv4. This option can be considered as a possible solution.
D. Disable the DHCPv6 service from all routers. DHCPv6 is used to assign IPv6 addresses and configuration parameters to devices on a network. Disabling DHCPv6 would prevent IPv6 devices from obtaining an IPv6 address and configuration information. This option is not relevant to the objective of isolating IPv4 from IPv6 traffic.
E. Drop traffic for ::/0 at the edge firewall. The IPv6 address ::/0 is equivalent to the IPv4 address 0.0.0.0/0, which represents all possible IPv6 addresses. By dropping this traffic at the edge firewall, we can prevent all IPv6 traffic from entering the network. This option is not a suitable solution since it will block all IPv6 traffic, not just between the two network segments.
F. Implement a 6in4 proxy server. A 6in4 proxy server is used to encapsulate IPv6 traffic within IPv4 packets, allowing IPv6 traffic to be transmitted over an IPv4 network. This option is not relevant to the objective of isolating IPv4 from IPv6 traffic between two different network segments.
In summary, options A and C can be considered as possible solutions. Blocking UDP port 3544 and IP protocol 41 can limit the use of IPv6 within the network, without affecting the IPv4 traffic.
