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次のファイアウォール ルールのうち、問題の原因となる可能性が最も高いのはどれですか?
正解:B
The firewall rules are set to deny any traffic from any source to specific destination IP addresses on any port.
The destination IP addresses are in different ranges, but one of them is in the multicast range of 224.0.0.0 to 239.255.255.25512.
The multicast range is used to send data to multiple recipients at once, such as streaming video or audio34.
The multicast server on the network is likely using an IP address in the multicast range to broadcast its data to the clients.
Therefore, the firewall rule that is most likely causing the issue is the one that denies any traffic to the IP address 232.1.4.9, which is in the multicast range.
The other rules are not likely to affect the multicast server, unless it is using one of those IP addresses as well.
Reference:
CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Protocols and Services, page 51.
Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.1: Common TCP and UDP Ports, page 15.
CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Protocols and Services, pages 53-54.
Professor Messer's CompTIA N10-008 Network+ Training Course, Video 2.1: Common TCP and UDP Ports, 6.