Cisco Certified Network Associate (CCNA) Practice Exam

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What is the EIGRP IPv4 multicast address?

  1. 224.0.0.5

  2. 224.0.0.10

  3. 239.255.255.255

  4. 192.168.1.1

The correct answer is: 224.0.0.10

The EIGRP (Enhanced Interior Gateway Routing Protocol) for IPv4 uses the multicast address 224.0.0.10. This address is specifically designated for routing protocols, allowing EIGRP routers to communicate efficiently without requiring point-to-point connections to each other. When an EIGRP router sends an update or hello packet, it utilizes this multicast address to ensure that all EIGRP-enabled devices in the same multicast group receive the messages. This approach enhances the efficiency and scalability of network communication in environments where multiple routers need to share routing information. The other addresses listed serve different purposes or are reserved for different protocols. For example, 224.0.0.5 is the multicast address for OSPF routers, while 239.255.255.255 is used for administratively scoped addresses, and 192.168.1.1 is a private IPv4 address typically used as a default gateway in home and small business networks.