Solution

Correct Answer: unicast address

• In computer networking, there are three types of addresses used to identify devices: unicast, multicast, and broadcast. Each type of address has a specific purpose and is used for different types of communication.
• A unicast address is a unique address assigned to a single device on a network. When a device wants to send a packet of data to another device, it uses the unicast address of the target device as the destination address. The packet is then sent over the network and is only delivered to the device with the matching unicast address.
• A multicast address is used to send a single data frame to multiple devices simultaneously. This is useful when a device wants to send a message to a group of devices, such as a video stream to a group of viewers. In this case, the sender uses a multicast address as the destination address, and the message is delivered to all devices that have joined the multicast group.
• A broadcast address is used to send a data frame to all devices on a network. This is useful for communication that should be received by every device on the network, such as a request for all devices to respond with their IP addresses. In a broadcast transmission, the destination address is set to the broadcast address of the network, and all devices on the network receive the message.
• In IPv6, the first 3 bits of an address determine the type of address. If the first 3 bits are 001, the address is a unicast address. If the first 3 bits are 111, the address is a multicast address. Broadcast addresses do not exist in IPv6.

So, to summarize, the destination address 4A ∶ 30 ∶ 10 ∶ 21 ∶ 10 ∶ 1A is a unicast address because its first 3 bits are 010, indicating that it is a unique address assigned to a single device on a network. This address is used for communication between two specific devices, and the data frame is only delivered to the device with this exact address.