Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved?

Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved?

• A. Destination IP addresses remain constant, and destination MAC addresses change on every LAN
• B. Source IP addresses are constant, and source MAC addresses change on every LAN
• C. Destination IP addresses change per segment, and source MAC addresses are constant
• D. Destination MAC addresses are constant, and source IP addresses change per segment

Answer: (A)

In the context of data transmission within a local area network (LAN) and in the absence of Network Address Translation (NAT), the first statement highlights a fundamental behavior of how IP and MAC addressing works. When data is transmitted over a network, the destination IP address remains constant regardless of how many segments the data passes through. This stability is due to the IP address being designed to identify a specific host on a network uniquely. As packets move through different network segments (or hops), the packet retains its destination IP address throughout the entire journey to the final host. However, destination MAC addresses do change as packets move from one LAN segment to another. Each device located on a LAN has a unique MAC address, which is used for local delivery within that specific network. When a data frame leaves a network and goes through different segments or devices, the source and destination MAC addresses will need to correspond to the devices involved in each network segment. As the data moves from one switch to the next or through a router, it requires the MAC address of the next hop, changing accordingly. In summary, during data transmission without NAT, destination IP addresses remain unchanged throughout the transmission, while destination MAC addresses are altered as each network segment is traversed. This pattern ensures that

In the context of data transmission within a local area network (LAN) and in the absence of Network Address Translation (NAT), the first statement highlights a fundamental behavior of how IP and MAC addressing works.

When data is transmitted over a network, the destination IP address remains constant regardless of how many segments the data passes through. This stability is due to the IP address being designed to identify a specific host on a network uniquely. As packets move through different network segments (or hops), the packet retains its destination IP address throughout the entire journey to the final host.

However, destination MAC addresses do change as packets move from one LAN segment to another. Each device located on a LAN has a unique MAC address, which is used for local delivery within that specific network. When a data frame leaves a network and goes through different segments or devices, the source and destination MAC addresses will need to correspond to the devices involved in each network segment. As the data moves from one switch to the next or through a router, it requires the MAC address of the next hop, changing accordingly.

In summary, during data transmission without NAT, destination IP addresses remain unchanged throughout the transmission, while destination MAC addresses are altered as each network segment is traversed. This pattern ensures that