Two computers, each with a single connection on the same physical 10 gigabit Ethernet network segment, need to communicate with each other. The first machine has a single Internet Protocol (IP)…

Question

Options

• ASince each computer is on a different layer 3 network, traffic between the computers must be
• BSince each computer is on the same layer 3 network, traffic between the computers may be
• CSince each computer is on the same layer 3 network, traffic between the computers may be
• DSince each computer is on a different layer 3 network, traffic between the computers must be

• A
  4% (1)
• B
  12% (3)
• C
  4% (1)
• D
  80% (20)

Explanation

The correct statement is that since each computer is on a different layer 3 network, traffic between the computers must be processed by a network router in order to communicate. Layer 3 is the network layer of the OSI model, which is responsible for providing logical addressing, routing, and packet delivery across different networks. Layer 3 uses protocols such as IP (Internet Protocol) to assign unique addresses to each device and to determine the best path for the packets to reach the destination. A network router is a device that operates at layer 3 and can connect and forward packets between different networks. A Classless Inter-Domain Routing (CIDR) notation is a way of representing an IP address and a subnet mask, which defines the size and range of the network. A CIDR notation consists of an IP address followed by a slash and a number, which indicates the number of bits that are used for the network portion of the address. The first machine has a single IP/CIDR address of 192.168.1.3/30, which means that the first 30 bits of the address are used for the network and the last 2 bits are used for the host. The network address of the first machine is 192.168.1.0 and the broadcast address is 192.168.1.3. The valid host addresses are 192.168.1.1 and 192.168.1.2. The second machine has an IP/CIDR address of 192.168.1.6/30, which means that the first 30 bits of the address are used for the network and the last 2 bits are used for the host. The network address of the second machine is 192.168.1.4 and the broadcast address is 192.168.1.7. The valid host addresses are 192.168.1.5 and 192.168.1.6. Since the network addresses of the two machines are different, they are on different layer 3 networks and cannot communicate directly with each other. They need a network router to forward the packets between the networks.

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