Final answer:
The forwarding table in router A would include an entry that matches the IP address of host H₃ and specifies that traffic for this destination should be forwarded through interface 3.
Step-by-step explanation:
To show the forwarding table in router A such that all traffic destined to host H₃ is forwarded through interface 3, we would need to configure a routing rule that matches the IP address of host H₃. The entry in the forwarding table would specify that any packet with a destination IP that matches host H₃'s IP address should be sent to interface 3.
A simplified example of a forwarding table entry could be:
- Destination IP: The IP address of host H₃
- Subnet Mask: Depending on the network design, could be 255.255.255.0 for a typical class C subnet
- Interface: 3
This would ensure that when router A receives a packet destined for H₃, it uses interface 3 to forward the packet.