TASK 3:

Answer the following questions:

1. Explain the concept of Firewall and where is it used?

2. What is VPN and why are there so many VPN service providers?

Answer:

3. Consider the following figure:

How many total interfaces are there in this network? What is the shortest path for packets to travel from PC (223.1.2.1) to PC (223.1.1.4)? Describe what would happen if the link between R2 and R1 went down. Would it still be possible to send and receive packets between devices?

Answer:

223.1.1.1 223.1.1.4 223.1.1.3 223.1.9.2 R1 223.1.7.0 223.1.9.1 223.1.7.1 R2 R3 223.1.8.1 223.1.8.0 223.1.2.6 223.1.3.27 223.1.2.1 223.1.2.2 223.1.3.1 223.1.3.2