1. Given a network with a slash format of /27, what is its corresponding network mask?
2. What is the method that encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 network?
3. For a PC with an IP address of 199.16.1.77/27, what is its subnet address?
4. For a PC with an IP address of 199.16.1.21/30, what is its broadcast address?