Subnetting

Question 1

Which addresses are reserved for host addresses and broadcast adresses?

Answer 1

First address in network reserved for host address
Last address in network reserved for broadcast.

Example: Network can host 64 adresses. 62 are useable as Network ID is 0 and Broadcast ID is 63.

Question 2

When is it appropriate to use IP private addressing versus public addressing?

Answer 2

If workstations need data from other computers in their internal network they can use private IP addresses.

If they need something from the internet they will need to use NAT to obtain the data using the public IP address.

Question 3

What is the purpose of using a Network Address Translation (NAT) router?

Answer 3

NAT is used for internet access through a shared IP address.

Multiple computers in a private network can all share a single public IP address.

The computer sends their request to the firewall router which uses its public IP to contact the external server and returns the response to the internal computer.

Question 4

Does using a NAT router enhance or decrease security for an internal network

Answer 4

NAT provides limited security, external entities cannot initiate connections with computers in private network.

Not a replacement for a firewall

Each computer in private network still needs its own firewall