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Review Quiz

1:How does firewall service in Mac OS X Server prevent unwanted visitors from accessing the server?
2:What are firewall address groups used for?
3:If you have multiple firewall rules that could potentially apply to a given IP address, what determines which rule is applied first?
4:Describe NAT. What does it do? What purpose does it serve? What are its drawbacks?
5:Which form of NAT is supported in Server Admin?
6:Which tool can you run to view the routing tables after a VPN setup?
7:Name the two transport protocols used in VPN.


A1: The firewall service checks the IP address of any request for service before allowing access. This prevents requests from unwanted guests from reaching any server services, if the firewall is configured correctly.
A2: You can use these groups to organize and target the firewall rules. Groups allow you to apply rules to a predefined set of IP addresses.
A3: The most specific rule applies. A rule applied to a single IP address is the most specific, and smaller IP ranges are more specific than larger IP ranges.
A4: NAT is a way to provide Internet access to multiple IP clients using only a single IP address that is valid on the Internet. It is used to give a small workgroup of machines access to the Internet without needing an Internet IP address for every client. Its primary drawbacks are that it makes it difficult for computers on the Internet to find computers on the NAT network, since the NAT computers don't have valid Internet IP addresses (although this can be interpreted as a security-enhancing feature).
A5: Server Admin supports Port Address Translation (PAT), which maps multiple private IP addresses to a single public one using different ports. PAT is also known as port overloading, single address NAT, and port-level multiplexed NAT.
A6: netstat
A7: Layer Two Tunneling Protocol (L2TP) and Point-to-Point Tunneling Protocol (PPTP).

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