The utility netfilter and the command iptables provide support for NAT in Linux systems. Explain the relationship between the netfilter utility and the iptables command.
What will be an ideal response?
netfilter is an infrastructure; it is the basic API that the Linux kernel offers for applications that want to view and manipulate network packets. It adds the ability to set IP packet filters to a Linux system which can be used to add firewall as well as NAT functionality to a system. iptables is an interface that uses netfilter to classify and act on packets. It can thus be used to setup, maintain and inspect filter rules to a Linux kernel.
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Suppose the dictionary is randomly ordered. Asymptotically (that is, in terms of a likely Big-Oh running time), which of the following alterna tives is the fastest if we assume that no words are longer than ten char acters?
a. Sort the dictionary, and then use the algorithm in the text b. Sort the dictionary, but then use interpolation search c. Place the dictionary items in a binary search tree based map; the prefix test must be performed explicitly d. Place the dictionary items in a hash table based map; the prefix test must be performed explicitly e. Use a sequential search of the dictionary
List the subnets attached to Router C in Figure 8-12.
Figure 8-12
In the real world, you'll save the vast majority of your files as basic PSD documents
Answer the following statement true (T) or false (F)
The ________ property allows you to write a custom message when a validation rule has been violated
Fill in the blank(s) with correct word