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.

Computer Science & Information Technology

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Assume that transactions are executed at REPEATABLE READ. Give an example in which an UPDATE statement executed by one transaction causes a phantom in an UPDATE statement executed in another.

What will be an ideal response?

Computer Science & Information Technology

Fortran, Pascal, BASIC and C are all forms of ________.

a) concurrent programming languages b) procedural programming languages c) object-oriented programming languages d) none of the above

Computer Science & Information Technology

Use the ________ key to select A5:A8 and D5:D8

A) $ B) Alt C) Shift D) Ctrl

Computer Science & Information Technology

Which component of the acl definition functions as an identifier when the condition is used in an http_access statement?

A. acl_name B. acl_type C. acl_string D. acl_identifier

Computer Science & Information Technology