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The rdev commad is used to query/set an image root device, RAM disk size, or video mode. If a user executes the rdev commands with no arguments, it outputs a /etc/mtab line for the current root file system. The command syntax of the rdev command is as follows: rdev [ -Rrvh ] [ -o offset ] [ image [ value [ offset ] ] ] Answer: B is incorrect. In Unix, the rdump command is used to back up an ext2 filesystem. Answer: D is incorrect. In Unix, the mount command is used to mount a filesystem. Answer: C is incorrect. In Unix, the setfdprm command sets floppy drive parameters.

The major advantage that a table-structured Web site has over a frame-structured Web site is that users can bookmark the pages of a table- structured Web site, whereas pages of a frame-structured Web site cannot be bookmarked or added to the Favorites folder. Non-frame Web sites also give better results with search engines. Better navigation: Web pages can be divided into multiple frames and each frame can display a separate Web page. It helps in providing better and consistent navigation. Easy maintenance: Fixed elements, such as a navigation link and company logo page, can be created once and used with all the other pages. Therefore, any change in these pages is required to be made only once.

Following are the limitations of cross site request forgeries to be successful: Explanation: Following are the limitations of cross site request forgeries to be successful:

1. The attacker must target either a site that doesn't check the Referer header (which is common) or a victim with a browser or plugin bug that allows Referer spoofing (which is rare).

2. The attacker must find a form submission at the target site that does something useful to the attacker (e.g., transfers money, or changes the victim's e-mail address or password).

3. The attacker must determine the right values for all the form inputs: if any of them are required to be secret authentication values or IDs that the attacker can't guess, the attack will fail.

4. The attacker must lure the victim to a Web page with malicious code while the victim is logged in to the target site. Since, the attacker can't see what the target Web site sends back to the victim in response to the forged requests, unless he exploits a cross- site scripting or other bug at the target Web site.

Similarly, the attacker can only "click" any links or submit any forms that come up after the initial forged request, if the subsequent links or forms are similarly predictable. (Multiple "clicks" can be simulated by including multiple images on a page, or by using JavaScript to introduce a delay between clicks). from cross site request forgeries (CSRF) by applying the following countermeasures available: Requiring authentication in GET and POST parameters, not only cookies. Checking the HTTP Referer header. Ensuring there's no crossdomain.xml file granting unintended access to Flash movies. Limiting the lifetime of authentication cookies. Requiring a secret, user-specific token in all form submissions prevents CSRF; the attacker's site can't put the right token in its submissions. Individual Web users can do relatively little to prevent cross-site request forgery. Logging out of sites and avoiding their "remember me" features can mitigate CSRF risk; not displaying external images or not clicking links in "spam" or unreliable e-mails may also help.

In order to connect a client computer to a secured Wireless LAN (WLAN), you are required to provide the following information: SSID of the WLAN WEP key rticlesItemsReportsHelp