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The robots exclusion standard is a tool used by a webmaster to direct a web crawler not to crawl all or specified parts of their website. The webmaster places their request in the form of a robots.txt file that is easily found on their website
FOR MORE :
https://support.archive-it.org/hc/en-us/articles/208001096-Avoid-robots-txt-exclusions
ROLL NO :1514122

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Website generally use third party providers which have CAPTCHA or someother Turing tests to defend against such bots if they find anomalous behavious. You might have at times come across CAPTCHA when refreshing a website too many times.

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The meta tag can be used to disallow or no-index.  Also sitemap is very useful. A crawler will follow that and index accordingly.

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Have your server reject a large series of requests from the same IP address in a given time period. Google is very effective at this -- if you attempt to crawl any of their search results they'll block your ip after about 30 seconds. Block requests with HTTP headers from certain user agents. You can do this by creating a robots.txt file.
Hide content behind something that forces human involvement like a CAPTCHA. Pull important content to the page after it loads with AJAX. Watermark your content so it will be easy to tell its yours on other pages.

Roll no: 1514101

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The robots exclusion standard is a tool used by a webmaster to direct a web crawler not to crawl all or specified parts of their website. The webmaster places their request in the form of a robots.txt file that is easily found on their website (example.com/robots.txt). Nevertheless, there are some web crawlers that ignore this robots.txt file.

To limit access to your site for everyone else, .htaccess is better, but you would need to define access rules, by IP address for example.

Below are the .htaccess rules to restrict everyone except your people from your company IP:

Order allow,deny
# Enter your companies IP address here
Allow from 255.1.1.1
Deny from all

Roll No :- 1514119

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is just one of over 200 major factors that go into the Hummingbird algorithm.

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If a web crawler ignores the robot.txt file and crawls the entire website than one can use .htaaccess to block those web crawlers and we can redirect IP addresses or user agents . Secondly we can also use noindex meta tag to not allow web crawlers to crawl on unwanted pages . We can also make use of robot exclusion standard tool. Even web crawler traps can be implemented in your websites to prevent crawlers from crawling on unnecessary pages.

Roll no: 1624006

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If a crawler ignores the robots.txt ,we catch it with the robot trap:Make a special directory that has only one file,this directory is mentioned only in the robots.txt file.Any access to it must be by either surfing the net or by robot.If the robot ignores the robots.txt file,it will access it .Here we can place certain commands to trap it.

Roll no:1514094

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In the robot.txt file disallow all crawlers, except a handful of useful ones.
Use .htaccess to hard-block over-anxious spiders and crawlers.The .htaccess is a (hidden) file which can be found in any directory.  Redirect web requests coming from certain IP addresses or user agents.  Block the active crawlers/bots by catching a string in the USER_AGENT field, and redirect their web requests to a “403 – Forbidden”, before the request even hits your web server.

Roll No: 1514112

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The robot.txt file simply gives the crawler a list of pages to crawl or not crawl. This can be ignored by crawlers. It can be done by the seed method using the 'Ignore robots.txt' or by host-by-host basis. The exclusion tools standards available block the crawler from visiting the pages that you wish. You could also prevent crawlers from completely viewing the link by using the 'noindex' in meta tag as the crawler would still read the title (existence
of the page) but will not be able to crawl it. This would prevent it from being searched. In this case we need not 'disallow' the page in robot.txt.
Roll No: 1624007

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Ways to deal with web crawler that completely ignore robot.txt and crawls the entire website are :
1.  Use nonindex meta directive
2.  Use of crawler traps which block IP and inform the web masters
3. use of robot exclusion standard tool

Roll Number : 1514099

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Use of robot.txt file to prevent or secure sensitive data ( like user login credentials) is not recommended. Because other pages may have link of the page which is not to be crawled and having private information, thus bypassing the robot.txt directives, it may still get crawled. If you want to avoid this, use different methods like password protection or the nonindex meta directive.

Roll No.: 1624017

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ile is there to tell crawlers and robots which URLs they should not visit on your website. This is important to

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The robots.txt files are merely GUIDES for the Search engine bots. They are not required to follow the robots.txt file.
So if you do not want the web crawlers to crawl through your website, you can always use robots exclusion standard.
It is a tool that is used by webmaster to tell the web crawler to not crawl through your website.
You can also do this by enabling 'Ignore robot.txt' feature which can override robots exclusions.
If a web master notices that a crawler is crawling through your pages which they told not to, they will block its IP address from visiting
You can also block by IP address,based on User agent string or by refer using .htaccess file

Roll No- 1624001

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The robots exclusion standard is a tool used by a webmaster to direct a web crawler not to crawl all or specified parts of their website. The webmaster places their request in the form of a robots.txt file  that is easily found on their website. Archive-It (like Google and most other search engines) uses a robot to crawl and archive web pages. By default, our crawler honors and respects all robots.txt exclusion requests. However on a case by case basis, you can set up rules to ignore robots.txt blocks for specific sites.

Roll No-1514102

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Malware robots that scan the web for security vulnerabilities, and email address harvesters used by spammers will pay no attention to robot.txt file and which crawl the webpages even if they are disallowed to do so.

However there are some sites that have crawler traps, links hidden for the normal user but plainly visible for crawlers. These traps can IP block those crawlers or do anything really to try and thwart the crawler

Also if a web master notices crawler crawling pages that they told not to crawl, they might contact and tell it to stop, or even block its IP address from visiting, but then that's a rare occurrence.

Roll No: 1624002

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Ignore robots.txt by host

Once the "Ignore robots.txt" feature has been enabled for your account, you can also override robots exclusions in your collection on a host-by-host basis. To ignore all robots.txt blocks on hosts that appear anywhere during the course of your crawls, navigate to the "Collection Scope" tab of your collection's management area, select "Ignore Robots.txt" from the drop-down menu, add the hosts to which you would like to apply this new rule (exactly as they appear in your Host report), and click the "Add Rule" button to apply it to your seed's future crawls
Roll No: 1514126

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Robots.txt is a text file webmasters create to instruct web robots (typically search engine robots) how to crawl pages on their website. The robots.txt file is part of the the robots exclusion protocol (REP), a group of web standards that regulate how robots crawl the web, access and index content, and serve that content up to users.   The robot.txt file is there to tell crawlers and robots which URLs they should not visit on your website. This is important to help them avoid crawling low quality pages, or getting stuck in crawl traps where an infinite number of URLs could potentially be created, for example, a calendar section which creates a new URL for every day.

Roll No: 1514115

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Website owners, can instruct search engines on how they should crawl a website, by using a robots.txt file.

When a search engine crawls a website, it requests the robots.txt file first and then follows the rules within.

It's important to know robots.txt rules don't have to be followed by bots, and they are a guideline.
For instance to set a Crawl-delay for Google this must be done in the Google Webmaster tools.

For bad bots that abuse your site you should look at how to block bad users by User-agent in .htaccess.

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Once the "Ignore robots.txt" feature has been enabled for your account, you can override robots exclusions in your crawl on a seed-by-seed basis. To ignore all robots.txt blocks on hosts captured from a specific seed (including the seed host, and any host embedded content is coming from), click on the specific seed from your collection's seed list, followed by the "Seed Scope" tab, select "Ignore Robots.txt" from the drop-down menu, and click the "Add Rule" button to apply it to your seed's future crawls.

Roll No:- 1514125