SEO 面试题与答案

问题 21. What is ccTLD?

In SEO, ccTLD, also known as the country code top-level domain, is a domain extension reserved for a country and has two characters. Here are a few examples for ccTLD: .it for Italy and .in for India.

问题 22. What is PBN?

PBN or private blog network is a network of websites, which is built to link these websites to a single website for SERP ranking purposes. 

问题 23. What are SEO tools?

SEO tools analyze the performance of web pages and give insights for high placement on the SERP.

问题 24. Name some popular SEO tools.

• Google Search Console
• Google Analytics
• Moz
• Ahrefs
• SEMrush
• Screaming Frog
• Yoast SEO
• Ubersuggest
• Majestic SEO
• Serpstat
• SE Ranking
• Sprout Social
• SpyFu
• Buzzsumo
• Raven Tools
• KeywordTool.io

问题 25. Distinguish between a dofollow link and a nofollow link.

All hyperlinks are dofollow links by default unless specified as nofollow links. When search engine crawlers find a link, they crawl the page and pass the link juice as a vote of quality. The dofollow links from high-authority sites will help a site rank better in SERP by being quality backlinks.

Nofollow links are coded in a way that search engines do not crawl them or count them as votes of quality. You can use this when you want to link third-party sites on your website without passing the authority to those sites.