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The nofollow attribute is a hypertext markup language (HTML) value which instruct some search engines that a hyperlink ought not influence the link target's ranking in the search engine's index. The intention of the nofollow attribute is to reduce the effectiveness of certain types of search engine spam, thus improving the quality of search engine results and preventing spamdexing from occurring. Spamdexing is where a website manipulates its prominence or relevancy of resources indexed by a search engine; this manor if inconsistent with the purpose of the search engine indexing system. read more.A packet sniffer (otherwise known as a network analyzer) can capture traffic on all or just parts of a network from a single machine within the network. This is achievable on wired broadcast local area networks (LANs) depending on the network structure. Although, there are certain methods which avoid traffic narrowing used by switches to gain access to traffic from other systems on the network (such as ARP spoofing). With regards to network monitoring purposes it can also be desirable to monitor all data packets in a local area network by using a network switch with monitoring port. The purpose of this is to mirror all packets passing through all ports of the switch when computers are connected to a switch port. Packet sniffing is also achievable on wireless LANs, where one can capture traffic on a particular channel. read more.
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