An IP Gateway is needed to provide the communications between your computer and the World Wide Web. A Network Switch can send the data, or packets, to the intended computer because of the capabilities of an IP Gateway Router.
What is a Sea Flea? There is much confusion about what people mean when they refer to a sea flea. While there is a marine creature of the Leptostraca family found in the waters around Australia that is called a sea flea, more often the term is actually used to describe the jellyfish larvae that can make sea bathers break out is a rash.
There are a number of different fleas that have a preference for different species of mammals. Human fleas (Pulex irritans) do not live on humans but prefer to feed on people and pigs when the opportunity arises. However, this type of flea is usually not responsible for flea infestations in the home. It is the cat flea and sometimes the dog flea that more often causes home infestations.