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.
Fill shallow bowls of water with dish detergent. The water and dish detergent mixture is like a toxic swimming pool for fleas. When they jump into the mixture, they die. Place the water and detergent mixture in a very shallow bowl, low enough to the ground so that the fleas accidentally hop into it. An old frisbee does the job quite well.