Due to it's typically massive size, WAN's are almost always slower then a LAN. The further the distance, the slower the network. One of the big disadvantages to having a WAN is the cost it can incur. Having a private WAN can be expensive.
<span>A linear bus topology uses a common background cable to connect all network devices.</span>
A virus or malware appearing/pretending to be a legitimate program is called a Trojan.
Just select the fraction text and choose Open Type > Fractions from the Character panel menu.