Whistle Blowing System. A sound whistle blowing system is a critical component of good corporate governance. While public companies are required to meet SOX whiste blowing standards, private organizations, as well as small businesses, have also followed suit.
Wireless local area network channels using IEEE 802.11 protocols are sold mostly under the trademark WiFi. The 802.11 workgroup has documented use in five distinct frequency ranges: 2.4 GHz, 3.6 GHz, 4.9 GHz, 5 GHz, and 5.9 GHz bands. Each range is divided into a multitude of channels. Countries apply their own regulations to the allowable channels, allowed users and maximum power levels within these frequency ranges.
However, a possible answer is 2 or more, that is the number of LAN interfaces that appears as outgoing interfaces/next-hops. The serial interface is a separate broadcast domain / IP subnet but it is point to point link. Nothing can be said about the remote IP subnets we can guess that IP subnet 192.168.90.0/24 belongs to a LAN interface of another router. This can be counted as the third broadcast domain.