Which of the following is something you need to keep an eye out for
near packed intersections?
a. farm equipment
b. animals crossing
c. increased police presence
d. pedestrians ignoring don't walk signs

The open systems interconnection (osi) reference model: defines standards for many aspects of computing and communications within a network. is a generic description for how computers use multiple layers of protocol rules to communicate across a network. defines standards for wireless local area network (wlan) communication protocols. details the advantages and disadvantages of various basic network cabling options.