CCNA Data Center DCICN 640-911 Official Cert Guide

Chapter 6

1. C and D. 10BASE-5 and 10BASE-2 both used cabling that ran close to each device, much like a bus drives past each bus stop, so that these early Ethernet technologies were considered to be a physical bus topology. These technologies also used a single electrical circuit, so that a frame sent by a device passed to each other device on the bus, again mimicking a bus route, so that the network industry also referred to the logic as a logical bus topology.

2. B and D. Ethernet hubs act as Ethernet repeaters, which use Layer 1 logic. A hub immediately regenerates and repeats a new signal out all other ports, without waiting, and without using CSMA/CD. Both a hub and a bridge do not forward the data out the same port in which it was received. ...