TestOut Networking Pro Ch 4 Exam Questions and Answers

TestOut Networking Pro Ch 4 Exam Questions and Answers Topology -Answer-Ethernet uses the following networking topologies, depending upon the specification being implemented: • Physical bus, logical bus • Physical star, logical bus • Physical star, logical star Networking Device -Answer-Devices used on Ethernet networks include: • NICs • Hubs (obsolete) • Switches • Routers Transmission Media -Answer-Ethernet supports the following cable types: • Unshielded twisted pair (UTP) cables with RJ45 connectors. This is the most common transmission medium used for Ethernet. • Fiber optic cables, most commonly used in high-speed applications, such as servers or streaming media. • Coaxial cables for older Ethernet implementations (often called thinnet or thicknet networks). Media Access Method -Answer-Ethernet uses a contention-based media access method defined by the IEEE 802.3 standards called Carrier Sense, Multiple Access/Collision Detection (CSMA/CD). Devices use the following process to send data: • Because all devices have equal access (multiple access) to the transmission media, a device listens to the transmission medium to determine if it is free before sending data (carrier sense). • If it is not free, the device waits a random amount of time and listens again to the transmission medium. If it is free, the device transmits its message. • If two devices transmit at the same time, a collision occurs. The sending devices detect the collision (collision detection) and send a jam signal to notify all other hosts that a collision has occurred. • Both devices wait a random length of time before attempting to resend the original message (backoff). Devices with collision detection turned on operate in half-duplex mode; devices with collision detection turned off operate in full-duplex mode Half Duplex -Answer-• Collision detection is turned on. • The device can send or receive in only one direction at a time. • Devices connected to a hub must use half-duplex communication. Up to the rated bandwidth (10 Mbps for 10BaseT, 100 Mbps for 100BaseT, etc.) Full Duplex -Answer-• Collision detection is turned off. • The device can send and receive at the same time. • Requires full-duplex capable NICs. • Requires switches with dedicated switch ports (a single device per port). Double the rated bandwidth (20 Mbps for 10BaseT, 200 Mbps for 100BaseT, etc.) Physical Addresses -Answer-Ethernet devices are identified by using the MAC address, which is burned into the network interface card. Frames -Answer-is a unit of data that is ready to