B. A star topology uses a hub as a central point of communication. A ring topology uses a multiple station access unit. A mesh topology does not have a central hub.

A. Ethernet uses the CSMA/CD carrier access method to communicate. Token Ring and FDDI use a token-passing method. Bus is a topology, not a technology.

D. The IEEE 802.11g wireless standard uses the 2.4GHz radio band to communicate at 54Mbps. The 802.11a standard uses the 5Ghz band to communicate at 54Mbps, but is not widely used. The 802.11b standard uses the 2.4GHz band to communicate at 11Mbps. 802.11x is the general name for the widely used family that uses DSSS on the 2.4GHz band.

C. The maximum distance the 100BASE-FX can transmit is 20 kilometers.

D. The registered jack that is used on most network devices is called RJ-45. An RJ-11 is used for normal telephone connections. Category 5 is a cable standard, not a registered jack. ST is a connector used for fiber-optic connections, and is not a registered jack connector.

C. IEEE 1394 is widely known as FireWire. 802.11x is the family of wireless standards that use 2.4GHz radio band and a DSSS method of transmission. Category 5e is a cable standard used for Gigabit Ethernet. 802.5 is the IEEE standard used for IBM Token Ring networks.

B. The maximum transmission speed for Category 5e cable is 1000Mbps (1Gbps).

D. A switch is the only device listed that can be used to segment a network and create VLANs. A bridge can be used to segment a network, but it cannot be used to create VLANs. A router can be used to segment a network, but also cannot be used to create VLANs. A hub can neither segment a network nor create VLANs.

A. Infrared wireless communication uses light and requires line of sight to operate properly. 802.11x uses the 2.4Ghz radio band. DSSS is a signaling method used by most 802.11x devices. 802.11g uses the 2.4GHz radio band.

D. 802.11 devices use the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) method of carrier access. This means that they send a small signal to check media before they send the main signal. Token passing is used by ring networks. A wireless access point (WAP) is a transceiver device that is used with 802.11.

B. Multiple-station access units (MSAUs) are special hubs that are used in the Token Ring technology.

B, C. The two principle speeds of Token Ring are 4Mbps and 16Mbps. You must set the network card for the appropriate speed when you install it on a Token Ring network.

C. In terms such as 100BASE-TX the "T" always represents that twisted-pair cable is being used.

D. Shielded twisted-pair (STP) cable uses twisted-pair wires (as the name implies) with an extra foil shield to guard against electromagnetic interference (EMI). Thinnet and thicknet are coaxial cable types. Unshielded twisted pair (UTP) does not use a foil shield.

D. A CSU/DSU is a device that converts local area network (LAN) technologies to wide area network (WAN) technologies, and vice versa. Routers are used in LAN and WAN environments, but are not converters. Switches and bridges are primarily used in a LAN environment and are not converters.