Author: examcert

Objectives Upon completion of this chapter, you will be able to answer the following questions: • How do network devices use routing tables to direct packets to a destination network? • What is the function of fields in the routing table of a router? Key Terms This chapter uses the following key terms. You can…

Another form of CSMA used by IEEE 802.11 WLANs is carrier sense multiple access/collision avoidance (CSMA/CA). CMSA/CA uses a method similar to CSMA/CD to detect if the media is clear. CMSA/CA uses additional techniques. In wireless environments it may not be possible for a device to detect a collision. CMSA/CA does not detect collisions but…

Contention-based Access In contention-based multiaccess networks, all nodes are operating in half-duplex, competing for the use of the medium. However, only one device can send at a time. Therefore, there is a process if more than one device transmits at the same time. Examples of contention-based access methods include the following: • Carrier sense multiple…

Legacy LAN Topologies Early Ethernet and legacy Token Ring LAN technologies included two other types of topologies: • Bus — All end systems are chained to each other and terminated in some form on each end. Infrastructure devices such as switches are not required to interconnect the end devices. Legacy Ethernet networks were often bus…

WAN Topologies (31.1.2) WANs are commonly interconnected using three common physical WAN topologies Point-to-Point A point-to-point link (Figure 31-3), in the simplest and most common WAN topology. It consists of a permanent link between two endpoints. Figure 31-3 Point-to-Point Topology Hub and Spoke Figure 31-4 shows a WAN version of the star topology in which…

Objectives Upon completion of this chapter, you will be able to answer the following questions: Key Terms This chapter uses the following key terms. You can find the definitions in the Glossary. bus topologyCarrier sense multiple access with collision avoidance (CSMA/CA)Carrier sense multiple access with collision detection (CSMA/CD)extended star topologyfull-duplexhalf-duplexLogical topologyPhysical topologyring topologystar topologyIntroduction (31.0)…

• Copper Cabling—Networks use copper media because it is inexpensive, easy to install, and has low resistance to electrical current. However, copper media is limited by distance and signal interference. The timing and voltage values of the electrical pulses are also susceptible to interference from two sources: EMI and crosstalk. Three types of copper cabling…

Fiber patch cords are required for interconnecting infrastructure devices. The use of color distinguishes between single-mode and multimode patch cords. A yellow jacket is for single-mode fiber cables and orange (or aqua) for multimode fiber cables. Figures 30-28 through 30-31 show four types of fiber patch cords. Figure 30-28 SC-SC Multimode Patch Cord Figure 30-29…