cisco ccna cyber ops certification

cisco ccna cyber ops certification.WAN connections consist of numerous types of devices and components. Figure 24.1 gives some of the WAN terms used for these devices and components, while Table 24.1 gives the definitions of these terms. As stated in Chapters 2 and 10, data communications equipment (DCE) is used to terminate the connection between two sites, provide clocking and synchronization for the connection, and connect to data terminal equipment (DTE). o DCEs include channel service units/data service units (CSU/DSU).Class 1 network terminators (NT1) and devices such as cable and analog modems. DTEs are end-user devices, such as routers or PCs, that connect to the WAN through a DCE. in some cases, the physical interface of the DTE may have the functionality of a DCE built into it; for example, some Cisco routers have an NT1 or CSU/DSU built into the WAN interface, and some laptops have a built-in analog modem.Local LoopDemarcation Point Diagram 24.1 WAN TerminologyChapter 24 Introduction to the WAN 641Exam Essentials DCE devices include modems and CSUs/DSUs o The CSU/DSU terminates the digital/synchronous (leased line) circuit, while the modem terminates the analog/asynchronous (telephone) circuit o The CSU/DSU is responsible for providing the clock and synchronizing signals between the DTE (such as a router) and the DCE (the CSU/DSU itself). This is intended to support channelized services such as dedicated T1 as well as services such as Frame Relay. Routers are often considered as DTE devices.Table 24.1 WAN terms and their definitions ° Definition of termsCustomer front-end equipment (CPE) Equipment in the subscriber network, including DCEs (modems, NT1s, CSUs/DSUs) and DTEs (routers, access servers)Demarcation Point The point of demarcation between the carrier's responsibilities and the subscriber's responsibilities, which may be inside or outside of the local facility. Note that this is the logical boundary and not necessarily the physical boundaryLocal Loop Connection from the carrier switching equipment to the demarcation pointCentral Office (CO) switch Carrier's switch in the long distance telephone network