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ccna 200 301.(1) b (2) b and c (3) a and d (4) a and c (5) b (6) b and d Ethernet WANDTE DTELayer 1: TDM Layer 2: Frame Relay314 Chapter 15 Identifying Other WAN TypesTechnically speaking, Ethernet began as a LAN technology, primarily because Ethernet's distance limitations prevented it from establishing the longer links required for WAN services. Some time later, fiber-based Ethernet Layer I standards continued to improve in terms of speed and distance. The result: WAN service providers can and do provide WAN services at the edge and core of the provider's network using customer access links over Ethernet links.One particular Ethernet-based private WAN service resembles the model as Frame Relay. The access link uses the Ethernet standard rather than leased lines, while the router uses the Ethernet data link protocol rather than Frame Relay. Routers can send Ethernet frames to each other over the entire WAN. However, Ethernet WAN services cannot define concepts like PVCs.Layer 2:Ethernet Figure 15.3 Ethernet WAN Services in Direct Comparison with Frame Relay The Ethernet WAN services shown in Figure 15-3 have multiple names. This book tends to use the same names mentioned in the relevant Cisco tutorials, namely Ethernet overMPLS (EoMPLS) and the generic term Ethernet WAN. other different kinds of Ethernet WAN services include Metropolitan Ethernet (MetroE) and VirtualPrivateLAN Service (VPLS). The final term Ethernet Emulation highlights the fact that a provider emulates (acts like) a large Ethernet network, but that provider can use any technology to create the service. This diagram shows one way to think about Ethernet WAN services, focusing on how they are similar to Frame Relay. Ethernet WAN services definitely support faster speeds, whereas Frame Relay typically does not exceed a T3 link at about 44 Mbit/s, but Ethernet WAN services support 100-Mbit/s or 1-Gbit/s Ethernet. The following list summarizes some of the major similarities and differences between Ethernet WAN services and Frame Relay. The access link uses any Ethernet physical layer standard but often also uses some fiber optic standards to take advantage of longer cable lengths. 1 Banana Point . The customer router (or LAN switch) uses some Ethernet interface rather than a serial interface.. The customer router (orLAN switch) uses the data link protocol. This diagram will not show the DLCI, but may show the MAC address on the WAN. This diagram may show the Ethernet switches in the provider cloud. They are private for the same reasons that leased lines and frame relay are private.