| A | B |
|---|
| MOST COMMON SWITCHED PACKET FRAME NETWORK | FRAME RELAY |
| Is a substitute for dedicated lines when full-time circuit availability is not required | DIAL ON DEMAND ROUTING |
| Virtual Circuit | Logical Circuit |
| Is a virtual circuit that are dynamically established on demand and terminated when the transmission is complete. | Switched virtual circuit |
| Are used in situations where data transfer between devices is constant | Permanent Virtual Circuits |
| An ITU-T standard describing a synchronous, physical layer protocol used for communications between a network access device and a packet network. | V.35 |
| A common physical layer interface standard, developed by EIA and TIA, that supports unbalanced circuits at signal speeds of up to 64 kbps. | EIA/TIA-232 |
| The service provider | DCE |
| Attached Devices | DTE |
| It adapts the physical interface on a DTE device (such as a terminal) to the interface of a DCE device (such as a switch) in a switched-carrier network. | CSU/DSU |
| Is a device that is used to connect between a digital network and a voice-grade telephone line | MODEM |
| Manage networks by providing dynamic control over resources and supporting the tasks and goals for networks | Routers |
| multiport networking device | WAN Switch |
| This protocol can, among other things, check for link quality during connection establishment. | PPP |
| This number is a local identifier between the DTE and the DCE that identifies the logical circuit between the source and destination devices | DLCI |
| Is a WAN switching method in which a dedicated physical circuit is established, maintained, and terminated through a carrier network for each communication session. | Circuit Switching |
| is a WAN switching method in which network devices share a permanent virtual circuit (PVC) to transport packets from a source to a destination across a carrier network | Packet Switching |
| Designates a device that is compatible with the ISDN network | Terminal Equipment 1 (TE1) |
| Designates a device that is not compatible with ISDN and requires a TA. | Terminal Equipment 2 (TE2) |
| Converts standard electrical signals into the form used by ISDN so that non-ISDN devices can connect to the ISDN network | TA |
| Connects four-wire ISDN subscriber wiring to the conventional two-wire local loop facility. | NT Type 1 (NT1) |
| Directs traffic to and from different subscriber devices and the NT1. | NT Type 2 (NT2) |
| defines the interface between a TE1 and an NT. | The S/T interface |
| defines the interface between a TE2 and the TA. | The R interface |
| defines the two-wire interface between the NT and the ISDN cloud. | The U interface |
| operates mostly over the copper twisted-pair telephone wiring in place today. Delivers a total bandwidth of a 144 kbps line into three separate channels. | ISDN BRI |
| is used to interconnect LANs that are separated by a large geographic distance. | A WAN |
| provides a data path between routers and the LANs that each router supports | A WAN |
| PPP and HDLC | encapsulation formats |
