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43 Cards in this Set
- Front
- Back
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X.25
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One of the first implementations of packet switching.
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asynchronous transfer mode (ATM)
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A cell-based switching technology (as opposed to a packet-switching technology). The cells involved in ATM are a fixed length, normally 53 octets (or 53 8-bit bytes).
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virtual circuit
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Technology that may use one or more physical circuit that resembles a single dedicated circuit.
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basic rate ISDN
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Digital technology that supports two 64 Kbps data links and one 16 Kbps D channel for timing.
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Trailer
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Information found at the end of a packet that includes items such as the cyclic redundancy check (CRC), which checks the size of the packet for accuracy at the destination computer.
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Border Gateway Protocol (BGP)
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A core routing protocol that bases routing decisions on the network path and rules.
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T-carrier
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A cabling and interface system designed to carry data at high speeds.
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broadband cable
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Technology used for cable Internet and cable TV. It operates at a higher speed than DSL.
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T3
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A truck carrier circuit that runs at 44.736 Mbps.
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Committed information rate (CIR)
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A term that describes a certain amount of information over time that you have committed to have available.
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T1
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A truck carrier circuit that runs at 1.544 Mbps.
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CSU/DSU
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A high-speed digital data interchange device.
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synchronous
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A method that uses a clocking circuit that controls the timing of communications between the different routers.
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digital subscriber line (DSL)
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A family of technologies that provides data transmissions over local telephone networks.
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static routing
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The manual configuration of a router.
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dynamic routing
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Uses protocols that automatically update routing tables between routers.
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SONET
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Technology that transfers multiple digital bit streams over optical fibers.
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fiber distributed data interface (FDDI)
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A standard for transmitting data on optical fiber cables at a rate of around 100 Mbps. It uses the ring topology.
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Routing Information Protocol (RIP)
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A dynamic protocol that uses distance-vector routing algorithms to decipher which route to send data packets.
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Frame Relay
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A form of packet switching newer than X.25 and is designed for faster connections.
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primary rate ISDN
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Digital technology that runs 1.536 Mbps and runs on a T1 circuit. PRI has 23 equal 64 Kbps B channels for data, along with one 64 Kbps D channel for timing.
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header
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Information found at the beginning of the packet that includes items such as the packet flag, HDLC (high-level data link control), the from address, information with error detection, and so on.
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POTS/PSTN
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Stands for plain old telephone system/public switched telephone network. This is what we use now for "regular" phone lines and it has been around since the 1940s.
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Interior Gateway Routing Protocol (IGRP)
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A proprietary protocol used in large networks to overcome the limitations of RIP.
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permanent virtual circuit (PVC)
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A virtual circuit that is always connected to a cloud.
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leased lines
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Lines or circuits that you pay a monthly fee to use.
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packet switching exchange (PSE)
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Large mega switching computers that are located in the central offices just inside the cloud that handle huge numbers of packets and decide which circuit (out of tens of thousands) each packet will take.
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Open Shortest Path First (OSPF)
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A link-state protocol that monitors the network for routers that have a change in their link state, meaning they were turned off, turned on, or restarted. This is perhaps the most commonly used interior gateway protocol in large networks.
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packet switching
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Technology that breaks down data into smaller packets and sent independently to its destination. When they arrive at their destination, they are put in the correct order and reassembled.
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Overhead
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The packet's header and trailer information combined.
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Integrated Services Digital Network (ISDN)
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A digital technology developed to combat the limitations of PSTN. Users that have ISDN can send data, fax, or talk on the phone, all simultaneously from one line.
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ATM
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A customer wants a WAN technology that does not use variable length packets but instead uses fixed length cells. You should recommend _______.
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RRAS
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You have been hired to install several routing protocols to a group of routers. Which one of the following is not an example of a dynamic routing protocol?
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BRI
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A client with eight computers needs a cost-effective Internet solution that can transmit 128 Kbps. You should recommend .
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Committed Information Rate (CIR)
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With Frame Relay, you must commit to a certain amount of information over time. This is known as the _____________.
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44.736 Mbps
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Data transfer rate of a T3 connection.
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FDDI
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A standard for transmitting data on optical fiber cables at a rate of around 100 Mbps.
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Synchronous
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X.25 connections utilize a clocking circuit. This makes them ___________.
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Packet Switching
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X.25 and Frame Relay are examples of what type of WAN technology?
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PAD
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What does X.25 use as its DTE device?
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Demarc
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What part of the network is the point where the responsibility of the administrator ends and the telecommunications provider's responsibility begins?
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Slow Speeds
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What is the primary disadvantage of X.25
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Ring
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What topology does FDDI use?
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