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Definition
| Spread spectrum refers to a method of spreading a signal over a range or spectrum frequencies. |
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Term
MTU
Maximum Transmission Unit |
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Definition
| A method of splitting recombing and sequencing data grams across multiple point to point Wan Links |
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Definition
| A unit of measure used by routing protocol algorithms to determine the pest pathway for traffic to use to reach a particular destination |
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Definition
| the 10 Mbps baseband ethernet specification using two pairs of twisted pair cabling(categories 3,4 or 5): One pair transmits data and the other recieves data. 10BASE-T, which is part of the IEEE 802.3 specification has a distance limit of approximently 100m (328 feet) per segment |
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Definition
| A name for IEEE fast ethernet standard that uses two-pair copper cabling, a speed of 100 Mbps and a maximum cable length of 100 meters |
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Definition
| A name for the IEEE Gigabit Ethernet standard that uses four pin copper cabling a speed of 1000 Mbps(1Gbps) and a maximum cable length of 100 |
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Definition
| The IEEE standardized protocol for Vlan trunking |
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Definition
| The IEEE standard for wireless LANs using the U-NII spectrum, OFDM encoding at speeds of up to 54Mbps |
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Definition
| The IEEE standard for wireless LANS using the ISM spectrum, DSSS encoding and speeds of up to 11Mbps |
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Definition
| The IEEE standard for wireless LANS using the ISM spectrum, OFDM or DSSS encoding and speeds of up to 54 Mbps |
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Definition
| The IEEE standard for Wireless LAN security including authentication and encryption |
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Term
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Definition
| Authentication, Authoriziation, and Accounting. Authentication confirms the identity of the user or device. Authorization determines what the user or device is allowed to do. Accounting records information about access attempts inluding inappropriate requests. |
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Definition
| A Lan network design term taht refers to a switch interface connected to end user devices |
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Term
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Definition
| In frame relay the physical serial link that connects a frame relay DTE device usually a router to a FRAME Relay switch. The access link uses the same physical layer standards as do point-to-point leased lines |
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Term
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Definition
| a wireless lan device that provides a means for wireless clients to send data to each other and to the rest of a wired network, with the AP connecting boh the wireless LAN and the wired ethernet LAN. |
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Term
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Definition
| In security the recording of access attempts, See AAA |
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Term
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Definition
| in Wireless lans a method or mode of operation in which clients send data directly to each other without the use of a wirelesss access point (AP) |
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Term
| Adjacent-Layer Interaction |
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Definition
| The general topic of how one computer, two adjcent layers in networking architectural model works together with the lower layer providing services to the higher layer. |
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Term
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Definition
| In cisco routers, a means for one router to choose between multple routers to reach the same subnet when those routes were learned by differenet routing protocols. The lower the administratice distance the better the source of the routing information. |
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Term
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Definition
| Asymmetric digital subscriber Line . One of many DSL technologies ADSL is designed to deliver more bandwidth downstream( from the central office to the customer site) than upstream. |
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Definition
| The term used by Cisco to refer to a variety of security tools that help prevent various attacks to a MAC address. Defined in RFC 826 |
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Definition
| Address resolution Protocol. An internet protocol used to map an IP ADDRESS to a MAC address. Defined in RFC 826. |
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Term
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Definition
| A feature of many internet access technologies including DSL cable and modems in which the downstream transmission rate is higher than the upstream transmission rate. |
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Term
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Definition
| The Lack of impsed time ordering on a bit stream. Practically, both sides agree to the same speed, but there is no check or adjustment of the rates if they are slightly different. However, because only 1 byte per transfer is sent, slight differences in clock speed are not an issue. |
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Term
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Definition
| Asynchronous transfer mode. The international standard for cell relay in which multiple service types (such as voice video and data) are conveyes in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. |
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Term
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Definition
| In security the verification of the identity of a person or process. SEE AAA |
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Term
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Definition
| In security The determination of the rights allowed for particular user or device. SEE AAA |
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Term
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Definition
| An internetwork in the administratice control of one organization company or governmental agency inside which that organization typically runs an INTERIOR GATEWAY PROTOCOL(IGP) |
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Term
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Definition
| A physical connector on a router that is designed to be used to allow a remote terminal, or PC with a terminal emulator to access a router using an analog modem. |
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Term
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Definition
| A serial Link between two routers created without Csu/Dsus by connecting a DTE cable to one router and a DCE cable to the other. Typically used in labs to build serial links without the expense of an actual leased line from the telco. |
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Term
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Definition
| A term that refers to a general type of routing protocol algorithm, the other two being distance vector and link state. The enhanced Interior Gateway Routing Protocol (EIGRP) is the only routing protocol that cisco classifies as using a balanced hybrid algorithm. |
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Term
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Definition
| a refernece to the speed of networking link. Its origins come from earlier communications technology in which the range or width of the frequency band dictated how fast communications could occur. |
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Term
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Definition
| In wireless LANs a WLAN wth a single access point |
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Term
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Definition
| A Boolean and between two numbers of the same length in which the first bit in each number is ANDED and then the second bit in each number and the the third and so on. |
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Term
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Definition
| A Math operation performed on a pair of one-digit binary numbers. The result is another one digit binary number. 1 and 1 yields a 1: all other combinations yield a 0. |
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Term
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Definition
| The low order 4 bits of the cnfiguration register in a CISCO router. The value in the boot field in part tells the router where to look for a Cisco IOS image to load. |
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Term
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Definition
Basic Rate Interface. AN isdn interface cpmposed of two 64 kbps bearer (B) channels and one 16 kbps data (D) channel for circuit switched communication of voice video and data.
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Term
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Definition
| See subnet Broadcast Address |
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Term
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Definition
| a Set of all devices that receive broadcast frames originating from any device within the set. Devices in the same VLAN are in the same broadcast domain. |
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Term
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Definition
| An ethernet frame sent to destination address FFFF.FFFF.FFFF, meaning that the frame should be delivered to all hosts on that LAN. |
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Term
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Definition
| When subnetting a Class A, B, or C network the one subnet in wach classful network for which all subnet bits have a value of binary 1. The subnet broadcast address in this subnet has the same numeric value as the classful networks network wide broadcast address. |
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Term
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Definition
| A common physical sgnal path compared of wires or other media across which signals can be sent form ne part of a computer to another. |
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Term
CDP
CISCO DISCOVERY PROTOCOL |
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Definition
| A media- and protocol-independent device- discovery protocol that runs on most CISCO manufactured equipment including routers access servers and switches. Using Cdp a device can advertise its existence to otehr devices and receive information about other devices on the same LAN or on the remote side of a WAN. |
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Term
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Definition
| A device on the other end of some communications cable that is advertising CDP updates. |
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Term
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Definition
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Term
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Definition
| a generic reference to network services typically WAN services in which the provider sets up a (LAYER 1) circuit between two devices and the provider makes no attempt to interpret the meaning of the bits (see also packet switching) |
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Term
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Definition
| AN IPv4 Class A,B or C network called a classful network because these networks are defined by the class rules for IPv4 addressing. |
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Term
| Classful Routing Protocol |
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Definition
| Does not transmit the mask information along with the subnet number and therefore must consider Class A B and C netowrk boundaries and perform autosummarization at those boundaries. Does not support VLSM |
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Term
CLI
Command Line Interface. |
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Definition
| An interface that enables that user to interact with the operating system by entering commands and optional argumetns. |
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Term
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Definition
| the speed at which a serial link encodes bits on the transmission medium |
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Term
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Definition
| the process of supplying a signal over a cable either on a seperate pin on a serial cable or as part of the signal transitions in the transmitted signal so that the recieving device can keep synchronization with the sending device. |
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Term
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Definition
| Coder-Decoder. an integerated circuit device that transforms analog voice signals into a digita bit stream and than transforms digital signals back into analog voice signals. |
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Term
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Definition
| A set of network interface cards (NICS) for which a frame sent by on NIC could result in a colision with a frame sent by any other NIC in the same collision domain. |
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Term
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Definition
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Term
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Definition
| A Part of the Cico IOS software CLI in which the user can type configuratuon commands that are then added to the devices currently used configuration file (running Confg) |
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Term
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Definition
| In Cisco routers a 16 bit user-configurable value that determines how the router functions during initialization. In software the bit postion is set by specifiying a hexadecimal value using configuration commands. |
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Term
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Definition
| The process by which a connection oriented protocol creates a connection. With Tcp a connections is established by a three way transmission of tcp segments. |
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Term
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Definition
| A physical socket on a router or witch to which a cable can be conneted between a computer and the router/siwtch for the purpose of allowing the comuter to use a terminal emulator and use the CLI to configure veryify and troubleshoot the router/switch. |
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Term
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Definition
| The time required for routing prtocols to react to tchanges in the network removing bad routes and adding new better routesso that the current best routes are in all routers routing tables. |
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Term
CPE
Customer Premises Equipment |
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Definition
| Any equipment related to communications that is located at the customer site as opposed to inside the telephone companys network. |
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