Cisco 3 - Ch. 1 - Networking In The Enterprise

Front 1

Enterprise

Back 1

Corporation, business, or other entity that uses computers in a networked environment. An enterprise usually refers to large companies or organizations with complex networks.

Front 2

Intranet

Back 2

Networks accessible to internal users of an organization. An intranet is used to share internal information and computing resources.

Front 3

Extranet

Back 3

Network that provides access to information or operations of an organization to suppliers, vendors, partners, customers, or other businesses. Extranet is a private network using Internet protocols and the public telecommunication system to share internal resources. It may be considered an extension of an intranet.

Front 4

Telecommuter

Back 4

One who works from a location other than the centralized office.

Front 5

VPN

Back 5

"virtual private network"
Network through which data is sent through a public telecommunication infrastructure while maintaining the privacy of the data by creating a tunnel through the public telecommunication infrastructure.

Front 6

Enterprise Network

Back 6

Network that integrates all systems within a company or organization.
*Support for critical applications
*Support for converged network traffic
*Need for centralized control
*Support for diverse business requirements

Front 7

Converged Network

Back 7

A network capable of carrying voice, video and digital data.

Front 8

Mission-critical

Back 8

Type of network or computing process that is vital to an organization. Mission critical applications that are halted often or for too long may have negative consequences.

Front 9

Failover

Back 9

Occurrence of a redundant network device performing the load or function of another device automatically if the initial device fails. The failover scheme creates a backup system for mission-critical hardware and software. The objective is to reduce the impact of system failure to a minimum by actively monitoring and identifying system failure.

Front 10

Hierarchical Design Model

Back 10

Representation of a network featuring an access layer, a distribution layer, and a core layer.

Front 11

Hierarchical Design Model [graphic]

Back 11

Access Layer, Distribution Layer, and Core Layer.

Front 12

QoS

Back 12

"quality of service"
Standard for monitoring and maintaining a level of transmission performance and service, such as available data transmission bandwidth and error rate.

Front 13

Enterprise Campus

Back 13

Consists of the campus infrastructure with server farms and network management

Front 14

Enterprise Edge

Back 14

Consists of the Internet, VPN, and WAN modules connecting the enterprise with the service provider's network

Front 15

Service Provider Edge:

Back 15

Provides Internet, Public Switched Telephone Network (PSTN), and WAN services

Front 16

ECNM

Back 16

"Enterprise Composite Network Model"
Cisco network design that divides the network into functional components while still maintaining the concept of Core, Distribution and Access layers. The functional components are the Enterprise Campus, Enterprise Edge, and Service Provider Edge.

Front 17

failure domain

Back 17

Is the area of a network impacted when a key device or service experiences problems.

Front 18

back end

Back 18

Application that performs final or hidden functions in a process.

Front 19

LAN

Back 19

*Organization responsible for managing infrastructure
*Ethernet
*Access & Distribution layers
*Local applications & server farms
*Devices are in same building or campus

Front 20

WAN

Back 20

*Sites are geographically dispersed
*Connections through CSU/DSU
*ISP services like T1/T3, E1/E3, DSL, Cable, Frame Relay, ATM
*ISP responsible for maintenance
*Edge devices modify encapsulation from Ethernet to Serial

Front 21

CSU/DSU

Back 21

"channel service unit/data service unit"
Network devices that connect an organization to a digital circuit.

Front 22

HDLC

Back 22

"High-Level Data Link Control"
Bit-oriented synchronous Data Link layer protocol developed by ISO. HDLC specifies a data encapsulation method on synchronous serial links using frame characters and checksums.

Front 23

PPP

Back 23

"Point-to-Point Protocol"
Standard that provides router-to-router and host-to-network connections over synchronous and asynchronous circuits.

Front 24

Frame Relay

Back 24

Industry-standard, switched, WAN standard that operates at the Physical Layer and Data Link Layer of the OSI Reference Model. Frame Relay handles multiple virtual circuits using HDLC encapsulation between connected devices. It is more efficient than the X.25 protocol that it replaced.

Front 25

ATM

Back 25

"asynchronous transfer mode"
International standard for the cell relay of service types, such as voice, video, or data. In ATM, the services are conveyed in fixed-length, 53-byte cells. Fixed-length cells reduce transit delays because cell processing occurs in the hardware. ATM is designed for high-speed transmission media such as E3, SONET, and T3.

Front 26

UDP

Back 26

"User Datagram Protocol"
Standard for connectionless transmission of voice and video traffic. Transmissions using UDP are not affected by the delays caused from acknowledgments and retransmitting lost packets.

Front 27

Jitter

Back 27

Caused by network congestion, is the variation in time of the packets arriving at their destination.

Front 28

IPSec

Back 28

*Data encryption
*Integrity validation
*Peer authentication
*Key management