Ccent/ccna Icnd1 Chapter 6

Front 1

anti-x

Back 1

term by Cisco for variety of security tools to help prevent various attacks like anti-virus, anti-phisshing, anti-spam

Front 2

connection establishment

Back 2

process by which connection-oriented protocol establishes connection (TCP has 3 way transmission of TCP segments)

Front 3

DoS

Back 3

denial of service - attack that causes probelms by preventing legitimate users to access services

Front 4

error detection

Back 4

process of discovering if data-link levcel frame was changed during transmissiong - typically uses FCS (Frame Check Sequence) field in data-link trailer

Front 5

error recovery

Back 5

notices when transmitted was not received and resends

Front 6

firewall

Back 6

device that forwards packets between less secure and more secure parts of network by applying rules

Front 7

flow control

Back 7

regulating amount of data sent - TCP uses windowing

Front 8

forward acknowledgement

Back 8

process by which error recovery is does by listing the next data to be sent, not last data successfully received

Front 9

HTTP

Back 9

protocol used by web browsers and web servers to transfer files

Front 10

Intrusion Detection System

Back 10

examines complex traffic patterns against a list of both known atttack signatures and general charcteristics of how attacks may be carreid out - rates each threat and reports threat

Front 11

intrustion prevention system

Back 11

exmaing complex traffic patterns aginst known list of attack signatures and general characteristics of how attacks may be carried out, - rates each threat and rects to prevent more threats

Front 12

ordered data transfer

Back 12

networking function included in TCP - defines how sending host should number data transmitted - how data should be recieved, reordered - and what to do if it can't be ordered

Front 13

port

Back 13

in TCP or UDP a number used to uniquely identify the application process that sent or recieved data - in LAN switching, another name for switch interface

Front 14

positive acknowledgement and retransmission (PAR)

Back 14

error recovery - receive must send acknowledgement data was recieved or lost - and request resending if necessary

Front 15

sliding windows

Back 15

mechanism to grant future windows is typcially a number growing upwards after each acknowledgment

Front 16

URL

Back 16

universal resource location - how to refer to pice of ino retrievable via TCP/IP network - used to identify web pages

Front 17

virtual private network

Back 17

process of securing communication between two devices whose packets pass over some public and unsecured network - typically internet - it encrypts packets

Front 18

VoIP

Back 18

transport of voice traffic inside IP packets over an IP network

Front 19

web server

Back 19

software that stores web pages and send them to web clients