Chapter 7 Networking Concepts Flashcards
Host
Any device that sends or receives data in a network
Switch
Connects multiple devices to a network
Wireless router
Connects multiple devices to the network
Access point
Provides wireless connectivity with less features than a router
Modem
Connects a home or office to the internet
Copper cabling
Uses electrical signals to transfer data between devices
Fiber optic cabling
Uses gods or plastic fiber to carry info such as light pulses
Wireless connection
Uses radio signals, infrared tech or satellite transmission
Latency
Amount of time it takes data to travel from one location to another
Simplex
Simple one way transmission
Half duplex
When data flows in one direction at a time
Full-duplex
When data flows in both directions at the same time
LAN
Small area network
WLAN
Wide are network
PANS
Personal area network
MAN
Metropolitan area network
Spans across a campus or a city
P2P network
Each device has equivalent capabilities
Hard to manage and secure
OSI reference model
Physical Data link Network Transport Session Presentation Application
TCP/ip model
Application
Transport
Internet
Network access
Terms for pdus at layers
Data-application layer Segment-transport layer PDU Packet-network layer pdu Frame-data link layer pdu Bits-physical layer pdu
Terms for CSMA/CD
Carrier- medium to transmit data
Sense-each devices listens to ensure it is clear to send
Multiple access- can be used by different devices at once
Collision detection-causes a doubling of voltage on the wire
Two types of authentication introduced in the original 802.11 standard
Open system authentication-any wireless device can connect
Shared key authentication-allows data to be authenticated and encrypted
3shared key authentication techniques for WLAN
WEP
WPA
WPA 2
WEP
Wired equivalent privacy- original specification where encryption keys never change
WPA
WiFi protected access
Uses WEP but secures data with much stronger temporal key integrity protocol(TKIP)
WPA 2
Uses the Advanced Encryption Standard(AES)
Current industry standard
Three basic types of modems
Analog phone line
Digital subscriber line
Cable modem
Hub
Recieves data on one port and sends it to all other ports on a network
Extends reach of network by regenerating electrical signal
Bridges
Divides lan into segments
Keeps record of each device in a segment
Switches
Replaced hubs and bridges
Microsegment a lan by sending data only to device it was sent
Uses a switching table which lists all Mac addresses in network
Routers
Connect networks using up address to send data to other networks
Hardware firewall
Protects data and equipment on a network from unauthorized access by determining what is permitted on the network and what isn’t
Coaxial cables
Uses either copper or aluminum
Carries data in form of electric signals
Twisted pair cables
Uses twisted copper cabling to prevent cross talk
Unshielded twisted pair does not protect against emi
Twisted pair wiring schemes
T568a and t568b
Order for t568a
Green twist Green Orange twist Blue Blue twist Orange Brown twist Brown
Order for t568b
Orange strip Orange Green strip Blue Blue stripe Green Brown stripe Brown
Types of fiber media
Single mode fiber-uses single core tech and sends one beam at a time
Multi mode fiber- consists of a larger core and uses led emitters to send light pulses
