NETWORKING
OSI network layers
1-4
At what OSI layer would you find HTTP messages?
Application layer
OSI Layer 7
Application layer. provides access for users, provides network service to the application, identify common partners, provides user athenication
Topology star
Central device connects devices together and is the most commonly used
Domain name system(DNS)
Coverts domain names to IP addresses
At what OSI layer would you find Frames?
Data link layer
OSI Layer 2
Data link layer,Access to the media, defines how data is formatted for transmission and how access through a network is controlled and provides error detection,ethernet
FTP
File transfer protocol, a communications method for transferring data between computers on the internet
Whats Scale-ability?
How easy the network can grow accommodate more users
Batch application
Little or no human interaction and can use low amount of connection and uses FTP, TFTP, file copies, software copies, inventory updates
Flow control
Makes sure data sent is not too much for the receiving machines.
Network diagram
Map of a network and shows logical representation
What do switches/routers do?
Move info to one interphase to another with decision making
OSI Layer 3
Network layer. routs data packets, selects best way to deliver data
Whats logical Topology?
Path data takes in transfer in a network and shows how network devices appear to network users
Bandwidth
The amount of data that can be transferred over a network in a certain amount of time
At what OSI layer would you find Application message fragmentation?
Transport layer
OSI Layer 4
Trasport layer.split the message into smaller bits for lower layers, deals with connection issues, flow controll and uses TCP and UDP
firewall
a computer firewall limits the data that can pass through it and protects a networked server or client machine from damage by unauthorized users
Standard OSI model
Layered approach, multivendor software
Real time application
Need good connection, used With video and voice and need low latency and it's real time so not losing data is important
OSI
Open Systems Interconnection
Whats Topology?
Physical arrangement of wires, network devices, endpoints
Whats Network media?
The way signal is transmitted ex: Cable,Wireless
How do applications and network work together?
Type of application you use can effect the network and the network can effect the application
UDP
User Datagram Protocol. if packets are missing it wont resend, light weight
server
a computer with large processing resources that stores all of the software that controls the network,as well as the software that can be shared with the computers attached to the computers attached to the work
modem
a device that allows computers to communicate over telephone lines
hub
a device that uses its ports to connect devices computers ,printers,etc together
Bluetooth
allows electronic devices like cellphones and computer to exchange data over short distances using radio waves
Bus Topology
cabled in a line
Routers do what?
gives of wireless connectivity and finds the best path to another network
What is the length of an IPv4 address?
32 bits
OSI developer layers
5-7
Topology mesh
All devices are connected to each other
Interactive application
Application that use use constant human interphase and need modest connection and response time is important/latency
At what OSI layer would you find Routes?
Internet layer
Whats IP address?
Internet protocol address ex: 192.168.1.324
At what OSI layer would you find Wireless transmission?
Physical layer
OSI Layer 1
Physical layer,binary transmission, defines electrical,mechanical,procedural and function specification for activating,maintaining and deactivating links
OSI Layer 6
Presentation layer.looks at data and ensures that the data is readable by the receiving system and secures and encrypt data.
OSI Layer 5
Session layer. establishes maintenance and termination of the session between applications and makes sure two different machines can establish a session also deals with security, name recognition and logging
Network protocol
Set of rules to communicate networks
Older OSI model
Slow development, no interoperability, controlled by one vender, propr
TCP
Transmission Control Protocol. if packets are missing it will be resent
TFTP
Trivial File transfer protocol
Switches do what?
can be built in or a separate device that connects through wires and finds the best path to another interpahse
Topology Ring
connected together from one device to another
ways to find the best data path
cue cost,hop count,bandwidth, longest match of network addresses
speed measured by?
data rate of a given link by bits per second
reliability
dependability of a component before failure
LAN
local area network;a geographic network that covers a relatively small geographic area such as a building or a small campus- no more than a mile distance between computers
Whats Availability?
measures the probability of uptime with (time a year/time of uptime)