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)