DBMS Flashcards
How many layers of OSI
7
year?
1984
name the layers
Application
Presentation
Session
Transport
Network
Data Link
Physical
application layer is used by?
network applications
browser that use internet such as chrome
protocols of application layer?
HTTP - web surfing
FTP - file transfer
SMTP - email sending
Telnet - virtual terminals
full from of HTTP
hyper text transfer
FTP?
File Transfer Protocol
SMTP?
Simple mail transfer protocol
use of presentation layer
receives data from app layer in from of numbers and char and presentation layer converts this data to machine understandatble binary format
three basic func of presentation layer
translation
data compression
encryption/decryption
which layer acts a traanslator for app and network layer?
presentation layer
presentation layer converts ASCII to?
EBCDIC
presentation layer uses what protocols for encryption
SSL/TLS
real life examples of presentation layer?
streaming services
web browsing
what is session layer?
manages communication between two devices
setting up and managing connections enabling sending and receiving of data, followed by termination of sessions or connections
what are main fuctions of session layer?
authentication
authorization
session manmagement
use of transport layer?
controls the reliability of communication
three func of transport layer
segmentation
flow control
error control
what does segmentation do
?
it divides the data received from session layer into smaller segments
what does each segment contain
sequence number and port number
use of port number?
help direct each segemtn to correct application such a chrome , firefox
use of sequence number?
helps re-arrange segments in correct order
what is flow control
the transport layer controls the amount of data being transmitted
error control in transport layer
if some data is missing at the receivers end this layer uses automatic repeat request to re transmit the lost or corrupted data
what are protocols of transport layer
TCP
UDP
Which is faster TCP UDP
UDP
TCP
connection oriented
UDP
connection less oriented
which provides feedback when data received? TCP UDP
TCP
when s TCP used
where full data is must like WWW
when is UDP used?
video games
movies streaming
transport layer send data segments to
network layer
what does network layer do with received segemnts from transport layer
transmits these segments from one PC to another located in different networks
what are data units in network layer called?
packets
what are functions of network layer
logical addressing path determination
routing
network layer assigns
IP add to receiver and sender for each segment
why are IP add assignmend
so that each data packet can reach correct dest
