Topic 6.1 Flashcards
What is the Function of the Application layer?
It is where the User interface is and it is basically the human interaction with applications that uses the internet and have many application protocols to organize data
What is the Function of the Presentation Layer?
It Has 3 Basic Functions which is
1) Translation of data to make it presentable
2) Compression of Data to make efficient transfer
3)Encryption/Decryption for security purposes
in transmitting and receiving of data the presentation layer perform these 3 functions as and when is needed
What is the Function of Session Layer?
It is basically responsible for managing connections/session between devices. it is also responsible for authentication and authorization of accessing certain connections between devices or servers.
What is the Function of Transport Layer?
it has 3 Basic Functions
1) Segmentation
2) Flow Control
3) Error Control
What is Segmentation?
Segmentation is basically breaking down of Big data received from session layer into small segments and adding your source and destination port numbers and sequence numbers to the data.
Port Number: is to direct the data to which internet based application
Sequence Number: is to tell you which order to arrange the data in
What is Flow Control?
Flow Control Basically means it Syncs the Transfer and receiving speed of 2 communicating devices so that no loss of data and misinterpretation of data will happen.
(Eg. 100Mbps PC Transfer to 10Mbps Phone. Max receiver is 10Mbps so u transport layer will tell PC to transfer at 10Mbps so no errors)
What is Error Control?
It is Basically responsible for checking if there is any missing data and using signal protocols to ensure there is no missy data when passing the segments to the next layer
The Transport layer have 2 Services/Protocols What are they?
1) TCP (Transmission Control Protocol: Wired) Slower
2) UDP (User Datagram Protocol: Wireless) Faster
What is the Function of the Network Layer?
It has 3 Basic Functions
1) Logical Addressing/ IP Addressing
2) Routing
3) Path Determination
What is Logical Addressing / IP Addressing?
It is the process of adding the source and destination IP Address to encapsulate the segment to form data packets so that the data knows where to go and who its from
What is Routing?
Routing is Basically Done by the Router and it is basically like a Highway system where the Router has a routing table and the first 3 digits represent the name of the Highway exit. it matches the packet IP address with the routing table and directs it where to go
What is Path determination?
It is basically the process of finding the best and fastest and most efficient path the data can travel to reach it’s destination the fastest
What is The Function of Data Link Layer?
It is responsible for controlling when device should transmit data to prevent collision of data in the case of 2 PC sending data to the hub at the same time and Physical addressing where the MAC address is build into the NIC and also to check for errors with FCS
What is the Function of Physical Layer?
The Physical Layer is Basically Responsible for converting digital Binary data Bits into Analogue physical signals in the form of either electric voltage, optical signal or radio waves.
What is usually in the Frame?
1) FCS
2) S and D MAC address
3) S and D IP address
4) S and D Port Numbers
5) Sequence Number
6) Data
