Bsc it second year computer network

1. Topic : Quality Of Service &
Ineternetworking

2. CONTEXT
•Definition
•Parameters
•Flow characteristics
•Technique to improve
•Resource Reservation
•Application

3. Quality of service
The ability of the network to provide
better or special service to
set of dataflow to the detriment of
other dataflow”

4. •Flow data transfer
•Transit time when transferring data
•Residual error rate
•Probability of failure of the network
connection
•Release time the network connection

6. Reliability: Is a characteristic that a
flowneeds in order to deliver the
packetssafe and sound
Delay: Different application can tolerate
delay in different degrees
Jitter: jitter is the variation in packet
belonging to same flow
Bandwidth: different application need
different B/W

7. Techniques to improve the quality of service
Scheduling
FIFO (First-in-First-Out) QUEUING
PRIORITY QUEUING
WEIGHTED FAIR QUEUING
Traffic Shaping
LEAKY BUCKET
TOKEN BUCKET
Resource reservation
Admission control

8. Scheduling
Packet from different flow arrive at switch or router for processing
A good scheduling technique treats the different flow in a fair and
Appropriate manner

9. FIFO (First-in-First-Out) QUEUING
Full? processor Departure
Discard
Arrival
N
Y
Queue
Packet wait a buffer (queue) until the node is ready to process them.
If avg. arrival rate>avg. processing rate => new packet will be discarded.

15. Resource reservation
oA flow of data needs resources such
as buffer , bandwidth CPU time and so on
oQoS can be improved if these resources
are reserved beforehand

17. Application
•Mobile communication
•Real-time video and sound
•Transmission
•Interactive applications on network
•Routing for traffic with performance guarantees
•QoS-aware ATM application

18. Topic to be covered:
INTRODUCTION
REQIREMENTS OF INTERNETWORKING
DEVICES USED FOR INTERNETWORKING
COMPONENTS OF INTERNETWORKING

19. oInternetworking is the process or technique of
connecting different network by using intermediary
devices such as router or gateway device
oThe standard reference model for internetworking
is open systems interconnection (OSI)
o Any interconnection among or between public
private commercial industrial Or government
computer networks may also be defined as an
internetwork or internetworking