Wide area networks connect smaller networks over large geographical areas. Packet switching is the dominant switching method used, breaking data into packets that are routed independently to their destination. There are two main types of packet switching: connection-oriented uses virtual circuits to establish dedicated paths for packets to follow, while connectionless treats each packet independently without pre-establishing paths. Packet switching provides more efficient use of network bandwidth compared to circuit switching.
Switching concepts Data communication and networksNt Arvind
This slide explains you about the different types of sxitching networks like circuit switched network , datagram network , virtual circuit network , message switched network
switching techniques in data communication and networkingHarshita Yadav
it is a detailed presentation on switching techniques. it includes the three types of switching technique. it is described in such manner that you can learn switching without any difficulties.
This presentation is about the introduction to network switch layer technology. A network switch is a device tha is used to connect different segments over the network.This ppt includes introduction to switch,types of switches or layer specification,advantages and disadvantages of switch..
I hope it will be very helpful for the engineering students and the others who are interested to search in deep about network switch.
Different types of switching which are in computer network. here I will give brief knowledge of packet switching. also the packet switching different type like data gram packet switching(connection less approach) and virtual circuit packet switching explained.
These slides cover a topic on Multiplexing in Data Communication. All the slides are explained in a very simple manner. It is useful for engineering students & also for the candidates who want to master data communication & computer networking.
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and ending work in process of Br. 263,200. The direct labor cost incurred in the year is Br. 875,000 and the different manufacturing overhead costs incurred during the year are given below:
Indirect labor
Br. 98, 600
Depreciation on factory equipment
44,600
Light and power
43,600
Depreciation of factory building
12,000
Insurance expense on factory properties
9,500
Property tax
19,500
Factory supplies
9,900
Total Manufacturing overhead cost
Br. 237, 700
Compute the cost of goods manufactured.
Assume also that the finished goods inventory at the beginning of the year was Br. 314,000 and the ending inventory of finished goods is Br. 364,000 for Saron Furniture Factory.
Compute the cost of goods sold
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and ending work in process of Br. 263,200. The direct labor cost incurred in the year is Br. 875,000 and the different manufacturing overhead costs incurred during the year are given below:
Indirect labor
Br. 98, 600
Depreciation on factory equipment
44,600
Light and power
43,600
Depreciation of factory building
12,000
Insurance expense on factory properties
9,500
Property tax
19,500
Factory supplies
9,900
Total Manufacturing overhead cost
Br. 237, 700
Compute the cost of goods manufactured.
Assume also that the finished goods inventory at the beginning of the year was Br. 314,000 and the ending inventory of finished goods is Br. 364,000 for Saron Furniture Factory.
Compute the cost of goods sold
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and e
Switching concepts Data communication and networksNt Arvind
This slide explains you about the different types of sxitching networks like circuit switched network , datagram network , virtual circuit network , message switched network
switching techniques in data communication and networkingHarshita Yadav
it is a detailed presentation on switching techniques. it includes the three types of switching technique. it is described in such manner that you can learn switching without any difficulties.
This presentation is about the introduction to network switch layer technology. A network switch is a device tha is used to connect different segments over the network.This ppt includes introduction to switch,types of switches or layer specification,advantages and disadvantages of switch..
I hope it will be very helpful for the engineering students and the others who are interested to search in deep about network switch.
Different types of switching which are in computer network. here I will give brief knowledge of packet switching. also the packet switching different type like data gram packet switching(connection less approach) and virtual circuit packet switching explained.
These slides cover a topic on Multiplexing in Data Communication. All the slides are explained in a very simple manner. It is useful for engineering students & also for the candidates who want to master data communication & computer networking.
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and ending work in process of Br. 263,200. The direct labor cost incurred in the year is Br. 875,000 and the different manufacturing overhead costs incurred during the year are given below:
Indirect labor
Br. 98, 600
Depreciation on factory equipment
44,600
Light and power
43,600
Depreciation of factory building
12,000
Insurance expense on factory properties
9,500
Property tax
19,500
Factory supplies
9,900
Total Manufacturing overhead cost
Br. 237, 700
Compute the cost of goods manufactured.
Assume also that the finished goods inventory at the beginning of the year was Br. 314,000 and the ending inventory of finished goods is Br. 364,000 for Saron Furniture Factory.
Compute the cost of goods sold
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and ending work in process of Br. 263,200. The direct labor cost incurred in the year is Br. 875,000 and the different manufacturing overhead costs incurred during the year are given below:
Indirect labor
Br. 98, 600
Depreciation on factory equipment
44,600
Light and power
43,600
Depreciation of factory building
12,000
Insurance expense on factory properties
9,500
Property tax
19,500
Factory supplies
9,900
Total Manufacturing overhead cost
Br. 237, 700
Compute the cost of goods manufactured.
Assume also that the finished goods inventory at the beginning of the year was Br. 314,000 and the ending inventory of finished goods is Br. 364,000 for Saron Furniture Factory.
Compute the cost of goods sold
Illustration 2
Assume that the direct material inventory of Saron Furniture Factory amounts to Br. 248,000 at the beginning of the year i.e., as of July 1, 2014. Purchases of direct materials amounting Br. 440,000 was made and freight cost of Br. 3,200 is incurred during the year, and the amount of direct materials inventory at the end of the year is Br. 234,900.
Compute the direct materials used
Assume further that Saron Furniture Factory has beginning work in process of Br. 220,000 and e
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Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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2024.06.01 Introducing a competency framework for languag learning materials ...
Computer networks-WAN
1. COMPUTER NETWORKS
(Index)
Wide Area Network (WAN)
SWITCHING
Switched communication network
Packet Switching
Modes of Packet Switching
Types of Packet Switching
Packet switching Principles
Packet switching Advantages
Packet switching Disadvantages
Circuit Switching
Circuit switching Advantages
Circuit switching Disadvantages
2. Wide Area Network (WAN)
➢ A wide area network (WAN) is a network that exists
over a large-scale geographical area.
➢ A WAN connects different smaller networks, including
local area networks (LANs) and metro area networks
(MANs).
This ensures that computers and users in one
location can communicate with computers and users
in other locations.
➢ WAN implementation can be done either with the
help of the public transmission system or a private
network.
SWITCHING
➢ Switching is a method in which communication
devices are connected to one another efficiently.
➢ A switch is intermediary hardware or software that
links devices together temporarily.
➢ There are three fundamental switching methods:
circuit switching, packet switching, and message
switching.
3. Switched communication network:
➢ A circuit-switched communication system involves
three phases:
o Circuit establishment (setting up dedicated
links between the source and destination).
o Data transfer (transmitting the data
between the source and destination).
o Circuit disconnects (removing the dedicated
links).
➢ Consists of an interconnected collection of nodes
➢ Data are transmitted from source to destination by
being routed through the nodes
➢ The switching method describes how data are
processed and routed in the network.
4. Packet Switching :
➢ Packet switching is a digital network transmission process
in which data is broken into suitably-sized pieces or blocks
for fast and efficient transfer via different network
devices.
➢ When a computer attempts to send a file to another
computer, the file is broken into packets so that it can be
sent across the network in the most efficient way.
➢ These packets are then routed by network devices to the
destination.
➢ A small header containing signaling/addressing
information about the source and destination nodes is
added to each such small data unit, to form packets.
➢ Each packet is then routed from the source to the
destination by intermediate data exchange devices, using
the signaling information present in each packet.
➢ Packet switching is the switching method used in data
networks for computer communication.
5. ➢ In packet switching,
o There is no end to end circuit reservation
o A packet consists of a header and data
o Each packet has signaling information in the form of
source and destination addresses in the packet header.
o Signaling information is used by intermediate data
exchange devices to route packets.
o Exchange devices like routers and switches use a store and
forward approach for transmitting packets from an input
port to an output port
o Link utilization is efficient because there is no end to end
reservation of telecommunication links and multiple
connections can simultaneously share the link.
o Virtual Circuit and Datagram are two types of packet
switching, both of which are used in Computer
Communication at different layers. While VC based packet
switching is used primarily at the data link layer, datagram
based packet switching is used both at the data link and
network layers.
Modes of Packet switching:
There are two major modes of packet switching:
1. Connectionless Packet Switching: Each packet contains
complete addressing or routing information and is routed
individually. This can result in out-of-order delivery and
6. different paths of transmission, depending on the variable
loads on different network nodes (adapters, switches and
routers) at any given time. Also known as datagram
switching.
In connectionless packet switching, each packet has the
following information written in its header section:
-The destination address
-The source address
-Total number of pieces
-The sequence number (Seq#) needed to enable
reassembly after reaching the destination through
different routes, the packets are rearranged to form the
original message.
2.Connection-Oriented Packet Switching: Data packets are
sent sequentially over a predefined route. Packets are
assembled, given a sequence number and then
transported over the network to a destination in order. In
this mode, address information is not required. Also
known as virtual circuit switching.
Types of packet switching:
There are 2 types of packet switching:
➢ VC based packet switching/Connection oriented
packet switching
7. ➢ datagram based packet switching/connectionless
packet switching
VC based packet switching/Connection oriented
packet switching:
➢ A virtual circuit is a circuit or path between points in a
network that appears to be a discrete, physical path
but is actually a managed pool of circuit resources
from which specific circuits are allocated as needed to
meet traffic requirements.
➢ VC based switching is also called as connection-
oriented packet switching because a logical (not
physical) connection is first established between
sender and receiver, before data transfer starts.
➢ In VC based switching:
o Whenever a new session/flow of data transfer needs to
happen between a source and a destination node, a
connection establishment phase is executed in the
switched WAN network, using a signaling protocol.
o The signaling protocol (e.g. Label Distriution Protocol (LDP)
in MPLS) is first used to identify an end to end path
between the source and destination nodes. Once such a
path is identified, all packets of the data session/flow
MUST follow the same path. But this path is not reserved
for this session alone and multiple sessions can share the
links in this path.
8. o After identifying the path, packet switches/routers
allocate a set of VC IDs or labels to uniquely identify this
connection. These labels do not have end-to-end
significance and only have local significance at each
intermediate device.
o Data is split into small units and appended with a packet
header (containing labels) to form packets.
o Packets are switched within the WAN network through
labels. Usually the length of the label is shorter than IP and
layer 2 addresses thereby enabling faster lookup.
o At each intermediate device/packet switch, the device
looks at the incoming label and link. Based on this, it
identifies a suitable outgoing link and an outgoing label, by
consulting a local VC table. The label inside the packet
header is modified accordingly and the packet is switched
out of the outgoing link.
o At the end of the data transfer phase, the labels are
released from the VC table.
o VC based switching is very useful in Switched WAN Core
Backbone Networks for fast switching and better traffic
Engineering
Types of VC:
➢ Permanent Virtual Circuit (PVC)
➢ Switched Virtual Circuit (SVC)
9. Permanent Virtual Circuit (PVC):
➢ A permanent virtual circuit (PVC) is a virtual circuit that is
permanently available to the user just as though it were a
dedicated or leased line continuously reserved for that
user.
➢ A permanent virtual circuit (PVC) is a software-defined
logical connection in a network such as a frame
relay network.
➢ In frame relay, the end points and a stated bandwidth
called a Committed Information Rate (CIR) constitute PVC,
which is defined to the frame relay network devices. The
bandwidth may not exceed the possible physical
bandwidth. Typically, multiple PVCs share the same
physical paths at the same time. To manage the variation
in bandwidth requirements expressed in the CIRs, the
frame relay devices use a technique called statistical
multiplexing.
Switched Virtual Circuit (SVC):
➢ A switched virtual circuit (SVC) is a temporary virtual
circuit that is established and maintained only for the
duration of a data transfer session.
Datagram based packet switching/connectionless packet
switching:
10. ➢ Datagram based packet switching is the fundamental
method/technique used in the Internet for end-to-end
routing of packets at the Network Layer, between remote
communicating computers
➢ In datagram based switching, data is split into smaller units
and a header containing source and destination addresses
is added to each small unit to form packets. The packets of
a flow are given to the network and the network treats
each packet independently and routes the packet using
the packet header alone.
➢ It is also called connectionless packet switching
➢ It has no connection establishment and termination
phases.
➢ Each packet has header information and data
➢ Each packet of a data session/flow is independently
handled by the network, with no correlation between
other packets in the flow
➢ Packets of each session may take different routes
➢ Packets may also arrive out of order at the receiver
➢ Very simple to implement and scales well, as there are no
signaling protocols and VC tables required at intermediate
nodes
➢ IP and Ethernet are example protocols using the principle
of Datagram based Packet Switching
11. Datagram packet switching vs.
VC packet switching
Issue Datagram packet
switching
VC packet switching
Circuit setup No needed Required
Addressing Each packet contain full source
and destination address
Each packet contains a short VC
number
State
information
Subnet does not hold state
information
Each VC requires subnet table space
Routing Each packet is routed
independently
Route chosen when a VC is set up all
packets follow this route
Effect of router
failures
None: expect for packets lost
during the crash
All VCs that passed through the failed
router are terminated
Congestion
control
Difficult Easy if enough buffers can be allocated
in advance for each VC
Packet Switching Principles:
➢ Circuit switching designed for voice.
➢ Key characteristic is that resources within the network
are dedicated to a particular call..
➢ Much of the time a data connection is idle.
➢ Inefficient.
➢ Data rate is fixed.
Both ends must operate at the same rate, this limiting the
utility of the network in interconnecting a variety of computers.
Packet Switching Advantages:
i. Statistical Multiplexing.
ii. Every end point can operate on its own rate.
12. iii. Flexible to support various types of service.
iv. More adoptable to network condition changes.
Packet Switching Disadvantages:
i. Larger overhead.
ii. Data may not arrive in sequence.
iii. Unpredictable quality of service.
Circuit switching:
➢ Circuit-switched is a type of network in which a
physical path is obtained for and dedicated to a single
connection between two end-points in the network
for the duration of the connection.
➢ Ordinary voice phone service is circuit-switched. The
telephone company reserves a specific physical path
to the number you are calling for the duration of your
call. During that time, no one else can use the physical
lines involved.
➢ An End to end circuit (path) is first reserved using a
separate signaling protocol
➢ Data transfer proceeds only after the circuit establishment
phase
➢ All data of that session passes through the same circuit
➢ No other user can use this circuit till this session is
completed
➢ No signaling information is sent along with the data
13. ➢ Circuit is released after data transfer using the signaling
protocol
Circuit Switching Advantages:
i. Little Overhead.
ii. Data arriving in sequence.
iii. Predictable quality of service.
Circuit Switching Disadvantages:
i. Capacity during idle time is wasted.
ii. Source and destination must operate on same rate.
iii. Cannot support dynamic bandwidth request change.
COMPARISON
Circuit switching Datagram packet
switching
VC packet
switching
Dedicated transmission
path
No Dedicated
transmission path
No Dedicated
transmission path
Continuous transmission Transmission of packets Transmission of packets
14. Path stays fixed for entire
connection
Route of each packet is
independent
Path stays fixed for entire
connection
Call setup delay No setup delay Call setup delay
Negligible transmission
delay
Transmission delay for
each packet
Transmission delay for
each packet
No queuing delay Queuing delays at
switches
Queuing delays at
switches
Busy signal overloaded
network
Delays increase in
overloaded network
Delays increase in
overloaded network
Fixed bandwidth for each
circuit
Bandwidth is shared by all
packets
Bandwidth is shared by all
packets
No overhead after call
setup
Overhead in each packet Overhead in each packet