CPT Simulacijski način rada eng v3
Summary
TLDRThis video provides an introduction to the Packet Tracer simulation environment, explaining the differences between real-time and simulation modes. It covers how to control and observe network traffic, manage time progression, and interact with tools like the simulation panel, packet filters, and complex PDUs. The video also explores advanced features such as creating multiple scenarios, editing PDUs, and viewing packet details. Additionally, it demonstrates how to use the challenge mode to test your understanding of the OSI model, making it a valuable resource for networking learners.
Takeaways
- 🕰️ In real-time mode, the time runs continuously, while in simulation mode, time can be stopped, slowed down, or controlled manually.
- 🔍 The simulation panel allows users to monitor network traffic, viewing one packet at a time.
- ⏯️ The forward, play, and back buttons control the movement of packets within the simulation panel step-by-step or automatically.
- 🔄 Power cycling restarts all devices, clearing the event list and requiring configurations to be saved beforehand.
- ⚡ The animation speed in simulation mode can be adjusted using a slider, affecting how fast packets are forwarded.
- ⏲️ The constant delay feature ensures consistent transmission and propagation times, which can be toggled off for variable delays.
- 📊 The edit filter option allows users to choose which protocols are visible in the simulation panel without removing them from the network.
- 🌐 Users can create ACL filters to control the visibility of specific packet types, such as permitting or excluding protocols.
- 💻 The complex PDU feature allows detailed control over packet creation, including source, destination, sequence numbers, and size.
- 🧑🏫 The OSI model tab in the PDU information window helps users understand how packets are processed at each network layer.
Q & A
What is the difference between real-time mode and simulation mode in Packet Tracer?
-In real-time mode, time runs continuously, and the network functions as it would in reality. In simulation mode, time is stopped and can be controlled by the user to observe network traffic in detail, packet by packet.
How do you control the speed of a simulation in Packet Tracer?
-The speed of a simulation can be controlled using the slider in the simulation mode. Dragging the slider to the right speeds up the simulation, while dragging it to the left slows it down.
What happens when the 'Power Cycle devices' option is selected?
-When the 'Power Cycle devices' option is selected, all devices in the network are restarted, and the event list is cleared. It's important to save any running configurations to avoid losing unsaved changes.
What is the purpose of the 'Edit Filter' in Packet Tracer?
-The 'Edit Filter' allows users to control which protocol events are visible in the simulation panel. Disabling a protocol in the filter does not stop it from propagating on the network, but it hides it from view.
What does the 'constant delay' option do in Packet Tracer?
-When 'constant delay' is enabled, the transmission and propagation delay between packets is kept consistent. Disabling it allows for varying delays between packets.
What is the 'user created packet window' used for?
-The 'user created packet window' allows users to view and manage scenarios where they have created specific packets for testing. It also enables the creation of multiple scenarios without losing previous ones.
What is the purpose of creating a complex PDU in Packet Tracer?
-A complex PDU allows for detailed customization of packet transmission, including defining the packet's size, time-to-live (TTL), sequence number, and the interval at which the packet is sent.
What does the 'Type of Service' field represent in the IP header?
-The 'Type of Service' field in the IP header represents the quality of service (QoS) for the packet, indicating how the packet should be handled in terms of priority across the network.
How does the 'challenge mode' in Packet Tracer help users?
-The 'challenge mode' tests the user's understanding of the OSI model by asking questions about each layer. It provides hints and immediate feedback on correct and incorrect answers.
What happens when you 'reset devices' in Packet Tracer?
-When devices are reset, the simulation starts from scratch, clearing the event list and reinitializing network services like HTTP. It's important to save configurations before resetting.
Outlines
🚀 Introduction to Packet Tracer Simulation Modes
The video begins with an introduction to the Packet Tracer environment, specifically focusing on the simulation and real-time modes. In real-time mode, the network runs continuously, indicated by a clock. Switching to simulation mode stops the time, allowing users to control and observe network traffic at a detailed level. The simulation panel provides features to control the speed of time, step through events, and play or pause the simulation. The episode also discusses how to add a Ping PDU and the importance of saving configurations before restarting devices.
📊 Controlling Packet Tracer Simulation Speed and Filtering Events
This section explains the control of animation speed in Packet Tracer's simulation mode, demonstrating how dragging the slider affects the speed of the simulation. It then covers resetting the simulation to observe speed changes and introduces constant delay, which can be enabled or disabled to control packet transmission delays. The user can also use filters in the simulation panel to control which network events are visible, with the ability to customize the view by selecting or excluding different protocols.
🔄 Creating and Managing Scenarios in Packet Tracer
Here, the video shows how to create and manage multiple scenarios within a Packet Tracer project. The user can create a test scenario without losing the previous one, allowing for multiple simulations on the same topology. The speaker demonstrates a ping between two devices and explains how packet events are displayed in the simulation. The discussion includes viewing Quality of Service (QoS) stamps, which indicate special handling of packets, and how these marks can be toggled on and off in preferences.
🔧 Creating Complex PDUs and Customizing Packets
This segment dives into creating complex PDUs in Packet Tracer. The user can define source and destination IP addresses, the TTL (Time to Live), the sequence number, and packet size. The video details how to configure periodic intervals for sending packets and how to modify or delete PDUs after creation. The speaker also shows how to change the color of PDUs for better visualization and explains the distinction between simulation time and the event list's time.
🧩 Understanding the PDU Information Window and OSI Model
The final part of the video covers the PDU information window, which provides details about packet processing at each OSI layer when clicking on packet events in the simulation. The video explains how incoming and outgoing layers are displayed, as well as the inbound and outbound PDU details, showing header fields and packet status. Additionally, the challenge mode is introduced, where users answer questions about the OSI model to test their knowledge. If the user answers correctly, they can proceed to the next layer.
Mindmap
Keywords
💡Simulation Mode
💡Real Time Mode
💡PDU (Protocol Data Unit)
💡Event List
💡ACL Filter
💡Constant Delay
💡Quality of Service (QoS)
💡Complex PDU
💡OSI Model
💡Challenge Mode
Highlights
Introduction to Packet Tracer's simulation environment, covering both real-time and simulation modes.
Explanation of real-time mode where time runs continuously, shown by a clock.
In simulation mode, time can be controlled manually, useful for detailed network traffic observation.
The simulation panel allows controlling time by playing, forwarding, or rewinding steps during simulation.
Power cycling devices clears the event list and restarts all devices, requiring configurations to be saved beforehand.
Ping commands are used to demonstrate packet creation between devices like PC0 and server.
In simulation mode, the time slider adjusts the speed of time flow and animation.
Constant delay option maintains uniform transmission and propagation delays between packets.
Edit filter feature allows users to hide or show network protocol packets in the simulation, without affecting their propagation.
Advanced ACL filter creation process, including a step-by-step guide for setting up filters for specific network traffic.
Creation of multiple simulation scenarios that can run simultaneously for different test environments.
The simulation panel displays packet events in real-time, including packet creation and progress.
Detailed explanation of the PDU (Protocol Data Unit) window, showing the OSI model, inbound, and outbound details for each packet.
Challenge mode tests knowledge of the OSI model, providing hints and feedback on correct or incorrect answers.
Explanation of complex PDU creation, allowing for customized packet configurations with options for TTL, sequence numbers, and packet size.
Transcripts
hello and welcome to this episode of
Packet Tracer in this episode we want to
have a brief introduction of simulation
environment so let's get started
so by default we are usually in real
time mode and in real time mode the time
is running continuously and it's
indicated by this clock
if we switch to the simulation mode the
time stops
and the simulation mode is used to
observe Network traffic and detail and
time can be directly controlled by us
the user
in the simulation mode we can stop or
slow down time to allow us to view data
traffic one packet at a time
let's add a simple pdu a ping pdu from
pc0 which is the source to server zero
which is the destination
now you can see that the packets has
started appearing here in the simulation
panel
in the simulation panel we can control
Time by going forward one step at a time
to continuously play time and to go
backward
these controls are also available in
here for us in the simulation toolbar
we also have the ability to hide the
simulation panel so if I click event
list the simulation panel will disappear
and if I click on it once again the
simulation panel will appear once again
the forward button will forward
simulation one step at a time the play
button will automatically show and run
events
and if we click on the back button the
back button can be used to view packets
that occurred on a previous time frame
if I click on play once again
the time will stop or pause
if I click on Power Cycle devices all of
the devices will be restarted and
the event list will be cleared
and all these startup processes such as
HTTP will initialize once again and you
need to save any configurations before
restarting the devices so if you haven't
copied your running config to the
startup config you need to do the so
otherwise you will lose your
configuration
we can click on no to cancel the power
cycle of devices
and that's it for this episode everyone
I hope this has been informative for you
and I would like to see you in the next
episode hello and welcome to this
episode of package racer in this episode
we want to discuss a few features of the
simulation panel so let's get started
first we want to create a packet from
pc0 to server zero
as you can see here in the simulation
panel we have these buttons the play
button will run the time in simulation
mode and packets will start forwarding
the forward button will forward the
packets one step at a time and the back
button will return to a previous time
frame
now let's play this simulation
this slider controls the speed of the
animation and the speed of the time in
the simulation mode and if we drag it to
the right side the time will flow faster
and if we drag it to the left side the
time will be slower
now let's reset the simulation so you
can see the effect of the slider if I
bring it to the left side the time will
be very slow and you can see that the
animation is very slow now I'm dragging
it to the right side now you will see
that the animation will be much faster
now if I click on the play button once
again the simulation time has stopped
and this is the time when the last
packet has happened in the simulation
this time is specific to the simulation
panel and it shows the time relative to
the last time that the simulation was
restarted and it is very different from
the time that's running in here
the last device shows the previous
location of the packet and the add
device shows the current location of the
packet as you can see the packet is
currently at pc0 and the type obviously
specifies the type of packet
we also have this constant delay if we
have this constant delay enabled the
transmission and propagation delay will
be constant but if we remove it the
transmission and propagation delay will
be different let me show you how
let's enable constant delay
and let's restart the devices so our
packets are created
now you can see that delay between each
of the packets are quite constant it's
almost one millisecond and if I remove
the constant delay and restart the
devices once again
now play the simulation mode
you can see that the time
frame between each packet is different
between these packets it's almost 2
milliseconds but now C in this packet
it's one millisecond and that's how the
constant delay make sure that the
transmission and propagation delay is
constant
the edit filter will allow us to control
which events will be visible in the
simulation panel let's go to the edit
filter
we have four tabs in the edit filter
window ipv4 IPv6 and miscellaneous
and various Protocols are categorized
under these tabs ipv4 IPv6 and
miscellaneous
if we add or remove some protocols from
the filter that doesn't mean that these
packets will disappear from the network
these packets will still be on the
network but they just won't be visible
so if I remove ospf
that means that the ospf packet will
still propagate in the network but it
will not be visible to me
let's go to the edit ACL filters
here we can create ACL filters and let
me create a new ACL filter and give it
a name
let's start by permit
space
IP
Annie
Annie
and as you can see I also have the
context help available
once the carriage return is shown to me
that means that my ACL filter is almost
at the end so I can submit it
and now this statement is added
now let's close this window
and close this window as well
you will be able to see that the in the
event list filters I have my all allow
filter
now let's go and delete that filter
now that filter is gone
we have the ability to show all the
filters or exclude all of the filters
with this button
now that I have all of the filters
enabled I can exclude one or two
or maybe when I don't have any of the
filters enabled then I can include one
or two
and that's it for this episode everyone
I hope this has been informative for you
and I would like to see you in the next
episode hello and welcome to this
episode of Packet Tracer in this episode
we want to discuss about some Advanced
features of simulation mode so let's get
started
here I want to click this arrow and I
want to open this area this area is
called the user created packet window I
have the ability to switch between
different scenarios
scenarios allow you to play with a
topology with different ways for example
I have a different
packet created on this topology on
scenario zero and then I don't want to
lose that and I want to create another
scenario I will call it my
test scenario
and then I can create other type of
packets on the test scenario and I will
be able to have both of these scenarios
available to me at the same time
now let's go to this window and add some
description for scenario one or my test
scenario let's call it test scenario
description
now let's close this window
now I want to Ping pc1 from pc0 let me
write the IP addresses for you so it
makes it easier for you to understand
this is 1.1 and this is 192.168.1.2
let me open PC zero
and issue a ping command
paying 192 168 1.2
now you could see that the Ping package
has appeared in here in the event list
even though they have not appeared in
the user created packet window
if I forward this simulation a little
bit and samping commands are created you
will be able to see that I can see in
real time the result of my ping commands
let's go a bit further more
as you can see my ping command was
successful
now let's close this window and see a
few other packets
now as you can see the quality of
service router has created a packet that
has a small square mark on top of the
packet this is called the quality of
service stamp and it means that the type
of service field is set in the IP header
for this packet
we can change the ability to view this
type of quality of service marks or to
disable this type of quality of service
Marks here in the preferences and if I
come to show quality of Service stamps
on packets if I play with this option
you can see that this Mark can appear
and disappear
I wanted to show all the time so I will
click on show and close preferences
now let's go and create a complex pdu I
can create a complex video by coming to
here and add and clicking on the add
complex pdu icon once I've clicked to
the add complex video icon my cursor
will change and I can click on the
source device
and this window will appear for me
now this is the source device and I can
choose the outgoing port or Packet
Tracer will also Auto Select that port
for me
for my PC I don't have any other Port so
the Auto Select is good
I have the ability to change between
different type of applications but for
me ping is good
I want to enter the destination IP
address as well
I can do that by entering the
destination IP address using my keyboard
or I can also
click here on the destination device and
the address will appear for me
The Source IP address I want to leave it
blank because the fast ethernet zeros IP
address will be used by default
I can also Define the TTL or time to
live value for this ping packet
and I can additionally Define the type
of service field for this IP packet
I need to add a sequence number because
this is mandatory and sequence numbers
are used for Ping packets or any other
packets that have been duplicated
dropped or re-ordered and the sequence
number is useful for such purposes
the size of packet I can Define the size
of packet as well well we forgot to have
the sequence number let's put let's put
one
the size of the packet I can Define the
size of the packet in bytes usually it's
32 bytes but I want to create it a
hundred byte
we can send this complex pdu at one shot
at a specific time we can specify the
time or we can specify a periodic
interval that the pdu will be sent
remember that this time
is related to the time in the event list
and it's not related to this time in
here
let's create an interval of 5 Seconds
and create a video
now as you can see the pdu has appeared
in the user created pdu window I can
toggle this pdu list window and a better
view is shown to me
if I double click on the fire field
this pdu will be created and will be
sent
the last status will show the status of
the pdu packet if it is in progress or
it has failed or it has succeeded The
Source obviously shows the source device
and the destination shows the
destination device
the type shows the type of protocol that
we are using and the color is an
indicator of the color here in the
workspace
I don't like this color so I can change
it
if I double click on the color then I
can change to another color let's select
black because I like black
and let's click ok
now you can see that
the color has changed and it has also
changed here in the simulation on the
animation and it has also changed in
here in the event list
the time here is the time interval and
the period shows whether this pdu is
created for for intervals yes or no
the number shows the sequence of this
pdu
and we can edit this pdu once again if I
double click on the edit
or I can delete this pdu all together by
double clicking the delete
now the pdu is completely deleted
now I want to toggle back this PDO list
window to its place
and delete our test scenario
and we go back to our scenario 0 which
is the default scenario
and that's it for this episode everyone
I hope this has been informative for you
and I would like to see you in the next
episode hello and welcome to this
episode of Packet Tracer in this episode
we want to talk about pdu information
window so let's get started
first I want to go to the simulation
mode and here I am in the simulation
mode and I have my simulation panel let
me create some ping packets from one
device to another so that some traffic
is generated and my event list is
populated as you can see my event list
is populated and I can see the packets
here in the animation and also the
packets here the in the event list and
if I click on any of them here in the
animation or if I click here on top of
the event list packet
this pdu information window will appear
for me
in the pdu information window we usually
have three tabs but now for this packet
we have two tabs which is the OSI model
and the outbound pdu detail
now let's move forward these simulation
so we can have a packet that will have
all the three tabs
now in here we have this packet which
has the OSI model the inbound pdu
details and the outbound pdu details
here in the OSI model tab the pdu
information window is showing the
information on how this packet is being
processed at each layer of Packet Tracer
by the device
you can see that we have some
information such as ADD device which
means that this packet is located here
in R3 the source of the device was this
router and the destination of the device
was the artery itself
we have the incoming layers and the
outgoing layers the incoming layers they
show us how this packet is being
processed when it's received at this
device and the outgoing layers it shows
us the decisions that this device has
taken to forward this message this
packet out of its Sports
for incoming layers we need to start
from bottom to and go to the top and for
the outgoing layers we can start from
the top and go to the bottom
if I click on each layer then additional
information about that layer will appear
for me in here
or I can click on this previous layer or
next layer buttons
in the inbound pdu information there is
some information about the pdu type and
the IP header and Fields that is
available on this packet when it was
received and the outbound pdu detail is
showing the similar information but when
this packet is going to be sent out of
one of the ports
now let's go back to the OSI model
and let's go to the challenge mode
the challenge mode will challenge you on
your understanding of the USI model and
will give you a few questions about each
layer of the OSI model
I have been given a question and I have
the ability to have a hint if I click
hint a hint will appear for me in here
if I click the hint again this window
will disappear and if I hover my mouse
over this answers some hands will appear
for me as well
now let's select an answer
and click the next layer so we can
process our answer was correct so it
went to the next layer now let's I have
the same answer click on next layer and
my answer was correct and that's why I
was able to move to layer 3. now if I
click on next layer my answer is not
correct and that's why I cannot move
further let me resize this window
so that you can see I'm not sure why
this area is not resizing but it's
supposed to tell us that the answer is
not correct
once I've answered all of the questions
I will get this message congratulations
I have successfully completed this
Challenge and that's it I can close the
challenge mode
and that's it for this episode everyone
I hope this has been informative for you
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