LAB MANUAL for Computer Network
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Shutdown Script for Retropie
Shutdown Script for Retropie Use pin number 5 & 14 for “Shutdown” 1. Update RetroPie: • sudo apt-get update 2. Upgrade RetroPie • sudo apt-get upgrade 3. Install Python • sudo apt-get install python-dev • sudo apt-get install python3-dev • sudo apt-get install gcc • sudo apt-get install python-pip 4. Next you need to get RPi.GPIO: • wget https://pypi.python.org/packages/source/R/RPi.GPIO/RPi.GPIO-0.5.11.tar.gz 5. Extract the packages: • sudo tar -zxvf RPi.GPIO-0.5.11.tar.gz 6. Move into the newly created directory: • cd RPi.GPIO-0.5.11 • 7. Install the module by doing: • sudo python setup.py install • sudo python3 setup.py install 8. Creating a directory to hold your scripts: • mkdir /home/pi/scripts 9. Call our script shutdown.py (it is written in python). Create and edit the script by doing: • sudo nano /home/pi/scripts/shutdown.py The content of the script: Paste it in the blank area #!/usr/bin/python import RPi.GPIO as GPIO import time import subprocess # we will use the pin numbering to match the pins on the Pi, instead of the # GPIO pin outs (makes it easier to keep track of things) GPIO.setmode(GPIO.BOARD) # use the same pin that is used for the reset button (one button to rule them all!) GPIO.setup(5, GPIO.IN, pull_up_down = GPIO.PUD_UP) oldButtonState1 = True while True: #grab the current button state buttonState1 = GPIO.input(5) # check to see if button has been pushed if buttonState1 != oldButtonState1 and buttonState1 == False: subprocess.call("shutdown -h now", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) oldButtonState1 = buttonState1 time.sleep(.1) Press CRTL X Then Y and Enter 10. -
Ethernet Switches and Crossover Cables
Ethernet Switch A switch is something that is used to turn various electronic devices on or off. However, in computernetworking, a switch is used to connect multiple computers with each other. Since it is an external device it becomes part of the hardware peripherals used in the operation of a computer system. This connection is done within an existing Local Area network (LAN) only and is identical to an Ethernet hub in terms of appearance, but with more intelligence. These switches not only receive data packets, but also have the ability to inspect them before passing them on to the next computer. That is, they can figure out the source, the contents of the data, and identify the destination as well. As a result of this uniqueness, it sends the data to the relevant connected system only, thereby using less bandwidth at high performance rates. The first Ethernet network switch was pioneered by Kalpana (computer networking equipmentmanufacturing company in Silicon Valley established by an entrepreneur of Indian origin, Vinod Bharadwaj) in 1990. Switches operate at Layer 2 of the OSI Model; the Data-Link Layer. This is in contrast to routers, which operate at Layer 3 of the OSI Model, the Network Layer. A switch stores the MAC Address of each and every device which is connected to it. The switch will then evaluate every frame that passes through it. The switch will examine the destination MAC Address in each frame. Based upon the destination MAC Address, the switch will then decide which port to copy the frame to. If the switch does not recognize the MAC Address, it will not know which port to copy the frame to. -
Cisco Telepresence Codec SX20 API Reference Guide
Cisco TelePresence SX20 Codec API Reference Guide Software version TC6.1 April 2013 Application Programmer Interface (API) Reference Guide Cisco TelePresence SX20 Codec D14949.03 SX20 Codec API Reference Guide TC6.1, April 2013. 1 Copyright © 2013 Cisco Systems, Inc. All rights reserved. Cisco TelePresence SX20 Codec API Reference Guide What’s in this guide? Table of Contents Introduction Using HTTP ....................................................................... 20 Getting status and configurations ................................. 20 TA - ToC - Hidden About this guide .................................................................. 4 The top menu bar and the entries in the Table of Sending commands and configurations ........................ 20 text anchor User documentation ........................................................ 4 Contents are all hyperlinks, just click on them to Using HTTP POST ......................................................... 20 go to the topic. About the API Feedback from codec over HTTP ......................................21 Registering for feedback ................................................21 API fundamentals ................................................................ 9 Translating from terminal mode to XML ......................... 22 We recommend you visit our web site regularly for Connecting to the API ..................................................... 9 updated versions of the user documentation. Go to: Password ........................................................................ -
Adding a Shutdown Button to the Raspberry Pi B+ Version 1
Welcome, Guest Log in Register Activity Translate Content Search within content, members or groups Search Topics Resources Members Design Center Store All Places > Raspberry Pi > Raspberry Pi Projects > Documents Adding a Shutdown Button to the Raspberry Pi B+ Version 1 Created by ipv1 on Aug 4, 2015 3:05 AM. Last modified by ipv1 on Aug 18, 2015 9:52 AM. Introduction What do you need? Step 1. Setup the RPi Step 2. Connecting the button Step 3. Writing a Python Script Step 4. Adding it to startup Step 5. More to do Introduction For a beginner to the world of raspberry pi, there are a number of projects that can become the start of something big. In this article, I discuss such a simple project which is adding a button that can be used to shutdown the raspberry pi using a bit of software tinkering. I wrote a similar article in 2013 at my blog “embeddedcode.wordpress.com” and its got its share of attention since a lot of people starting out with a single board computer, kept looking for a power button. Additionally, those who wanted a headless system, needed a way to shutdown the computer without the mess of connecting to it over the network or attaching a monitor and keyboard to it. In this article, I revisit the tutorial on how to add a shutdown button while trying to explain the workings and perhaps beginners will find it an amusing to add find more things to do with this little recipe. What do you need? Here is a basic bill of materials required for this exercise. -
Introduction to Linux – Part 1
Introduction to Linux – Part 1 Brett Milash and Wim Cardoen Center for High Performance Computing May 22, 2018 ssh Login or Interactive Node kingspeak.chpc.utah.edu Batch queue system … kp001 kp002 …. kpxxx FastX ● https://www.chpc.utah.edu/documentation/software/fastx2.php ● Remote graphical sessions in much more efficient and effective way than simple X forwarding ● Persistence - can be disconnected from without closing the session, allowing users to resume their sessions from other devices. ● Licensed by CHPC ● Desktop clients exist for windows, mac, and linux ● Web based client option ● Server installed on all CHPC interactive nodes and the frisco nodes. Windows – alternatives to FastX ● Need ssh client - PuTTY ● http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html - XShell ● http://www.netsarang.com/download/down_xsh.html ● For X applications also need X-forwarding tool - Xming (use Mesa version as needed for some apps) ● http://www.straightrunning.com/XmingNotes/ - Make sure X forwarding enabled in your ssh client Linux or Mac Desktop ● Just need to open up a terminal or console ● When running applications with graphical interfaces, use ssh –Y or ssh –X Getting Started - Login ● Download and install FastX if you like (required on windows unless you already have PuTTY or Xshell installed) ● If you have a CHPC account: - ssh [email protected] ● If not get a username and password: - ssh [email protected] Shell Basics q A Shell is a program that is the interface between you and the operating system -
Windows Command Prompt Cheatsheet
Windows Command Prompt Cheatsheet - Command line interface (as opposed to a GUI - graphical user interface) - Used to execute programs - Commands are small programs that do something useful - There are many commands already included with Windows, but we will use a few. - A filepath is where you are in the filesystem • C: is the C drive • C:\user\Documents is the Documents folder • C:\user\Documents\hello.c is a file in the Documents folder Command What it Does Usage dir Displays a list of a folder’s files dir (shows current folder) and subfolders dir myfolder cd Displays the name of the current cd filepath chdir directory or changes the current chdir filepath folder. cd .. (goes one directory up) md Creates a folder (directory) md folder-name mkdir mkdir folder-name rm Deletes a folder (directory) rm folder-name rmdir rmdir folder-name rm /s folder-name rmdir /s folder-name Note: if the folder isn’t empty, you must add the /s. copy Copies a file from one location to copy filepath-from filepath-to another move Moves file from one folder to move folder1\file.txt folder2\ another ren Changes the name of a file ren file1 file2 rename del Deletes one or more files del filename exit Exits batch script or current exit command control echo Used to display a message or to echo message turn off/on messages in batch scripts type Displays contents of a text file type myfile.txt fc Compares two files and displays fc file1 file2 the difference between them cls Clears the screen cls help Provides more details about help (lists all commands) DOS/Command Prompt help command commands Source: https://technet.microsoft.com/en-us/library/cc754340.aspx. -
Disk Clone Industrial
Disk Clone Industrial USER MANUAL Ver. 1.0.0 Updated: 9 June 2020 | Contents | ii Contents Legal Statement............................................................................... 4 Introduction......................................................................................4 Cloning Data.................................................................................................................................... 4 Erasing Confidential Data..................................................................................................................5 Disk Clone Overview.......................................................................6 System Requirements....................................................................................................................... 7 Software Licensing........................................................................................................................... 7 Software Updates............................................................................................................................. 8 Getting Started.................................................................................9 Disk Clone Installation and Distribution.......................................................................................... 12 Launching and initial Configuration..................................................................................................12 Navigating Disk Clone.....................................................................................................................14 -
Rudiments of Routing
Rudiments of Routing Moving bits from the source to the destination is a major function of computer networking. On the current Internet, the Network layer is responsible for achieving this. AS 2 AS 1 Inter-domain routing OSPF and RIP Inter-domain routing OSPF and RIP Intra-domain routing BGP In general, most routing within Autonomous Systems use Routing Information Protocol (RIP), or its enhanced version Open Shortest Path First (OSPF). The current de facto Intra-domain routing standard is Border Gateway Protocol(BGP), Version 4. You need to concern yourself with these protocols if you are dealing with routers inside or between Autonomous Systems. At the host level, however, most likely you need only a static routing table. This is a table of routes that the OS kernel keeps. It is possible to add to and delete from routes in the kernel routing table relatively easily. We discuss routing tables based on RIP (RFC2453). When looking at routing tables, remember that most Unix-like operating systems use mnemonic names for their interfaces. For example, in Linux, the Ethernet interfaces on a machine are called eth0, eth1, eth2, etc. On the newer SUN/Solaris machines the interfaces are named eri0, eri1, etc. PPP interfaces are usually names ppp0, ppp1 etc. You can see all the configured interfaces on a host using the ifconfig command which is usually found in /sbin/ directory (but not always). You can see the routing table with ªnetstat -rº command. Here©s a screen shot of these commands run on matrix.newpaltz.edu which is a SUN/Solaris machine: The output from /sbin/ifconfig command shows that there are two configured interfaces, one an Ethernet and the other the loopback interface. -
Mac Keyboard Shortcuts Cut, Copy, Paste, and Other Common Shortcuts
Mac keyboard shortcuts By pressing a combination of keys, you can do things that normally need a mouse, trackpad, or other input device. To use a keyboard shortcut, hold down one or more modifier keys while pressing the last key of the shortcut. For example, to use the shortcut Command-C (copy), hold down Command, press C, then release both keys. Mac menus and keyboards often use symbols for certain keys, including the modifier keys: Command ⌘ Option ⌥ Caps Lock ⇪ Shift ⇧ Control ⌃ Fn If you're using a keyboard made for Windows PCs, use the Alt key instead of Option, and the Windows logo key instead of Command. Some Mac keyboards and shortcuts use special keys in the top row, which include icons for volume, display brightness, and other functions. Press the icon key to perform that function, or combine it with the Fn key to use it as an F1, F2, F3, or other standard function key. To learn more shortcuts, check the menus of the app you're using. Every app can have its own shortcuts, and shortcuts that work in one app may not work in another. Cut, copy, paste, and other common shortcuts Shortcut Description Command-X Cut: Remove the selected item and copy it to the Clipboard. Command-C Copy the selected item to the Clipboard. This also works for files in the Finder. Command-V Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder. Command-Z Undo the previous command. You can then press Command-Shift-Z to Redo, reversing the undo command. -
Cisco Router Block Wan Request
Cisco Router Block Wan Request Equalitarian Fletcher sometimes daggled any aftershock unchurch conceptually. Computational Felix never personifies so proficiently or blame any pub-crawl untunably. Precedential and unsupervised Scott outspoke while cephalic Ronny snag her midlands weak-mindedly and kotows unsafely. Can you help me? Sometime this edge can become corrupted and needs to be cleared out and recreated. Install and Tuning Squid Proxy Server for Windows. Developed powerful partnerships with each physical network address on wan request. Lot we need to wan request to establish a banner for each nic ip blocks java applets that you find yourself having different. Proxy will obscure any wan cisco require a banner for yourself inside network address in its child and password: select os of attacks? Authorized or https, follow instructions below and see if a cisco and share your isp and sends vrrp advertisements, surf a traveling businesswoman connects after migration done on. Iax trunk on vpn for ospf network devices and how will have three profiles to be found over time a routing towards internet security profile. Pfsense box blocks as your wan cisco router request cisco router block wan requests specifically for commenting. Centralize VLAN, outbound policy, firewall rules, configuration profiles and more in minutes. Uncheck block cisco router wan request check box displays detailed statistics: wan request through our go. Fragmentation is choppy and asa would be the cisco request to content; back of connect wan rules for outside world? Is to configure static content on the result in theory this may block cisco wan router request check out ping requests. -
Oracle® Solaris 11.4 Network Administration Cheatsheet
Oracle Solaris 11.4 Network Administration Cheatsheet This cheatsheet includes examples of commonly used network administration commands. See the dladm(8), ipadm(8), and route(8) man pages for further details. For more information about configuring the network in Oracle Solaris 11.4, see Configuring and Managing Network Components in Oracle Solaris 11.4. Commonly Used Network Administration Commands Note - Some of following commands include parameters and values that are provided as examples only. Action Command Administering Datalinks Display all of the datalinks (physical and virtual) on a system. # dladm show-link Display all of the physical datalinks on a system. # dladm show-phys Display all of the properties for all of the datalinks on a system. # dladm show-linkprop Display all of the properties for a specific datalink on a system. # dladm show-linkprop net0 Display a specific property for a specific datalink on a system. # dladm show-linkprop -p mtu net0 Administering IP Interfaces and Addresses Display general information about a system's IP interfaces. # ipadm Display a system's IP interfaces and addresses. # ipadm show-addr Create an IP interface and then configure a static IPv4 address for that interface. # ipadm create-ip net0 # ipadm create-addr -a 203.0.113.0/24 net0/addr Obtain an IP address from a DHCP server. # ipadm create-ip net0 # ipadm create-addr -T dhcp net0/addr Create an auto-generated IPv6 address. # ipadm create-ip net0 # ipadm create-addr -T addrconf net0/addr Change the netmask property for an IP address object name (net3/v4) to 8. # ipadm set-addrprop -p prefixlen=8 net3/v4 Configure a persistent default route on a system. -
AWS Site-To-Site VPN User Guide AWS Site-To-Site VPN User Guide
AWS Site-to-Site VPN User Guide AWS Site-to-Site VPN User Guide AWS Site-to-Site VPN: User Guide Copyright © Amazon Web Services, Inc. and/or its affiliates. All rights reserved. Amazon's trademarks and trade dress may not be used in connection with any product or service that is not Amazon's, in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by Amazon. AWS Site-to-Site VPN User Guide Table of Contents What is Site-to-Site VPN ..................................................................................................................... 1 Concepts ................................................................................................................................... 1 Working with Site-to-Site VPN ..................................................................................................... 1 Site-to-Site VPN limitations ......................................................................................................... 2 Pricing ...................................................................................................................................... 2 How AWS Site-to-Site VPN works ........................................................................................................ 3 Site-to-Site VPN Components .....................................................................................................