Network Fundamentals - SIM for Week 4 PDF

College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City...

College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 CO 2: Apply network hardware components used to establish network communication. Week 4-5: Unit Learning Outcomes (ULO): at the end of the unit, you are expected to 4. Troubleshoot simple network problems using the TCP/IP commands and create LAN cables both straight-through and cross-over. BIG PICTURE in Focus: ULO 5. Troubleshoot simple network problems using the TCP/IP commands and create LAN cables both straight-through and cross-over.. Metalanguage In this section, we will learn the various networking terms such as: TCP/IP refers to the standard Internet protocol that stands for Transmission Control Protocol/Internet Protocol that allow digital computers to communicate to each other over a long distances. OS Utilities refers to the software that incorporated in the OS that coordinates with the activities and functions of hardware and software and it controls the operations of computer hardware. Network and Internet Utility contains all the tools to check the status of the network, change settings, set preferences for sharing files and computer, configure internet connections. Essential Knowledge To attain the aforesaid big picture (unit learning outcomes 5) for the fifth week of the course, you need to fully understand the importance of the Operating system utilities and the TCP/IP commands that you can use to fix simple network problems. Those with internet connection can download the lecture materials uploaded in the BB LMS and you can research through online databases like ebrary, or proquest in the UM LIC portal to access the references listed in the syllabus. Let’s Begin Let us recap the utilities mentioned in the previous week after installing the operating system.  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 OS Utilities software incorporated in the OS that coordinates with the activities and functions of hardware and software and it controls the operations of computer hardware. It helps manage, maintain and control computer resources. Device Manager a troubleshooting tool that allows the users to: 1. view which devices attached to the computer have problems and control the hardware attached to the computer 2. Manage drivers and hardware specifications 3. Disable specific pieces of hardware. System and Security allows reviewing computer’s status and resolving issues, checking firewall status, status of RAM and processor, check device manager, checks for updates, backing-up and restoring files, protect computer thru bitlocker, and manage PC thru the administrative tools Network & Internet  is the second category under the Control Panel and contains all the tools to check the status of the network, change settings, set preferences for sharing files and computers, configure Internet connections  protects your system from any malicious software and allows reconfiguration of network settings. TCP/IP Commands  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 TCP – is a protocol that enables a computer to send data to a remote computer. IP – is the underline protocol for all the other protocols in the TCP/IP protocol suite. IP defines the means to identify and reach a target computer on the network. Some of the protocols included in the TCP/IP suite are: ARP (Address Resolution Protocol) – used to associate an IP address with a MAC address. IP (Internet Protocol) – used to deliver packets from the source host to the destination host based on the IP addresses. ICMP (Internet Control Message Protocol) – used to detects and reports network error conditions. Used in ping. TCP (Transmission Control Protocol) – a connection-oriented protocol that enables reliable data transfer between two computers. UDP (User Datagram Protocol) – a connectionless protocol for data transfer. Since a session is not created before the data transfer, there is no guarantee of data delivery. FTP (File Transfer Protocol) – used for file transfers from one host to another. Telnet (Telecommunications Network) – used to connect and issue commands on a remote computer. DNS (Domain Name System) – used for host names to the IP address resolution. HTTP (Hypertext Transfer Protocol) – used to transfer files (text, graphic images, sound, video, and other multimedia files) on the World Wide Web. TCP/ IP Commands are system commands used in analyzing and troubleshooting a particular networking issues. IPConfig  Display the network adapter configuration  Display the basic network configuration changes and reset certain facets of DHCP and DNS  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 ipconfig attributes /all Display full configuration information /renew Renew the IPv4 address for the specified adapter or renew an IPv4 address from a DHCP server /renew6 Renew the IPv6 address for the specified adapter renew an IPv6 address from a DHCP server /release Release / delete the IPv4 address for the specified adapter /release6 Release/delete the IPv6 address for the specified adapter /flushdns Purges / remove the DNS resolver cache /displaydns Display the contents of the DNS resolver cache  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 PING Used to test the following: connectivity to other hosts existence of other hosts on the networks. ping attribute -t Ping the specified host until stopped Ctrl C or Ctrl Break -a Resolve addresses to hostnames -n count Number of echo request to sent -l size Send buffer size - r count Record route for count hops (IPv4-only) -s count Timestamp for count hops (IPv4-only) -4 Force using IPv4 -6 Force using IPv6 ARP (Address Resolution Protocol) Used for mapping an Internet Protocol address (IP address) to a physical machine address that is recognized in the local network. arp attributes - a or -g To view the IP address to MAC address table -s Adds the host and associates the Internet address inetaddr with the Physical address eth addr. netstat is a useful tool for checking your network configuration and activity.  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 netstat attribute -a Displays all connections and listening ports. -n Displays addresses and port numbers in numerical form. -r Displays the routing table. -an Displays the list of all the connections to and from your computer in numeric format -s provides statistics about incoming and outgoing traffic tracert Shows the path to a destination on another network thru a number of hops and number of ms per hop. tracert attribute -d do not resolve addresses to hostname -h Shows the maximum hops NSLOOKUP Is a network administration command-line to obtain the domain name or IP address mapping or for any specific DNS record. Used to troubleshoot DNS related problems This will use the domain server that is currently configured in the system To illustrate on how to use nslookup: 1. Find the IP address of a host 2. Find the domain name of an IP address 3. Find mail servers for a domain Example: To find the IP address of a host try:  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 C:\>nslookup www.google.com For an interactive lookup, try: C:\>nslookup - It will give you the server, address, name of dns and its address You can also try: C:\> nslookup Let’s Check: Quiz Instruction: Answer the short quiz in the BB LMS. Let’s Analyze: Laboratory Activity 3 – TCP/IP Commands Open your computer, then perform the following scenario below, after performing, do a screenshot. Submit the file named Lab5Lastname.pdf to BB LMS. Scenario 1: You have a copy of Raya movie in your laptop and want to share it to the laptop of your brother or sister at home. Both of your laptops are connected to the Wi-fi connection at home. You already shared the file, but your brother cannot access it. You suspect that the file and printing sharing is turned off. What will you do to turned on the file and printer sharing of your laptop? Scenario 2: Your laptop cannot connect to the Internet, but your cellphone and your brother’s computer have able to connect to the Internet. What will you do to check the IP configuration of your laptop using the TCP/IP command?  College of Computing Education 2ndFloor, DPT Building Matina Campus, Davao City Telefax: (082) Phone No.: (082)300-5456/305-0647 Local 118 Scenario 3. You want to check if your laptop is connected to a network, what TCP/IP command you will use to do this? Scenario 4. You and your friend are in the Internet Café and both of you are aware that you have downloaded a file that contains a virus that might affect the function of the computer system. What will you do to avoid traces of accessing the domain name? Scenario 5. You wanted to check the response time and the number of hops your computer will respond upon accessing the www.lazada.com. What TCP/IP command you will use? In a Nutshell How important are the TCP/IP commands, the guided and unguided media in a network?