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Unformatted text preview: Data Communication & Computer Networks : Instructor: Shahzad Malik/Suffian Shiekh/ Zafar Hadier Lab Coordinator: Shoieb Arshad LAB No. 1 Introduction to Networks and Networking Commands in a) Windows b) Linux 1. Objective : The lab is intended to familiarize the students with the networking commands used in windows and linux environments for debugging network related issues. At the end of the lab the student must know: Local Loop Address and its purpose How to find IP address of a machine's NIC How to find MAC (Physical) address of machine's NIC Name Server lookup How to display arp table How to display routing table How to display TCP/IP sockets inuse How to list the machines on the network How to find MAC address of a remote machine IP address How to find MAC address of a remote machine from host name 2. Theory : 2.1 OSI Model : ISO-OSI model has a layered architecture. Model defines 7 layers. Each layer performs its specific task, hiding the details and complexities of its layer from other layers. Division of the bigger task into smaller subtasks makes it manageable and flexible. Protocol at any layer can be changed without affecting the other layers. Each layer takes and provides services to/from adjacent upper and lower layers. OSI Model Data unit Layer Function Host layers Data 7. Application Network process to application 6. Presentation Data representation and encryption 5. Session Interhost communication Segment 4. Transport End-to-end connections and reliability Media layers Packet 3. Network Path determination and logical addressing Frame 2. Data Link Physical addressing (MAC & LLC) Bit 1. Physical Media, signal and binary transmission 2.2. IP Address : An Internet Protocol (IP) address is a numerical identification (logical address) that is assigned to devices participating in a computer network utilizing the Internet Protocol for communication between its nodes. Although IP addresses are stored as binary numbers, they are usually displayed in human- readable notations, such as 126.96.36.199 (for IPv4), and 2001:db8:0:1234:0:567:1:1 (for IPv6). The role of the IP address has been characterized as follows: "A name indicates what we seek. An address indicates where it is. A route indicates how to get there."[ wikipedia.org ] 2.3. MAC Address : In computer networking, a Media Access Control address (MAC address), Ethernet Hardware Address (EHA), hardware address, adapter address or physical address is a quasi-unique identifier assigned to most network adapters or network interface cards (NICs) by the manufacturer for identification. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number. [ wikipedia.org ] 2.4. Loop-back Address : The term loopback (sometimes spelled loop-back) is generally used to describe methods or procedures of routing electronic signals, digital data streams, or other flows of items, from their originating facility quickly back to the same...
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This note was uploaded on 01/16/2010 for the course EE 243 taught by Professor Hgf during the Spring '09 term at COMSATS Institute Of Information Technology.
- Spring '09