lab manuals for computer networks,software engineering, Study notes of Computer Networks

Download lab manuals for computer networks,software engineering and more Study notes Computer Networks in PDF only on Docsity! COMPUTER NETWORKS LAB Manual Experiment No.1 Title: - Study of different types of Network cables and practically implement the cross-wired cable and straight through cable using clamping tool.  Objective: - Students will understand concepts of Cabling  S/W Requirement: - NA   H/W Requirement :- RJ-45 connector, wire and climping tool Step 1: Strip the cable jacket about 1.5 inch down from the end.  Step 2: Spread the four pairs of twisted wire apart. For Cat 5e, you can use the pull string to strip the jacket farther down if you need to, then cut the pull string. Cat 6 cables have a spine that will also need to be cut. Step 3: Untwist the wire pairs and neatly align them in the T568B orientation. Be sure not to untwist them any farther down the cable than where the jacket begins; we want to leave as much of the cable twisted as possible. Step 4: Cut the wires as straight as possible, about 0.5 inch above the end of the jacket. Step 5: Carefully insert the wires all the way into the modular connector, making sure that each wire passes through the appropriate guides inside the connector. Step 6: Push the connector inside the crimping tool and squeeze the crimper all the way down. Step 7: Repeat steps 1-6 for the other end of the cable. Step 8: To make sure you've successfully terminated each end of the cable, use a cable tester to test each pin. When you're all done, the connectors should look like this: RESULT: Cross and Straight Cable Prepared Experiment No. 4   Title:- Configure and Understand working of network devices Hub, Switch, Routers Objective :- Students will understand working of network devices S/W Requirement :- Packet Tracer H/W Requirement :- 1. g. Celeron 2. •MainMemory - 128 MB RAM 3. •Hard Disk – minimum20 GB IDE Hard Disk 4. 44 MB Floppy Disk Drive –52X IDE CD-ROM Drive •PS/2 HCL Keyboard and Mouse Method:- 1. Attach requireddevices (Hub/Switch/Router) in the packettracer software. 2. Assign IP address to devices. 3. Select sourceand destination and drop packetfrom source to destination. 4. Go to Simulation mode and click capture/Play. 5. Simulation will start and packet will only be acceptedby destination.   RESULT: Students will understand functioning of various networking devices. Experiment No.5   Title:-    Implement different network topologies like Star, Bus and Mesh Topology with the help of packet tracer or NS2 software. Objective :- To understand Star, Bus and Mesh Topology S/W Requirement :- Packet Tracer or NS2 H/W Requirement :- 1. g. Celeron 2. •MainMemory - 128 MB RAM 3. •Hard Disk – minimum 20 GB IDE Hard Disk 4. 44 MB Floppy Disk Drive –52X IDE CD-ROM Drive •PS/2 HCL Keyboard and Mouse Method:- "Bus" topology implementation in Cisco Packet Tracer is again a simple configuration that has to be done. It is too simple to deal with the configuration here, in a way that all you need to do is to configure router correctly. Let's see how this works, following these steps: You will have to connect the network management system included. Now in order to configure the Router, we will follow this procedure. 2811 Router that we have used, have 3 fastEthernet ports, named 0/0 and 0/1. Currently the switch that has been attached to the router is along the fastEthernet 0/0 port.  Now, router on the other hand is connected to a PC directly via console cable, through console port from where we shall actually be configuring the router. Actual routers configuration require us to connect the routers through some programs like putty. Here are router configurations:  Enter the "global configuration" mode in the router. Router>enable Router#configure terminal Router(config-if)#clock rate 64000 Router(config-if)#bandwidth 64 Router(config-if)#no shutdown Experiment No.7   Title:- Configure a network using Distance Vector routing Protocol using Packet Tracer or NS2. Objective :- Understand Routing Mechanism S/W Requirement :- Packet Tracer or NS2 H/W Requirement :- 1. g. Celeron 2. •MainMemory - 128 MB RAM 3. •Hard Disk – minimum 20 GB IDE Hard Disk 4. 44 MB Floppy Disk Drive –52X IDE CD-ROM Drive •PS/2 HCL Keyboard and Mouse Method: RIP Configuration Basic Configuration RouterA(config)# router rip RouterA(config-router)# version 2 RouterA(config-router)# no auto- summary RouterA(config-router)# network 10.0.0.0 RouterA(config-router)# network 192.168.1.0 Modifying Updates   RIP uses hop count as the metric and we can only modify it using the offset-list feature which is covered in detail in Routing Filtering & Manipulation. It must be noted that offset-list feature is a protocol independent feature used for other routing protocols as well such as EIGRP. However parameters and characteristics of a RIP routing update can be modified. By default RIP version 2 updates are multicast and we can configure a Router to unicast these updates.  RouterA(config)# router rip RouterA(config-router)# neighbor 192.168.1.2 RouterA(config-router)# passive-interface fa0/0 The neighbor commands instructs RIP to send unicast routing updates to the specified neighbor and the passive-interface command is used to suppress multicast updates out that interface. This is usually used when a router connects on multi-access segment and we want to exchange RIP information with only a specific neighbor.   We can also modify various timers associated with RIP such as the update timer which defines the rate in seconds at which RIP updates are sent. Below is the command syntax to modify various timers used by RIP. RouterA(config)# router rip RouterA(config-router)# timer basic update invalid holddown flush  Result: Students will understand how packet travels in network if RIP is configured as routing protocol.