Troubleshooting a “Broken LAN” Telecommunications and Networking Troubleshooting a “Broken LAN”

Networking Basic Diagram © UNT in Partnership with TEA

32 Bit Dotted Decimal Number: IP Address 32 Bit Dotted Decimal Number: 0-255.0-255.0-255.0-255 Decimal Number Range Octet Octet Octet Octet Binary Equivalent (Either 0 or 1) 00000000.00000000.00000000.00000000 © UNT in Partnership with TEA

Network ID RED- Bits associated with the Network ID, must remain intact for routing through the Internet Black- Bits associated with individual hosts on the network. These bits can be used to assign host addresses on the network Class A Address 11111111.00000000.00000000.00000000 Class B Address 11111111.11111111.00000000.00000000 Class C Address 11111111.11111111.11111111.00000000 © UNT in Partnership with TEA

Basic Networking Terms Straight-Through Cable- An Ethernet cable used in networks which connect unlike devices (ex.- PC to Switch, PC to Hub) Cross Connect Cable- An Ethernet cable used in networks which connect like devices (ex. – PC to PC, Hub to Hub) Console Cable- An Ethernet cable used in networks which connect a PC to a console port of a router or switch and allows configuration to take place. Router- A network device which routs IP packets through the Internet based on the network IP address. Switch- A network device which routs network frames to their specific MAC destination address. NIC (Network Internet Card)- An adapter card which, when inserted into a computer or laptop, allows an Internet connection to that device. Packet- A packet is a unit of information which is routed through the Internet by routers. Frame- A frame is a container of data within a packet which is reviewed and sorted to individual hosts on a network by a switch. Peer to Peer Network- The simplest form of a network where a host is acting as both client and server on the network. Client-Server Network- A network where there is a central control of all network services (server) to network hosts (clients). © UNT in Partnership with TEA

Lab Diagram Set up the following equipment for each of the groups: Router Straight- Thru Cable Switch Straight- Thru Cable Hub (3) Straight- Thru Cables (3) CPU’s- with Operating Systems, Working NIC’s © UNT in Partnership with TEA

Instructions Configure all equipment with IP addresses including: Router: Gateway Network ID/ Subnet Mask CPU’s: IP Address/Subnet Mask Default Gateway TCP/IP Protocol Suite © UNT in Partnership with TEA

Instructions- Cont. All other CPU’s Connect all cables Check system by use of “ping” to: All other CPU’s Default Gateway After ensuring correct functions, create errors in the network by doing any or all of the following: Change IP addresses of a CPU or Default Gateway to be non compatible with rest of network Use incorrect or damaged cable for any of the connections Change Subnet Mask or Network ID in router © UNT in Partnership with TEA

Instructions- Cont. Allow students to investigate the LAN in order to find out possible errors in the network Students should then repair the problem Students should then document the entire process on a Lab Report Form © UNT in Partnership with TEA