Module 12 - Network Troubleshooting

Check all that apply about PHYSICAL TOPOLOGY

• The layout can be modified based on needs.

• It is the actual route concerned with transmission.

• It can be arranged in star, ring, mesh, and bus topologies.

• Depicts logistics of network concerned with transmission of data.

Troubleshooting approaches: attempts to resolve the problem by comparing a nonoperational element with the working one.

• Comparison

• Educated guess

• Follow-the-path

• Divide-and-conquer

Cisco IOS commands: sends an echo request packet to an address, then waits for a reply.

• ssh - 1 user-id ip-address

• ping {host | ip-address}

• telnet {host | ip-address}

• debug

Cisco IOS commands: displays a summary status of all interfaces on a device.

• traceroute

• debug

• show protocols

• show ip interface brief | show ipv6 interface brief

Troubleshooting approaches: good approach to use when the problem is suspected to be a physical one.

• Comparison

• Substitution

• Bottom-Up

• Top-Down

Hardware troubleshooting tools: specialized device used for troubleshooting switched networks and VLANs.

• Cable Testers

• Portable Network Analyzers

• Cable Analyzers

• Digital Multimeters

Application layer protocols: connects to mail servers and downloads email.

• NFS

• DNS

• POP

• FTP

Hardware troubleshooting tools: handheld devices are designed for testing the various types of data communication cabling.

• Cable Testers

• Cisco Prime NAM

• Cable Analyzers

• Digital Multimeters

Application layer protocols: performs interactive file transfers between hosts.

• NFS

• DNS

• POP

• FTP

Hardware troubleshooting tools: browser-based interface that displays device performance analysis in a switched and routed environment.

• Cable Analyzers

• Portable Network Analyzers

• Cable Testers

• CISCO Prime NAM