Cisco Systems CCNA 2 9.2 Network Testing

Some routing protocols support multiple paths to the same destination. Multipath algorithms

permit traffic over multiple lines, provide better throughput, and are more reliable. Discuss with

the students their ideas on why it would be better to have multiple paths through the network.

Discuss redundancy and reasons why all networks are not redundant.

9.2 Network Testing

Essential Labs: 9.2.6

Optional Labs: None

Core TIs: All

Optional TIs: none

Course-Level Claim: Students can use embedded Layer 3 through Layer 7 protocols to

establish, test, suspend, or disconnect connectivity to remote devices from the router console.

Certification Level Claim: Students can describe network communications in layered models,

perform simple LAN troubleshooting, and use the OSI model as a guide for systematic network

troubleshooting.

Hands-on skills: none

Basic testing of a network should move through each layer of the OSI reference model. Begin

with Layer 1 and work to Layer 7 if necessary. Instruct the students to look for simple solutions

first when they test a network. Some of the most common problems on IP network result from

errors in the addressing scheme. Reinforce how important IP addressing schemes are to a

network. Explain to students that a large part of their role in the workplace will require

troubleshooting.

Troubleshooting is a process that allows a user to find problems in a network. There should be

a structured or orderly process to troubleshooting based on the networking standards defined

by an administration. Documentation is a very important part of the troubleshooting process.

Emphasize to the students that documentation is important, but probably the least performed

task in network management. Have the students brainstorm ideas about why a structured

approach is important to troubleshooting. Discuss the ideas with the class.

Emphasize the two structured approaches explained in the curriculum. Since these are not the

only two approaches, instruct the students to work in groups and develop their own structured

approaches to troubleshooting. The students need to understand that the troubleshooting

process can create additional problems. To prevent this, make sure students know that they

should reverse any processes they use to solve the issue. Failure to do so can add to the

network problems.