1.5 Troubleshoot a network

Question 1

1.5.1 Network Devices as Sources of Network Information

Answer 1

When documenting or diagnosing a network problem, it is often necessary to gather information directly from routers and switches. Obvious useful network commands include ping, traceroute, and telnet. There are also many show commands available to help verify a device operation.

Question 2

1.5.5 Measuring Network Throughput

Question 3

BANDWIDTH

Answer 3

Bandwidth is the theoretical amount of data that can be transmitted from one device to another in an amount of time. Bandwidth is typically measured in the number of bits per second.

Question 4

THROUGHPUT

Answer 4

Throughput is the measurement of the actual number of bits per second that are being transmitted across the media. Throughput is always lower than the specified bandwidth because traffic can encounter latency or delay during transmission.

Question 5

LATENCY

Answer 5

Latency may be caused by any number of issues specifically the physical distance between the source and destination. There are other factors as well, including the number of network devices encountered between source and destination. As data crosses multiple networks, it must be processed and forwarded by switches and routers.