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CCNA 640-802 Bible – Identify Network Problems
Monday, July 6th, 20091. While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the [...]
CCNA 640-802 Bible – OSI and TCP Basic Operation
Friday, July 3rd, 20091. Why does the data communication industry use the layered OSI reference model? (Choose two.)
A:It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
B:It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
C:It supports the evolution of multiple competing [...]
CCNA 640-802 Bible – OSI and TCP/IP models
Friday, July 3rd, 20091. At which layers of the OSI model do WANs operate? (Choose two.)
A:application layer
B:session layer
C:transport layer
D:network layer
E:datalink layer
F:physical layer
Correct Answers: E, F
Explanation:
Tags: 640-802 Bible, CCNA, OSI, TCP/IP
The 7 Layer OSI Model
Saturday, April 11th, 2009The OSI Reference Model
The OSI is the Open System Interconnection reference model for communications. As illustrated in Figure 1.1, the OSI reference model consists of seven layers, each of which can have several sublayers. The upper layers of the OSI reference model define functions focused on the application, while the lower three layers define functions [...]