Loading ...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 [...]
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: Sorry you have no rights to view this post! [This content is only available for our VIP member].
The TCP/IP Model
Saturday, April 11th, 2009TCP/IP and the OSI Reference Model As illustrated in Figure 1.2, the TCP/IP model consists of four layers, each of which can have several sublayers. These layers correlate roughly to layers in the OSI reference model and define similar functions. Some of the TCP/IP layers correspond directly with layers in the OSI reference model while [...]
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 [...]
CCNA Quick Notes – Frame Relay
Friday, April 3rd, 20091.What protocol does Frame Relay rely on for error checking? Frame Relay does not rely on any certain protocol for error checking. Instead, it relies on upper-layer protocols to provide error checking. For example, Frame Relay relies on TCP to provide error checking in an IP network. 2.At what layers of the OSI model does [...]
CCNA Quick Notes – Internetworking
Friday, April 3rd, 20091.What are the three layers of the Cisco Hierarchical Model? The three layers of the Cisco Hierarchical Model are:1 The access layer The distribution layer The core layer 2.In the Cisco Hierarchical Model, what is the function of the access layer? Sometimes referred to as the desktop layer, the access layer is the point at [...]
CCNA Quick Notes – LAN
Friday, April 3rd, 20091. What is carrier sense multiple access collision detect (CSMA/CD)? CSMA/CD describes the Ethernet access method. In CSMA/CD, many stations can transmit on the same cable, and no station has priority over any other. Before a station transmits, it listens on the wire to make sure no other station is transmitting. If no other station [...]