Chapter 2
| 1: | What is ANSI, and what does it do? |
| A1: | Answer: ANSI is the acronym for the American National Standards Institute and is a U.S. governmental body responsible for approving U.S. standards in several categories, including computers and communications. |
| 2: | What is the ITU-T, and what does it do? |
| A2: | Answer: The ITU-T is the telecommunications standardization sector of the ITU (International Telecommunication Union) and is responsible for technical recommendations about telephone and data communications systems telecommunications carriers. |
| 3: | What is the IEEE, and what does it do? |
| A3: | Answer: The IEEE is the Institute of Electrical and Electronics Engineers and is the leading technical authority in several technology fields, such as computer engineering and electronics. |
| 4: | What does OSI stand for, and what is the OSI model? |
| A4: | Answer: OSI stands for Open System Interconnection. The OSI model is a model of network architecture and of the protocol suites across the network architecture. The OSI model was developed as a framework for international standards in various and diverse computer network architectures to be developed and implemented. |
| 5: | Describe and name the layers in the OSI model. |
| A5: | Answer: There are seven (7) layers in the OSI model: (7) application, (6) presentation, (5) session, (4) transport, (3) network, (2) data link, and (1) physical. |
| 6: | What are some advantages of a layered model approach to networking? |
| A6: | Answer: Whether it is the OSI model layers or the Hierarchical Design Model layers, the layered approach provides the same advantages: the compartmentalization of network functions. This compartmentalization enables vendors to develop and produce a specific product set, such as network hardware (routers, switches) or software (computer or network operating system). This same compartmentalization provides the network administrator a step-by-step approach to troubleshooting a network fault, and to isolating the failure from the rest of the network, such as implementing a failover path or replacing the hardware |
| 7: | What is the network standard for 10-Mbps Ethernet? 100-Mbps Ethernet? 1000-Mbps/Gigabit Ethernet? 10Gigabit Ethernet? |
| A7: | Answer: 10-Mbps Ethernet?IEEE 802.3 100-Mbps Ethernet?IEEE 802.3u 1-Gbps 1000-Mbps?IEEE 802.3z 10,000-Mbps/10-Gbps Ethernet?IEEE 802.3ae |
| 8: | What is encapsulation, and how does it work (in reference to the OSI model)? |
| A8: | Answer: Encapsulation is the process by which each layer of the OSI model wraps protocol information around the information received from the layer above. Each layer of the OSI model performs a specific function, adding that layer's information; based on this information, the receiving side knows what to do upon receipt of the data. |
