| Question 1 | Which of the following are features of a layered model? Choose 3. -
A. Each layer performs many functions. -
B. Each layer performs one specific function. -
C. Each layer is independent from the other layers . -
D. Each layer relies on the other layers for information. -
E. Each layer is present on both the sending and receiving hosts . -
F. Each layer does not need to be present on both the sending and receiving hosts because another layer will assume the responsibility if the layer does not exist. |
| A1: | Answers B, C, and E are correct. Each layer in a layered model has a specific purpose, is independent from the other layers, and is present on both the sending and receiving hosts. Answer A is incorrect because each layer in the TCP/IP model performs a specific function, not multiple functions. Answer D is incorrect because each layer is independent of the other layers in the protocol stack. Answer F is incorrect because each layer does exist on both the sending and receiving hosts. |
| Question 2 | Which of the following are advantages of using a layered model? Choose 2 -
A. Problem resolution is more difficult with a layered model. -
B. Problem resolution is made easier because the problem is modularized to a specific layer and can be traced to a particular protocol, such as IP. -
C. Changes can be made to a layer without affecting the other layers. -
D. Changes to one layer require changes to other layers. -
E. The layered model is more complex because it creates many smaller functions. |
| A2: | Answers B and C are correct. A layered model offers the advantages of making problem resolution easier because of the modular nature of the model and, because the layers are independent of each other, changes can be made to one layer without affecting the other layers. Answer A is incorrect because breaking the model down into a number of layers makes problem resolution easier. Answer D is incorrect because each layer is independent of the other layers, so that changes made to one layer do not affect the other layers. Answer E is incorrect because the modular approach to the layered model simplifies the issue of network communication. |
| Question 3 | Which layer in the TCP/IP model handles sequencing of messages and ensures end-to-end delivery? |
| A3: | Answer D is correct. The Transport layer handles the sequencing of messages and ensures end-to-end delivery. Answer A is incorrect because this layer interacts with the running application. Answer B is incorrect because this layer is responsible for the routing of data to the destination host. Answer C is incorrect because this layer provides the communication service across the network. |
| Question 4 | Which layer in the TCP/IP model uses the MAC address as its basis for addressing purposes? |
| A4: | Answer C is correct. The Network Interface layer uses the MAC address as its basis for addressing purposes. Answer A is incorrect because this layer does not use addressing. Answer B is incorrect because this layer uses IP addressing. Answer D is incorrect because this layer does not use addressing; it only specifies the port to use. |
| Question 5 | At which layer in the TCP/IP model would you find the Telnet protocol being used? |
| A5: | Answer A is correct. The Telnet protocol would be found in the Application layer of the TCP/IP model because this layer consists of applications that are run by users. Answer B is incorrect because this layer does not contain user applications; it handles the delivery and addressing of data. Answer C is incorrect because this layer does not contain user applications; it handles the end-to-end communication between hosts on a network. Answer D is incorrect because this layer does not contain user applications; it handles the physical transfer of data across the network. |
| Question 6 | At which layer in the TCP/IP model would you find the IP protocol being used? |
| A6: | Answer B is correct. The IP protocol would be found in the Internet layer of the TCP/IP model because this layer handles the delivery and addressing of data, which includes the IP and ICMP protocols. Answer A is incorrect because this layer contains user applications and does not use the IP protocol. Answer C is incorrect because this layer handles the end-to-end communication between hosts on a network and does not use the IP protocol. Answer D is incorrect because this layer handles the physical transfer of data across the network and does not use the IP protocol. |
