SG Network Reference Models and Standards
Chapter 6
TRUE/FALSE
1. The Transport layer is the same in both the OSI model and the TCP/IP model.
2. The Physical layer has been divided into two sublayers, called the LLC sublayer and the MAC sublayer.
3. The Network layer communicates with the Data Link layer and the Session layer.
4. The maximum transmission unit for Ethernet is 1518 bytes.
5. One of the problems that can occur in the Network layer is the incorrect configuration of a hosts IP address.
MULTIPLE CHOICE
1. Which layer is responsible for establishing a connection between the source and destination?
| a. | Application |
| b. | Session |
| c. | Transport |
| d. | Presentation |
2. Which layer of the OSI model is responsible for encryption and decryption?
| a. | Application |
| b. | Presentation |
| c. | Session |
| d. | Transport |
3. Put the layers of the OSI model in order from layer 7 to layer 1.
a. Presentation
b. Network
c. Physical
d. Data Link
e. Transport
f. Application
g. Session
| a. | a., g., f., b., e., d., c. |
| b. | f., a., g., e., b., d., c. |
| c. | f., g., a., b., e., c., d. |
| d. | f., a., g., b., e., d., c. |
4. What is a PDU?
| a. | It is an Application layer protocol that handles delivery of messages. |
| b. | It is a unit of measurement for the maximum amount of data that can be transferred. |
| c. | It is the name given to the unit of information used by each layer. |
| d. | It is a Network layer protocol that handles path determination |
5. What information would you find in the header of a Transport layer PDU?
| a. | destination IP address |
| b. | cyclic redundancy check |
| c. | source MAC address |
| d. | window size |
6. At each layer of the OSI model, data is appended to the original message and then sent on to the next lower layer. What is this process called?
| a. | encapsulation |
| b. | deencapsulation |
| c. | packetization |
| d. | checkpointing |
7. What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device?
| a. | source port number |
| b. | window Size |
| c. | destination port number |
| d. | sequence number |
8. What is the IEEE standard that governs all forms of Ethernet media?
| a. | 802.11 |
| b. | 802.3 |
| c. | 802.15 |
| d. | 802.2 |
9. Which is the IEEE standard that sets the standards for wireless networking?
| a. | 802.16 |
| b. | 802.3 |
| c. | 802.15 |
| d. | 802.11 |
10. Which layer is responsible for determining the best path a packet should travel across an internetwork?
| a. | Network |
| b. | Transport |
| c. | Session |
| d. | Data Link |
11. One job that a router performs is that of gatekeeper, which means that it can be configured to only allow certain packets access into the network based on a list of rules. What is that process called?
| a. | media control |
| b. | packet forwarding |
| c. | access control |
| d. | signal bounce |
12. You are working at the help desk and you get a message that a user cannot access the Internet. You open a command prompt, ping the workstation’s IP address, and get a response. You ask the user to try the Internet again. He does so with the same result— no connection. Which type of device is most likely to be the problem?
| a. | Physical layer device |
| b. | Data Link layer device |
| c. | Network layer device |
| d. | Presentation layer device |
13. Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control sublayer?
| a. | Physical |
| b. | Data Link |
| c. | Network |
| d. | Transport |
14. What layer is responsible for making sure that the data that it sends and receives is in a format that the receiving and sending computers can understand?
| a. | 7 |
| b. | 6 |
| c. | 5 |
| d. | 4 |
15. At what layer do NICs operate?
| a. | Transport |
| b. | Data Link |
| c. | Physical |
| d. | Network |
16. Which layer is responsible for the encoding of signals?
| a. | 3 |
| b. | 1 |
| c. | 5 |
| d. | 7 |
17. The Transport layer segments data into smaller chunks, the size of which is determined by which of the following?
| a. | MTU |
| b. | LLC |
| c. | PDU |
| d. | TCP |
18. At which layer would you find errors that were caused by EMI?
| a. | Data Link |
| b. | Transport |
| c. | Physical |
| d. | Network |
MULTIPLE RESPONSE
1. How can you find out what your MAC address is? (Choose all that apply.)
| a. | Right-click on the Local Area Connection and choose status. |
| b. | Open a command prompt and type the command arp -d. |
| c. | Open a command prompt and type the command getmac. |
| d. | Open a command prompt and type the command ipconfig /all. |
2. Which of the following are protocols that you find at the Application layer of the OSI model?
| a. | TCP |
| b. | FTP |
| c. | ARP |
| d. | ICMP |
| e. | DHCP |
| f. | SNMP |
COMPLETION
1. The ____________ reference model is a general framework for networking systems that uses a layered approach to reduce its complexity.
2. The ____________ layer is the bottom layer, whose job it is to convert bits into signals and vice versa.
3. The process of stripping the header and trailer from a PDU is called ____________.
4. The PDU at the Data Link layer is called a ____________.
5. The ____________ layer of the TCP/IP model combines the top three layers of the OSI model into one layer.
MATCHING
| a. | Application layer |
| b. | Presentation layer |
| c. | Session layer |
| d. | Transport layer |
| e. | Network layer |
| f. | Data Link layer |
| g. | Physical layer |
| h. | Media Access Control sublayer |
| i. | Logical Link Control sublayer |
| j. | OSI reference model |
1. Switches operate at this layer.
2. Hubs operate at this layer.
3. Sublayer manages access to the physical medium.
4. Computers operate at this layer.
5. This sublayer is responsible for some error recovery.
6. This is the general framework for how networking systems should operate.
7. Routers operate at this layer.
8. This layer handles data formatting and translation.
9. This uses port numbers as source and destination identifiers
10. This handles communication setup and teardown.
SHORT ANSWER
1. What are the benefits to using a layered approach?
2. List the layers of the OSI model from the top down, along with their counterparts in the TCP/IP model.
3. Name the PDU at each layer of the OSI model.
4. What does “802” refer to in the IEEE 802 standard?
5. The Transport layer PDU includes a field for window size. What is the “window size”?
6. How does window size provide flow control?
7. What does the Data Link layer do with a frame after it receives it?
8. What is encoding, and where does it take place?
9. In regards to the OSI Reference Model, what is peer communication?
10. What are the sublayers of the Data Link layer, and what do they do?
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