CTC 228 Chapter 6

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?

6

Which is the IEEE standard that sets the standards for wireless networking?

802.11

What is the IEEE standard that governs all forms of Ethernet media?

802.3

At what layer do NICs operate?

Data Link

Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control sublayer?

Data Link

The Network layer communicates with the Data Link layer and the Session layer.

False

The Physical layer has been divided into two sublayers, called the LLC sublayer and the MAC sublayer.

False

The PDU at the Data Link layer is called a ____________.

Frame

The ____________ reference model is a general framework for networking systems that uses a layered approach to reduce its complexity.

OSI

At which layer would you find errors that were caused by EMI?

Physical

The ____________ layer is the bottom layer, whose job it is to convert bits into signals and vice versa.

Physical

Which layer of the OSI model is responsible for encryption and decryption?

Presentation

How can you find out what your MAC address is? (Choose all that apply.)

Right-click on the Local Area Connection and choose status. Open a command prompt and type the command Open a command prompt and type the command

What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device?

Sequence number

Which layer is responsible for establishing a connection between the source and destination?

Session

One of the problems that can occur in the Network layer is the incorrect configuration of a hosts IP address.

True

The Transport layer is the same in both the OSI model and the TCP/IP model.

True

The maximum transmission unit for Ethernet is 1518 bytes.

True

What information would you find in the header of a Transport layer PDU?

Window size

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

f., a., g., e., b., d., c.

Which layer is responsible for the encoding of signals?

1

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?

Access control

The ____________ layer of the TCP/IP model combines the top three layers of the OSI model into one layer.

Application

The process of stripping the header and trailer from a PDU is called ____________.

Deencapsulation

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?

Encapsulation

Which of the following are protocols that you find at the Application layer of the OSI model?

FTP DHCP SNMP

What is a PDU?

It is the name given to the unit of information used by each layer.

The Transport layer segments data into smaller chunks, the size of which is determined by which of the following?

MTU

Which layer is responsible for determining the best path a packet should travel across an internetwork?

Network

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?

Network layer device