Objectives 1.1 1.2 1.8 Flashcards
Which layer of the OSI model converts data from the application layer into a format that can be sent over the network?
The presentation layer converts data from the application layer into a format that can be sent over the network. It also converts data from the session layer into a format the application layer can understand.
True or False: Transport protocols, such as UDP, map to the transport layer of the OSI model and are responsible for transporting data across the network.
True. The transport protocols map to the transport layer of the OSI model and are responsible for transporting data across the network. UDP is a transport protocol.
At what layer of the OSI model do FTP and TFTP map?
FTP and TFTP map to the application layer of the OSI model.
At which OSI layer does an AP operate? A. Network B. Physical C. Data Link D. Session
C. Data Link
A wireless access point operates at the data link layer of the OSI model.
Which of the following are sublayers of the data link layer? Choose two. A. MAC B. LCL C. Session D. LLC
A. MAC (Media Access Control)
D. LLC Logical Link Control
At which two OSI layers can a switch operate? Choose two. A. Layer 1 B. Layer 2 C. Layer 3 D. Layer 4
B. Layer 2 Data Link
C. Layer 3 Network
A switch uses the MAC addresses of connected devices to make its forwarding decisions.
Which of the following OSI layers is responsible for establishing connections between two devices? A. Network B. Transport C. Session D. Data Link
B. Transport
The transport layer is responsible for establishing a connection between networked devices. While the Session layer uses protocols to synchronize the data exchange between applications on separate devices.
What are the 7 layers of the OSI model in order 1-7?
Physical, Data Link, Network, Transport, Session, Presentation, Application
What is the primary function of the Network Layer?
Primary function is routing, providing mechanisms by which data can be passed from one network system to another.
What are protocols at the network layer responsible for?
Routing protocols provide functionality at the network layer which are software components. Protocols at the network layer are also responsible for route selection which is determining the best path for the data to take throughout the network. Packet describes the logical grouping of data at the network layer.
What are static and dynamic routing?
In static routing routes are manually added to the routing table. In dynamic routing routing protocols such as Routing Information Protocol (RIP) and Open Shortest Path First (OSPF) are used.
What is the function of the Physical layer?
It identifies the network’s physical characteristics including hardware, topology, and protocols. It defines the voltage used on a given medium and the frequency at which the signals that carry the operate which dictates speed and bandwidth of a given medium.
What is the basic function of the Transport Layer?
Provide mechanisms to transport data between network devices through error checking, service addressing, and segmentation.
What is error checking and service addressing and segmentation?
Error checking: protocols at the transport layer ensure that data is correctly sent or received.
Service addressing: a number of protocols support many network devices. Transport layer ensures that data is passed to the right service of the upper layers of the OSI model.
Segmentation: Process of breaking packets into manageable sizes for the lower layers to handle.
Explain the two common methods of flow control in the transport layer.
Transport layer controls the data flow which is how the receiving device can accept data transmissions. Two common methods of flow control are Buffering and Windowing.
Buffering: data is temporarily stored and waits for the destination device to become available.
Windowing: In a windowing environment data is sent in groups of segments that require only one acknowledgement.
What are the primary functions of the data link layer?
Responsible for getting data to the physical layer so that it can transmit over the network and error detection, error correction, and hardware addressing.
What are the two sublayers of Layer 2 and what do they do?
Media access control (MAC): The MAC address is defined at this and also controls access to network media. Logical Link Control (LLC): Responsible for the error and flow control mechanisms of the data link layer.
What are the primary functions of Layer 5?
Responsible for managing and controlling the synchronization of data between applications on two devices. It does this by establishing, maintaining, and breaking sessions.
What are the primary functions of the Presentation Layer?
Layer 6 basic function is to convert the data intended for or received from the application layer into another format. Conversion is required because of how data is formatted so that it can be transported across the network.
What are the primary functions of layer 7?
The application layer’s primary function is to take requests and data from the users and pass them to the lower layers of the OSI model. Incoming information is passed to layer 7 which is then displayed to the user. This layer also defines the processes that enable applications to use network services.
