The OSI Model - CTS 1134C

Which of the following tasks is associated with the Session layer? *Transmission synchronization *Host ID number assignment *Acknowledgement coordination *Connection establishment

Connection establishment.

Which of the following are included as part of Data Link layer specifications? (Select two.) *Synchronizing individual bits as they are transmitted through the network. *Composing electrical signals as they pass through the transmission medium. *Controlling how messages are propagated through the network. Identifying physical network devices. *Identifying physical network devices.

1. Controlling how messages are propagated through the network. 2. Identifying physical network devices.

Which of the following are functions of the MAC sublayer? (Select two.) *Mapping hardware addresses to link-layer addresses *Defining a unique hardware address for each device on the network *Creating routing tables based on MAC addresses *Letting devices on the network have access to the LAN

1. Defining a unique hardware address for each device on the network. 2. Letting devices on the network have access to the LAN.

In the OSI model, which of the following functions are performed at the Presentation layer? (Select two.) *Encrypt and compress data *Transmit data frames *Maintain separate client connections *Handle general network access, flow control, and error recovery *Provide network services *Specify data format (such as file formats)

1. Encrypt and compress data. 2. Specify data format (such as file formats).

In the OSI model, which of the following functions are performed at the Application layer? (Select all that apply.) *Integrating network functionality into the host operating system *Enabling communication between network clients and services *Data translation *Conversation identification

1. Integrating network functionality into the host operating system. 2. Enabling communication between network clients and services.

The Data Link Layer of the OSI model is comprised of two sublayers. What are they? (Select two.) *MAC *DLC *LAT *LLC *SAN

1. MAC; The Media Access Control (MAC) Sublayer, which translates generic network requests into device-specific terms. 2. LLC; The Logical Link Control (LLC) Sublayer, which provides the operating system link to the device driver.

What are the disadvantages of the OSI Model?

1. OSI layers are theoretical and do not actually perform real functions. 2. Industry Implementations rarely have a layer-to-layer correspondence with the OSI layers. 3. Different protocols are used within the OSI model to perform the different functions required to help send and receive the overall message. This can complicate the overall process. 4. A particular protocol implementation may not represent every OSI layer (or may spread across multiple layers).

What are the seven layers of the OSI Model?

1. Physical 2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application

What are the benefits of the OSI Model?

1. Provides a common language and reference point for network professionals. 2. Divides networking tasks into logical layers for easier comprehension. 3. Allows specialization of features at different layers. 4. Aids in troubleshooting. 5. Promotes standards of interoperability between networks and devices. 6. Provides modularity in networking features (developers can change features without changing the entire approach)

Which of the following functions are performed by the OSI Transport layer? (select three.) * Reliable message delivery * Control media access, logical topology, and device identification *Path identification and selection *End-to-end flow control *Consistent data formatting between dissimilar systems *Data segmentation and reassembly *Format packets for delivery through the media

1. Reliable message delivery 2. End-to-end flow control 3. Data segmentation and reassembly

Match the networking function or device on the left with its associated OSI model layer on the right. Session ID Number Application ASCII Presentation Port numbers Session Router Transport Modem Network HTTP Data Link Physical

Application - HTTP Presentation - ASCII Session - Session ID number Transport - Port numbers Network - Router Data Link - Switch Physical - Modem

What is the basic purpose of the OSI Physical layer? * Coordinates rules for managing network servers. * Coordinates rules for transmitting bits. * Defines basic physical structures, such as disks. * Coordinates rules for routing packets.

Coordinates rules for transmitting bits.

Which of the following functions are performed at the Physical layer of the OSI model? *Moving data across network cables *Data translation *Provisioning environments where you can run network applications *Enabling network services *Conversation identification

Moving data across network cables

What does OSI stand for in OSI model?

Open Systems Interconnection

Match each layer of the TCP/IP model on the left with the corresponding layer of the OSI model on the right. Each option on the left can be used more than once. Host Presentation Internet Data Link Network Access Application Application Session Network Transport

Presentation - Application Data Link - Network Access Application - Application Session - Application Network - Internet Transport - Host to Host

In the OSI model, what is the primary function of the Network layer? *Transmits data frames *Ensures that packets are delivered with no loss or duplication *Routes messages between networks *Allows applications to establish, use, and end a connection.

Routes messages between networks.

During TCP/IP communications between two network hosts, information is encapsulated on the sending host and decapsulated on the receiving host using the OSI model. Match the information format on the left with the appropriate layer of the OSI model on the right. (Not all layers have a matching information format.) Packets Segments Bits Frames

Session Layer Transport Layer - Segments Network Layer - Packets Data Link Layer - Frames Physical Layer - Bits

What is the OSI model?

The OSI Model is a theoretical way of classifying and talking about the complex process of sending data on a network.

Which OSI model layer is responsible for guaranteeing reliable message delivery? *Data Link *Session *Transport *Application

Transport.