Objective 1: TCP/IP and OSI Models

adjacent layer interaction

As data travels down the stack and goes from transport layer to the network layer, the packet PDU is created, then it its passed to the data link layer where the frame PDU encapsulates the data. These actions are called _______. a. Same layer interaction b. adjacent layer interaction

The first four layers are exactly the same. TCP/IP Application layer corresponds to OSI model top three layers.

How does the OSI model relate to the TCP/IP model?

It is the interface between the user and the computer running software.

In the OSI model, what is the primary function of the Application layer?

Provides the protocols for transmission across Local Area Networks (LANs) and error detection.

In the OSI model, what is the primary function of the Data Link layer?

It uses logical IP addresses to route packets across networks.

In the OSI model, what is the primary function of the Network layer?

Defines the physical characteristics of the transmission medium, including connectors, pins, use of pins, electrical currents, encoding, light modulation, etc.

In the OSI model, what is the primary function of the Physical layer?

It negotiates data formats, such as ASCII text, or image types like JPEG.

In the OSI model, what is the primary function of the Presentation layer?

This layer establishes, manages, and terminates connections between applications.

In the OSI model, what is the primary function of the Session layer?

This layer focuses of data delivery between two endpoints.

In the OSI model, what is the primary function of the Transport layer?

True

Protocol Data Units (PDU) enable two different network devices to coordinate the transfer of information between them. True or False

False

Same layer interaction is the interaction of the PDU as it travels down and up the stack

Open Systems Interconnection network model; Created so any computer can communicate with any other computer.

The International Organization for Standards created what? Why was it created?

7

The OSI model has how many layers? a. 4 b. 5 c. 6 d. 7

True

The OSI model is the only internationally accepted network model. True or False

Transport

This layer on the TCP/IP stack governs how application data will flow across the network using either User Datagram Protocol (UDP) or Transmission Control Protocol (TCP). a. Application b. Transport c. Network d. Data Link e. Physical

Network

This layer on the TCP/IP stack governs how user information is routed across various networks. a. Application b. Transport c. Network d. Data Link e. Physical

Application

This layer on the TCP/IP stack governs software operating on a computer. a. Application b. Transport c. Network d. Data Link e. Physical

Data Link

This layer on the TCP/IP stack governs the logical operations associated with the LAN media and performs error detection, not error correction. a. Application b. Transport c. Network d. Data Link e. Physical

Physical

This layer on the TCP/IP stack has no protocols, just energy to represent a bit of information. a. Application b. Transport c. Network d. Data Link e. Physical

Suite of rules; 5

Transmission Control Protocol/Internet Protocol (TCP/IP) is a ________ to govern packet switched networks and devices and is based on a __ layer stack.

TCP; UDP; TCP provides error recovery

What are two primary protocols used in layer 4 of the OSI and which one provides error recovery?

- Standardization - Ease of Troubleshooting - Allows vendor interoperability

What benefits does a layered model provide?

Routers are the only device that works in the network layer. Other devices that utilize information from a packet is the multilayer switch and any terminal device.

What equipment is used only on the Network layer? What other equipment utilizes information contained in a packet?

Terminal equipment such as computers and printers.

What equipment is used only one the Transport layer?

Data Link Layer (Layer 2)

Which layer on the OSI model also includes a link trailer as well as a link header?

DARPA working with different universities and other agencies saw the need to standardize the ability for various network/computers to connect to each other.

Why did DARPA create the TCP/IP model?