CS6250 Computer Networks Exam 3 Actual Exam Newest Questions And Correct Detailed Answers

CS6250 Computer Networks Exam 2 Actual Exam Newest Complete Questions
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OSI Model

Conceptual model that standardizes communications between computers

OSI 7 Layer Model

7. Application

6. Presentation

5. Session

4. Transport

3. Network

2. Data Link

1. Physical

OSI 5 Layer Model

5. Application

4. Transport

3. Network

2. Data Link


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, 1. Physical

OSI Model Advantages

- Scalability

- Modularity

- Flexibility

OSI Model Disadvantages

- Some layers depend on information from other layers, which can violate goal of
layer separation

- One layer may duplicate lower layer functionalities

- Additional overhead caused by abstraction between layers

Interface between the application layer & transport layer

Sockets

Application Layer Protocols

HTTP, SMTP, FTP, DNS, etc.

What does the application layer do?

It is the layer which interacts with the user to provide access to services and data
that is sent/received over a network.

What does the application layer call a packet of data?

Message

Application layer service/interface/protocol
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