16 Communication; HTTP; TCP; UDP; RPC;

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Questions and Answers

What is the primary function of the Network layer in the OSI model?

To encrypt and decrypt data for secure transmission.

To route packets and map logical to physical addresses. (correct)

To establish and maintain a session between applications.

To control flow and segment messages for delivery.

Which layer of the OSI model is responsible for data compression and character code translation?

Session Layer

Transport Layer

Presentation Layer (correct)

Application Layer

Which of the following protocols is associated with the Transport layer of the OSI model?

TCP (correct)

SMTP

MAC

What type of addressing is used at the Data Link layer?

MAC addressing Signup and view all the answers

Which OSI layer is responsible for the physical transmission of raw data over a physical medium?

Physical Layer Signup and view all the answers

Which HTTP verb is used to delete a resource?

DELETE Signup and view all the answers

Which HTTP verb is considered safe and idempotent?

GET Signup and view all the answers

What is the primary role of HTTP in web communication?

To encode and transport data between client and server. Signup and view all the answers

Which of the following statements is true about the PUT method?

It creates or replaces a resource. Signup and view all the answers

Which HTTP request method is typically not safe?

PUT Signup and view all the answers

What is a primary characteristic of TCP in terms of data delivery?

Data is guaranteed to arrive in the original order and without corruption. Signup and view all the answers

Which protocol feature allows TCP to maintain smooth data flow?

Congestion control Signup and view all the answers

What should be preferred when the integrity of all data is critical?

TCP for reliable data transmission Signup and view all the answers

What happens when the sender of a TCP connection does not receive an acknowledgment for a packet?

The packet is resent until acknowledged or a timeout occurs. Signup and view all the answers

Which of the following scenarios best describes a disadvantage of using TCP?

High memory usage due to multiple open connections. Signup and view all the answers

What is a key reason for choosing UDP over TCP in real-time applications?

UDP has lower latency compared to TCP. Signup and view all the answers

Which of the following is NOT a characteristic of UDP?

It supports error correction. Signup and view all the answers

In which scenario would using UDP be more beneficial than using TCP?

When lost data is less of an issue than delays. Signup and view all the answers

What is one of the main drawbacks of UDP?

It lacks built-in congestion control. Signup and view all the answers

Which application would most likely use UDP for data transmission?

VoIP services. Signup and view all the answers

What does the client stub procedure do in an RPC?

Marshals procedure ID and arguments into a request message. Signup and view all the answers

What is a primary disadvantage of Remote Procedure Calls (RPC)?

Creating an API for each new operation or use case is required. Signup and view all the answers

When should one choose a native library (SDK) in RPC design?

When the target platform knowledge is guaranteed. Signup and view all the answers

Which component of an RPC setup handles the delivery of the request message from the client to the server?

Client communication module. Signup and view all the answers

What characterizes RPC calls in terms of performance and reliability?

RPC calls abstract the communication details, often leading to slower responses. Signup and view all the answers

Which of the following frameworks is considered a popular RPC framework?

Protobuf Signup and view all the answers

Which statement accurately reflects the primary focus of RPC?

To expose behaviors through performance-oriented internal communications. Signup and view all the answers

What is the role of the server stub procedure in the RPC process?

It processes and unpacks the request before calling the server procedure. Signup and view all the answers

Study Notes

OSI 7 Layer Model

Application Layer (7): Provides a window for users and applications to access the network. Examples include resource sharing, remote file access, and directory services.
Presentation Layer (6): Formats data for the application layer, acting as a translator. Functions include syntax layer encryption/decryption, character code translation, data conversion, and data compression.
Session Layer (5): Establishes, maintains, and terminates sessions between processes running on different stations. Features include session establishment, maintenance, termination, security, and name recognition.
Transport Layer (4): Guarantees reliable message delivery, ensuring accuracy, sequencing, and no loss. Duties include message segmentation, message acknowledgement, and message traffic control. Uses TCP or UDP.
Network Layer (3): Manages subnet operations, deciding the best path for data. Responsibilities include subnet traffic control, addressing, and subnetting. Uses IP addresses.
Data Link Layer (2): Enables error-free data transfer between nodes over the physical layer by providing frame sequencing, frame acknowledgement, and frame error checking. Includes MAC addresses.
Physical Layer (1): Handles the transmission and reception of raw bit streams over the physical medium. This includes data encoding, physical medium attachments (cables, hubs etc), and transmission techniques (baseband or broadband).