Application Layer Protocols: HTTP, FTP, SMTP, DNS, Web Services, and APIs

Question 1

Which feature is unique to the HTTP protocol?

Accepted Answer

Stateless

Answer

Request-response

Answer

Secure

Answer

Bidirectional

Question 2

What is the primary function of the DNS protocol?

Accepted Answer

To translate domain names into IP addresses

Answer

To transfer files across a network

Answer

To transmit email messages

Answer

To establish secure connections

Question 3

Which of the following protocols is commonly used for file transfer?

Accepted Answer

FTP

Answer

SMTP

Answer

HTTP

Answer

DNS

Question 4

What is the main purpose of a web service?

Accepted Answer

To provide standardized access to resources and functionality through an interface

Answer

To transmit email messages

Answer

To transfer files across a network

Answer

To establish secure connections

Question 5

Which header field in HTTP specifies the type of content in the response?

Accepted Answer

Content-Type

Answer

Accept

Answer

Location

Answer

Referer

Question 6

What is the most common HTTP status code for a successful request?

Accepted Answer

200

Answer

404

Answer

500

Answer

301

Question 7

What is the primary role of an API?

Accepted Answer

To provide a programmatic interface for interacting with a software system

Answer

To transfer files across a network

Answer

To transmit email messages

Answer

To establish secure connections

Question 8

What is the main purpose of a MIME type?

Accepted Answer

To specify the format and encoding of a message body in an email or web request

Answer

To translate domain names into IP addresses

Answer

To transfer files across a network

Answer

To establish secure connections

Question 9

To retrieve data from a web server, which HTTP method should you use?

Accepted Answer

GET

Answer

POST

Answer

PUT

Answer

DELETE

Question 10

Which DNS record type is used to link a domain name (e.g., example.com) to an IP address (e.g., 192.0.2.1)?

Accepted Answer

A

Answer

MX

Answer

CNAME

Answer

PTR

Question 11

What is the default port number associated with the File Transfer Protocol (FTP)?

Accepted Answer

21

Answer

20

Answer

22

Answer

23

Question 12

Which of the following accurately describes the role of the Simple Mail Transfer Protocol (SMTP) in the email delivery process?

Accepted Answer

Composing and sending emails

Answer

Storing and managing emails

Answer

Forwarding emails to recipients

Answer

Decrypting and encrypting emails

Question 13

What is the primary purpose of an Application Programming Interface (API)?

Accepted Answer

To facilitate communication between different software applications

Answer

To provide a graphical user interface for users

Answer

To store and manage data

Answer

To protect networks from cyber threats

Question 14

Which of the following is a common security concern associated with the Domain Name System (DNS)?

Accepted Answer

DNS spoofing

Answer

Phishing attacks

Answer

Malware infection

Answer

DDoS attacks

Question 15

What is the key distinction between the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP)?

Accepted Answer

TCP is connection-oriented, while UDP is connectionless

Answer

TCP provides higher bandwidth, while UDP offers lower latency

Answer

TCP is used for file transfer, while UDP is used for real-time applications

Answer

TCP is more secure than UDP

Question 16

Which of the following network applications commonly utilizes the UDP protocol?

Accepted Answer

Video streaming

Answer

Web browsing

Answer

Email pengiriman

Answer

File sharing

Question 17

What is the primary purpose of a firewall in a network?

Accepted Answer

To prevent unauthorized access to the network

Answer

To detect and block malware

Answer

To improve network performance

Answer

To provide VPN access to remote users

Question 18

Which web service architecture is known for its simplicity, uses a resource-based approach, and relies on HTTP?

Accepted Answer

REST

Answer

SOAP

Answer

RPC

Answer

CORBA

Question 19

Which protocol operates primarily on port 80 and is essential for web browsing?

Accepted Answer

HTTP

Answer

FTP

Answer

SMTP

Answer

DNS

Question 20

Identify the protocol specifically employed for transferring files over a network?

Accepted Answer

FTP

Answer

HTTP

Answer

SMTP

Answer

DNS

Question 21

Which protocol is responsible for facilitating email transmission?

Accepted Answer

SMTP

Answer

HTTP

Answer

FTP

Answer

DNS

Question 22

Identify the protocol primarily utilized for translating domain names into corresponding IP addresses.

Accepted Answer

DNS

Answer

HTTP

Answer

FTP

Answer

SMTP

Question 23

Which protocol operates on port 25 and is specifically designed for email transmission?

Accepted Answer

SMTP

Answer

HTTP

Answer

FTP

Answer

DNS

Question 24

Which of the following is not a responsibility of the Application Layer in networking?

Accepted Answer

Network addressing

Answer

Error detection and correction

Answer

Process-to-process communication

Answer

Flow control

Question 25

In the Application Layer, which protocol is primarily used for web browsing?

Accepted Answer

HTTP

Answer

FTP

Answer

SMTP

Answer

DNS

Question 26

Which protocol is specifically designed for the purpose of transferring files across a network?

Accepted Answer

FTP

Answer

HTTP

Answer

SMTP

Answer

DNS

Question 27

What is the primary function of SMTP?

Accepted Answer

Sending and receiving electronic mail (email)

Answer

Retrieving email messages

Answer

Resolving domain names

Answer

Establishing network connections

Question 28

What is the purpose of a web service?

Accepted Answer

To provide access to data and functionality over the internet

Answer

To manage network resources and connectivity

Answer

To secure data transmissions

Answer

To facilitate file sharing

Question 29

Which of the following is NOT a characteristic of an API?

Accepted Answer

Dependency on a specific programming language

Answer

Well-defined interface

Answer

Encapsulation of functionality

Answer

Reusable and extensible

Question 30

What is the REST architectural style commonly used for web services?

Accepted Answer

Representational State Transfer

Answer

Remote Evaluation of Server-Side Transactions

Answer

Resource-Oriented Style Transfer

Answer

Remote Entity State Transfer

Question 31

Which HTTP method is used to create new resources?

Accepted Answer

POST

Answer

GET

Answer

PUT

Answer

PATCH

Question 32

Which of the following is NOT a primary Application Layer protocol?

Accepted Answer

UDP

Answer

HTTP

Answer

FTP

Answer

SMTP

Question 33

What is the primary purpose of the Domain Name System (DNS)?

Accepted Answer

To translate domain names into IP addresses

Answer

To provide email services

Answer

To establish secure connections

Answer

To transfer files over a network

Question 34

Which of the following best describes the purpose of web services?

Accepted Answer

Providing access to data and functionality over the Internet

Answer

Managing user authentication and authorization

Answer

Routing network traffic

Answer

Storing and retrieving files

Question 35

Which of the following is a potential security threat at the Application Layer?

Accepted Answer

Phishing attacks

Answer

ARP poisoning

Answer

MAC spoofing

Answer

TCP hijacking

Question 36

What is the main function of a firewall in a network security context?

Accepted Answer

To prevent unauthorized access to and from a network

Answer

To translate network protocols

Answer

To encrypt data transmissions

Answer

To provide backup in case of network failure

Question 37

In the Domain Name System (DNS), which record type designates the mail server that handles email for a specific domain name?

Accepted Answer

MX

Answer

A

Answer

CNAME

Answer

NS

Question 38

Which protocol is specifically designed for secure file transfer and employs public-key cryptography for enhanced security?

Accepted Answer

SFTP

Answer

HTTP

Answer

FTP

Answer

SMTP

Question 39

Which web service architecture emphasizes XML and a contract-first approach?

Accepted Answer

SOAP

Answer

REST

Question 40

Which protocol is specifically designed for transferring files across a network?

Accepted Answer

FTP

Answer

HTTP

Answer

SMTP

Question 41

Which of the following protocols is used to transfer files between a client and a server?

Accepted Answer

FTP

Answer

HTTP

Answer

DNS

Question 42

Which protocol is responsible for resolving domain names to IP addresses?

Accepted Answer

DNS

Answer

FTP

Answer

SMTP

Answer

HTTP

Question 43

Which of the following is the primary protocol used for sending email?

Accepted Answer

SMTP

Answer

FTP

Answer

DNS

Answer

HTTP

Question 44

Which protocol is used for exchanging data between distributed systems and applications?

Accepted Answer

Web services

Answer

FTP

Answer

HTTP

Question 45

What is the purpose of an API?

Accepted Answer

To define a standardized interface for accessing and interacting with data and services

Answer

To store data

Answer

To send email

Question 46

Which of the following is NOT a characteristic of RESTful APIs?

Accepted Answer

Statefulness

Answer

Uniform interface

Answer

Cacheability

Answer

Statelessness

Question 47

What is the primary role of a web server in the Application Layer?

Accepted Answer

To host and deliver web pages and resources to clients

Answer

To resolve domain names

Answer

To send email

Question 48

What is the purpose of a cookie in web applications?

Accepted Answer

To store user-specific information and preferences on the client side

Answer

To resolve domain names

Answer

To send data to a server

Question 49

Which of the following is a key feature of the Application Layer?

Accepted Answer

Provides application-specific functionality and communication protocols

Answer

Handles routing and switching of data packets

Answer

Ensures reliable data transmission

Question 50

Which protocol is primarily used to transfer files between computers over a network?

Accepted Answer

FTP (File Transfer Protocol)

Answer

DNS (Domain Name System)

Answer

HTTP (Hypertext Transfer Protocol)

Answer

SMTP (Simple Mail Transfer Protocol)

Question 51

Which protocol is responsible for translating human-readable domain names into numerical IP addresses?

Accepted Answer

DNS (Domain Name System)

Answer

HTTP (Hypertext Transfer Protocol)

Answer

FTP (File Transfer Protocol)

Answer

SMTP (Simple Mail Transfer Protocol)

Question 52

Which protocol is commonly used to deliver web pages and other resources to web browsers?

Accepted Answer

HTTP (Hypertext Transfer Protocol)

Answer

DNS (Domain Name System)

Answer

SMTP (Simple Mail Transfer Protocol)

Answer

FTP (File Transfer Protocol)

Question 53

Which protocol is primarily used for sending and receiving email messages?

Accepted Answer

SMTP (Simple Mail Transfer Protocol)

Answer

FTP (File Transfer Protocol)

Answer

HTTP (Hypertext Transfer Protocol)

Answer

DNS (Domain Name System)

Question 54

What is the primary purpose of a web service?

Accepted Answer

To provide a standardized way for applications to interact and exchange data over a network.

Answer

To render web pages in a web browser.

Answer

To store data in a database.

Question 55

What is an API (Application Programming Interface) in the context of web services?

Accepted Answer

A set of rules and specifications that allow different software applications to communicate and exchange data with each other.

Answer

A specific programming language used for web development.

Answer

A type of web server software.

Question 56

In the TCP/IP model, which layer is primarily responsible for ensuring reliable data transmission between applications?

Accepted Answer

Transport Layer

Answer

Data Link Layer

Answer

Network Layer

Answer

Application Layer

Question 57

What is the default port number used by HTTP (Hypertext Transfer Protocol)?

Accepted Answer

80

Answer

53

Answer

25

Answer

21

Question 58

In the context of HTTP, which method is used to request data from a web server?

Accepted Answer

GET

Answer

PUT

Answer

POST

Answer

DELETE

Question 59

Which HTTP status code indicates that a request has been successfully completed and the requested resource has been delivered?

Accepted Answer

200 OK

Answer

301 Moved Permanently

Answer

500 Internal Server Error

Answer

404 Not Found