Application Layer Protocols MCQ Quiz - Objective Question with Answer for Application Layer Protocols - Download Free PDF

Last updated on Jul 15, 2025

Application Layer MCQs are crucial for assessing one's understanding of this topmost layer of the OSI (Open Systems Interconnection) model. The application layer facilitates communication between networked applications and supports various protocols and services. Application Layer MCQs evaluate learners' knowledge of application layer protocols, client-server architecture, application layer security, and web technologies. By answering Application Layer MCQs, individuals can enhance their comprehension of application layer functionality, understand the role of protocols like HTTP, SMTP, and FTP, and their significance in network communication and web development.

Latest Application Layer Protocols MCQ Objective Questions

Application Layer Protocols Question 1:

Microsoft Azure is a ________ computing service.

  1. Distributed
  2. Systolic array
  3. High performance
  4. Cloud
  5. None of the above

Answer (Detailed Solution Below)

Option 4 : Cloud

Application Layer Protocols Question 1 Detailed Solution

Microsoft Azure is a cloud computing service created by Microsoft for building, deploying, and managing applications and services through a global network of Microsoft-managed data centers.

Application Layer Protocols Question 2:

Which of the following protocols uses both TCP and UDP?

1) FTP

2) SMTP

3) Telnet

4) DNS

  1. 1
  2. 3
  3. 4
  4. 2
  5. None of the above

Answer (Detailed Solution Below)

Option 3 : 4

Application Layer Protocols Question 2 Detailed Solution

Explanation:

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

1. The Domain Name System (DNS) is the phonebook of the Internet. Humans access information online through domain names, like nytimes.com or espn.com. Web browsers interact through Internet Protocol (IP) addresses. DNS translates domain names to IP addresses so browsers can load Internet resources.

2. Each device connected to the Internet has a unique IP address that other machines use to find the device. DNS servers eliminate the need for humans to memorize IP addresses such as 192.168.1.1 (in IPv4), or more complex newer alphanumeric IP addresses such as 2400:cb00:2048:1::c629:d7a2 (in IPv6).

Working of DNS:

  • When a user types a human-readable address into the browser, the operating system’s DNS client will check for information in a local cache. If the requested address isn’t there, it will look for a Domain Name System server in the local area network (LAN). When the local DNS server receives the query, and the requested domain name is found, it will return the result.
  • If the name is not found, the local server will forward the query to a DNS cache server, often provided by the Internet Service Provider (ISP). Since the DNS server’s cache contains a temporary store of DNS records, it will quickly respond to requests. These DNS cache servers are called not authoritative DNS servers as they provide request resolution based in a cached value acquired from authoritative DNS servers.

Confusion Points

Some Standard books say that DNS uses UDP only, But in implementation DNS also using TCP as well.

Application Layer Protocols Question 3:

MIME stands for 

  1. Multipurpose Exchange Mail Exchange
  2. Multiple Information Main Exchange
  3. Multipurpose Internet Mail Extensions
  4. Multipurpose Information. Main Extensions

Answer (Detailed Solution Below)

Option 3 : Multipurpose Internet Mail Extensions

Application Layer Protocols Question 3 Detailed Solution

The correct answer is Multipurpose Internet Mail Extensions

Key Points

  • MIME: ✅ MIME stands for Multipurpose Internet Mail Extensions. It is an internet standard that extends the format of email messages to support text in character sets other than ASCII, non-text attachments, message bodies with multiple parts, and header information in non-ASCII character sets.
  • Multipurpose Exchange Mail Exchange: ❌ This is not correct as it does not reflect the true meaning of MIME.
  • Multiple Information Main Exchange: ❌ This option is incorrect and does not relate to the actual definition of MIME.
  • Multipurpose Information Main Extensions: ❌ This is an incorrect interpretation of MIME and does not align with its function.

Additional Information

  • MIME is widely used in email communication to include multimedia content such as images, audio, video, and other file attachments.
  • It is also used in web technology to specify content types (e.g., `text/html`, `image/jpeg`) for handling data properly in browsers.
  • MIME was first defined in June 1992 by the Internet Engineering Task Force (IETF).

Application Layer Protocols Question 4:

Which of the following protocols may be used for accessing World Wide Web?

  1. HTTP
  2. SMTP
  3. SLIP
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : HTTP

Application Layer Protocols Question 4 Detailed Solution

The correct answer is HTTP

Key Points

  • HTTP (HyperText Transfer Protocol): ✅ HTTP is a protocol used to access and transfer data over the World Wide Web. It is the foundation of data communication on the internet, allowing users to load web pages and interact with websites.
  • SMTP (Simple Mail Transfer Protocol): ❌ SMTP is used for sending emails, not for accessing web content.
  • SLIP (Serial Line Internet Protocol): ❌ SLIP is an obsolete protocol used for point-to-point communication over serial connections, not for accessing the World Wide Web.
  • None of the above: ❌ This option is incorrect because HTTP is indeed used for accessing the World Wide Web.

Additional Information

  • HTTP works alongside other protocols like HTTPS (HyperText Transfer Protocol Secure), which adds encryption for secure communication.
  • Web browsers, such as Chrome, Firefox, and Safari, use HTTP/HTTPS to request and display content from web servers.
  • HTTP is a stateless protocol, meaning each request is independent of the previous one, which helps in simplicity but requires additional mechanisms (like cookies) for maintaining sessions.

Application Layer Protocols Question 5:

Which of the following specifies how the communication will happen between web server and web browser?

  1. HTML
  2. HTTP
  3. Uniform Resource Locator
  4. XML

Answer (Detailed Solution Below)

Option 2 : HTTP

Application Layer Protocols Question 5 Detailed Solution

The correct answer is Option 2) HTTP.

Key Points

  • HTTP (HyperText Transfer Protocol) is the protocol that governs how data is transmitted between a web browser (client) and a web server.
  • It defines:
    • How requests (like GET, POST) are made by the browser to the server
    • How the server responds with status codes (200 OK, 404 Not Found, etc.) and content (HTML, CSS, JS, JSON)
    • The structure and format of the request and response messages
  • HTTP is a stateless, application-layer protocol built on top of TCP/IP.
  • Modern web traffic often uses HTTPS, which is HTTP over an encrypted TLS/SSL connection.

Additional Information

  • Option 1 – HTML: A markup language used to structure content on web pages, not for communication protocols.
  • Option 3 – URL (Uniform Resource Locator): Specifies the address of a resource on the internet, not the communication mechanism.
  • Option 4 – XML: A markup language for storing and transporting data; it does not define how communication occurs.
  • Common HTTP Methods:
    • GET – Retrieve data
    • POST – Submit data to the server
    • PUT – Update a resource
    • DELETE – Remove a resource

Top Application Layer Protocols MCQ Objective Questions

Which among the following protocols is known as the terminal emulation protocol?

  1. HTTP
  2. FTP
  3. SMTP
  4. TELNET

Answer (Detailed Solution Below)

Option 4 : TELNET

Application Layer Protocols Question 6 Detailed Solution

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  • TELNET is the terminal emulation protocol in a TCP/IP environment for the remote access of a terminal (client) to a server.
  • TELNET uses the TCP as the transport protocol to establish a connection between server and client.

Which one of the following protocols is used for E-mail services?

  1. HTTP
  2. IP
  3. SMTP
  4. PPP

Answer (Detailed Solution Below)

Option 3 : SMTP

Application Layer Protocols Question 7 Detailed Solution

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The correct answer is SMTP.

Key Points 

  • SMTP:- The Simple Mail Transfer Protocol (SMTP) is used for the transfer of mail messages and attachments.
  • IP:- The Internet Protocol (IP) is a routable protocol responsible for IP addressing and the fragmentation and reassembly of packets.
  • UDP:- UDP provides a one-to-one or one-to-many, connectionless, unreliable communications service. UDP is used when the amount of data to be transferred is small.

What is the full form of FTP?

  1. File transfer protocol
  2. File transmission protocol
  3. File trimming protocol
  4. All of the above

Answer (Detailed Solution Below)

Option 1 : File transfer protocol

Application Layer Protocols Question 8 Detailed Solution

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File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network.

FTP is built on a client-server model architecture using separate control and data connections between the client and the server.

Port numbers 21 and 20 are used for FTP. Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel).

Port 20- Data

Port 21- Host

File transfer is among the most frequently used TCP/IP applications and it accounts for a lot of the network traffic on the Internet.

Various standard file transfer protocols existed even before the Internet was available to everyone and it was these early versions of the file transfer software that helped create today's standard known as the File Transfer Protocol (FTP).

The set of rules that facilitate communication between nodes in a network is called:

  1. Web service
  2. Hypertext
  3. Ordinance
  4. Protocol

Answer (Detailed Solution Below)

Option 4 : Protocol

Application Layer Protocols Question 9 Detailed Solution

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The correct answer is Protocol.

Key Points

  • The set of rules that facilitate communication between nodes in a network is called Protocol
  • A network protocol is an established set of rules that determine how data is transmitted between different devices in the same network.
    • It dictates how to format, transmit and receive data so that computer network devices -- from servers and routers to endpoints -- can communicate.
    • Network protocols break larger processes into discrete, narrowly defined functions and tasks across every level of the network.
    • In the standard model, known as the Open Systems Interconnection (OSI) model, one or more network protocols govern activities at each layer in the telecommunication exchange.
    • Lower layers deal with data transport, while the upper layers in the OSI model deal with software and applications.
  • Classification of network protocols
    • DHCP: Dynamic Host Configuration Protocol
    • DNS: Domain Name System Protocol
    • FTP: File Transfer Protocol
    • HTTP: Hyper Text Transfer Protocol
    • IMAP and IMAP4: Internet Message Access Protocol (version 4)
    • POP and POP3: Post Office Protocol (version 3)
    • SMTP: Simple Mail Transfer Protocol
    • Telnet: Terminal emulation protocol
    • SNMP: Simple Network Management Protocol
    • LPP: Lightweight Presentation Protocol
    • RPC: Remote Procedure Call protocol
    • TCP: Transmission Control Protocol
    • UDP: User Datagram Protocol
    • IP: Internet Protocol (IPv4)
    • IPv6: Internet Protocol version 6
    • ICMP: Internet Control Message Protocol
    • ARP: Address Resolution Protocol
    • SLIP: Serial Line IP

Which of the following is not e-mail protocol?

  1. POP
  2. IMAP
  3. SMTP
  4. FTP

Answer (Detailed Solution Below)

Option 4 : FTP

Application Layer Protocols Question 10 Detailed Solution

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SMTP stands for Simple Mail Transfer Protocol. SMTP is used when email is delivered from an email client, such as Outlook Express, to an email server or when email is delivered from one email server to another. SMTP uses port 25.

POP3 stands for Post Office Protocol. POP3 allows an email client to download an email from an email server. POP3 normally uses port 110.

IMAP stands for Internet Message Access Protocol. It is a protocol that an email client can use to download email from an email server. IMAP requires more disk space on the server and more CPU resources than POP3, as all emails are stored on the server. IMAP normally uses port 143.

FTP

stands for File Transfer Protocol which used for the transfer of computer files between a client and server on a computer network. Hence, it is not an email protocol.

Consider different activities related to email.

m1: Send an email from a mail client to a mail server

m2: Download an email from mailbox server to a mail client

m3: Checking email in a web browser

Which is the application level protocol used in each activity?

  1. m1 : HTTP m2 : SMTP m3 : POP
  2. m1 : SMTP m2 : FTP m3 : HTTP 
  3. m1 : SMTP  m2 : POP m3 : HTTP
  4. m1 : POP m2 : SMTP m3 : IMAP

Answer (Detailed Solution Below)

Option 3 : m1 : SMTP  m2 : POP m3 : HTTP

Application Layer Protocols Question 11 Detailed Solution

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The correct answer is option 3

SMTP:

  • SMTP stands for Simple Mail Transfer Protocol and it is an application layer protocol.
  • SMTP is used to send an email from a mail client to a mail server.
  • SMTP uses port 25.

POP:

  • POP stands for Post Office Protocol and it is also an application layer protocol.
  • POP allows an email client to download an email from an email server.

HTTP:

The Hypertext Transfer Protocol (HTTP) is an Application Layer protocol and is used to check email in a web browser.

So, m1 : SMTP  m2 : POP m3 : HTTP

Match the following protocols with their descriptions.

1. HTTP A. Used to log in over a TCP/IP connection
2. FTP  B. This Protocol is used in the file transfer on the Internet and within private networks
3. Telnet C. It is the application protocol used for distributed and collaborative hypermedia information system

 

  1. 1 - C, 2 - B, 3 - A 
  2. 1 - A, 2 - B, 3 - C
  3. 1 - A, 2 - C, 3 - B
  4. 1 - B, 2 - A, 3 - C 

Answer (Detailed Solution Below)

Option 1 : 1 - C, 2 - B, 3 - A 

Application Layer Protocols Question 12 Detailed Solution

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The correct answer is 1 - C, 2 - B, 3 - A.

Key Points 

  • The Hypertext Transfer Protocol (HTTP) is an application layer protocol for distributed, collaborative, hypermedia information systems.
  • The File Transfer Protocol (FTP) is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network.
  • Telnet is an application protocol used on the Internet or local area network to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.

Additional Information

  • INTERNET stands for Interconnected Network that is a network system that connects millions of web servers.
  • GOOGLE stands for Global Organization of Oriented Group Language of Earth. 
  • USB stands for Universal Serial Bus.
  • CCTV stands for closed-circuit television.

Which of the following is a client-server protocol for transmitting files between computers on the Internet over TCP/IP connections?

  1. HTTPS
  2. HTTP
  3. FTP
  4. SMTP

Answer (Detailed Solution Below)

Option 3 : FTP

Application Layer Protocols Question 13 Detailed Solution

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  • FTP is a client-server protocol for transmitting files between computers on the Internet over TCP/IP connections.
  • FTP  stands for File Transfer Protocol
  • Using FTP, a client can upload, download, delete, rename, move and copy files on a server.

In one of the pairs of protocols given below, both the protocols can use multiple TCP connections between the same client and the server. Which one is that? 

  1. HTTP, FTP
  2. HTTP, TELNET
  3. FTP, SMTP
  4. HTTP, SMTP

Answer (Detailed Solution Below)

Option 1 : HTTP, FTP

Application Layer Protocols Question 14 Detailed Solution

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HTTP: Multiple TCP connections can be used at client and server end.

FTP: For FTP also multiple connections can be used at the same time.

TELENT: Only one TCP connection is allowed at a time.

SMTP: SMTP also allows only one TCP connection at a time.

Which of the following protocol(s) may be used for Email communication?

(i) UDP

(ii) SMTP

(iii) POP 

(iv) IMAP

  1. (i), (ii) and (iii)
  2. (ii), (iii) and (iv)
  3. (i), (ii) and (iv)
  4. (i), (iii) and (iv)

Answer (Detailed Solution Below)

Option 2 : (ii), (iii) and (iv)

Application Layer Protocols Question 15 Detailed Solution

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The correct answer is Option 2.

Concept:

The most commonly used Email protocols on the internet – POP3, IMAP, and SMTP. 

  • Post Office Protocol 3 is the most commonly used protocol for receiving email over the internet. This standard protocol, which most email servers and their clients support, is used to receive emails from a remote server and send them to a local client.
  • Internet Message Access Protocol is a protocol for accessing email or bulletin board messages from a mail server or service. IMAP allows a client e-mail program to access remote message stores as if they were local.
  • The Simple Mail Transfer Protocol is the industry standard for sending emails over the Internet.

The correct answer is (ii), (iii), and (iv).

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