What Three Application Layer Protocols Are Part Of The TCP/IP Protocol Suite? (choose three.)

27 Mar 2025 Cisco
What Three Application Layer Protocols Are Part Of The TCP/IP Protocol Suite? (choose three.)

Understanding Three Key Application Layer Protocols in the TCP/IP Protocol Suite 

Introduction 

The TCP/IP protocol suite is the backbone of modern networking, enabling communication across the internet and private networks. It consists of multiple layers, with the Application Layer being the topmost layer responsible for providing network services directly to user applications. 

For those preparing for the CCNA 200-301 Dumps, understanding the Application Layer protocols is crucial. In this article, we will explore three essential Application Layer protocols—HTTP, DNS, and SMTP—and their roles in networking. Additionally, we will discuss how Dumpsarena’s CCNA 200-301 practice tests can help you master these concepts effectively. 

How Many Questions In CCNA Exam 200-301?

The CCNA 200-301 exam is a comprehensive certification test for networking fundamentals. Here are the key details regarding the number and types of questions:

Exam Structure:

- Total Questions: 90-110 (varies per exam) 

- Duration: 120 minutes (2 hours) 

- Question Types: 

  - Multiple-choice (single and multiple answers) 

  - Drag-and-drop 

  - Simulations (labs) 

  - Testlets (scenario-based questions) 

  - Fill-in-the-blank  

What Three Application Layer Protocols Are Part Of The TCP/IP Protocol Suite? (choose three.)

1. Hypertext Transfer Protocol (HTTP) 

 What is HTTP? 

HTTP (Hypertext Transfer Protocol) is an Application Layer protocol used for transmitting hypermedia documents, such as HTML files, across the web. It operates over TCP (Transmission Control Protocol) and is the foundation of data communication on the World Wide Web. 

How HTTP Works 

- Client-Server Model: A web browser (client) sends an HTTP request to a web server, which responds with the requested data. 

- Stateless Protocol: Each request is independent, meaning the server does not retain session information. 

- Port Used: HTTP typically uses port 80. 

HTTP vs. HTTPS 

- HTTP is unencrypted, making it vulnerable to attacks. 

- HTTPS (HTTP Secure) uses SSL/TLS encryption (port 443) to secure data transmission. 

 Importance in Networking 

- Essential for web browsing, APIs, and cloud services. 

- Critical knowledge of CCNA 200-301 as it forms the basis of web-based communications. 

2. Domain Name System (DNS) 

What is DNS? 

DNS (Domain Name System) is a distributed naming system that translates human-readable domain names (e.g., `www.example.com`) into machine-readable IP addresses (e.g., `192.0.2.1`). 

How DNS Works 

1. DNS Query: A user enters a domain name in a browser. 

2. Recursive Resolver: The request is sent to a DNS resolver (usually provided by the ISP). 

3. Root & TLD Servers: The resolver queries root and Top-Level Domain (TLD) servers. 

4. Authoritative Name Server: Finally, the correct IP is retrieved from the domain’s authoritative name server. 

5. Response: The IP is returned to the client, allowing the connection. 

Port Used 

- DNS primarily uses UDP port 53 for queries. 

- TCP port 53 is used for larger responses (e.g., zone transfers). 

Importance in Networking 

- Without DNS, users would have to memorize IP addresses. 

- A fundamental topic in CCNA 200-301 for understanding network name resolution. 

3. Simple Mail Transfer Protocol (SMTP) 

What is SMTP? 

SMTP (Simple Mail Transfer Protocol) is an email transmission protocol used for sending emails between servers. It works alongside other protocols like POP3 and IMAP (for receiving emails). 

How SMTP Works 

1. Sender’s Email Client: Composes an email and sends it via SMTP. 

2. SMTP Server: Processes the email and forwards it to the recipient’s mail server. 

3. Recipient’s Mail Server: Stores the email until retrieved by POP3/IMAP. 

Port Used 

- Port 25 (default for SMTP). 

- Port 587 (for secure SMTP with TLS encryption). 

Importance in Networking 

- Critical for email communication in enterprises. 

- Part of CCNA 200-301 syllabus under application protocols. 

Why do These Protocols Matter in CCNA 200-301?

The CCNA 200-301 exam tests your understanding of networking fundamentals, including Application Layer protocols. Knowing HTTP, DNS, and SMTP helps in: 

Troubleshooting web and email connectivity issues. 

Configuring network services. 

Understanding security implications (e.g., HTTPS vs. HTTP, DNS spoofing). 

How Dumpsarena Help You Ace CCNA 200-301?

Preparing for the CCNA 200-301 exam dumps requires hands-on practice and reliable study materials. [Dumpsarena] offers: 

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Detailed Explanations – Helps reinforce concepts like HTTP, DNS, and SMTP. 

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Conclusion 

Understanding HTTP, DNS, and SMTP is essential for networking professionals and CCNA 200-301 aspirants. These Application Layer protocols govern web browsing, domain resolution, and email communication. 

To ensure success in your CCNA 200-301 exam, leverage high-quality practice tests from [Dumpsarena]. Their expertly crafted resources will help you master TCP/IP protocols and other critical networking concepts. 

Start your journey to CCNA certification today with Dumpsarena!

CCNA 1 ITN (v5.0.3 + v6.0) Final Exam Answers 

1. Which layer of the TCP/IP model is responsible for logical addressing and routing? 

A) Application 

B) Transport 

C) Internet 

D) Network Access 

2. What is the default port number for HTTP? 

A) 25 

B) 80 

C) 443 

D) 53 

3. Which protocol operates at the Transport layer and provides connection-oriented communication? 

A) IP 

B) UDP 

C) TCP 

D) ICMP 

4. What is the purpose of ARP (Address Resolution Protocol)? 

A) To resolve domain names to IP addresses 

B) To resolve IP addresses to MAC addresses 

C) To route packets between networks 

D) To provide error reporting for IP 

5. Which of the following is a Class C private IP address range? 

A) 10.0.0.0 – 10.255.255.255 

B) 172.16.0.0 – 172.31.255.255 

C) 192.168.0.0 – 192.168.255.255 

D) 224.0.0.0 – 239.255.255.255 

6. Which protocol is used for dynamically assigning IP addresses to hosts on a network? 

A) DNS 

B) DHCP 

C) FTP 

D) SNMP 

7. What is the primary function of ICMP (Internet Control Message Protocol)? 

A) Encrypting data transmissions 

B) Error reporting and network diagnostics 

C) Resolving hostnames to IP addresses 

D) Establishing secure connections 

8. Which of the following is a characteristic of UDP? 

A) Guaranteed delivery 

B) Connection-oriented 

C) Low overhead and no flow control 

D) Three-way handshake 

9. What does the subnet mask 255.255.255.0 (/24) indicate? 

A) The first 24 bits are network bits 

B) The last 24 bits are host bits 

C) The first 8 bits are host bits 

D) The last 8 bits are network bits 

10. Which protocol is used to send email from a client to a mail server? 

A) POP3 

B) IMAP 

C) SMTP 

D) SNMP 

11. During a routine inspection, a technician discovered that software that was installed on a computer was secretly collecting data about websites that were visited by users of the computer. Which type of threat is affecting this computer?

A) DoS attack​

B) identity theft

C) spyware

D) zero-day attack

12. Which term refers to a network that provides secure access to the corporate offices by suppliers, customers, and collaborators?

A) Internet

B) intranet

C) extranet

D) extended net

13. A large corporation has modified its network to allow users to access network resources from their personal laptops and smartphones. Which networking trend does this describe?

A) cloud computing

B) online collaboration

C) bring your own device

D) video conferencing

14. What is an ISP?

A) It is a standards body that develops cabling and wiring standards for networking.

B) It is a protocol that establishes how computers within a local network communicate.

C) It is an organization that enables individuals and businesses to connect to the Internet.

D) It is a networking device that combines the functionality of several different networking devices in one.

15. An employee at a branch office is creating a quote for a customer. In order to do this, the employee needs to access confidential pricing information from internal servers at the Head Office. What type of network would the employee access?

A) an intranet

B) the Internet

C) an extranet

D) a local area network

These questions cover key TCP/IP concepts that are essential for the CCNA 200-301 exam. Let me know if you'd like explanations for any answers or additional practice questions! 

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