Computer networking MCQ – Change your future

731. Third generation of cellular telephony refers to a combination of technologies that provides

Correct Answer: Correct answer is: (A) Services.

Exam Relevance: GATE, GRE, GMAT, Professional Certification Exams

Difficulty: Easy

Concept notes: Third generation (3G) cellular telephony refers to a combination of technologies that provide advanced services beyond voice and text messaging.

Common Mistakes: Students may confuse 3G with just a set of techniques or efficiency improvements, overlooking the broader range of services it offers.

Explanations: Third generation cellular telephony, or 3G, is characterized by its ability to provide a wide range of services, including high-speed internet access, video calls, and multimedia messaging. While it does involve new techniques and efficiency improvements, the primary focus is on the enhanced services it offers to users.

Option Analysis:

Option A: Correct. 3G is primarily known for providing advanced services.
Option B: Incorrect. While techniques are involved, they are not the primary focus.
Option C: Incorrect. Efficiency is an aspect but not the main focus.
Option D: Incorrect. The combination of all options is not the correct answer.

732. ..... was designed as an alternative to the T-1 line.

Correct Answer: Correct answer is: (D) HDSL.

Exam Relevance: Networking exams, Telecommunications exams, Data Communication exams

Difficulty: Moderate

Concept notes: HDSL (High-bit-rate Digital Subscriber Line) was designed as an alternative to the T-1 line for providing high-speed digital transmission over regular telephone lines.

Common Mistakes: Students may confuse HDSL with other DSL technologies like ADSL or VDSL, which are designed for different purposes and environments.

Explanations: HDSL was specifically developed to provide a digital transmission service that could replace T-1 lines, which traditionally used copper wires to transmit data at 1.544 Mbps. HDSL offers similar transmission rates over standard telephone lines, making it a viable alternative for businesses and organizations that require high-speed data transmission without the need for T-1 infrastructure.

Option Analysis:

Option A: VDSL (Very High-bit-rate Digital Subscriber Line) is designed for very high-speed data transmission over short distances, not as a direct T-1 line alternative.
Option B: ADSL (Asymmetric Digital Subscriber Line) is designed for asymmetric data transmission, typically used for internet access, not as a T-1 line alternative.
Option C: SDSL (Symmetric Digital Subscriber Line) provides symmetric data transmission rates but is not specifically designed as a T-1 line alternative.
Option D: HDSL (High-bit-rate Digital Subscriber Line) was specifically designed to provide high-speed digital transmission over regular telephone lines as an alternative to T-1 lines.

Mnemonic: HDSL: High-speed Digital, T-1 Line Substitute

733. A point-to-point protocol over ethernet is a network protocol for

Correct Answer: Correct answer is: (A) Encapsulating PPP frames inside ethernet frames.

Exam Relevance: CCNA, CompTIA Network+, CISSP

Difficulty: Easy

Concept notes: Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol that encapsulates PPP frames within Ethernet frames. This allows PPP to be used over Ethernet networks, which is useful for connecting to the internet through DSL or cable modems.

Common Mistakes: Students may confuse the direction of encapsulation, thinking that Ethernet frames are encapsulated inside PPP frames, which is incorrect.

Explanations: PPPoE is designed to encapsulate PPP frames inside Ethernet frames. This encapsulation allows PPP to be used over Ethernet networks, which is essential for connecting to the internet through DSL or cable modems. The PPP frames are wrapped inside Ethernet frames to ensure compatibility with Ethernet infrastructure.

Option Analysis:

Option A: Correct. PPPoE encapsulates PPP frames inside Ethernet frames.
Option B: Incorrect. This would imply that Ethernet frames are encapsulated inside PPP frames, which is not the case.
Option C: Incorrect. PPPoE is not primarily for the security of Ethernet frames.
Option D: Incorrect. PPPoE is not primarily for the security of PPP frames.

734. A part of a network system that assigns IP Address.

Correct Answer: Correct answer is: (C) Dynamic Host Control Protocol.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: The Dynamic Host Control Protocol (DHCP) is a network management protocol used to dynamically assign IP addresses to devices on a network.

Common Mistakes: Students may confuse DHCP with DNS, as both are network protocols, but they serve different functions.

Explanations: The Dynamic Host Control Protocol (DHCP) is responsible for assigning IP addresses to devices on a network. It automates the process of IP address assignment, making network management more efficient. This protocol ensures that each device on the network has a unique IP address, which is essential for communication between devices.

Option Analysis:

Option A: A client is a device that requests services from a server, but it does not assign IP addresses.
Option B: A DNS server translates domain names into IP addresses, but it does not assign IP addresses to devices.
Option C: The Dynamic Host Control Protocol (DHCP) is the correct answer as it is responsible for assigning IP addresses to devices on a network.
Option D: A server provides services to clients but does not inherently assign IP addresses unless it is running a DHCP service.

735. A registrar first verifies that requested domain name is unique and then enters it into DNS

Correct Answer: Correct answer is: (A) Database.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: The registrar verifies the uniqueness of a domain name and then enters it into a database managed by DNS servers.

Common Mistakes: Students may confuse DNS servers with the database where domain names are stored.

Explanations: The registrar first checks the uniqueness of the requested domain name by querying the DNS database. Once verified, the registrar updates the DNS database to include the new domain name. DNS servers use this database to resolve domain names to IP addresses. Therefore, the correct answer is that the registrar enters the domain name into a database.

Option Analysis:

Option A: Correct. The registrar updates the DNS database with the new domain name.
Option B: Incorrect. DNS servers use the database but do not directly store the domain names.
Option C: Incorrect. Domains are not entered into a separate domain entity but into a database.
Option D: Incorrect. DNS is a protocol, not a storage location for domain names.

Mnemonic: DNS = Database Not Servers

736. Process on each machine that communicate at a given layer is called

Correct Answer: Correct answer is: (A) Peer-to-peer.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Easy

Concept notes: Processes on each machine that communicate at a given layer are called peer-to-peer processes.

Common Mistakes: Students may confuse peer-to-peer with physical transmission, which refers to the actual transfer of data over a physical medium.

Explanations: In a network, processes on different machines that communicate at the same layer are known as peer-to-peer processes. This means that these processes are at the same level in the network protocol stack and communicate directly with each other, adhering to the same protocol rules and standards.

Option Analysis:

Option A: Correct. Peer-to-peer processes are those that communicate at the same layer in the network protocol stack.
Option B: Incorrect. Physical transmission refers to the actual transfer of data over a physical medium, not the processes communicating at a given layer.
Option C: Incorrect. Node-to-node communication refers to the transfer of data between nodes in a network, not the processes communicating at a given layer.
Option D: Incorrect. Hop-to-hop communication refers to the transfer of data between adjacent nodes in a network, not the processes communicating at a given layer.

737. TCP connection is..... stream.

Correct Answer: Correct answer is: (A) Byte.

Exam Relevance: Computer Networks, CCNA, CISSP

Difficulty: Moderate

Concept notes: TCP (Transmission Control Protocol) is a byte-stream protocol, meaning it transmits data as a continuous stream of bytes.

Common Mistakes: Students often confuse TCP with other protocols like UDP, which is message-oriented, leading to incorrect assumptions about the nature of TCP's data transmission.

Explanations: TCP operates as a byte-stream protocol, which means it sends and receives data as a continuous stream of bytes. This is in contrast to message-oriented protocols like UDP, which send data in discrete packets. The byte-stream nature of TCP ensures reliable, ordered, and error-checked delivery of data, making it suitable for applications that require a steady and reliable data flow.

Option Analysis:

Option A: Correct. TCP is a byte-stream protocol.
Option B: Incorrect. TCP does not operate at the bit level directly.
Option C: Incorrect. TCP is not message-oriented; it is byte-stream oriented.
Option D: Incorrect. TCP does not send data in discrete packets; it sends a continuous stream of bytes.

Mnemonic: Byte Stream, TCP's Theme

738. You are connecting your access point and it is set to root. What does Extended Service Set ID mean?

Correct Answer: Correct answer is: (A) That you have more than one access point and they are in the same SSID connected by a distribution system.

Exam Relevance: CCNA, CompTIA Network+, CIW Network Administrator

Difficulty: Moderate

Concept notes: The Extended Service Set ID (ESSID) refers to a network configuration where multiple access points share the same SSID and are interconnected through a distribution system.

Common Mistakes: Students may confuse ESSID with SSID, thinking they are the same. ESSID is a broader concept that includes multiple access points, while SSID is the name of a single wireless network.

Explanations: The correct answer is that an ESSID involves multiple access points sharing the same SSID and being connected by a distribution system. This configuration allows seamless roaming between access points for clients, as they all belong to the same logical network.

Option Analysis:

Option A: Correct. This option accurately describes the ESSID concept.
Option B: Incorrect. Separate SSIDs would not form an ESSID.
Option C: Incorrect. Physical placement does not define an ESSID.
Option D: Incorrect. A repeater access point does not define an ESSID.

Mnemonic: ESSID: Extended Service Set ID, Imagine a network of islands (access points) all under the same flag (SSID).

739. ESP provides

Correct Answer: Correct answer is: (D) All of the mentioned.

Exam Relevance: CISSP, CCNA Security, CompTIA Security+

Difficulty: Moderate

Concept notes: The ESP (Encapsulating Security Payload) protocol provides security services for IP packets, including source authentication, data integrity, and privacy.

Common Mistakes: Students may overlook the comprehensive nature of ESP and only consider one or two of its security features.

Explanations: ESP provides source authentication by ensuring the sender of the packet is who they claim to be. It ensures data integrity by detecting any changes to the packet during transmission. Privacy is achieved through encryption, which protects the confidentiality of the data. Therefore, ESP encompasses all the mentioned security features.

Option Analysis:

Option A: Source authentication is a feature of ESP.
Option B: Data integrity is a feature of ESP.
Option C: Privacy is a feature of ESP.
Option D: All of the mentioned features are provided by ESP.

740. POST operations should be idempotent.

Correct Answer: Correct answer is: (B) False.

Exam Relevance: CISSP, CompTIA Security+, OSCP

Difficulty: Moderate

Concept notes: POST operations are not inherently idempotent. An idempotent operation is one that can be called multiple times without changing the result beyond the initial application. POST operations, however, are typically used to create new resources and can have different outcomes each time they are executed.

Common Mistakes: Students often confuse idempotency with the safety of HTTP methods. While GET is idempotent and safe, POST is neither idempotent nor safe.

Explanations: POST operations are designed to create new resources or perform actions that can have different outcomes each time they are executed. For example, submitting a form multiple times with POST can result in multiple entries being created. Therefore, POST operations are not idempotent, making the statement false.

Option Analysis:

Option A: Incorrect because POST operations are not idempotent.
Option B: Correct because POST operations can have different outcomes each time they are executed.
Option C: Incorrect because the idempotency of POST operations is consistently false.
Option D: Incorrect because the idempotency of POST operations is not conditional; it is consistently false.

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Computer networking MCQ - Set 74

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