Computer networking MCQ

1161. In IEEE 802.11, when a frame is going from one AP to another AP in a wireless distribution syste, M the address flag is.....

Correct Answer: Correct answer is: (D) 11.

Exam Relevance: IEEE 802.11 certification exams, Network+ exams

Difficulty: Moderate

Concept notes: In IEEE 802.11, the address flag in the frame control field indicates the format of the addresses used in the frame. When a frame is transmitted between two access points (APs) in a wireless distribution system (WDS), the address flag is set to 11.

Common Mistakes: Students often confuse the address flag values with the frame type or subtype, leading to incorrect answers.

Explanations: In a WDS, frames are transmitted between APs, and the address flag must be set to 11 to indicate this specific format. This ensures that the frame is correctly interpreted by the receiving AP. The address flag value of 11 is specifically designated for WDS frames, distinguishing them from other frame types.

Option Analysis:

Option A: 0 is incorrect as it does not indicate a WDS frame.
Option B: 1 is incorrect as it does not indicate a WDS frame.
Option C: 10 is incorrect as it does not indicate a WDS frame.
Option D: 11 is correct as it indicates a WDS frame.

1162. This type of network is located in multiple buildings, cities or countries

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: A WAN (Wide Area Network) is a network that spans a large geographical area, such as multiple buildings, cities, or countries.

Common Mistakes: Students may confuse WAN with LAN (Local Area Network), which is limited to a smaller area like a single building or campus.

Explanations: A WAN is designed to connect devices over large geographical distances, such as different cities or countries. This makes it suitable for networks that span multiple buildings, cities, or countries. In contrast, a LAN is limited to a smaller area, such as a single building or campus.

Option Analysis:

Option A: LAN (Local Area Network) is incorrect because it is limited to a smaller geographical area, such as a single building or campus.
Option B: WAN (Wide Area Network) is correct because it can span multiple buildings, cities, or countries.
Option C: Either (A) or (B) is incorrect because only WAN fits the description of spanning multiple buildings, cities, or countries.
Option D: Neither (A) nor (B) is incorrect because WAN is the correct choice.

Mnemonic: WAN - Wide Across Nations

1163. SONET stands for

Correct Answer: Correct answer is: (A) Synchronous optical network.

Exam Relevance: Networking exams, Telecommunications exams, Computer Science exams

Difficulty: Very Easy

Concept notes: SONET stands for Synchronous Optical Network, which is a standard for transmitting a wide range of digital traffic over optical fiber with standardized protocols for framing and multiplexing.

Common Mistakes: Students may confuse SONET with other network technologies or acronyms that sound similar.

Explanations: SONET is a standard for transmitting digital traffic over optical fiber. The acronym stands for Synchronous Optical Network, which accurately describes its function of synchronizing data transmission over optical networks.

Option Analysis:

Option A: Correct. SONET stands for Synchronous Optical Network.
Option B: Incorrect. The term "Synchronous operational network" is not a recognized acronym for SONET.
Option C: Incorrect. "Stream optical network" is not a recognized acronym for SONET.
Option D: Incorrect. "Shell operational network" is not a recognized acronym for SONET.

Mnemonic: SONET: Sync Optical Network, Think Fiber

1164. Border Gateway Protocol (BGP) first time appeared in

Correct Answer: Correct answer is: (A) 1989.

Exam Relevance: CCNA, CCNP, CISSP, CompTIA Network+

Difficulty: Easy

Concept notes: The Border Gateway Protocol (BGP) is a standardized exterior gateway protocol used to exchange routing information between different autonomous systems on the Internet. It was first introduced in 1989.

Common Mistakes: Students may confuse the year of BGP's introduction with other significant dates in the history of the Internet, such as the establishment of ARPANET in 1969.

Explanations: BGP was first introduced in 1989 as a way to manage routing between different autonomous systems on the Internet. This protocol is crucial for the Internet's scalability and reliability, as it allows for the exchange of routing information between different networks.

Option Analysis:

Option A: Correct. BGP was first introduced in 1989.
Option B: Incorrect. 1979 is not the correct year for the introduction of BGP.
Option C: Incorrect. 1969 is the year ARPANET was established, not BGP.
Option D: Incorrect. 1959 is not related to the introduction of BGP.

1165. In half-duplex data transmission

Correct Answer: Correct answer is: (C) Data can be transmitted in both directions.

Exam Relevance: GATE, GRE, CCNA

Difficulty: Easy

Concept notes: In half-duplex data transmission, communication can occur in both directions, but not simultaneously.

Common Mistakes: Students may confuse half-duplex with full-duplex, where data can be transmitted in both directions simultaneously.

Explanations: Half-duplex communication allows data to be transmitted in both directions, but not at the same time. This means that the communication channel can be used for sending and receiving data, but only one direction at a time. This is different from full-duplex, where data can be transmitted in both directions simultaneously.

Option Analysis:

Option A: Incorrect, as half-duplex allows for bidirectional communication, not just one direction.
Option B: Incorrect, as the distance of transmission is not a defining characteristic of half-duplex communication.
Option C: Correct, as half-duplex allows for data transmission in both directions, albeit not simultaneously.
Option D: Incorrect, as option C is the correct answer.

Mnemonic: Half Duplex: Both Ways, Not Simultaneous

1166. Protocol Data Unit (PDU) is similar to

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

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: HDLC (High-Level Data Link Control) is a bit-oriented synchronous data link layer protocol that defines the structure of the data frames transmitted over a link. A Protocol Data Unit (PDU) is a unit of data that is transmitted between peer entities in a network. HDLC defines the structure of PDUs, making it similar to the concept of a PDU.

Common Mistakes: Students may confuse HDLC with other data link layer protocols like LLC (Logical Link Control) or MAC (Media Access Control), which also deal with data transmission but have different functions and structures.

Explanations: HDLC defines the structure of the data frames, which are essentially PDUs. HDLC specifies the format and control mechanisms for these PDUs, making it directly related to the concept of PDUs. LLC and MAC, while also part of the data link layer, have different roles and do not define the structure of PDUs in the same way HDLC does.

Option Analysis:

Option A: LLC (Logical Link Control) is a sublayer of the data link layer that provides logical communication between devices. It does not define the structure of PDUs in the same way HDLC does.
Option B: HDLC (High-Level Data Link Control) defines the structure of data frames, which are PDUs, making it the correct answer.
Option C: MAC (Media Access Control) is responsible for controlling how data is transmitted over a physical medium. It does not define the structure of PDUs.
Option D: DSAP (Destination Service Access Point) is part of the LLC sublayer and is used to identify the destination service. It does not define the structure of PDUs.

1167. In reverse transmission of Interim Standard 95 (IS-95), symbols are divided into six-symbol

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

Exam Relevance: Wireless Communication Exams, Digital Communication Exams, Telecommunication Engineering Exams

Difficulty: Moderate

Concept notes: In IS-95 reverse transmission, symbols are organized into six-symbol units known as chunks.

Common Mistakes: Students may confuse chunks with frames, packets, or other data structures used in different communication protocols.

Explanations: In the reverse transmission of IS-95, symbols are divided into six-symbol units called chunks. This division is specific to the IS-95 protocol and is used to manage and process data efficiently in the reverse link. Frames, packets, and other representations are used in different contexts and protocols, but in IS-95 reverse transmission, the correct term for these six-symbol units is chunks.

Option Analysis:

Option A: Frames are used in other communication protocols but not specifically for the six-symbol units in IS-95 reverse transmission.
Option B: Chunks are the correct term for the six-symbol units in IS-95 reverse transmission.
Option C: Representation is a general term and does not specifically refer to the six-symbol units in IS-95 reverse transmission.
Option D: Packets are used in other communication protocols but not specifically for the six-symbol units in IS-95 reverse transmission.

1168. Some organizations were using X.25 (a virtual-circuit switching network) performed switching at the

Correct Answer: Correct answer is: (A) Network Layer.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: X.25 is a packet-switched wide area network (WAN) protocol that operates at the Network Layer of the OSI model. It uses virtual circuits for data transmission.

Common Mistakes: Students may confuse X.25 with other layers or protocols, such as the Data Link Layer or Transport Layer, due to the complexity of network protocols.

Explanations: X.25 operates at the Network Layer (Layer 3) of the OSI model. At this layer, X.25 performs switching by establishing virtual circuits between endpoints. These virtual circuits are logical connections that provide a reliable data transfer service. The Network Layer is responsible for routing and forwarding packets to their destination, which aligns with the functionality of X.25.

Option Analysis:

Option A: Correct. X.25 performs switching at the Network Layer.
Option B: Incorrect. There is no "Linear Layer" in the OSI model.
Option C: Incorrect. SONET (Synchronous Optical Network) is a physical layer protocol, not related to X.25 switching.
Option D: Incorrect. UPSR (Unidirectional Path Switched Ring) is a protection mechanism in SONET networks, not related to X.25 switching.

1169. Which of the following is not a guided medium?

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

Exam Relevance: Networking Fundamentals, Computer Science Exams, Telecommunications Exams

Difficulty: Easy

Concept notes: Guided media are physical pathways that guide signals from the sender to the receiver. They include coaxial cables, twisted pair wires, and fiber-optic cables. Atmosphere, on the other hand, is an unguided medium, which means it does not provide a physical pathway for signal transmission.

Common Mistakes: Students may confuse atmosphere with guided media because they might not fully understand the distinction between guided and unguided media.

Explanations: Guided media, such as coaxial cables, twisted pair wires, and fiber-optic cables, provide a physical pathway for signal transmission. Atmosphere, however, is an unguided medium, meaning it does not provide a physical pathway for signals. Instead, signals travel through the air without a defined physical path, making it the correct answer as it is not a guided medium.

Option Analysis:

Option A: Coaxial cable is a guided medium because it provides a physical pathway for signal transmission.
Option B: Twisted pair wire is a guided medium because it provides a physical pathway for signal transmission.
Option C: Fiber-optic cable is a guided medium because it provides a physical pathway for signal transmission.
Option D: Atmosphere is an unguided medium because it does not provide a physical pathway for signal transmission.

Mnemonic: Cable, Wire, Fiber - Guided, Air - Unguided

1170. In the process of fetching a web page from a server the HTTP request/response takes..... RTTs.

Correct Answer: Correct answer is: (B) 1.

Exam Relevance: Computer Networks, Data Communications, Network Fundamentals

Difficulty: Easy

Concept notes: The HTTP request/response process typically involves a single round-trip time (RTT) for a simple web page fetch.

Common Mistakes: Students often confuse the number of RTTs with the number of packets exchanged or the complexity of the request.

Explanations: In a basic HTTP request/response cycle, the client sends a request to the server, and the server responds with the requested web page. This process involves a single round-trip time (RTT) because the request and response are sent back and forth in one complete cycle.

Option Analysis:

Option A: Incorrect, as the process does not require two RTTs for a simple web page fetch.
Option B: Correct, as the process involves a single RTT for a simple web page fetch.
Option C: Incorrect, as the process does not require four RTTs for a simple web page fetch.
Option D: Incorrect, as the process does not require three RTTs for a simple web page fetch.

Mnemonic: HTTP: One Trip, One Page

⬅ Previous SetSet 117Next Set ➡

Computer networking MCQ - Set 117

Leave a Reply