Computer networking MCQ

1211. Omnidirectional antennas send out signals in

Correct Answer: Correct answer is: (D) All directions.

Exam Relevance: GCE A-Level, SAT II, AP Physics

Difficulty: Easy

Concept notes: Omnidirectional antennas are designed to radiate signals uniformly in all directions.

Common Mistakes: Students may confuse omnidirectional antennas with directional antennas, which radiate signals in a specific direction.

Explanations: Omnidirectional antennas are designed to emit signals in a spherical pattern, covering all directions equally. This is in contrast to directional antennas, which focus the signal in a specific direction. Therefore, the correct answer is that omnidirectional antennas send out signals in all directions.

Option Analysis:

Option A: Incorrect, as omnidirectional antennas do not send signals in just one direction.
Option B: Incorrect, as omnidirectional antennas do not send signals in only two directions.
Option C: Incorrect, as omnidirectional antennas do send signals in a specific pattern, which is all directions.
Option D: Correct, as omnidirectional antennas radiate signals uniformly in all directions.

1212. Which one of the following is true regarding VLANs?

Correct Answer: Correct answer is: (D) VTP is used to send VLAN information to switches in a configured VTP domain.

Exam Relevance: CCNA, CCNP, Network+

Difficulty: Moderate

Concept notes: VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used to manage VLAN configurations across multiple switches in a network.

Common Mistakes: Students may mistakenly believe that VTP is only used for VLAN creation or deletion, not for sending VLAN information.

Explanations: VTP is used to propagate VLAN information across a network of switches within a VTP domain. This ensures that all switches in the domain have consistent VLAN configurations. VTP allows for the addition, deletion, and renaming of VLANs, and it sends this information to all switches in the domain.

Option Analysis:

Option A: This is incorrect because only one VLAN (VLAN 1) is configured by default on all Cisco switches.
Option B: This is incorrect because VLANs can work in a mixed environment with non-Cisco switches, although VTP is a Cisco proprietary protocol.
Option C: This is incorrect because there is no specific limit to the number of switches in a VTP domain, although practical considerations may limit the number.
Option D: This is correct because VTP is used to send VLAN information to switches in a configured VTP domain.

Mnemonic: VTP = VLAN Trunking Protocol

1213. What connection type is best if you want to move around inside?

Correct Answer: Correct answer is: (B) Wi-fi.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Wi-fi allows for wireless internet connectivity, enabling users to move around freely within a coverage area.

Common Mistakes: Students may confuse Ethernet with Wi-fi, thinking that Ethernet is also wireless and allows for mobility.

Explanations: Wi-fi is the best connection type for moving around inside because it provides wireless internet access. This means users can maintain their internet connection while moving within the Wi-fi coverage area, unlike wired connections such as Ethernet which are stationary.

Option Analysis:

Option A: 4G is a mobile network technology, but it is typically used for outdoor mobility and may not provide consistent indoor coverage.
Option B: Wi-fi is the correct choice as it allows for wireless connectivity and mobility within a building or specific area.
Option C: Ethernet is a wired connection and does not allow for movement as the user is tethered to a physical cable.
Option D: Fibre optics is a high-speed internet technology, but it is typically a fixed, wired connection and does not support mobility.

1214. Which technology allows both a URL and an IP address to refer to the same site?

Correct Answer: Correct answer is: (C) DNS.

Exam Relevance: AP Computer Science Principles, A+ Certification, CompTIA Network+

Difficulty: Easy

Concept notes: DNS (Domain Name System) translates human-readable domain names (URLs) into IP addresses, allowing both to refer to the same site.

Common Mistakes: Students may confuse DNS with other internet protocols or services, such as HTML or GUI, which do not perform domain name resolution.

Explanations: DNS is a hierarchical and distributed naming system for computers, services, or other resources connected to the Internet or a private network. It translates domain names (URLs) into IP addresses, enabling users to access websites using easy-to-remember names instead of numerical IP addresses. This means that both a URL and an IP address can refer to the same site, as DNS ensures they are mapped to the same location.

Option Analysis:

Option A: ISP (Internet Service Provider) provides internet access but does not translate URLs to IP addresses.
Option B: GUI (Graphical User Interface) is a way to interact with computers and does not handle domain name resolution.
Option C: DNS (Domain Name System) translates domain names to IP addresses, allowing both to refer to the same site.
Option D: HTML (Hypertext Markup Language) is used to create web pages but does not translate URLs to IP addresses.

Mnemonic: DNS: Domain Name System, Decodes Names to Sites

1215. In a constellation diagra, M a signal element type is represented as a

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

Exam Relevance: Communications Engineering, Digital Signal Processing, Information Theory

Difficulty: Easy

Concept notes: In constellation diagrams, a signal element type is typically represented by a dot.

Common Mistakes: Students may confuse the representation of signal elements with lines or components, which are used for different purposes in the diagram.

Explanations: In constellation diagrams, each dot represents a specific signal element or symbol. This visual representation helps in understanding the modulation scheme and the possible signal states. Lines, X components, and Y components are used to show the relationships and positions of these signal elements but do not represent the elements themselves.

Option Analysis:

Option A: Correct. A dot represents a signal element in a constellation diagram.
Option B: Incorrect. Lines are used to show relationships between signal elements, not to represent the elements themselves.
Option C: Incorrect. X components are part of the coordinate system but do not represent signal elements.
Option D: Incorrect. Y components are part of the coordinate system but do not represent signal elements.

Mnemonic: Dot for dot, signal spot.

1216. Data communication is related to.....

Correct Answer: Correct answer is: (B) The transfer of encoded data between two locations.

Exam Relevance: Computer Networks, Data Communication, Telecommunication Engineering

Difficulty: Easy

Concept notes: Data communication involves the transmission of data from one point to another.

Common Mistakes: Students may confuse data communication with the transfer of information without encoding.

Explanations: Data communication specifically refers to the transfer of encoded data between two locations. Encoding is a crucial step as it converts the original data into a format suitable for transmission over a communication channel. This ensures that the data can be accurately transmitted and decoded at the receiving end.

Option Analysis:

Option A: This option is incorrect because data communication is not solely about the use of telecommunication. It involves the encoding and decoding of data as well.
Option B: This option is correct as it accurately describes data communication as the transfer of encoded data between two locations.
Option C: This option is incorrect because it does not specify the encoding process, which is a key component of data communication.
Option D: This option is incorrect because it includes the use of telecommunication, which is a means of transmission but not the core definition of data communication.

1217. In a.....connection, the server leaves the connection open for more requests after sending a response.

Correct Answer: Correct answer is: (A) Persistent connection.

Exam Relevance: Computer Networks, Data Communications, Network Security

Difficulty: Easy

Concept notes: In a persistent connection, the server maintains the connection open after sending a response, allowing for multiple requests and responses over the same connection.

Common Mistakes: Students may confuse persistent connections with nonpersistent connections, where the server closes the connection after each response.

Explanations: A persistent connection keeps the connection open after sending a response, enabling the client to send additional requests without the overhead of establishing a new connection each time. This is in contrast to a nonpersistent connection, where the server closes the connection after each response, requiring a new connection for each subsequent request.

Option Analysis:

Option A: Correct. Persistent connections keep the connection open for more requests.
Option B: Incorrect. Nonpersistent connections close the connection after each response.
Option C: Incorrect. Both options cannot be correct simultaneously.
Option D: Incorrect. The correct answer is provided.

Mnemonic: Persistent = Persistently open.

1218. If you have to send multimedia data over SMTP it has to be encoded into

Correct Answer: Correct answer is: (C) ASCII.

Exam Relevance: Computer Networks, Data Communication, IT Security

Difficulty: Moderate

Concept notes: SMTP (Simple Mail Transfer Protocol) is designed to handle text-based data. To send multimedia data, which is typically binary, it must be converted into a text format that can be transmitted over SMTP.

Common Mistakes: Students often mistakenly believe that binary data can be sent directly over SMTP without any conversion.

Explanations: Multimedia data, such as images or videos, is inherently binary. However, SMTP is designed to handle text-based data. To ensure compatibility with SMTP, binary data must be encoded into a text format. ASCII is a common encoding method used to convert binary data into a text format that can be transmitted over SMTP. This process is known as MIME (Multipurpose Internet Mail Extensions) encoding, which often uses ASCII-compatible encoding schemes like Base64.

Option Analysis:

Option A: Binary data cannot be directly sent over SMTP as it is not compatible with the text-based nature of the protocol.
Option B: Signal is not a valid encoding method for SMTP transmission.
Option C: ASCII is the correct answer as it is used to encode binary data into a text format compatible with SMTP.
Option D: This option is incorrect as ASCII is the correct encoding method for SMTP.

Mnemonic: ASCII - Always Send Characters In Simple Internet

1219. Which network topology is considered passive?

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: In a bus topology, all devices are connected to a single communication line, known as the bus. This topology is considered passive because the devices do not actively control the flow of data; instead, they listen for data that is transmitted on the bus and can only transmit data when the bus is not in use.

Common Mistakes: Students may confuse the bus topology with the star topology, where devices are connected to a central hub, which actively manages data flow.

Explanations: In a bus topology, the communication line (bus) is shared among all devices. Each device listens for data on the bus and can only transmit when the bus is free. This passive nature means that devices do not actively control the data flow, making the bus topology a passive network.

Option Analysis:

Option A: Cross is not a standard network topology.
Option B: In a star topology, devices are connected to a central hub, which actively manages data flow, making it an active topology.
Option C: In a mesh topology, each device is connected to multiple other devices, allowing for active control over data flow, making it an active topology.
Option D: In a bus topology, devices are connected to a single communication line and do not actively control data flow, making it a passive topology.

Mnemonic: Bus = Broadcast, Unidirectional, Shared

1220. All the computers in this topology are connected to one switch

Correct Answer: Correct answer is: (C) Star.

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: In a star topology, all devices are connected to a central hub or switch.

Common Mistakes: Students may confuse the star topology with the bus topology, where devices are connected to a single backbone cable.

Explanations: In a star topology, each computer is directly connected to a central switch. This central switch acts as a hub, facilitating communication between all connected devices. This configuration matches the description given in the question.

Option Analysis:

Option A: Bus topology connects devices to a single backbone cable, not a central switch.
Option B: Ring topology connects devices in a circular loop, not to a central switch.
Option C: Star topology connects all devices to a central switch, which matches the description.
Option D: None of the above is incorrect as the star topology fits the description.

Mnemonic: Star = Central Switch

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Computer networking MCQ - Set 122

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