Computer networking MCQ – Change your future

491. Which security measure?: Scrambles data packets using a cipher so that they cannot be read by unauthorised users.

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

Exam Relevance: AP Computer Science Principles, GCSE Computer Science, A-Level Computing

Difficulty: Easy

Concept notes: Encryption is a security measure that scrambles data packets using a cipher to prevent unauthorized access.

Common Mistakes: Students may confuse encryption with other security measures like firewalls or anti-malware, which do not scramble data packets.

Explanations: Encryption scrambles data packets using a cipher, making it unreadable to unauthorized users. This ensures that only authorized users with the correct decryption key can access the data.

Option Analysis:

Option A: A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It does not scramble data packets.
Option B: Anti-malware software is designed to detect, prevent, and remove malicious software. It does not scramble data packets.
Option C: A password is a secret word or string of characters used for authentication purposes. It does not scramble data packets.
Option D: Encryption scrambles data packets using a cipher to prevent unauthorized access, making it the correct answer.

Mnemonic: Cipher Scramble Key

492. Which of the following describes the function of ARP?

Correct Answer: Correct answer is: (A) It is used to map a 32-bit IP address to a 48-bit ethernet address.

Exam Relevance: CCNA, CISSP, CompTIA Network+

Difficulty: Moderate

Concept notes: Address Resolution Protocol (ARP) is a crucial network protocol used to map IP addresses to physical (MAC) addresses.

Common Mistakes: Students often confuse the direction of the mapping, believing ARP maps MAC addresses to IP addresses instead of the other way around.

Explanations: ARP is used to map a 32-bit IP address to a 48-bit ethernet (MAC) address. This is necessary because while IP addresses are used for logical addressing in a network, ethernet addresses are required for physical communication between devices on a local network. When a device needs to send data to another device on the same network, it uses ARP to find the corresponding MAC address for the destination IP address.

Option Analysis:

Option A: Correct. ARP maps a 32-bit IP address to a 48-bit ethernet address.
Option B: Incorrect. This reverses the direction of the mapping.
Option C: Incorrect. This incorrectly states the bit sizes and direction of the mapping.
Option D: Incorrect. This incorrectly states the bit sizes and direction of the mapping.

493. Coaxial cable possesses higher tensile strength than optical fibre.

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

Exam Relevance: Electrical Engineering, Telecommunications, Materials Science

Difficulty: Moderate

Concept notes: Coaxial cables are made of materials that provide higher tensile strength compared to optical fibers.

Common Mistakes: Students may confuse the tensile strength of the materials used in coaxial cables and optical fibers, leading to incorrect assumptions.

Explanations: Coaxial cables are constructed with a central conductor surrounded by an insulating material, a braided shield, and an outer jacket. The braided shield and outer jacket contribute significantly to the cable's tensile strength. In contrast, optical fibers are made of glass or plastic and are more fragile, lacking the robust outer layers that provide additional strength to coaxial cables.

Option Analysis:

Option A: Correct. Coaxial cables have higher tensile strength due to their construction.
Option B: Incorrect. Optical fibers are more fragile and do not possess the same tensile strength as coaxial cables.

Mnemonic: Cable Strong, Fiber Fragile

494. Network connections are created using

Correct Answer: Correct answer is: (A) Wires and cables.

Exam Relevance: IT Essentials, CompTIA A+, Network+

Difficulty: Easy

Concept notes: Network connections are established through physical or wireless mediums. Physical connections are made using wires and cables.

Common Mistakes: Students may confuse network connections with the devices or resources that are connected, such as computers or files.

Explanations: Network connections are created using physical mediums like wires and cables. These allow data to be transmitted between devices. Files and resources are not used to create connections, but rather are the data that is transmitted over the network. Computers and printers are devices that can be connected to a network, but they do not create the network connection itself.

Option Analysis:

Option A: Correct. Wires and cables are used to create network connections.
Option B: Incorrect. Files and resources are not used to create network connections.
Option C: Incorrect. Computers and printers are devices that can be connected to a network, but they do not create the network connection.

Mnemonic: Wires and cables, not files or devices.

495. Which one of these items describes a LAN?

Correct Answer: Correct answer is: (A) A computer network covering a small geographic area, like a home, office, school, or group of buildings.

Exam Relevance: IT Essentials, CompTIA A+, Network+

Difficulty: Easy

Concept notes: A LAN (Local Area Network) is a computer network that spans a small area, such as a home, office, or school.

Common Mistakes: Students may confuse LAN with WAN (Wide Area Network), which covers a larger geographic area.

Explanations: A LAN is defined by its limited geographic coverage, typically within a single building or a small group of buildings. This makes it distinct from a WAN, which spans larger areas such as cities, states, or countries.

Option Analysis:

Option A: This option correctly defines a LAN as a network covering a small geographic area, such as a home, office, or school.
Option B: This option describes a WAN (Wide Area Network), which covers a broad area and is not a LAN.

Mnemonic: LAN: Local Area Network, think "Local" for "Little" area.

496. How many bytes create an IP Address?

Correct Answer: Correct answer is: (A) 4 bytes.

Exam Relevance: CCNA, CompTIA Network+, AP Computer Science Principles

Difficulty: Easy

Concept notes: An IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication. It is typically represented in dotted-decimal notation, which consists of four groups of numbers separated by dots.

Common Mistakes: Students often confuse the number of bytes with the number of octets or the number of bits in an IP address.

Explanations: An IP address is composed of 32 bits, which is equivalent to 4 bytes. Each byte is represented by an 8-bit number, and these numbers are separated by dots in the dotted-decimal notation. Therefore, an IP address is made up of 4 bytes.

Option Analysis:

Option A: Correct. An IP address is composed of 4 bytes.
Option B: Incorrect. 2 bytes would be 16 bits, which is insufficient for a full IP address.
Option C: Incorrect. 1 bit is far too small to represent an IP address.
Option D: Incorrect. 2 terabytes is an extremely large amount of data, far exceeding the size of an IP address.

497. Setting to block MAC Address of the computer or mobile devices?

Correct Answer: Correct answer is: (B) MAC Filtering.

Exam Relevance: CISSP, CompTIA Network+, CCNA

Difficulty: Moderate

Concept notes: MAC Filtering is a security feature that allows network administrators to control access to a network by specifying which MAC addresses are allowed to connect.

Common Mistakes: Students often confuse MAC Filtering with IP Filtering, as both are methods to control network access, but they operate on different layers of the network.

Explanations: MAC Filtering is the correct answer because it specifically blocks or allows devices based on their MAC addresses. This method is used to control which devices can connect to a network by comparing the MAC address of each device against a list of allowed or blocked addresses. IP Filtering, on the other hand, controls access based on IP addresses, which can be more easily changed or spoofed compared to MAC addresses.

Option Analysis:

Option A: IP Filtering controls access based on IP addresses, not MAC addresses.
Option B: MAC Filtering controls access based on MAC addresses, which is the correct method for blocking specific devices.
Option C: Traffic Filtering is a broader term that can include various methods of controlling network traffic, but it does not specifically refer to blocking by MAC address.
Option D: Address Filtering is a general term and can refer to filtering based on IP addresses or other types of addresses, not specifically MAC addresses.

Mnemonic: MAC = Manage Access Control

498. *The IP Address is basically considered.....

Correct Answer: Correct answer is: (D) A unique number.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: An IP address is a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication.

Common Mistakes: Students may confuse IP addresses with domain names or think they are a combination of characters and numbers.

Explanations: An IP address is a unique number assigned to each device on a network. It is used to identify and locate devices on the network. The IP address is not a sum of numbers, a total of characters, or unique characters; it is a unique numerical identifier.

Option Analysis:

Option A: Incorrect, as IP addresses are not a sum of numbers.
Option B: Incorrect, as IP addresses are not a total of characters.
Option C: Incorrect, as IP addresses are not unique characters.
Option D: Correct, as IP addresses are unique numbers.

Mnemonic: IP = Internet Protocol, a unique number.

499. Show an example of circuit switched network?

Correct Answer: Correct answer is: (A) Public telephone network.

Exam Relevance: Computer Networks, Telecommunications, Network Fundamentals

Difficulty: Easy

Concept notes: A circuit-switched network establishes a dedicated path between two points for the duration of a communication session.

Common Mistakes: Students may confuse circuit-switched networks with packet-switched networks, which do not establish a dedicated path.

Explanations: The public telephone network is an example of a circuit-switched network. When a call is made, a dedicated circuit is established between the caller and the recipient for the duration of the call. This ensures a continuous and stable connection, which is essential for voice communication.

Option Analysis:

Option A: Correct. The public telephone network uses circuit switching to establish a dedicated path for each call.
Option B: Incorrect. A pager system typically uses a broadcast or simplex communication method, not circuit switching.
Option C: Incorrect. The Internet uses packet switching, where data is broken into packets and each packet may take a different route to the destination.
Option D: Incorrect. TV broadcast systems use a one-to-many communication model, not circuit switching.

500. The basic advantages of the computer network is

Correct Answer: Correct answer is: (B) Easy to communicate.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Easy

Concept notes: Computer networks facilitate communication between different devices and users over a shared infrastructure.

Common Mistakes: Students may confuse the advantages of computer networks with potential security risks like hacking.

Explanations: The basic advantage of a computer network is that it allows for easy communication between different devices and users. This means that information can be shared quickly and efficiently, enhancing collaboration and productivity.

Option Analysis:

Option A: Hacking is not an advantage but a potential security risk associated with computer networks.
Option B: Easy to communicate is a fundamental advantage of computer networks, as it enables quick and efficient sharing of information.
Option C: Network down refers to a situation where the network is not functioning, which is a disadvantage rather than an advantage.

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Computer networking MCQ - Set 50

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