Computer networking MCQ

1691. Which of the below is a valid protocol for email addresses?

Correct Answer: Correct answer is: (B) An '@' character must be used.

Exam Relevance: SAT, ACT, GED, TOEFL

Difficulty: Easy

Concept notes: Email addresses follow a standard format that includes an '@' character.

Common Mistakes: Students may confuse the '@' character with other symbols like '&' or '/' that are not part of the standard email format.

Explanations: The '@' character is a required component of an email address. It separates the local part (username) from the domain part (e.g., example.com). This character is universally recognized and used in all valid email addresses.

Option Analysis:

Option A: The '&' character is not a valid component of an email address format.
Option B: The '@' character is the correct and required symbol in an email address.
Option C: The '/' character is not a valid component of an email address format.
Option D: The '*' character is not a valid component of an email address format.

Mnemonic: At the heart of email, '@' is key.

1692. MAC addresses are also known as?

Correct Answer: Correct answer is: (D) Both a and b.

Exam Relevance: CCNA, CompTIA Network+, A+

Difficulty: Easy

Concept notes: MAC addresses are identifiers assigned to network interfaces for communications at the data link layer of a network segment.

Common Mistakes: Students may confuse MAC addresses with IP addresses, which are used at the network layer.

Explanations: MAC addresses are also known as hardware addresses or physical addresses. They are unique identifiers assigned to network interfaces for communication at the data link layer. IP addresses, on the other hand, are used at the network layer for routing packets across networks. Therefore, the correct answer is both hardware address and physical address.

Option Analysis:

Option A: Correct, MAC addresses are known as hardware addresses.
Option B: Correct, MAC addresses are also known as physical addresses.
Option C: Incorrect, IP addresses are a different type of address used at the network layer.
Option D: Correct, as both A and B are correct.

Mnemonic: MAC = Hardware, Physical

1693. Home networks are more likely to use a...

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

Exam Relevance: CCNA, Network+, CompTIA A+

Difficulty: Easy

Concept notes: Routers are commonly used in home networks to connect multiple devices to the internet and manage traffic between them.

Common Mistakes: Students may confuse routers with switches or hubs, which are less commonly used in home networks.

Explanations: Routers are essential in home networks because they provide internet connectivity to multiple devices and manage the flow of data between them. They can also perform functions such as NAT (Network Address Translation) and DHCP (Dynamic Host Configuration Protocol), which are crucial for home network operations.

Option Analysis:

Option A: Routers are the most common device for home networks to manage internet connectivity and traffic.
Option B: Switches are used in more complex networks to connect multiple devices but are less common in home settings.
Option C: Hubs are outdated and rarely used in modern home networks due to their limited functionality.

Mnemonic: Routers Route, Switches Switch, Hubs Hub.

1694. As a cable get ..... the signal can become too weak packets can be dropped.

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

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

Difficulty: Moderate

Concept notes: As a cable length increases, signal strength decreases due to attenuation.

Common Mistakes: Students may confuse the effect of cable length with other factors like cable width or signal type.

Explanations: In data transmission, longer cables result in greater signal attenuation. This means that as the cable length increases, the signal strength diminishes over the distance. When the signal becomes too weak, it can lead to packet loss, where data packets are not successfully transmitted to the destination. Therefore, the correct answer is that as a cable gets longer, the signal can become too weak, leading to packet drops.

Option Analysis:

Option A: Narrower cables do not directly affect signal strength in the same way as length does.
Option B: Longer cables result in greater signal attenuation, leading to weaker signals and potential packet loss.
Option C: Shorter cables would generally result in stronger signals, not weaker ones.
Option D: Wider cables do not directly impact signal strength in the context of signal attenuation.

Mnemonic: Longer cables, weaker signals, packet loss.

1695. "Networks in which all computers have an equal status are called .....network"

Correct Answer: Correct answer is: (C) Peer to peer.

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

Difficulty: Easy

Concept notes: In a peer-to-peer network, all computers have equal status and can communicate directly with each other without the need for a central server.

Common Mistakes: Students may confuse peer-to-peer networks with client-server networks, where one or more computers act as servers and others as clients.

Explanations: In a peer-to-peer network, each computer (or node) can act as both a client and a server. This means that any computer can share resources or data directly with any other computer in the network. This equal status among all computers is a defining characteristic of a peer-to-peer network.

Option Analysis:

Option A: The Internet is a global network of interconnected networks, not a type of network structure where all computers have equal status.
Option B: In a client-server network, there is a clear distinction between servers (which provide resources) and clients (which request resources).
Option C: Peer-to-peer networks are characterized by all computers having equal status and the ability to communicate directly with each other.
Option D: "Network" is a general term and does not specify the type of network structure where all computers have equal status.

1696. A security layer used in mobile devices that employ the Wireless Applications Protocol (WAP).

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

Exam Relevance: CISSP, CompTIA Security+, Network+

Difficulty: Moderate

Concept notes: WTLS (Wireless Transport Layer Security) is a security protocol used in WAP (Wireless Application Protocol) to provide secure communication over wireless networks.

Common Mistakes: Students may confuse WTLS with WPA (Wi-Fi Protected Access), which is a security protocol for Wi-Fi networks, not specifically for WAP.

Explanations: WTLS is specifically designed to secure the transport layer in WAP, ensuring that data transmitted over wireless networks is protected. It provides encryption, authentication, and integrity checks to safeguard the communication. WPA, on the other hand, is a security protocol for Wi-Fi networks and does not apply to WAP. LEAP (Lightweight Extensible Authentication Protocol) is an authentication protocol used in wireless networks but is not a security layer for WAP.

Option Analysis:

Option A: WPA is a security protocol for Wi-Fi networks, not specifically for WAP.
Option B: WTLS is the correct security layer used in WAP to provide secure communication over wireless networks.
Option C: LEAP is an authentication protocol used in wireless networks but is not a security layer for WAP.

1697. What is different about WiFi and MiFi?

Correct Answer: Correct answer is: (B) MiFi strictly uses wireless networks, WiFi does not?.

Exam Relevance: SAT, ACT, AP Computer Science Principles

Difficulty: Moderate

Concept notes: MiFi and WiFi are both wireless technologies, but they operate differently. MiFi is a portable mobile hotspot that uses cellular networks to provide internet access, while WiFi connects to a local wireless network.

Common Mistakes: Students may confuse MiFi with WiFi because both provide wireless internet access. However, the key difference lies in the underlying network technology used.

Explanations: MiFi strictly uses wireless networks, specifically cellular networks, to provide internet access. It acts as a portable mobile hotspot, allowing devices to connect to the internet through a cellular data connection. In contrast, WiFi connects devices to a local wireless network, which may or may not be connected to the internet through a wired connection. Therefore, the statement that MiFi strictly uses wireless networks, while WiFi does not, is correct.

Option Analysis:

Option A: This option is incorrect because the difference between WiFi and MiFi is not just about the initial letters of their names.
Option B: This option is correct because MiFi uses cellular networks, which are wireless, while WiFi can connect to a wired internet source.
Option C: This option is incorrect because WiFi can be used in various locations, not just at home.
Option D: This option is incorrect because MiFi is used by many people, especially those who need internet access on the go.

1698. A ..... is a network that covers a large geographical area.

Correct Answer: Correct answer is: (D) Wide area network (WAN).

Exam Relevance: CCNA, Network+, CIW

Difficulty: Easy

Concept notes: A wide area network (WAN) is a network that spans a large geographical area, such as a city, country, or even globally.

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

Explanations: A wide area network (WAN) is designed to connect devices over a large geographical area, such as different cities or countries. This makes it the correct choice for a network that covers a large geographical area.

Option Analysis:

Option A: A Local Area Network (LAN) covers a small geographical area, such as a single building or campus.
Option B: A Wireless LAN (WLAN) is a type of LAN that uses wireless technology, but still covers a small geographical area.
Option C: A Metropolitan Area Network (MAN) covers a larger area than a LAN but smaller than a WAN, typically a city or large campus.
Option D: A Wide Area Network (WAN) covers a large geographical area, such as different cities or countries.

Mnemonic: WAN: Wide Area Network, "W" for "Worldwide"

1699. What is the difference between a switch and a hub?

Correct Answer: Correct answer is: (B) A switch sends packets directly to their destination, but a hub sends them to the entire network.

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

Difficulty: Moderate

Concept notes: A switch and a hub are both networking devices, but they operate differently in how they handle data packets.

Common Mistakes: Students often confuse the functions of a switch and a hub, thinking that both devices operate in the same manner.

Explanations: A switch is a more advanced device that uses MAC addresses to direct data packets to specific devices on a network. It creates a dedicated path for each packet, improving efficiency and reducing network congestion. In contrast, a hub is a simpler device that broadcasts all incoming data packets to every connected device, which can lead to collisions and reduced network performance.

Option Analysis:

Option A: This is incorrect because the cost of a hub or switch is not the primary difference between them.
Option B: This is correct because a switch uses MAC addresses to send packets directly to their destination, while a hub broadcasts packets to all connected devices.
Option C: This is incorrect because it reverses the functions of a switch and a hub.
Option D: This is incorrect because the number of ports is not the defining characteristic that differentiates a switch from a hub.

Mnemonic: Switch Direct, Hub Broadcast

1700. SAN stand for...

Correct Answer: Correct answer is: (C) Storage area network.

Exam Relevance: CompTIA Network+, Cisco CCNA, Microsoft Certified: Azure Administrator Associate

Difficulty: Very Easy

Concept notes: SAN stands for Storage Area Network, which is a high-speed network that provides block-level access to storage.

Common Mistakes: Students may confuse SAN with other acronyms like SAN (Store Area Network) or misinterpret the term as a general network type.

Explanations: SAN is an acronym for Storage Area Network. It is a specialized, high-speed network designed to provide block-level access to storage devices. This network is used to connect servers to storage devices, such as disk arrays and tape libraries, and is optimized for high performance and low latency.

Option Analysis:

Option A: Incorrect. "Store Area Network" is not a recognized term in networking or storage technology.
Option B: Incorrect. "Story Area Network" is not a recognized term in networking or storage technology.
Option C: Correct. "Storage area network" is the correct term for SAN.
Option D: Incorrect. "Srorge Area Network" is not a recognized term in networking or storage technology.

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Computer networking MCQ - Set 170

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