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Câu 1: In which network topology does a central device failure cause the entire network to go down, despite individual cable failures only affecting single nodes?

  • - Star topology
  • - Ring topology
  • - Mesh topology
  • - Bus topology

Câu 2: Which media access control mechanism is traditionally utilized in 802.11 wireless networks to proactively prevent data collisions over the airwaves?

  • - CSMA/CA
  • - CSMA/CD
  • - Token Passing
  • - ALOHA

Câu 3: At which layer of the OSI model does a network router primarily operate?

  • - Physical layer
  • - Network layer
  • - Transport layer
  • - Data Link layer

Câu 4: What is considered the primary security and performance benefit of implementing Virtual LANs (VLANs) on enterprise network switches?

  • - Increasing the physical bandwidth limits of cables
  • - Isolating broadcast domains
  • - Encrypting data frames automatically at layer 2
  • - Converting digital signals to analog frequencies

Câu 5: Why is UDP often preferred over TCP for real-time video streaming applications?

  • - It establishes a strict three-way handshake before sending data
  • - It provides built-in encryption for secure data transmission
  • - It has lower overhead and does not require acknowledgment of receipt
  • - It guarantees the delivery of all packets without packet loss

Câu 6: What is the primary benefit of implementing Virtual Local Area Networks (VLANs) on a switch?

  • - They logically segment broadcast domains to improve network performance and security
  • - They translate private IP addresses to public IP addresses
  • - They encrypt traffic between the switch and the router
  • - They physically connect multiple switches together to increase bandwidth

Câu 7: Which IEEE protocol is widely used to tag Ethernet frames with VLAN identification on trunk links?

  • - 802.1Q
  • - 802.1X
  • - 802.11ac
  • - 802.3ad

Câu 8: Which OSI layer is responsible for physical addressing and MAC address routing?

  • - Transport Layer
  • - Network Layer
  • - Data Link Layer
  • - Presentation Layer

Câu 9: What is the primary characteristic that distinguishes TCP from UDP in data transmission?

  • - TCP is connection-oriented and ensures reliable delivery, while UDP is connectionless
  • - TCP is faster than UDP for real-time video streaming applications
  • - UDP uses a three-way handshake to establish a secure session
  • - TCP operates exclusively at the Application layer of the OSI model

Câu 10: At a fundamental functional level, how does a basic network switch differ from a network hub?

  • - A switch operates at the Network layer, whereas a hub operates at the Data Link layer
  • - A switch requires IP addresses to forward traffic, whereas a hub uses MAC addresses
  • - A switch can only connect devices of the same type, whereas a hub connects different device types
  • - A switch forwards frames only to the specific port associated with the destination MAC address, whereas a hub broadcasts to all ports

Câu 11: What type of network security system monitors and controls incoming and outgoing network traffic based on predetermined security rules?

  • - Domain Controller
  • - Load Balancer
  • - Firewall
  • - Network Switch

Câu 12: What is the main purpose of establishing a Virtual Private Network (VPN) for remote workers?

  • - To increase the maximum bandwidth provided by the Internet Service Provider
  • - To create a secure and encrypted tunnel over a public network like the internet
  • - To physically connect two computers in the same room without using a local switch
  • - To convert analog telephone signals into digital data packets for VoIP calls

Câu 13: What is the primary function of the Domain Name System (DNS) in a computer network?

  • - To assign IP addresses dynamically to clients
  • - To filter malicious traffic entering a private network
  • - To encrypt data transmitted over the internet
  • - To translate human-readable domain names into IP addresses

Câu 14: What is the primary technical function of a subnet mask when applied in an IPv4 network environment?

  • - To define the maximum transmission unit size for the router
  • - To physically encrypt the payload of the outgoing IP packet
  • - To permanently resolve a domain name to a local IP address
  • - To distinguish the network portion from the host portion of an IP address

Câu 15: In legacy half-duplex Ethernet networks, what foundational mechanism is used to detect and handle simultaneous data transmissions that cause collisions?

  • - Token passing
  • - CSMA/CA
  • - Time Division Multiplexing
  • - CSMA/CD

Câu 16: Border Gateway Protocol (BGP) is classified as what specific type of routing protocol?

  • - Link-state routing protocol
  • - Path-vector routing protocol
  • - Distance-vector routing protocol
  • - Hybrid interior routing protocol

Câu 17: In traditional active mode File Transfer Protocol (FTP), which two specific TCP ports are normally utilized for control signals and data connections respectively?

  • - 22 and 23
  • - 21 and 20
  • - 80 and 443
  • - 25 and 110

Câu 18: In modern enterprise networking, what is the primary operational purpose of configuring Quality of Service (QoS) policies?

  • - To logically increase the total physical bandwidth of a link
  • - To prioritize specific types of network traffic
  • - To prevent unauthorized malicious access to the internal network
  • - To dynamically assign IP addresses based on user roles

Câu 19: Which protocol is explicitly designed for pushing and sending email messages between mail servers?

  • - Simple Mail Transfer Protocol (SMTP)
  • - Internet Message Access Protocol (IMAP)
  • - Post Office Protocol version 3 (POP3)
  • - File Transfer Protocol (FTP)

Câu 20: Which protocol is utilized to successfully map a known logical IPv4 address to an unknown physical MAC address on a local Ethernet subnet?

  • - RARP
  • - DHCP
  • - DNS
  • - ARP

Câu 21: Compared to copper twisted-pair cables, what is the primary advantage of using fiber optic cables in backbone networks?

  • - They are cheaper to manufacture and install
  • - They support Power over Ethernet (PoE) naturally
  • - They transmit data using electrical impulses
  • - They are immune to electromagnetic interference (EMI) and support higher bandwidth over longer distances

Câu 22: Which of the following accurately describes the structure of a standard MAC address?

  • - A dynamically assigned alphanumeric string
  • - A 128-bit hexadecimal number separated by colons
  • - A 48-bit hexadecimal number typically separated by colons or hyphens
  • - A 32-bit dotted-decimal number

Câu 23: Which IEEE 802.11 wireless standard operates exclusively in the 5 GHz frequency band and introduced wider channels for substantially higher throughput?

  • - 802.11b
  • - 802.11g
  • - 802.11n
  • - 802.11ac

Câu 24: Unlike wired Ethernet which uses CSMA/CD, what collision handling mechanism do standard 802.11 Wi-Fi networks use?

  • - Frequency Division Multiple Access (FDMA)
  • - Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
  • - Time Division Multiplexing (TDM)
  • - Token Passing

Câu 25: What is the primary reason for the development and global transition to IPv6?

  • - The elimination of hardware routers in local networks
  • - The exhaustion of available IPv4 addresses
  • - The need for shorter and simpler IP addresses
  • - The requirement to replace MAC addresses entirely

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