Đề thi, bài tập trắc nghiệm online Mạng máy tínhTrắc nghiệm Mạng máy tính Tiếng Anh Đăng vào 3 Tháng 5, 2026 bởi admin Trắc nghiệm Mạng máy tính Tiếng Anh Trắc nghiệm Mạng máy tính Tiếng Anh Số câu25Quiz ID40166 Làm bài Câu 1 What is the role of a default gateway in a local computer network? A It resolves domain names into IP addresses for local hosts B It assigns IP addresses to newly connected devices C It prevents external cyber attacks from entering the local network D It serves as an access point to route traffic to networks outside the local subnet Câu 2 If a Windows computer is configured for DHCP but cannot reach the DHCP server, which type of IP address will it automatically assign itself (usually starting with 169.254.x.x)? A APIPA (Automatic Private IP Addressing) B Multicast address C Static IP address D Loopback address Câu 3 Unlike a hub, how does a standard Layer 2 switch handle an incoming unicast frame with a known destination MAC address? A It broadcasts the frame out of all ports except the receiving port B It routes the frame to the default gateway C It forwards the frame only out of the specific port where the destination MAC address resides D It drops the frame unless it has an IP address attached Câu 4 What mechanism did early Ethernet networks use to handle data collisions on a shared medium? A CSMA/CD B Token Passing C CSMA/CA D Multiplexing Câu 5 What is the function of the Address Resolution Protocol (ARP) in a local area network? A It resolves domain names to IP addresses B It maps a known MAC address to an unknown IP address C It maps a known IPv4 address to an unknown MAC address D It dynamically assigns IP addresses to hosts Câu 6 Which IEEE standard defines the specifications for wireless local area networks (WLANs), commonly known as Wi-Fi? A 802.1Q B 802.1X C 802.3 D 802.11 Câu 7 Which technology allows multiple devices on a private local network to share a single public IP address for internet access? A Dynamic Host Configuration Protocol (DHCP) B Network Address Translation (NAT) C Spanning Tree Protocol (STP) D Border Gateway Protocol (BGP) Câu 8 Which port number is conventionally used for secure web traffic (HTTPS)? A 22 B 80 C 21 D 443 Câu 9 In the TCP three-way handshake process, what is the second step sent by the server to the client? A SYN B ACK C SYN-ACK D FIN Câu 10 What is the primary purpose of the Dynamic Host Configuration Protocol (DHCP)? A To automatically assign IP addresses and network parameters to client devices B To encrypt data transmitted over a public network C To route packets between different autonomous systems D To translate domain names into IP addresses Câu 11 Which OSI layer is responsible for end-to-end communication, reliability, and flow control? A Session layer B Data Link layer C Network layer D Transport layer Câu 12 Which of the following is an Exterior Gateway Protocol (EGP) used to route traffic between different Autonomous Systems on the internet? A RIP B EIGRP C BGP D OSPF Câu 13 In a network with a subnet mask of 255.255.255.0, what is the broadcast address for the network 192.168.1.0? A 192.168.1.0 B 192.168.1.255 C 192.168.255.255 D 192.168.1.1 Câu 14 Which underlying protocol does the 'ping' command use to test reachability between two network devices? A UDP B TCP C ICMP D ARP Câu 15 Which suite of protocols is widely used to authenticate and encrypt packets of data to provide secure communication over Virtual Private Networks (VPNs)? A GRE B IPsec C PPTP D SSL/TLS Câu 16 How many bits does an IPv6 address consist of? A 64 bits B 32 bits C 128 bits D 256 bits Câu 17 At which layer of the OSI model does a network router primarily operate? A Physical layer B Network layer C Transport layer D Data Link layer Câu 18 In CIDR notation, what does the '/24' indicate in the IP address '192.168.10.5/24'? A The network supports a maximum of 24 host devices B The first 24 bits of the address represent the network portion C The packet has a Time to Live (TTL) of 24 hops D The address is valid for 24 hours before needing renewal Câu 19 Which of the following best describes a key characteristic of the User Datagram Protocol (UDP)? A It establishes a three-way handshake before transmitting data B It is a connectionless protocol that does not guarantee delivery C It is primarily used for secure web browsing D It provides reliable data transfer through acknowledgments Câu 20 What is the primary benefit of implementing Virtual Local Area Networks (VLANs) on a switch? A They logically segment broadcast domains to improve network performance and security B They translate private IP addresses to public IP addresses C They encrypt traffic between the switch and the router D They physically connect multiple switches together to increase bandwidth Câu 21 Which type of transmission medium uses light pulses to transmit data over long distances with high bandwidth and immunity to electromagnetic interference? A Unshielded Twisted Pair (UTP) cable B Microwave radio C Fiber optic cable D Coaxial cable Câu 22 Which protocol is used to resolve human-readable domain names into IP addresses? A ARP B DNS C SMTP D DHCP Câu 23 What is the fundamental difference between HTTP and HTTPS protocols? A HTTPS encrypts the data payload using TLS/SSL, whereas HTTP transmits data in plain text B HTTP is used for web pages, whereas HTTPS is used for email C HTTP is faster because it uses UDP, whereas HTTPS uses TCP D HTTPS operates at the Network layer, whereas HTTP operates at the Application layer Câu 24 What critical network loop issue does the Spanning Tree Protocol (STP) prevent in a Layer 2 switched environment? A IP address conflicts B Routing loops C MAC spoofing D Broadcast storms Câu 25 Which of the following statements about a MAC address is true? A It is a logical address that changes based on the network you connect to B It is composed of 32 bits separated by periods C It is used to route packets across the internet D It is a 48-bit hardware address burned into the network interface card Trắc nghiệm Mạng máy tính DTU Trắc nghiệm Mạng máy tính chương 1
