Câu 1Nhận biết
Question 1. Which of the following is a primary function of the Presentation Layer (Layer 6) in the OSI model?
- AData format translation, encryption, and compression.
- BPath determination and logical addressing for packets.
- CEstablishing, managing, and terminating sessions.
- DReliable end-to-end delivery and flow control.
Câu 2Nhận biết
Question 2. In the TCP/IP model, which layer is responsible for logical addressing and determining the best path for data to travel across networks?
- AApplication Layer
- BInternet Layer
- CTransport Layer
- DNetwork Access Layer
Câu 3Nhận biết
Question 3. What is the main purpose of encapsulation in network communication?
- ATo convert digital signals into analog signals for transmission.
- BTo add protocol-specific control information at each layer.
- CTo select the most efficient physical path for data.
- DTo verify the user’s identity before granting network access.
Câu 4Nhận biết
Question 4. A set of rules that governs data communication between devices is known as a:
- ATopology
- BMedium
- CProtocol
- DSegment
Câu 5Nhận biết
Question 5. Which statement accurately distinguishes the TCP/IP model from the OSI model?
- AThe OSI model is more practical and widely implemented in modern networks.
- BThe TCP/IP model combines the OSI’s Session and Presentation layers into its Application layer.
- CThe TCP/IP model has seven layers, whereas the OSI model has four.
- DThe OSI model was developed by the US Department of Defense for the ARPANET.
Câu 6Nhận biết
Question 6. The process of a higher-level protocol data unit (PDU) being placed inside a lower-level PDU is called:
- ASegmentation
- BDe-encapsulation
- CFlow Control
- DEncapsulation
Câu 7Nhận biết
Question 7. Which layer of the OSI model is responsible for providing services directly to the user’s application, such as web browsing or email?
- ATransport Layer
- BApplication Layer
- CSession Layer
- DNetwork Layer
Câu 8Nhận biết
Question 8. A network device that operates only at the Physical Layer (Layer 1) and repeats all incoming signals to all connected ports is a:
- ASwitch
- BRouter
- CHub
- DBridge
Câu 9Nhận biết
Question 9. What is the primary function of a MAC (Media Access Control) address?
- ATo logically identify a device on a global internetwork.
- BTo uniquely identify a network interface card (NIC) on a local network.
- CTo specify the application port number for a communication.
- DTo locate the optimal route between source and destination networks.
Câu 10Nhận biết
Question 10. A Switch operates at which layer of the OSI model?
- ALayer 1 (Physical Layer)
- BLayer 2 (Data Link Layer)
- CLayer 3 (Network Layer)
- DLayer 4 (Transport Layer)
Câu 11Nhận biết
Question 11. Which of the following is a characteristic of Unshielded Twisted Pair (UTP) cabling?
- AIt is a cost-effective and commonly used cable for LANs.
- BIt is highly resistant to electromagnetic interference (EMI).
- CIt uses light pulses to transmit data over long distances.
- DIt is primarily used for backbone connections between buildings.
Câu 12Nhận biết
Question 12. The Data Link Layer is divided into which two sublayers?
- AThe Session and Presentation sublayers.
- BThe Physical and Network sublayers.
- CThe Logical Link Control (LLC) and Media Access Control (MAC) sublayers.
- DThe TCP and UDP sublayers.
Câu 13Nhận biết
Question 13. In a CSMA/CD network, what is the first action a device takes after detecting a collision?
- AIt immediately retransmits the corrupted frame.
- BIt transmits a jam signal to alert other devices.
- CIt shuts down its network interface to save power.
- DIt sends an error report to the network router.
Câu 14Nhận biết
Question 14. A device operating at the Network Layer that forwards packets between different networks based on IP addresses is known as a:
- ARepeater
- BSwitch
- CRouter
- DModem
Câu 15Nhận biết
Question 15. Which of the following IP addresses belongs to Class C?
- A172.16.30.5
- B10.25.11.4
- C224.0.0.9
- D193.168.1.10
Câu 16Nhận biết
Question 16. What is the purpose of the subnet mask in IP networking?
- ATo hide the IP address from unauthorized users.
- BTo distinguish the network portion from the host portion of an IP address.
- CTo translate a domain name into an IP address.
- DTo automatically assign an IP address to a new device on the network.
Câu 17Nhận biết
Question 17. The protocol responsible for resolving an IP address to a physical MAC address is:
- AARP (Address Resolution Protocol)
- BDHCP (Dynamic Host Configuration Protocol)
- CDNS (Domain Name System)
- DICMP (Internet Control Message Protocol)
Câu 18Nhận biết
Question 18. What is the loopback IP address, used for testing a machine’s own network stack?
- A255.255.255.255
- B192.168.0.1
- C127.0.0.1
- D0.0.0.0
Câu 19Nhận biết
Question 19. A routing protocol that uses “hop count” as its primary metric for path selection is:
- AOSPF (Open Shortest Path First)
- BBGP (Border Gateway Protocol)
- CRIP (Routing Information Protocol)
- DEIGRP (Enhanced Interior Gateway Routing Protocol)
Câu 20Nhận biết
Question 20. What information is contained in the header of an IP packet?
- AThe source and destination MAC addresses.
- BThe sequence number for reassembling a message.
- CThe port numbers for the application services.
- DThe source and destination IP addresses.
Câu 21Nhận biết
Question 21. What is a key difference between TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)?
- ATCP is connectionless, while UDP is connection-oriented.
- BTCP provides reliable delivery, while UDP offers faster, best-effort delivery.
- CTCP is used for DNS queries, while UDP is used for web browsing.
- DTCP uses IP addresses, while UDP relies on MAC addresses for delivery.
Câu 22Nhận biết
Question 22. In the context of the Transport Layer, what is a “port”?
- AA physical interface on a router or switch.
- BAn identifier used to distinguish between different applications running on a single host.
- CA security mechanism to block unwanted traffic.
- DA logical channel for a single data stream.
Câu 23Nhận biết
Question 23. The “three-way handshake” (SYN, SYN-ACK, ACK) is a process used by which protocol to establish a connection?
Câu 24Nhận biết
Question 24. The mechanism that prevents a fast sender from overwhelming a slow receiver is known as:
- AError detection
- BMultiplexing
- CFlow control
- DAuthentication
Câu 25Nhận biết
Question 25. Which of the following applications would be most suitable for using UDP?
- ALive video streaming
- BFile transfer (FTP)
- CEmail (SMTP)
- DSecure web browsing (HTTPS)
Câu 26Nhận biết
Question 26. The primary protocol used for browsing websites is:
- AFTP (File Transfer Protocol)
- BSMTP (Simple Mail Transfer Protocol)
- CHTTP (Hypertext Transfer Protocol)
- DTELNET
Câu 27Nhận biết
Question 27. The function of the Domain Name System (DNS) is to:
- AAutomatically assign IP configuration to hosts.
- BTranslate human-readable domain names into IP addresses.
- CTransfer files between a client and a server.
- DManage the secure transmission of web traffic.
Câu 28Nhận biết
Question 28. Which protocol is responsible for automatically assigning an IP address, subnet mask, and default gateway to a client device?
Câu 29Nhận biết
Question 29. When you send an email, which protocol does your email client typically use to send the message to your mail server?
- APOP3 (Post Office Protocol 3)
- BIMAP (Internet Message Access Protocol)
- CSMTP (Simple Mail Transfer Protocol)
- DHTTP (Hypertext Transfer Protocol)
Câu 30Nhận biết
Question 30. FTP (File Transfer Protocol) is unique because it uses two separate connections between client and server. These connections are for:
- ASending and receiving data simultaneously.
- BEstablishing a primary and a backup link.
- CControl commands and data transfer.
- DEncrypted traffic and unencrypted traffic.