DCOM 101 Final Exam QUESTIONS ACCURATE AND VERIFIED ACTUAL EXAM QUESTIONS WITH DETAILED ANSWERS FOR GUARANTEED PASS | ALREADY GRADED A

1. What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device? A. Acknowledgment number B. Window size C. Sequence number D. Port number Rationale: Sequence numbers ensure that segments are reassembled in the correct order at the receiving end. 2. What layer is responsible for making sure that the data that it sends and receives is in a format that the receiving and sending computers can understand? A. Layer 4 B. Layer 5 C. Layer 6 D. Layer 7 Rationale: The Presentation layer (Layer 6) handles data translation, encryption, and compression. 3. What is the IEEE standard that governs all forms of Ethernet media and interfaces? A. 802.11 B. 802.15 C. 802.1X D. 802.3 Rationale: IEEE 802.3 defines the standards for Ethernet networking. 4. What is a PDU? A. Protocol Download Utility B. Physical Data Unit C. Packet Delivery Unit D. Unit of information used by each layer Rationale: A Protocol Data Unit (PDU) is the data exchanged at a particular OSI layer. 5. The ____________ reference model is a general framework for networking systems that uses a layered approach to reduce its complexity. A. TCP/IP B. ISO C. OSI D. IEEE Rationale: The OSI (Open Systems Interconnection) model is a conceptual framework used to understand network interactions. 6. One of the problems that can occur in the Network layer is the incorrect configuration of a host's IP address. A. True B. False Rationale: The Network layer is responsible for IP addressing, so an incorrect IP setup causes network issues. 7. Which layer is responsible for determining the best path a packet should travel across an internetwork? A. Transport B. Data Link C. Session D. Network Rationale: The Network layer (Layer 3) is in charge of routing and path selection. 8. One job that a router performs is that of gatekeeper, which means that it can be configured to only allow certain packets access into the network based on a list of rules. What is that process called? A. Packet filtering B. Port forwarding C. Access control D. Routing Rationale: Access control lists (ACLs) on routers manage traffic based on defined rules. 9. What information would you find in the header of a Transport layer PDU? A. MAC address B. Protocol version C. Window size D. Subnet mask Rationale: The Transport layer includes fields such as window size to manage flow control. 10. The Network layer communicates with the Data Link layer and the Session layer. A. True B. False Rationale: The Network layer communicates directly only with the layers above and below it (Transport and Data Link, not Session). 11. Which layer is responsible for the encoding of signals? A. Data Link B. Session C. Network D. Physical Rationale: The Physical layer (Layer 1) handles the transmission and encoding of bits into signals over the media. 12. The ____________ layer is the bottom layer, whose job it is to convert bits into signals and vice versa. A. Transport B. Session C. Data Link D. Physical Rationale: The Physical layer is responsible for converting data to and from electrical or optical signals. 13. The maximum transmission unit for Ethernet is 1518 bytes. A. True B. False Rationale: Ethernet frames have a maximum transmission unit (MTU) of 1518 bytes, including headers and trailer. 14. Which of the following are protocols that you find at the Application layer of the OSI model? A. SNMP B. FTP C. DHCP D. ICMP Rationale: SNMP, FTP, and DHCP operate at Layer 7. ICMP operates at the Network layer. 15. The PDU at the Data Link layer is called a ____________. A. Packet B. Frame C. Segment D. Bit Rationale: Each OSI layer uses its own term for data. The Data Link layer uses "Frame." 16. How can you find out what your MAC address is? (Choose all that apply.) A. Open a command prompt and type getmac B. Open a command prompt and type ipconfig /all C. Right-click on the Local Area Connection and choose Status D. Ping 127.0.0.1 Rationale: All three options listed will reveal the MAC address; pinging localhost (127.0.0.1) will not. 17. The ____________ layer of the TCP/IP model combines the top three layers of the OSI model into one layer. A. Network B. Application C. Transport D. Internet Rationale: The Application layer in TCP/IP includes OSI’s Application, Presentation, and Session layers. 18. Which is the IEEE standard that sets the standards for wireless networking? A. 802.3 B. 802.5 C. 802.11 D. 802.15 Rationale: IEEE 802.11 defines standards for wireless LANs (Wi-Fi). 19. The Transport layer is the same in both the OSI model and the TCP/IP model. A. True B. False Rationale: The Transport layer exists in both models and serves the same function— end-to-end communication. 20. At which layer would you find errors that were caused by EMI (Electromagnetic Interference)? A. Data Link B. Network C. Transport D. Physical Rationale: EMI affects the transmission of electrical signals, which occurs at the Physical layer. 21. What type of routing protocol are RIP and RIPv2? A. Link-state B. Path-vector C. Distance-vector D. Static Rationale: RIP and RIPv2 are classic distance-vector routing protocols that use hop count as their metric. 22. What is the name of the value assigned to a routing protocol to indicate its reliability compared with other routing protocols that might be in use on the same router? A. Hop count B. Metric C. Administrative distance D. Convergence rate Rationale: Administrative distance is used by routers to select the best routing source when multiple protocols are available. 23. Which of the following is not a function that would be found in a managed switch? A. VLAN support B. Port mirroring C. Spanning Tree Protocol D. The ability to transfer its switching table to neighboring switches Rationale: Managed switches do not share their MAC address tables with neighboring switches. 24. Which of the following would be found in a routing table on a router? (Choose all that apply.) A. Timestamp B. Metric C. Next hop D. Destination network Rationale: Routing tables contain destination networks, metrics, next hops, and may include timestamps. 25. A switch that is configured to use the Spanning Tree Protocol will place a port in ____________ mode if sending traffic to it may cause a switching loop. A. Forwarding B. Learning C. Listening D. Blocking Rationale: STP places ports in blocking mode to prevent loops in the network. 26. Access control lists can be configured based on which of the following? (Choose all that apply.) A. Source IP address B. Destination network C. MAC address D. Protocol Rationale: ACLs can be based on source/destination IP, protocols, and ports. MAC address filtering is not typically done via ACLs. 27. A ____________ is used to make connections between the network interface card and the other vital components of the computer, such as the central processing unit. A. Port B. Bus C. NIC D. Router Rationale: A bus is an internal pathway for data between the NIC and components like the CPU. 28. Which advanced feature of a NIC allows a computer to download an OS from the network instead of from a local drive? A. VLAN tagging B. Boot sector scanner C. Preboot Execution Environment (PXE) D. OS loader Rationale: PXE allows computers to boot from a network location and is useful in diskless environments. 29. On a router configured to use RIP, the number of routers a packet must travel between before it reaches its destination is called what? (Choose two.) A. Hop count B. Path weight C. Delay D. Metric Rationale: RIP uses hop count as its metric, and both terms describe the routing decision factor in RIP. 30. All network switches require substantial configuration before they can be put into operation in a network. A. True B. False Rationale: Unmanaged switches require no configuration and can operate out of the box.