Network + Practice Exam #

The correct answer is the presentation layer. In the OSI model, the presentation layer is responsible for formatting, encrypting, and compressing data to be sent across the network. It ensures that the data is in a format that can be understood by the receiving application. This layer also handles data encryption and decryption, as well as data compression to optimize the transmission.

The correct answer is the transport layer. The OSI model is a conceptual framework that defines the functions of a communication system. It is divided into seven layers, with each layer responsible for a specific set of tasks. The transport layer, which is level 4 of the OSI model, handles the reliable delivery of data between two endpoints. It ensures that data packets are delivered in the correct order and without errors. This layer also provides mechanisms for flow control and error recovery, making it essential for establishing a reliable communication channel.

The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers. Each layer has a specific role and interacts with the layers above and below it. Level 5 in the OSI model is the session layer. This layer is responsible for establishing, managing, and terminating sessions between applications. It ensures that data is transferred smoothly and error-free by handling synchronization, checkpointing, and recovery of data exchange. The session layer also manages security and authentication processes during communication sessions.

The correct answer is the data link layer. In the OSI model, level 2 is known as the data link layer. This layer is responsible for the reliable transmission of data between two nodes on a network. It handles error detection and correction, as well as the formatting and organization of data into frames for transmission. The data link layer also manages access to the physical network medium and controls how data is sent and received over the network.

The correct answer is physical layer. In the OSI model, the physical layer is the lowest level and is responsible for the actual transmission of data bits over a physical medium. It deals with the electrical, mechanical, and procedural aspects of the physical connection between devices. This layer defines the physical characteristics of the network such as cables, connectors, and signaling. It ensures that data is transmitted reliably and accurately across the network.

The transport layer of the network protocol stack is responsible for managing the end-to-end communication between two devices. It ensures reliable and efficient data transfer by breaking the data into smaller segments and reassembling them at the receiving end. A gateway is a hardware device that acts as an interface between different networks. It can connect networks with different protocols or architectures, allowing data to flow between them. Therefore, the transport layer may interact with gateways to facilitate communication between devices on different networks.

IRQ 3 is used for the communication ports COM2 or COM4. These ports are commonly used for serial communication in computer systems. IRQ (Interrupt Request) is a signal that allows devices to request attention from the CPU. In this case, IRQ 3 is specifically assigned to handle communication for COM2 or COM4 ports, which are used for connecting external devices such as modems, printers, or serial mice to the computer.

IRQ 13 is used for the math co-processor. The math co-processor is a specialized chip that assists the main processor in performing complex mathematical calculations. By using IRQ 13, the computer can efficiently handle mathematical operations and improve overall performance.

IRQ 6 is used for the floppy disk controller. This means that when a device connected to the floppy disk controller requires attention or wants to communicate with the computer's CPU, it will send an interrupt signal on IRQ 6. This allows the CPU to prioritize and handle the request from the floppy disk controller in a timely manner.

Port address 270h is commonly used for the parallel port LPT3. The LPT3 port is typically used for connecting printers or other parallel devices to a computer. The port address 270h refers to the hexadecimal address where the parallel port is located in the computer's memory. This address allows the computer to communicate with the connected device and send or receive data.

Port address 3f8h is commonly used for COM1. COM1 is the first serial communication port on a computer and is typically used for connecting devices such as modems, mice, and serial printers. The port address 3f8h is a hexadecimal representation of the base input/output address for COM1.

Port address 2f8h is commonly used for com2. This means that com2, also known as the second communication port, is assigned to the port address 2f8h. The port address is a hexadecimal value that represents the specific location in the computer's memory where data can be sent or received through the com2 port.

802.3u defines the standard for fast Ethernet. Fast Ethernet is a network technology that provides data transmission speeds of up to 100 megabits per second (Mbps). It is an extension of the original Ethernet standard (802.3) and is commonly used in local area networks (LANs) to support faster and more efficient data transfer. The 802.3u standard specifies the physical and data link layer protocols for fast Ethernet, ensuring compatibility and interoperability between different network devices.

The correct answer is the data link layer for token ring networks. The 802.5 standard defines the protocol and specifications for the data link layer in a token ring network. This layer is responsible for managing the transmission of data over the network, including addressing, error detection, and flow control. Token ring networks use a token passing mechanism to control access to the network, ensuring that only one device can transmit data at a time. The 802.5 standard provides guidelines for implementing this token passing mechanism and ensuring reliable and efficient communication within a token ring network.

The standard 802.11 defines wireless networking.

fiber optic uses modulated beams of light to transmit data.

The network layer deals with the management and routing of data packets across a network. A router is a hardware device that operates at the network layer and is responsible for directing network traffic between different networks. It uses routing tables to determine the best path for forwarding packets. On the other hand, a brouter is a hybrid device that combines the functionalities of a router and a bridge. It can operate at both the network layer and the data link layer, allowing it to handle both IP-based networks and non-IP-based networks.

the device driver for a network interface card works at a sublayer of the data link layer called the media access control (mac)sublayer, which is why the physical address of a nic is called its mac address.

The data link layer of a network deals with the bridge and switch hardware devices. A bridge connects multiple network segments together and forwards data packets between them based on their MAC addresses. A switch, on the other hand, is an advanced version of a bridge that can handle higher data rates and has more ports. It also uses MAC addresses to forward data packets but can do so simultaneously to multiple devices. Both bridge and switch devices play a crucial role in managing and directing network traffic efficiently.

although the other choices seem like a valid reason. the best and primary answer is to share resources.

the node in possession of the token is the only one that can send a message. the other workstations must wait until the token is available.

routers route packets over networks on the network layer.

one hop is one packet passing through one router.

Port address 280 is commonly used for network interface card (NIC). A NIC is a hardware component that allows a computer to connect to a network. It serves as the interface between the computer and the network, enabling the transmission and reception of data. Port addresses are numerical values assigned to specific services or processes running on a computer, and port 280 is specifically associated with NIC functionality.

peer based network has a practical limit of 10 computers that are connected by cabling for sharing files and hardware.

thin coax uses bnc-t connectors.

flow control uses signals between two devices to pause one while the other catches up.

netbeui in non routable.

beyond 10 workstations, the administration tasks become too much for most users.

attenuation is the distance point in the cable where the signal starts becoming unrecognizable.

the patch panel is used primarily to organize cabling as well as to provide ease of cable management and troubleshooting.

cat 3 is a 4 wire cable supporting bandwidth up to 10 mbps and is the minimum standard for a 10baseT network.

baseband transmission is a digital signal;broadband is an analog signal.

bridges and switches operate at the data link layer.

network (ip) addresses are used to reference locations beyond the local network.

rip(routing information protocol) uses route attributes to determine which route is the best at a given instance for a packet.

cat 4 and ibm type 3 cable are primarily used for token ring networks.
cat 5 cable supports speeds up to 100mbps.

the max segment length of thin coaxial cable is 185 meters.

fddi implements two counter rotating rings, fiber optic backbone technology, and has speeds up to 100mbps.

an active hub regenerates the signal before passing it along to its ports.

printers can be attached to the server, directly to the network,or to a workstation (remote printer)

Microsoft reverse engineered ipx/spx to create its own version called nwlink.

users can designate folders and devices as shared devices on their workstations and make them available to network users.

rpc enables users to access remote system files and resources.

routers and ip addressing create and designate internetworks.

pure ring topology is rarely implemented. instead, star-ring is used.

the data link layer prepares network packets for their trip across the data links network. The data link protocols may vary but would include the data being sent, information, an identifier for the sending machine, an identifier for the receiving machine, and error correction mechanism such as cyclic redundancy check.

fast Ethernet is any of the 100baseX standards. 100baseT4 uses four wire cable to implement fast Ethernet.

because its workstations only "hear" messages and do not regenerate them.

shielded twisted pair cable is commonly used in token ring networks.