NEWT 208 WEEK 1 QUIZ

Overview

This quiz covers fundamental concepts in network design, focusing on the hierarchical design of LANs (Local Area Networks), the OSI model, and WAN technologies. The quiz includes questions on the layers of the OSI model, the hierarchical LAN campus design, and specific WAN technologies like frame-relay and point-to-point protocols.

Question 1: Hierarchical LAN Campus Network Design

A typical enterprise hierarchical LAN campus network design usually includes a three-layer design. The first of these three layers is the Access Layer.

• Explanation: The Access Layer is responsible for connecting end devices, such as computers and printers, to the network. It provides access to the rest of the network and is the first point of entry for users. The Access Layer plays a critical role in managing network traffic, implementing security policies, and ensuring that devices can connect to the network.

Question 2: Network Model in Design

A network model is a useful high-level tool for designing a reliable network infrastructure. It breaks the complex problem of network design into smaller and more manageable areas. This is known as creating network layers.

• Explanation: Network models use layers to separate different functions of the network, making it easier to manage and troubleshoot. The most common model is the OSI model, which has seven layers, each responsible for different aspects of network communication.

Question 3: Distribution and Core Layer Functions

The three-tier hierarchical design maximizes performance, network availability, and the ability to scale the network design. When the Distribution layer and Core layer functions are implemented by a single device, this is known as a collapsed core.

• Explanation: A collapsed core design is used in smaller networks where combining the Distribution and Core layers into a single layer simplifies the network architecture without compromising performance. This design reduces costs and simplifies management but may not be suitable for large-scale networks.

Question 4: OSI Layers in WAN Networks

WAN networks primarily work on the Physical, Data Link, and Network layers of the OSI Reference model.

• Explanation: The Physical layer deals with the transmission of raw data bits over a physical medium. The Data Link layer is responsible for error detection and correction, while the Network layer handles routing and forwarding of data packets across the network. Together, these layers enable the transmission of data across WANs.

Question 5: Nonbroadcast Multi-Access (NBMA) WAN Technology

A simple Layer 2 nonbroadcast multi-access (NBMA) WAN technology used to interconnect enterprise LANs, where a single router interface can be used to connect to multiple sites using PVCs of varying speeds up to 4 Mbps, is called Frame-Relay.

• Explanation: Frame Relay is a WAN technology that provides a cost-effective way to connect multiple LANs over a wide area. It uses Permanent Virtual Circuits (PVCs) to establish connections between sites, allowing for efficient data transmission without the need for dedicated leased lines.