WGU C172 Network and Security - Foundations; PA and OA set***

It is a network of users that share computer resources in a limited area. - LAN Local Area Network - LAN How are Local Area Networks defined? - In terms of protocol and the topology used for accessing the network. A set of rules established for users to exchange information - Protocol The network architecture used to interconnect the networking equipment. - Topology What are the most common topologies for LANs? - Ring, Bus, and Star Uses a token that is placed in the data channel and circulates around the ring. - Token Ring topology A deterministic network - Token Ring Topology Each station connected to the network ensures access for transmission of its messages at regular or fixed time intervals - Deterministic What are the disadvantages of the Token Ring system? - 1. If an error changes the token pattern, it can cause the token to stop circulating. What is a disadvantage of the Token Ring system from the troubleshooting and maintenance? - The token ring path must be temporarily broken or interrupted if a computer or any device on the network is to be removed or added to the network. What is a solution to the troubleshooting and maintenance disadvantages of the Token Ring system? - Connect each computer or device on the network to a central token ring hub. A device that manages the passing of the token instead of relying on individual computers to pass it. - Token ring hub How does the token ring hub improve the network? - It improves the reliability of the network. Topology whereas the computers share the media or coaxial cable for data transmission. - Bus topology The coaxial cable that is looped through each networking device to transmit data in a bus topology - ThinNet In this topology, all devices on the network can see each other's data traffic. - Bus topology Topology whereas each computer must wait for pauses in transmission or until the transmission from one device is complete before initiating a new transmission onto the network. - Bus topology What are the disadvantages of a bus topology? - "1. Data can be corrupted if ore than one device on the network transmits at the same time and will have to be resubmitted. 2. The use of the shared coaxial cable prevents data transmission from being very bandwidth-efficient." Which topology is seldomly used in modern networks? - Bus topology What is the most common topology used in today's LANs? - Star topology Topology that uses twisted-pair cables with modular plugs to connect computers and other networking devices. - Star topology Topology whereas each device is connected to a switch or hub - Star A switch or hub facilitates the transfer of data between networking devices in this topology - star Transmits data to all the devices connected in the star network - hub Also called a multiport repeater - hub Not meant for large networks, but are still used in some smaller, slower speed LANs - hub A transmission from a hub in a star network to all the devices in the network connected to the hub - broadcast Stores the hardware or physical address for each device connected to its ports in a star network - switch Sends data transmissions directly to the port of the destination device on the network - switch The physical input/output interfaces to the networking hardware - port Where the cables physically connect to each other or a central switch or hub - Port Only the intended destination device on this network will see the data traffic - star What is an advantage of the star topology? - It improves the efficiency of the available bandwidth of the network What is an advantage of the star topology from the troubleshooting and maintenance? - A device can be removed or added without disrupting other devices on the network All devices are connected to each other - mesh topology What is an advantage of the mesh network? - It provides full redundancy in the network data paths What is a disadvantage of the mesh network? - The additional data paths increase the cabling cost and the network hardware cost. It is also very complex. What type of applications is the mesh topology suited for? - high-reliability applications What type of applications is the mesh topology not suited for? - general networking applications Open systems interconnect reference model - OSI Who was the OSI model developed by? - The International Organization for Standardization What year was the OSI model developed? - 1984 What is the purpose of the OSI model? - to enable different types of networks to be linked together What is OSI meant for? - To provide a framework for networking devices that ensure compatibility in the network hardware and software. What is the OSI model meant to accelerate? - The development of new networking technologies. What is layer 1 of the OSI model? - Physical The layer of the OSI model that provides the electrical and mechanical connection to the network. - physical UTP, fiber, and network interface cards are examples of which layer of the OSI model? - physicaL