WGU Network and Security-Foundations-C172 Questions and Answers Rated A+

WGU Network and Security-Foundations-C172 Questions and Answers Rated A+ Application Layer(7th layer) Interacts with application programs that incorporate a communication component such as your internet browser and email (provides user interface) Bus Topology The computers share the media (coaxial cable) for data transmission CAT6 (category 6) Twisted-pair cables capable of carrying up to 1000Mbps (1 gigabit) of data up to a length of 100 meters Crossover Transmit and receive signal pairs are crossed to properly align the transmit signal on one device with the receive signal on the other device CSMA/CD Carrier sense multiple access with collision detection is the Ethernet LAN media-access method (used to prevent collisions in wired Ethernet networks) Used in wireless networks for to reduce collisions. Data Link Layer (2nd layer) Layer of the OSI reference model that handles error control (synchronization), and sequencing controls which terminals are sending and receiving. Media access is controlled (MAC) by the Data Link Layer Deterministic Access to the network is provided at fixed time intervals Ethernet, Physical, Hardware, or Adapter Address Other names for MAC address Firewall Protection Used to prevent unauthorized access to your network Host Address/Number The portion of the IP address that defines the location of the networking device connected to the network also called the hose address Hotspots A limited geographic area that provides wireless access for the public Hub Broadcasts the data it receives to all devices connected to its ports... it is possible for network devices to pick up a data intended for a different device... considered a multiport repeater. Is on the Physical Layer (layer 1) IANA The Internet Assigned Numbers Authority is the agency that assigns IP addresses to computer networks ICMP Internet Control Message Protocol (preform diagnostics, report errors, control the flow of data in the network) IEEE Institute of Electrical and Electronics Engineers, on of the major standard-setting bodies for technological development Intranet An internal network the provides file and resource sharing but it's not accessed from the internet IP Address Unique 32-bit address the identifies on which network the computer is located as well as differentiate the computer from all other devices on the same network; they are logical addresses and can be found using the ipconfig/all command IP Internetwork A network that uses IP addressing for identifying devices connected to the network ipconfig/all Enables the MAC address information to be displayed from the command prompt ISP Internet service provider Link Integrity Test Protocol used to verify that a communication link between two Ethernet devices has been established. Link Light Indicates that the transmit and receive pairs are properly aligned Link Pulses Sent by each of the connected devices via the twisted-pair cables when data is not being transmitted to indicate that the link is still up Local Area Network (LAN) Network of users that share computer resources in a limited area MAC Address A unique 6-byte address assigned by the vendor of the network interface card; A MAC address has two portions. The OUI is comprised of the first 6 digits and the last half is assigned by the manufacturer. Mbps Megabits per second Mesh Topology All networking devices are directly connected to each other (fault tolerant; stations can still communicate if some segments go down) Multiport Repeater Another name for a hub Network Address Translation (NAT) Translates the private IP address to a public address for routing over the internet Network Interface Card(NIC) The electronic hardware used to interface the computer to the network Network Layer (3rd layer) Defines how data packets are routed in a network. Accepts outgoing messages and combines messages or segments into packets, adding a header that includes routing information (provides a logical path for data) Network Number The portion of the IP address that defines which network the IP packet is originating from or being delivered to Organizationally Unique Identifier (OUI) The first 3 bytes of the MAC address the identifies the manufacturer of the network hardware (ex. Network interface card has MAC address of A, the OUI is 00-00-86) OSI Open system interconnect OSI Model The seven layers describing network funcations overloading Where NAT translates the home network's private IP addresses to a single public IP address Packet Provides grouping of the information for transmission Physical Layer (1st layer) Layer of the OSI reference model that provides the electrical and mechanical connection to the network Describes the media that interconnects networking devices Ping Command used to test that a device on the network is reachable (If you can't connect to a networked computer, you can use the ping command to check connectivity) Used in windows in the command window Port address Translation (PAT) A port number is tracked with the client computer's private address when translating to a public address Ports The physical input/output interfaces to the networking hardware Presentation Layer (6th layer) Layer of the OSI reference model that accepts and structures the messages for the application Private Addresses IP addresses set aside for use in private intranet 10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255 Protocol Set of rules established for users to exchange