WGU C172 - Network and Security Foundations Questions and Answers Already Graded A

WGU C172 - Network and Security Foundations Questions and Answers Already Graded A Application Layer Interacts with application programs that incorporate a communication component such as your internet browser and email. Bus Topology The computers share the media (coaxial cable) for data transmission. Cable Modem A modem that can use the high bandwidth of a cable television system to deliver high-speed data to and from the service provider. 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. Data Link Layer Layer of the OSI reference model that handles error recovery, flow control (synchronization), and sequencing. Deterministic Access to the network is provided at fixed time intervals. Ethernet, Physical, Hardware, or Adapter Address Other names for the MAC address. Firewall Protection Used to prevent unauthorized access to your network. Host Address Same as host number. Host Number The portion of the IP address that defines the location of the networking device connected to the network; also called the host address. Hotspots A limited geographic area that provides wireless access for the public. Hub Broadcasts the data it received to all devices connected to its ports. IANA The Internet Assigned Numbers Authority is the agency that assigns IP addresses to computer networks. ICMP Internet Control Message Protocol. IEEE Institute of Electrical and Electronics Engineers, one of the major standards-setting bodies for technological development. Intranet An internal network that provides file and resource sharing but is not accessed from the Internet. IP Address Unique 32-bit address that identifies on which network the computer is located as well as differentiates the computer from all other devices on the same network. 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. Mbps Megabits per second Mesh Topology All networking devices are directly connected to each other. 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 Accepts outgoing messages and combines messages or segments into packets, adding a header that includes routing information. 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 that identifies the manufacturer of the network hardware. OSI Open system interconnect. OSI Model The seven layers describing network functions. 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 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. 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 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 intranets. Protocol Set of rules established for users to exchange information. Range Extender Device that relays the wireless signals from an access point or wireless router into areas with a weak signal or no signal at all. RJ-45 The 8-pin modular connector used with CAT6/5