WGU C172 Network and Security - Foundations.docx

protocol - correct answer The set of rules established for users to exchange information topology - correct answer The network architecture used to interconnect the networking equipment deterministic network - correct answer Each station connected to the network is ensured access for transmission of its messages at regular or fixed time intervals bus topology - correct answer The computers share the media (coaxial cable) for data transmission ThinNet - correct answer The coaxial cable used in a bus network. star topology - correct answer Twisted-pair cables connect the devices to a central hub or switch hub - correct answer A multiport repeater device used at the center of a star topology multiport repeater - correct answer The data it receives is broadcast and seen by all devices connected to its ports. A hub. broadcast - correct answer Transmission of data by a hub to all devices connected to its ports switch - correct answer Device used at the center of a star topology that forwards a frame it receives directly out the port associated with its destination address mesh topology - correct answer All networking devices are directly connected to each other, allows for full redundancy OSI model - correct answer The seven layers describing network functions Physical layer - correct answer Provides the electrical and mechanical connection to the network (cabling, NICs). 1st OSI layer Data link layer - correct answer Handles error recovery, flow control (synchronization), and sequencing (MAC, Ethernet). 2nd OSI layer Network layer - correct answer Accepts outgoing messages and combines messages or segments into packets, adding a header that includes routing information (IP, IPX). 3rd OSI layer Transport layer - correct answer Concerned with message integrity between source and destination (TCP, UDP). 4th OSI layer Session layer - correct answer Provides the control functions necessary to establish, manage, and terminate the connections (NSF, SQL). 5th OSI layer Presentation layer - correct answer Accepts and structures the messages for the application (ASCII, JPEG). 6th OSI layer Application layer - correct answer Interacts with application programs that incorporate a communication component such as your Internet browser and email (HTTP, FTP, SMTP). 7th OSI layer 3 basic steps to isolate network problem - correct answer Is the connection to the machine down? (layer 1) Is the network down? (layer 3) Is a service on a specific machine down? (layer 7) CSMA/CD - correct answer The Ethernet LAN media-access method, carrier sense multiple access with collision detection Ethernet - correct answer LAN protocol created in 1972 and standardized in 1980 using CSMA/CD. Frame - correct answer Contains the header, data, and trailer (the padding and 4-byte CRC frame check sequence) Frame header - correct answer Consists of the preamble, start frame delimiter, destination and source addresses, and length/type field 64 bytes - correct answer Minimum length of an Ethernet frame 1518 bytes - correct answer Maximum length of an Ethernet frame MAC address - correct answer A unique 6-byte/48-bit address assigned by the vendor of the network interface card displayed in 12 hex digits Organizationally unique identifier (OUI) - correct answer The first 3 bytes of the MAC address that identifies the manufacturer of the network hardware ipconfig /all - correct answer Enables the MAC address information to be displayed from the command prompt IANA - correct answer The agency that assigns IP addresses to computer networks IP address - correct answer 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 Class A networks - correct answer Governments, very large networks. Range from 0.0.0.0 to 126.255.255.255. Example: 44.x.x.x Class B networks - correct answer Midsize companies, universities, and so on. Range from 128.0.0.0 to 191.255.255.255. Example: 128.123.x.x Class C networks - correct answer Small networks. Range from 192.0.0.0 to 223.255.255.255 Example: 192.168.1.x Class D networks - correct answer Reserved for multicast groups. Range from 224.0.0.0 to 239.255.255.255. Example: 224.x.x.x Class E networks - correct answer Experimental, not used on the Internet. Range from 240.0.0.0 to 254.255.255.255 Network number - correct answer The portion of the IP address that defines which network the IP packet is originating from or being delivered to Host number - correct answer The portion of the IP address that defines the location of the networking device connected to the network; also called the host address Host address - correct answer Another name for the host number ipconfig - correct answer Command used to display the computer's address Private addresses - correct answer IP addresses set aside for use in private intranets Intranet - correct answer An internal network that provides file and resource sharing but is not accessed from the Internet IP internetwork - correct answer A network that uses IP addressing for identifying devices connected to the network 3 blocks for private IP addresses - correct answer 10.0.0.0-10.255.255.255 172.16.0.0-172.31.255.255 192.168.0.0-192.168.255.255 Wired network - correct answer Uses cables and connectors to establish the network connection Wireless network - correct answer Uses radio signals to establish the network connection Wi-Fi - correct answer Wi-Fi Alliance—an organization that tests and certifies wireless equipment for compliance with the 802.11x standards 802.11a - correct answer Wireless standard, 54Mbps, 75 ft, 5Ghz 802.11b - correct answer Wireless standard, 11Mbps, 100-150 ft, 2.4GHz 802.11g - correct answer Wireless standard, 54Mbps, 150 ft, 2.4GHz 802.11n - correct answer Wireless standard, 4 x 802.11g speeds (200+Mbps). 2.4GHz or 5GHz 802.11ac - correct answer Latest wireless standard, single-station data transfer rates of 500Mbps, 5Ghz wireless router - correct answer Device used to interconnect wireless networking devices and to give access to wired devices and establish the broadband Internet connection to the ISP access point - correct answer A transceiver used to interconnect a wireless and a wired LAN Broadband gateway - correct answer Combines a modem and router in one unit. Also referred to as a broadband modem range extender - correct answer Device that relays the wireless signals from an access point or wireless router into areas with a weak signal/no signal hotspots - correct answer A limited geographic area that provides wireless access for the public Service Set Identifier (SSID) - correct answer Wireless network name Wi-fi Protected Setup (WPS) - correct answer Simplifies Wi-Fi configuration but vulnerable to brute force attacks Stateful Packet Inspection (SPI) - correct answer Firewall technique that inspects incoming data packets to make sure they correspond to an outgoing request Virtual Private Network (VPN) - correct answer Establishes a secure network connection, a way to protect your LAN's data from being observed by outsiders