WGU C172 Study Guide Questions and Answers 2024

VPN - ecrypts traffic between sites through public internet PPP - point to point protocol - authentication, compression and error detection - no encryption used for VPN PPTP - Tunneling protocol, used for authentication and encryption IPsec works on what layer of the OSI model - Layer 3 IPsec - Authentication and ecryption for every packet, outside world does not see anything. RADIUS - Remote access authentication Unicast - 1 to 1 used for web surfing, file transfers Multicast - IPv6, 1 to many, multimedia + stock exchanges Braodcast - sent to everyone on local subnet, routing updates and ARP requests Light source of fiber optic cables - Usually infrared Single Mode -Fiber - nm + highly directional and modulated, used with lasers Multi Mode - Fiber - 850-1310nm Modal Dispersion - broadening of pulse due to different path lengths taken Chromatic Dispersion - broadening of pulse due to different propagation velocities of spectral components Polarization - broadening of light pulse due to propagation velcoities of x + y components "2 deep" rule - limits distribution into a building 2 deep responsivity - a measure of the output current for a given light power launched into the diode response speed - the maximum data rate capability of the detector Logical Fiber Map - Shows fiber that is interconnected and data distributed through the campus Physical Fiber Map - Shows the routing of the fiber, also detail terrain, undergroung conduit and entries to building What is MIMO - Space division multiplexing technique. data streams are split into spatial streams doubling data rate WiMAX How long? - 30 miles WiMAX Frequency? - 3.5GHZ but in U.S. 2.5Ghz and 5.8Ghz What wireless standard use Bluetooth - 802.11b 802.11a - 54Mbps/5Ghz What wireless standard is not backwards compatible - 802.11a 802.11g - 54Mbps/2.4Ghz 80211.b - 11mbps/2.4Ghz 802.11n - 200Mbps/2.4Ghz + 5Ghz Which wireless standard operates at 2.4Ghz and 5 Ghz? - 802.11n Which wireless standard uses MIMO - 802.11n A typical network uses which type of cabling? - twisted pair and Fiber Bridging table - Mac Address Routing table - IP address needed to route data ARP Requests - Adress Resolution Protocol - maps ip address to mac address ARP Table - ARP Cache - Temporarily stored MAC Adresses recently contacted What command is used to view the ARP Cache - arp -a An Association indicates? - The destination address is for a networking device connected to one of the ports on the bridge Ping uses what protocol? - ICMP - internet control message protocol