Wgu D315 Comprehensive Questions And Solutions

WGU D315 COMPREHENSIVE QUESTIONS
AND SOLUTIONS


◉ OSI Layer 6
Answer: Presentation - Data representation & encryption (SSH,
SSL, IMap, FTP, JPeg)


◉ OSI Layer 5
Answer: Session - Connection maintenance (API's sockets)


◉ OSI Layer 4
Answer: Transport - End to end connection (TCP, UDP)


◉ OSI Layer 3
Answer: Network - Logical addressing for data path using packets
(IP, ICMP, IGMP)


◉ OSI Layer 2
Answer: Data Link - Physical addressing , formatting data in
frames (Switches, Bridges, Ethernet)


◉ OSI Layer 1

,Answer: Physical - Physical transmission of signals, media or
binary raw bits (Coax, Fiber, Wireless)


◉ TCP/IP Layer 4
Answer: Application - OSI layers 7, 6, and 5 - HTTPS, FTP, Telnet,
NTP, DHCP, Ping


◉ TCP/IP Layer 3
Answer: Transport - OSI layer 4 - TCP, UDP (Port address)


◉ TCP/IP Layer 2
Answer: Network - OSI layer 3 - IP, ARP, ICMP, IGMP (IP Address)


◉ TCP/IP Layer 1
Answer: network Interface - OSI layer 1 &2 - Ethernet (MAC
Address)


◉ Hub
Answer: Layer 1 - Connection point for a wired network (Dumb
Device). Not used in IT anymore


◉ Switch
Answer: Layer 2 - Primary device for inter connecting wired
components (Smart Device). Learns which MAC address live on

, which port and keeps a table of a MAC address to port
assignment. Only send data to the correct recipient.


◉ Wireless Access Point
Answer: Layer 2 - Acts as a bridge, It takes all wireless clients and
bridges them to the wired network. Uses MAC addresses to make
forwarding decisions.


◉ Router
Answer: Layer 3 - move data between one IP network to another


◉ Modem
Answer: Layer 2 - allows your ISP to provide service to your house
or business.


◉ Bridge
Answer: Layer 2 - A device that connects multiple networks or
network segments into a single network


◉ Repeater
Answer: Layer 1 - A network node that amplifies incoming signals
and rebroadcast them over a wider area.


◉ Cat 3
Answer: 10 Mbps up to 100m