WGU C172 NETWORK AND SECURITY FOUNDATIONS
OA 2024 NEWEST EXAM AND PRACTICE EXAM 350
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT) /ALREADY GRADED A+
Application Layer (Layer 7) - ANSWER: This layer is responsible for network
applications (like HTTP or FTP) and their production of data to be transferred over
the network.
Presentation Layer (Layer 6) - ANSWER: This layer is responsible for translating data
from the application layer into the format required to transmit data over the
network as well as encrypting the data for security if encryption is used.
Session Layer (Layer 5) - ANSWER: This layer is responsible for connection
establishment, session maintenance, and authentication.
Transport Layer (Layer 4) - ANSWER: This layer provides services to the application
layer and receives services from the network layer.
It is responsible for the reliable delivery of data.
It segments and reassembles data in the correct order for it to be sent to the
receiving device.
It may also handle the reliable delivery of data and any retries of data that are lost or
corrupt (for example, TCP does this). "The heart of OSI"
Network Layer (Layer 3) - ANSWER: This layer is responsible for the transmission of
data between hosts in different networks as well as the routing of data packets. This
layer is implemented through the use of devices such as routers and some switches.
Data Link Layer (Layer 2) - ANSWER: This layer is responsible for the error-free
delivery of data to the receiving device or node. This layer is implemented through
the use of devices such as switches and bridge devices, as well as anything with a
network interface, like wireless or wired network cards.
Physical Layer (Layer 1) - ANSWER: This layer is responsible for the physical
connections of the devices on the network. This layer is implemented through the
use of devices such as hubs, repeaters, modem devices, or physical cabling.
TCP/IP Application Layer (Layer 4) - ANSWER: =OSI layers: application, presentation,
session
includes HTTP, FTTP, Telnet, NTP, DHCP, PING
TCP/IP Transport Layer (Layer 3) - ANSWER: =OSI layer: transport
includes TCP and UDP
TCP/IP Network Layer (Layer 2) - ANSWER: =OSI layer: network
, includes IP, ARP, ICMP, IGMP
TCP/IP Network Interface Layer (Layer 1) - ANSWER: =OSI layers: data link and
physical
includes ethernet
Hub - ANSWER: OSI layer 1; connects the router to the network, takes the data
packers from the router, and sends them all to devices connected to the network
(ex: usb hub)
Modem - ANSWER: OSI layer 1; allows computer to transport digital info over analog
lines, such as phone or cable lines.
Repeater - ANSWER: OSI layer 1; a device used to strengthen, replicate, and
regenerate signals that are weakened (ex: because of distance) during transmission.
Switch - ANSWER: OSI layer 2; used to connect devices in a specific network and
allows them to communicate efficiently within the network. It is a more complex
vfersion of a hub. They can add security measures and function more inteligently,
sending traffic directly from the sender to the receiver without the other devices
being aware of the communication.
Bridge - ANSWER: OSI layer 2; similar to a router in that it connects two or more
networks. The difference is that a router analyzes data packets to determine wher to
send the packets next, whereas a bridge simply forwards the data to the next
network without analysis.
Router - ANSWER: OSI layer 3; a point of connection between two or more networks
that forward data packets between the networks. To have internet in your home you
have to have a router that connects the internet to the network of your home.
Cat3 UTP - ANSWER: supports up to 10 mbps for up to 100 meters and is commonly
used for phone lines.
Cat4 UTP - ANSWER: supports 16 Mbps for up to 100 meters and is not commonly
used today.
Cat5 UTP - ANSWER: used in ethernet LANs containing two twisted pairs allowing for
up to 100 mbps up to 100 meters between the device and the switch, hub or router.
Replaced mostly by Cat5e.
Cat5e UTP - ANSWER: doubles the number of twisted pairs to four for up to 1 gbps
over up to 100 meters.
Cat6 UTP - ANSWER: also used in ethernet LANs and data centers; made up of four
tightly woven twisted pairs (more twists per linear foot) and supports 1 gbps for up
to 100 meters or 10 gbps for up to 55 meters.
OA 2024 NEWEST EXAM AND PRACTICE EXAM 350
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100%
CORRECT) /ALREADY GRADED A+
Application Layer (Layer 7) - ANSWER: This layer is responsible for network
applications (like HTTP or FTP) and their production of data to be transferred over
the network.
Presentation Layer (Layer 6) - ANSWER: This layer is responsible for translating data
from the application layer into the format required to transmit data over the
network as well as encrypting the data for security if encryption is used.
Session Layer (Layer 5) - ANSWER: This layer is responsible for connection
establishment, session maintenance, and authentication.
Transport Layer (Layer 4) - ANSWER: This layer provides services to the application
layer and receives services from the network layer.
It is responsible for the reliable delivery of data.
It segments and reassembles data in the correct order for it to be sent to the
receiving device.
It may also handle the reliable delivery of data and any retries of data that are lost or
corrupt (for example, TCP does this). "The heart of OSI"
Network Layer (Layer 3) - ANSWER: This layer is responsible for the transmission of
data between hosts in different networks as well as the routing of data packets. This
layer is implemented through the use of devices such as routers and some switches.
Data Link Layer (Layer 2) - ANSWER: This layer is responsible for the error-free
delivery of data to the receiving device or node. This layer is implemented through
the use of devices such as switches and bridge devices, as well as anything with a
network interface, like wireless or wired network cards.
Physical Layer (Layer 1) - ANSWER: This layer is responsible for the physical
connections of the devices on the network. This layer is implemented through the
use of devices such as hubs, repeaters, modem devices, or physical cabling.
TCP/IP Application Layer (Layer 4) - ANSWER: =OSI layers: application, presentation,
session
includes HTTP, FTTP, Telnet, NTP, DHCP, PING
TCP/IP Transport Layer (Layer 3) - ANSWER: =OSI layer: transport
includes TCP and UDP
TCP/IP Network Layer (Layer 2) - ANSWER: =OSI layer: network
, includes IP, ARP, ICMP, IGMP
TCP/IP Network Interface Layer (Layer 1) - ANSWER: =OSI layers: data link and
physical
includes ethernet
Hub - ANSWER: OSI layer 1; connects the router to the network, takes the data
packers from the router, and sends them all to devices connected to the network
(ex: usb hub)
Modem - ANSWER: OSI layer 1; allows computer to transport digital info over analog
lines, such as phone or cable lines.
Repeater - ANSWER: OSI layer 1; a device used to strengthen, replicate, and
regenerate signals that are weakened (ex: because of distance) during transmission.
Switch - ANSWER: OSI layer 2; used to connect devices in a specific network and
allows them to communicate efficiently within the network. It is a more complex
vfersion of a hub. They can add security measures and function more inteligently,
sending traffic directly from the sender to the receiver without the other devices
being aware of the communication.
Bridge - ANSWER: OSI layer 2; similar to a router in that it connects two or more
networks. The difference is that a router analyzes data packets to determine wher to
send the packets next, whereas a bridge simply forwards the data to the next
network without analysis.
Router - ANSWER: OSI layer 3; a point of connection between two or more networks
that forward data packets between the networks. To have internet in your home you
have to have a router that connects the internet to the network of your home.
Cat3 UTP - ANSWER: supports up to 10 mbps for up to 100 meters and is commonly
used for phone lines.
Cat4 UTP - ANSWER: supports 16 Mbps for up to 100 meters and is not commonly
used today.
Cat5 UTP - ANSWER: used in ethernet LANs containing two twisted pairs allowing for
up to 100 mbps up to 100 meters between the device and the switch, hub or router.
Replaced mostly by Cat5e.
Cat5e UTP - ANSWER: doubles the number of twisted pairs to four for up to 1 gbps
over up to 100 meters.
Cat6 UTP - ANSWER: also used in ethernet LANs and data centers; made up of four
tightly woven twisted pairs (more twists per linear foot) and supports 1 gbps for up
to 100 meters or 10 gbps for up to 55 meters.
