Wgu_C172_Network_And_Security_Foundations_Exam_Script_2026_Test.pdf

WGU C172 NETWORK AND SECURITY
FOUNDATIONS EXAM SCRIPT TEST

◉ Network Interface Layer (TCP/IP). Answer: TCP/IP model layer
that establishes how data should be physically sent through the
network.


Ethernet




In conjunction with layers 1 PHYSICAL and 2 DATA LINK


◉ Network Layer (TCP/IP). Answer: TCP/IP model layer that defines
the logical transmission protocols for the whole network.


- IP ( Internet Protocol)
- ARP ( Address Resolution Protocol)
- ICMP (Internet Contol Message Protocol)
- IGMP


in conjunction with layer 3 NETWORK of the OSI Model.

,◉ Transport Layer (TCP/IP). Answer: TCP/IP model layer that s
responsible for the end-to-end transport of data. The protocols that
live in this layer are.


- TCP (Transmission Control Protocol)
- UDP (User Datagram Protocol)


In conjunction with layer 4 TRANSPORT of the OSI Model


◉ Application Layer (TCP/IP). Answer: TCP/IP model layer that is
responsible for the communication protocols between nodes. The
protocols in this layer include.


- HTTP (Hyper Text Transfer Protocol)
- SSH (Secure Shell)
- FTTP
- Telnet
- NTP (Network Time Protocol)
- DHCP
- PING

,In conjunction with Layers 5 SESSION, 6 PRESENTATION, AND 7
APPLICATION of the OSI model.


◉ Physical Layer (OSI model). Answer: Layer 1 of the OSI Model
responsible for the physical connections of the devices in the
network. This layer is implemented through the use of devices such
as hubs, repeaters, modem devices, and physical cabling.


◉ Data Link Layer (OSI Model). Answer: Layer 2 of the OSI Model
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.


◉ Network Layer (OSI Model). Answer: Layer 3 of the OSI Model
responsible for the transmission of data between hosts in different
networks as well as routing of data packets. This layer is
implemented through the use of devices such as routers and some
switches.


◉ Transport Layer (OSI Model). Answer: Layer 4 of the OSI Model
provides services to the application layer and receives services from
the network layer and 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 corrupted (for
example, TCP does this). This layer is often called the heart of OSI.

, ◉ Session Layer (OSI Model). Answer: Layer 5 of the OSI Model
responsible for connection establishment, session maintenance, and
authentication.


◉ Presentation Layer (OSI Model). Answer: Layer 6 of the OSI Model
responsible for translating data from the application layer into the
format required to transmit the data over the network as well as
encrypting the data for security if encryption is used.


◉ Application layer (OSI model). Answer: Layer 7 of the OSI Model
responsible for network applications (like HTTP or FTP) and their
production of data to be transferred over the network.


◉ Modem. Answer: A device that is necessary for sending and
receiving data. They allow computers to transport digital
information over analog lines such as phone or cable lines. The three
types of these devices include cable, DSL, and satellite.


They operate at Level 1 and 2 of the OSI Model


◉ Router. Answer: A device that serves as the point connection
between two or more networks that forwards data packets between
the networks.