WGU C172 Network and Security –
Foundations Exam Questions Complete
Latest 2025/2026 with Correct Answers and
Rationales GRADED A+
Terms in this set (275) Original
The set of rules established for users to
protocol
exchange information
The network architecture used to interconnect
topology
the networking equipment
Each station connected to the network is
deterministic network ensured access for transmission of its messages
at regular or fixed time intervals
, The computers share the media (coaxial cable)
bus topology
for data transmission
ThinNet The coaxial cable used in a bus network.
Twisted-pair cables connect the devices to a
star topology
central hub or switch
A multiport repeater device used at the center
hub
of a star topology
The data it receives is broadcast and seen by all
multiport repeater
devices connected to its ports. A hub.
Transmission of data by a hub to all devices
broadcast
connected to its ports
Device used at the center of a star topology
switch that forwards a frame it receives directly out
the port associated with its destination address
All networking devices are directly connected
mesh topology
to each other, allows for full redundancy
,OSI model The seven layers describing network functions
Provides the electrical and mechanical
Physical layer connection to the network (cabling, NICs). 1st
OSI layer
Handles error recovery, flow control
Data link layer (synchronization), and sequencing (MAC,
Ethernet). 2nd OSI layer
Accepts outgoing messages and combines
messages or segments into packets, adding a
Network layer
header that includes routing information (IP,
IPX). 3rd OSI layer
Concerned with message integrity between
Transport layer source and destination (TCP, UDP). 4th OSI
layer
Provides the control functions necessary to
Session layer establish, manage, and terminate the
connections (NSF, SQL). 5th OSI layer
Accepts and structures the messages for the
Presentation layer
application (ASCII, JPEG). 6th OSI layer
Interacts with application programs that
incorporate a communication component such
Application layer
as your Internet browser and email (HTTP,
FTP, SMTP). 7th OSI layer
, Is the connection to the machine down? (layer
1)
3 basic steps to isolate network problem Is the network down? (layer 3)
Is a service on a specific machine down? (layer
7)
The Ethernet LAN media-access method,
CSMA/CD carrier sense multiple access with collision
detection
LAN protocol created in 1972 and standardized
Ethernet
in 1980 using CSMA/CD.
Contains the header, data, and trailer (the
Frame padding and 4-byte CRC frame check
sequence)
Consists of the preamble, start frame delimiter,
Frame header destination and source addresses, and
length/type field
64 bytes Minimum length of an Ethernet frame
1518 bytes Maximum length of an Ethernet frame
A unique 6-byte/48-bit address assigned by the
MAC address vendor of the network interface card displayed
in 12 hex digits
Foundations Exam Questions Complete
Latest 2025/2026 with Correct Answers and
Rationales GRADED A+
Terms in this set (275) Original
The set of rules established for users to
protocol
exchange information
The network architecture used to interconnect
topology
the networking equipment
Each station connected to the network is
deterministic network ensured access for transmission of its messages
at regular or fixed time intervals
, The computers share the media (coaxial cable)
bus topology
for data transmission
ThinNet The coaxial cable used in a bus network.
Twisted-pair cables connect the devices to a
star topology
central hub or switch
A multiport repeater device used at the center
hub
of a star topology
The data it receives is broadcast and seen by all
multiport repeater
devices connected to its ports. A hub.
Transmission of data by a hub to all devices
broadcast
connected to its ports
Device used at the center of a star topology
switch that forwards a frame it receives directly out
the port associated with its destination address
All networking devices are directly connected
mesh topology
to each other, allows for full redundancy
,OSI model The seven layers describing network functions
Provides the electrical and mechanical
Physical layer connection to the network (cabling, NICs). 1st
OSI layer
Handles error recovery, flow control
Data link layer (synchronization), and sequencing (MAC,
Ethernet). 2nd OSI layer
Accepts outgoing messages and combines
messages or segments into packets, adding a
Network layer
header that includes routing information (IP,
IPX). 3rd OSI layer
Concerned with message integrity between
Transport layer source and destination (TCP, UDP). 4th OSI
layer
Provides the control functions necessary to
Session layer establish, manage, and terminate the
connections (NSF, SQL). 5th OSI layer
Accepts and structures the messages for the
Presentation layer
application (ASCII, JPEG). 6th OSI layer
Interacts with application programs that
incorporate a communication component such
Application layer
as your Internet browser and email (HTTP,
FTP, SMTP). 7th OSI layer
, Is the connection to the machine down? (layer
1)
3 basic steps to isolate network problem Is the network down? (layer 3)
Is a service on a specific machine down? (layer
7)
The Ethernet LAN media-access method,
CSMA/CD carrier sense multiple access with collision
detection
LAN protocol created in 1972 and standardized
Ethernet
in 1980 using CSMA/CD.
Contains the header, data, and trailer (the
Frame padding and 4-byte CRC frame check
sequence)
Consists of the preamble, start frame delimiter,
Frame header destination and source addresses, and
length/type field
64 bytes Minimum length of an Ethernet frame
1518 bytes Maximum length of an Ethernet frame
A unique 6-byte/48-bit address assigned by the
MAC address vendor of the network interface card displayed
in 12 hex digits
