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WGU C172 Network and Security -
Foundations Questions with Detailed Verified
Answers
protocol Ans: The set of rules established for users to exchange
information
topology Ans: The network architecture used to interconnect the
networking equipment
deterministic network Ans: Each station connected to the network is
ensured access for transmission of its messages at regular or fixed time
intervals
bus topology Ans: The computers share the media (coaxial cable) for
data transmission
ThinNet Ans: The coaxial cable used in a bus network.
star topology Ans: Twisted-pair cables connect the devices to a central
hub or switch
hub Ans: A multiport repeater device used at the center of a star
topology
multiport repeater Ans: The data it receives is broadcast and seen by
all devices connected to its ports. A hub.
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broadcast Ans: Transmission of data by a hub to all devices connected
to its ports
switch Ans: Device used at the center of a star topology that forwards a
frame it receives directly out the port associated with its destination
address
mesh topology Ans: All networking devices are directly connected to
each other, allows for full redundancy
OSI model Ans: The seven layers describing network functions
Physical layer Ans: Provides the electrical and mechanical connection to
the network (cabling, NICs). 1st OSI layer
Data link layer Ans: Handles error recovery, flow control
(synchronization), and sequencing (MAC, Ethernet). 2nd OSI layer
Network layer Ans: Accepts outgoing messages and combines
messages or segments into packets, adding a header that includes
routing information (IP, IPX). 3rd OSI layer
Transport layer Ans: Concerned with message integrity between source
and destination (TCP, UDP). 4th OSI layer
Session layer Ans: Provides the control functions necessary to
establish, manage, and terminate the connections (NSF, SQL). 5th OSI
layer
Presentation layer Ans: Accepts and structures the messages for the
application (ASCII, JPEG). 6th OSI layer
Application layer Ans: Interacts with application programs that
incorporate a communication component such as your Internet browser
and email (HTTP, FTP, SMTP). 7th OSI layer
3 basic steps to isolate network problem Ans: Is the connection to the
machine down? (layer 1)
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Is the network down? (layer 3)
Is a service on a specific machine down? (layer 7)
CSMA/CD Ans: The Ethernet LAN media-access method, carrier sense
multiple access with collision detection
Ethernet Ans: LAN protocol created in 1972 and standardized in 1980
using CSMA/CD.
Frame Ans: Contains the header, data, and trailer (the padding and 4-
byte CRC frame check sequence)
Frame header Ans: Consists of the preamble, start frame delimiter,
destination and source addresses, and length/type field
64 bytes Ans: Minimum length of an Ethernet frame
1518 bytes Ans: Maximum length of an Ethernet frame
MAC address Ans: A unique 6-byte/48-bit address assigned by the
vendor of the network interface card displayed in 12 hex digits
Organizationally unique identifier (OUI) Ans: The first 3 bytes of the
MAC address that identifies the manufacturer of the network hardware
ipconfig /all Ans: Enables the MAC address information to be displayed
from the command prompt
IANA Ans: The agency that assigns IP addresses to computer networks
IP address Ans: Unique 32-bit address that identifies on which network
the computer is located as well as differentiates the computer from all
other devices on the same network
Class A networks Ans: Governments, very large networks. Range from
0.0.0.0 to 126.255.255.255. Example: 44.x.x.x
WGU C172 Network and Security -
Foundations Questions with Detailed Verified
Answers
protocol Ans: The set of rules established for users to exchange
information
topology Ans: The network architecture used to interconnect the
networking equipment
deterministic network Ans: Each station connected to the network is
ensured access for transmission of its messages at regular or fixed time
intervals
bus topology Ans: The computers share the media (coaxial cable) for
data transmission
ThinNet Ans: The coaxial cable used in a bus network.
star topology Ans: Twisted-pair cables connect the devices to a central
hub or switch
hub Ans: A multiport repeater device used at the center of a star
topology
multiport repeater Ans: The data it receives is broadcast and seen by
all devices connected to its ports. A hub.
, Page | 2
broadcast Ans: Transmission of data by a hub to all devices connected
to its ports
switch Ans: Device used at the center of a star topology that forwards a
frame it receives directly out the port associated with its destination
address
mesh topology Ans: All networking devices are directly connected to
each other, allows for full redundancy
OSI model Ans: The seven layers describing network functions
Physical layer Ans: Provides the electrical and mechanical connection to
the network (cabling, NICs). 1st OSI layer
Data link layer Ans: Handles error recovery, flow control
(synchronization), and sequencing (MAC, Ethernet). 2nd OSI layer
Network layer Ans: Accepts outgoing messages and combines
messages or segments into packets, adding a header that includes
routing information (IP, IPX). 3rd OSI layer
Transport layer Ans: Concerned with message integrity between source
and destination (TCP, UDP). 4th OSI layer
Session layer Ans: Provides the control functions necessary to
establish, manage, and terminate the connections (NSF, SQL). 5th OSI
layer
Presentation layer Ans: Accepts and structures the messages for the
application (ASCII, JPEG). 6th OSI layer
Application layer Ans: Interacts with application programs that
incorporate a communication component such as your Internet browser
and email (HTTP, FTP, SMTP). 7th OSI layer
3 basic steps to isolate network problem Ans: Is the connection to the
machine down? (layer 1)
, Page | 3
Is the network down? (layer 3)
Is a service on a specific machine down? (layer 7)
CSMA/CD Ans: The Ethernet LAN media-access method, carrier sense
multiple access with collision detection
Ethernet Ans: LAN protocol created in 1972 and standardized in 1980
using CSMA/CD.
Frame Ans: Contains the header, data, and trailer (the padding and 4-
byte CRC frame check sequence)
Frame header Ans: Consists of the preamble, start frame delimiter,
destination and source addresses, and length/type field
64 bytes Ans: Minimum length of an Ethernet frame
1518 bytes Ans: Maximum length of an Ethernet frame
MAC address Ans: A unique 6-byte/48-bit address assigned by the
vendor of the network interface card displayed in 12 hex digits
Organizationally unique identifier (OUI) Ans: The first 3 bytes of the
MAC address that identifies the manufacturer of the network hardware
ipconfig /all Ans: Enables the MAC address information to be displayed
from the command prompt
IANA Ans: The agency that assigns IP addresses to computer networks
IP address Ans: Unique 32-bit address that identifies on which network
the computer is located as well as differentiates the computer from all
other devices on the same network
Class A networks Ans: Governments, very large networks. Range from
0.0.0.0 to 126.255.255.255. Example: 44.x.x.x
