WGU D315 NETWORK AND SECURITY - FOUNDATIONS
OBJECTIVE ASSESSMENT PRE STUDY EXAM 2024/2025/GRADED
A+
TCP/IP (correct answer)model that is a common set of protocol standards that permits the appropriate
transmission of data; used for practical application when locating specific protocol
TCP/IP layers (correct answer)application, transport, network, network interface
OSI (correct answer)model that enables transmission of data among hosts on a network; widely used in
network documentation and discussions
OSI layers (correct answer)Application, Presentation, Session, Transport, Network, Data Link, Physical
Open Systems Interconnection (OSI) (correct answer)OSI acronym
TCP and OSI (correct answer)set of procedures that sends data from one host to another. Can be done
over the internet, network, or any form of communication
TCP Network Interface Layer (correct answer)Physical cabling and wireless spectrum
OSI - Physical Layer (correct answer)cables and connectors; establishes how a signal is transmitted via
wires or airwaves; responsible for the physical connections of the devices in a network; use hubs,
repeaters, modem devices and cabling
OSI - Data link layer (correct answer)contains network card and Media Access Control (MAC) address;
responsible for error-free delivery of data to the receiving device or node; switches, bridges, or
wireless/wired network cards
Network Layer (TCP and OSI) (correct answer)Internet Protocol and Internet Control Message Protocol
(ICMP); define one protocol versus another for connecting networks
,Transport Layer (TCP and OSI) (correct answer)ensures data is transferred to the correct application;
Transmission Control Protocol (TCP) or User Diagram Protocol (UDP)
Transmission Control Protocol (TCP) (correct answer)type of transport layer; verifies data and resends if
not delivered
User Diagram Protocol (UDP) (correct answer)type of transport layer; unreliable to the extent that it
does not guarantee redelivery of the data; preferred in audio streaming
TCP - Application Layer (correct answer)HTTP for a web broswer; SMTP for email; DNS; Secure Shell
(SSH); network time protocol (NTP); communication protocol between nodes
OSI - Session Layer (correct answer)establishes the session and ensures things are working correctly end-
to-end
OSI - Presentation Layer (correct answer)takes care of data encryption; translating data from the
application layer into format required to transmit data;
OSI - Application Layer (correct answer)HTTP; DNS; File transfer protocol (FTP); responsible for network
application; production of data to be transferred over the network
OSI layers by number (correct answer)Physical 1; Data Link 2; Network 3; Transport 4; Session 5;
Presentation 6; Application 7
TCP Transport Layer (correct answer)responsible for end-to-end transport data; TCP and UDP
TCP Network Layer (correct answer)logical transmission protocols for the whole network; IP, Internet
Control Message Protocol (ICMP), address resolution protocol (ARP)
TCP Network Interface Layer (correct answer)establishes how the data should be physically sent through
the network
, OSI - Network Layer (correct answer)responsible for the transmission of data between hosts in different
networks as well as routing data packets; use routers and some switches
OSI - Transport Layer (correct answer)receives services from network layer and provides services to the
application layer; responsible for reliable delivery of data; segments and reassembles data in the correct
order for it to be sent to the receiving device; handle reliable delivery of data that are lost or corrupted
(TCP does this); heart of OSI
Switch (correct answer)found with OSI data link; standalone or integrated with other devices; keeps
traffic between the source and destination ports from interfering with other devices on the network;
Router (correct answer)found with OSI network layer; connect home network to the internet; connect
web server to database server;
Firewalls (correct answer)found in OSI layers data link, network, transport, session, and application;
defines what traffic should go between two networks; can be software that runs in virtual machine or
physical server like hardware
Firewall Layer 4 (correct answer)operates the network and transport layers;
Firewall Layer 7 (correct answer)operates at session, presentation, and application layers; decrypt and
analyze the content flowing through
Modem (correct answer)A device necessary for sending and receiving data. Allows computers to
transport digital information over analog lines, such as phone or cable lines; DSL or satelite; found in
data link and physical
Repeater (correct answer)A device used to strengthen, replicate, and regenerate signals that are
weakened during transmission; range extender is a form that takes distored Wi-Fi signal and transmits it
to the formerly dead zone in large homes
Hub (correct answer)device that connects the router to the network; takes the data packets from the
router and sends them to all devices connected on the network (e.g. USB hub)
OBJECTIVE ASSESSMENT PRE STUDY EXAM 2024/2025/GRADED
A+
TCP/IP (correct answer)model that is a common set of protocol standards that permits the appropriate
transmission of data; used for practical application when locating specific protocol
TCP/IP layers (correct answer)application, transport, network, network interface
OSI (correct answer)model that enables transmission of data among hosts on a network; widely used in
network documentation and discussions
OSI layers (correct answer)Application, Presentation, Session, Transport, Network, Data Link, Physical
Open Systems Interconnection (OSI) (correct answer)OSI acronym
TCP and OSI (correct answer)set of procedures that sends data from one host to another. Can be done
over the internet, network, or any form of communication
TCP Network Interface Layer (correct answer)Physical cabling and wireless spectrum
OSI - Physical Layer (correct answer)cables and connectors; establishes how a signal is transmitted via
wires or airwaves; responsible for the physical connections of the devices in a network; use hubs,
repeaters, modem devices and cabling
OSI - Data link layer (correct answer)contains network card and Media Access Control (MAC) address;
responsible for error-free delivery of data to the receiving device or node; switches, bridges, or
wireless/wired network cards
Network Layer (TCP and OSI) (correct answer)Internet Protocol and Internet Control Message Protocol
(ICMP); define one protocol versus another for connecting networks
,Transport Layer (TCP and OSI) (correct answer)ensures data is transferred to the correct application;
Transmission Control Protocol (TCP) or User Diagram Protocol (UDP)
Transmission Control Protocol (TCP) (correct answer)type of transport layer; verifies data and resends if
not delivered
User Diagram Protocol (UDP) (correct answer)type of transport layer; unreliable to the extent that it
does not guarantee redelivery of the data; preferred in audio streaming
TCP - Application Layer (correct answer)HTTP for a web broswer; SMTP for email; DNS; Secure Shell
(SSH); network time protocol (NTP); communication protocol between nodes
OSI - Session Layer (correct answer)establishes the session and ensures things are working correctly end-
to-end
OSI - Presentation Layer (correct answer)takes care of data encryption; translating data from the
application layer into format required to transmit data;
OSI - Application Layer (correct answer)HTTP; DNS; File transfer protocol (FTP); responsible for network
application; production of data to be transferred over the network
OSI layers by number (correct answer)Physical 1; Data Link 2; Network 3; Transport 4; Session 5;
Presentation 6; Application 7
TCP Transport Layer (correct answer)responsible for end-to-end transport data; TCP and UDP
TCP Network Layer (correct answer)logical transmission protocols for the whole network; IP, Internet
Control Message Protocol (ICMP), address resolution protocol (ARP)
TCP Network Interface Layer (correct answer)establishes how the data should be physically sent through
the network
, OSI - Network Layer (correct answer)responsible for the transmission of data between hosts in different
networks as well as routing data packets; use routers and some switches
OSI - Transport Layer (correct answer)receives services from network layer and provides services to the
application layer; responsible for reliable delivery of data; segments and reassembles data in the correct
order for it to be sent to the receiving device; handle reliable delivery of data that are lost or corrupted
(TCP does this); heart of OSI
Switch (correct answer)found with OSI data link; standalone or integrated with other devices; keeps
traffic between the source and destination ports from interfering with other devices on the network;
Router (correct answer)found with OSI network layer; connect home network to the internet; connect
web server to database server;
Firewalls (correct answer)found in OSI layers data link, network, transport, session, and application;
defines what traffic should go between two networks; can be software that runs in virtual machine or
physical server like hardware
Firewall Layer 4 (correct answer)operates the network and transport layers;
Firewall Layer 7 (correct answer)operates at session, presentation, and application layers; decrypt and
analyze the content flowing through
Modem (correct answer)A device necessary for sending and receiving data. Allows computers to
transport digital information over analog lines, such as phone or cable lines; DSL or satelite; found in
data link and physical
Repeater (correct answer)A device used to strengthen, replicate, and regenerate signals that are
weakened during transmission; range extender is a form that takes distored Wi-Fi signal and transmits it
to the formerly dead zone in large homes
Hub (correct answer)device that connects the router to the network; takes the data packets from the
router and sends them to all devices connected on the network (e.g. USB hub)
