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Network and Security Foundations - D315 Exam Questions and Complete Solutions Graded A+
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Network and Security Foundations - D315 Exam Questions and Complete Solutions Graded A+
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Network and SecurityFoundations - D315
Exam Questions and
Complete Solutions
Graded A+
TCP/IP - 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 - Answer: application, transport, network, network interface
OSI - Answer: model that enables transmission of data among hosts on a network; widely used in
network documentation and discussions
OSI layers - Answer: Application, Presentation, Session, Transport, Network, Data Link, Physical
Open Systems Interconnection (OSI) - Answer: OSI acronym
TCP and OSI - 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 - Answer: Physical cabling and wireless spectrum
OSI - Physical Layer - 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 - 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) - Answer: Internet Protocol and Internet Control Message Protocol (ICMP);
define one protocol versus another for connecting networks
Transport Layer (TCP and OSI) - Answer: ensures data is transferred to the correct application;
Transmission Control Protocol (TCP) or User Diagram Protocol (UDP)
Transmission Control Protocol (TCP) - Answer: type of transport layer; verifies data and resends if not
delivered
User Diagram Protocol (UDP) - 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 - Answer: HTTP for a web broswer; SMTP for email; DNS; Secure Shell (SSH);
network time protocol (NTP); communication protocol between nodes
OSI - Session Layer - Answer: establishes the session and ensures things are working correctly end-to-
end
OSI - Presentation Layer - Answer: takes care of data encryption; translating data from the application
layer into format required to transmit data;
OSI - Application Layer - Answer: HTTP; DNS; File transfer protocol (FTP); responsible for network
application; production of data to be transferred over the network
OSI layers by number - Answer: Physical 1; Data Link 2; Network 3; Transport 4; Session 5; Presentation
6; Application 7
TCP Transport Layer - Answer: responsible for end-to-end transport data; TCP and UDP
, TCP Network Layer - Answer: logical transmission protocols for the whole network; IP, Internet Control
Message Protocol (ICMP), address resolution protocol (ARP)
TCP Network Interface Layer - Answer: establishes how the data should be physically sent through the
network
OSI - Network Layer - 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 - 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 - 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 - Answer: found with OSI network layer; connect home network to the internet; connect web
server to database server;
Firewalls - 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 - Answer: operates the network and transport layers;
Firewall Layer 7 - Answer: operates at session, presentation, and application layers; decrypt and analyze
the content flowing through
Modem - 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
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