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Network and Security- Foundations- D315 Test Questions and Complete Solutions Graded A+
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Network and Security- Foundations- D315 Test Questions and Complete Solutions Graded A+
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Network and Security-Foundations- D315 Test
Questions and Complete
Solutions Graded A+
TCP/IP - Answer: Transmission Control Protocol/Internet Protocol
Application Layer - Answer: This layer is responsible for the communication protocols between nodes.
The protocols in this layer include hypertext transfer protocol (HTTP and HTTPS), Secure Shell (SSH), and
network time protocol (NTP), among many others.
Transport Layer - Answer: This layer is responsible for the end-to-end transport of data. The protocols
that live in this layer are transmission control protocol (TCP) and user datagram protocol (UDP).
Network Layer - Answer: This layer defines the logical transmission protocols for the whole network. The
main protocols that live in this layer are internet protocol (IP), internet control message protocol (ICMP),
and address resolution protocol (ARP).
Network interface Layer - Answer: This layer establishes how data should be physically sent through the
network.
OSI Model - Answer: Open Systems Interconnection Model
Physical Layer (Layer 1) - Answer: This layer is 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 (Layer 2) - Answer: This layer is 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 (Layer 3) - Answer: This layer is 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 (layer 4) - Answer: In this layer protocols ensure that data are transferred from point A
to point B reliably and without errors. this layer services include flow control, acknowledgment, error
correction, segmentation, reassembly, and sequencing.
Session Layer (Layer 5) - Answer: This layer is responsible for connection establishment, session
maintenance, and authentication.
Presentation Layer (Layer 6) - Answer: This layer is 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 (Layer 7) - Answer: This layer is responsible for network applications (like HTTP or FTP)
and their production of data to be transferred over the network.
Hub {Physical Layer} - Answer: -The simplest device used on an Ethernet network for connecting devices
to each other
-split the bandwidth of a connection among all the computers connected to it
- do not perform any packet filtering or addressing functions but instead broadcast data to all computers
connected to it
Switch {Data and Network Layer} - Answer: -Provides connectivity to devices in a local network
, -Creates a dedicated full-speed connection between two computers that are communicating with each
other
- makes use of the MAC address to deliver the message to the right destination
Router{Network Layer} - Answer: -Interconnect two or more networks
-Operate at the border of your network
-Stores information about the systems that are connected to it and where to send requests when the
destination is unknown
-Works at the network layer of the OSI model
Wireless Access point {WAP} - Answer: -Extends a wired network to wireless connections
-Involves the IEEE 802.11 group of standards that defines wireless LAN's {WLAN's}
-Central connecting point for computers equipped with wireless network adapters
- identifies each computer by its MAC address
Patch Panel - Answer: -A box designed as a junction point for twisted pair (TP) cable and fiber cable used
in networks.
-First step in organizing your cables
Firewall - Answer: -A security hardware appliance or software application that protects a computer or
network from unwanted intrusion
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