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WGU D315 NETWORK AND SECURITY FOUNDATIONS EXAM ACTUAL EXAM-STUDY GUIDE COMPLETE 250 QUESTIONS AND CORRECT DETAILED VERIFIED SOLUTIONS LATEST | click on ALSO AVAILABLE IN PACKAGE DEAL. You'll get more for less!"$20.99
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WGU D315 NETWORK AND SECURITY FOUNDATIONS
EXAM ACTUAL EXAM-STUDY GUIDE COMPLETE 250
QUESTIONS AND CORRECT DETAILED VERIFIED
SOLUTIONS LATEST 2024-2025
WGU D315 NETWORK AND SECURITY FOUNDATIONS EXAM
TCP/IP
Transmission Control Protocol/Internet Protocol
Application Layer
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
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
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
This layer establishes how data should be physically sent through the network.
OSI Model
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Open Systems Interconnection Model
Physical Layer (Layer 1)
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)
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)
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)
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)
This layer is responsible for connection establishment, session maintenance, and
authentication.
Presentation Layer (Layer 6)
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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)
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}
-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}
-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}
-Interconnect two or more networks
-Operate at the border of your network
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-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}
-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
-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
-A security hardware appliance or software application that protects a computer or network
from unwanted intrusion
-Blocks unwanted connections from untrusted networks and can block basic network attacks
Modem {Physical and Data link Layer}
-Connects a LAN to an internet service provider
-Converts digital signals into analog signals and vice versa
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