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WGU Pre assessment D315 Exam Questions and Complete Solutions Graded A+
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WGU Pre assessment D315 Exam Questions and Complete Solutions Graded A+
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WGU Pre assessmentD315 Exam Questions
and Complete Solutions
Graded A+
What is the TCP/IP layer that includes the Hypertext Transfer Protocol (HTTP)?
1) Application
2) Physical or network access
3) Network or internet
4) Transport - Answer: 1) Application
Which layer of the TCP/IP model includes the Post Office Protocol (POP)?
1) Application
2) Physical or network access
3) Network or internet
4) Transport - Answer: 1) Application
Which layer of the TCP/IP model includes the Internet Message Access Protocol (IMAP)?
1) Application
2) Physical or network access
3) Network or internet
4) Transport - Answer: 1) Application
,The TCP/IP model - Answer: 1) Network Interface Layer (or Link Layer)
Function: This layer combines the functions of the OSI model's Physical and Data Link layers. It is
responsible for the physical transmission of data over a network medium and handling the hardware
addressing and access control protocols that manage the data link between two directly connected
nodes.
2) Network Layer
Function: This layer corresponds to the Network layer in the OSI model. It is responsible for logical
addressing, routing, and delivering packets across networks. It ensures that data packets can travel
across multiple interconnected networks (internetworks).
3) Transport Layer
Function: This layer corresponds to the Transport layer in the OSI model. It is responsible for ensuring
reliable data transfer between devices, providing error recovery, and flow control. It can establish,
maintain, and terminate connections between applications.
4) Application Layer
Function: This layer combines the functions of the OSI model's Session, Presentation, and Application
layers. It provides various network services directly to user applications and is responsible for handling
high-level protocols, data representation, encoding, and session management.
TCP/IP Key Functions of the network interface layer - Answer: 1) Network Interface Layer (or Link Layer)
Physical Transmission: Converting data into signals appropriate for the transmission medium (e.g.,
electrical signals for cables, radio signals for wireless).
Data Framing: Packaging data into frames for transmission, including frame synchronization.
MAC Addressing: Handling hardware (MAC) addresses for identifying devices on the same local network.
Error Detection and Correction: Detecting and possibly correcting errors that occur in the physical
transmission of frames.
TCP/IP Key Functions of the Network layer - Answer: 2) Network Layer
IP Addressing: Assigning logical IP addresses to devices, which are used to identify and locate them on
the network.
,Routing: Determining the best path for data to travel from the source to the destination. This involves
forwarding packets through intermediate routers.
Packet Handling: Fragmenting and reassembling packets if they are too large for the network's
maximum transmission unit (MTU).
Protocols: The primary protocol at this layer is the Internet Protocol (IP), including IPv4 and IPv6. Other
protocols include ICMP (Internet Control Message Protocol) and ARP (Address Resolution Protocol).
TCP/IP Key Functions of the Transport Layer - Answer: 3) Transport Layer
Segmentation and Reassembly: Breaking down large messages into smaller segments for transmission
and reassembling them at the destination.
Connection Management: Establishing, maintaining, and terminating communication sessions between
applications.
Error Detection and Correction: Ensuring data integrity through checksums and acknowledgments.
Flow Control: Managing data flow to prevent congestion and ensure efficient use of network resources.
Protocols: The primary protocols at this layer are TCP (Transmission Control Protocol), which provides
reliable, connection-oriented communication, and UDP (User Datagram Protocol), which provides
connectionless communication with less overhead.
TCP/IP Key Functions of the Application Layer - Answer: 4) Application Layer
Application Services: Providing network services such as email, file transfer, web browsing, and remote
login.
Data Representation: Translating data between application formats and network formats, including data
encryption and compression.
Session Management: Establishing, maintaining, and terminating application sessions.
Protocols: Examples include HTTP (HyperText Transfer Protocol), FTP (File Transfer Protocol), SMTP
(Simple Mail Transfer Protocol), and DNS (Domain Name System).
Which OSI model layer is responsible for breaking data into packets?
1) Physical
2) Application
3) Session
, 4) Transport - Answer: 4) Transport
What is the layer of the OSI model that is responsible for properly transmitting data packets?
1) Presentation
2) Transport
3) Session
4) Physical - Answer: 2) Transport
What is the OSI model layer that includes the IPX?
1) Transport
2) Application
3) Session
4) Network - Answer: 4) Network
What is the OSI model layer that includes the UDP?
1) Network
2) Session
3) Application
4) Transport - Answer: 4) Transport
Transport Layer (Layer 4): This layer is responsible for providing end-to-end communication services for
applications. It manages the delivery and error-checking of data packets. The Transport layer includes
protocols like TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). UDP is a
connectionless protocol that allows for the sending of datagrams without establishing a connection,
making it suitable for applications that require fast, efficient transmission such as streaming and online
gaming.
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