WGU D412 Help Desk Ticket Analysis - Comprehensive Practice Exam |
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Exam Overview
Question 1
What are the 7 layers of the OSI model in correct order from top to bottom?
A. Physical, Data Link, Network, Transport, Session, Presentation, Application
B. Application, Presentation, Session, Transport, Network, Data Link, Physical
C. Application, Transport, Network, Data Link, Physical, Session, Presentation
D. Physical, Data Link, Network, Transport, Session, Presentation, Application
Correct answersB
Rationale: The OSI model layers from top (Layer 7) to bottom (Layer 1) are: Application, Presentation,
Session, Transport, Network, Data Link, Physical. A helpful mnemonic from top to bottom is "All People
Seem To Need Data Processing" .
Question 2
Which layer of the OSI model is responsible for routing packets between networks?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Transport Layer
Correct answersC
,Rationale: The Network Layer (Layer 3) is responsible for logical addressing (IP addresses) and routing
packets between different networks. Routers operate at this layer .
Question 3
Which OSI layer is responsible for reliable data transport and error recovery?
A. Session Layer
B. Presentation Layer
C. Transport Layer
D. Application Layer
Correct answersC
Rationale: The Transport Layer (Layer 4) provides reliable data transport, error recovery, flow control,
and segmentation/reassembly. TCP operates at this layer, providing connection-oriented, reliable
communication .
Question 4
Which OSI layer manages communication sessions between applications?
A. Application Layer
B. Presentation Layer
C. Session Layer
D. Transport Layer
Correct answersC
Rationale: The Session Layer (Layer 5) establishes, manages, and terminates communication sessions
between applications. It handles session checkpoints and recovery .
,Question 5
Which OSI layer includes the physical port number in its addressing?
A. Data Link Layer (MAC addresses)
B. Network Layer (IP addresses)
C. Transport Layer (port numbers)
D. Application Layer
Correct answersC
Rationale: The Transport Layer uses port numbers to identify specific applications or services. Port
numbers range from 0-65535 and are used by TCP and UDP to direct traffic to the correct process .
Question 6
The MAC table and ARP table are associated with which OSI layers?
A. MAC table - Network Layer; ARP table - Data Link Layer
B. MAC table - Data Link Layer; ARP table - Network Layer
C. Both operate at the Physical Layer
D. Both operate at the Transport Layer
Correct answersB
Rationale: The MAC table (CAM table) is used by switches at Layer 2 (Data Link Layer) to forward frames
based on MAC addresses. The ARP table maps IP addresses (Layer 3) to MAC addresses (Layer 2),
bridging the Network and Data Link layers .
Question 7
Which table includes the physical port number for forwarding decisions?
, A. MAC table only
B. ARP table only
C. Both MAC and ARP tables
D. Routing table
Correct answersA
Rationale: The MAC table (CAM table) in a switch maps MAC addresses to specific physical switch ports,
allowing the switch to forward frames only out the correct port rather than flooding all ports .
Question 8
Which Layer 4 protocol does DHCP use?
A. TCP only
B. UDP only
C. Both TCP and UDP
D. Neither
Correct answersB
Rationale: DHCP (Dynamic Host Configuration Protocol) uses UDP as its transport protocol. DHCP clients
send messages to UDP port 68, and DHCP servers respond from UDP port 67 .
Question 9
Which ports does DHCP use for client-server communication?
A. TCP port 80 and 443
B. UDP ports 67 (server) and 68 (client)
C. TCP ports 67 and 68
Complete Study Guide | Verified Questions & Answers | Latest Updated
Version | Exam Prep | 100% Pass Success Resource | Instant Download
Exam Overview
Question 1
What are the 7 layers of the OSI model in correct order from top to bottom?
A. Physical, Data Link, Network, Transport, Session, Presentation, Application
B. Application, Presentation, Session, Transport, Network, Data Link, Physical
C. Application, Transport, Network, Data Link, Physical, Session, Presentation
D. Physical, Data Link, Network, Transport, Session, Presentation, Application
Correct answersB
Rationale: The OSI model layers from top (Layer 7) to bottom (Layer 1) are: Application, Presentation,
Session, Transport, Network, Data Link, Physical. A helpful mnemonic from top to bottom is "All People
Seem To Need Data Processing" .
Question 2
Which layer of the OSI model is responsible for routing packets between networks?
A. Physical Layer
B. Data Link Layer
C. Network Layer
D. Transport Layer
Correct answersC
,Rationale: The Network Layer (Layer 3) is responsible for logical addressing (IP addresses) and routing
packets between different networks. Routers operate at this layer .
Question 3
Which OSI layer is responsible for reliable data transport and error recovery?
A. Session Layer
B. Presentation Layer
C. Transport Layer
D. Application Layer
Correct answersC
Rationale: The Transport Layer (Layer 4) provides reliable data transport, error recovery, flow control,
and segmentation/reassembly. TCP operates at this layer, providing connection-oriented, reliable
communication .
Question 4
Which OSI layer manages communication sessions between applications?
A. Application Layer
B. Presentation Layer
C. Session Layer
D. Transport Layer
Correct answersC
Rationale: The Session Layer (Layer 5) establishes, manages, and terminates communication sessions
between applications. It handles session checkpoints and recovery .
,Question 5
Which OSI layer includes the physical port number in its addressing?
A. Data Link Layer (MAC addresses)
B. Network Layer (IP addresses)
C. Transport Layer (port numbers)
D. Application Layer
Correct answersC
Rationale: The Transport Layer uses port numbers to identify specific applications or services. Port
numbers range from 0-65535 and are used by TCP and UDP to direct traffic to the correct process .
Question 6
The MAC table and ARP table are associated with which OSI layers?
A. MAC table - Network Layer; ARP table - Data Link Layer
B. MAC table - Data Link Layer; ARP table - Network Layer
C. Both operate at the Physical Layer
D. Both operate at the Transport Layer
Correct answersB
Rationale: The MAC table (CAM table) is used by switches at Layer 2 (Data Link Layer) to forward frames
based on MAC addresses. The ARP table maps IP addresses (Layer 3) to MAC addresses (Layer 2),
bridging the Network and Data Link layers .
Question 7
Which table includes the physical port number for forwarding decisions?
, A. MAC table only
B. ARP table only
C. Both MAC and ARP tables
D. Routing table
Correct answersA
Rationale: The MAC table (CAM table) in a switch maps MAC addresses to specific physical switch ports,
allowing the switch to forward frames only out the correct port rather than flooding all ports .
Question 8
Which Layer 4 protocol does DHCP use?
A. TCP only
B. UDP only
C. Both TCP and UDP
D. Neither
Correct answersB
Rationale: DHCP (Dynamic Host Configuration Protocol) uses UDP as its transport protocol. DHCP clients
send messages to UDP port 68, and DHCP servers respond from UDP port 67 .
Question 9
Which ports does DHCP use for client-server communication?
A. TCP port 80 and 443
B. UDP ports 67 (server) and 68 (client)
C. TCP ports 67 and 68
