WGU D413 OBJECTIVE ASSESSMENT FINAL
EXAM WITH 350 + QUESTIONS AND ANSWERS
TELECOMMUNICATIONS AND WIRELESS
COMMUNICATIONS
LATEST 2026 ACTUAL EXAM TEST BANK
1. At which layer of the OSI model does a switch primarily operate when
forwarding frames based on MAC addresses?
A. Physical
B. Data Link
C. Network
D. Transport
Correct Answer💜💜: B
Rationale: Switches operate at Layer 2 (Data Link) because they make forwarding
decisions based on MAC addresses. Hubs operate at Layer 1, and routers operate
at Layer 3 .
2. Which layer of the OSI model is responsible for establishing, managing, and
terminating sessions between applications?
A. Transport
B. Session
C. Presentation
,D. Application
Correct Answer💜💜: B
Rationale: The Session layer (Layer 5) sets up, coordinates, and terminates
conversations, exchanges, and dialogues between applications at each end .
3. Which device separates collision domains but not broadcast domains?
A. Hub
B. Repeater
C. Switch
D. Router
Correct Answer💜💜: C
Rationale: Switches create separate collision domains per port. However, all ports
on a switch belong to the same broadcast domain unless Virtual LANs (VLANs) are
configured .
4. Which protocol is used to resolve an IPv4 address to a MAC address?
A. DNS
B. DHCP
C. ARP
D. ICMP
Correct Answer💜💜: C
Rationale: Address Resolution Protocol (ARP) is used to map a known IP address
to its corresponding MAC address on a local network .
5. What is the purpose of a subnet mask?
A. To encrypt data packets
B. To define which portion of an IP address is the network and which is the host
,C. To assign a MAC address to a device
D. To monitor network traffic flow
Correct Answer💜💜: B
Rationale: A subnet mask is a 32-bit number that masks an IP address and divides
it into the network address and host address, enabling proper routing .
6. Which protocol provides automated assignment of IP addresses, subnet
masks, and default gateways?
A. DNS
B. ARP
C. DHCP
D. SNMP
Correct Answer💜💜: C
Rationale: Dynamic Host Configuration Protocol (DHCP) automates the
assignment of IP addressing information to clients on a network .
7. What does the "100" represent in the Ethernet standard 100BASE-T?
A. The maximum cable length in meters
B. The data rate in Mbps
C. The frequency in MHz
D. The impedance in ohms
Correct Answer💜💜: B
Rationale: In Ethernet standards (e.g., 10Base-T, 100Base-T, 1000Base-T), the
number before "BASE" indicates the data rate in Megabits per second (Mbps) .
8. Which topology is known for having a central connection point (hub or
switch) which makes it easy to troubleshoot but creates a single point of
, failure?
A. Bus
B. Ring
C. Mesh
D. Star
Correct Answer💜💜: D
Rationale: Star topology connects all devices to a central concentrator. This
centralization simplifies management but if the central device fails, the entire
network segment goes down .
9. A network administrator needs to connect a router to a switch. Which type of
UTP cable should be used?
A. Crossover
B. Rollover
C. Straight-through
D. Loopback
Correct Answer💜💜: C
Rationale: Straight-through cables connect dissimilar devices (e.g., router to
switch, PC to switch). Modern interfaces use Auto-MDIX to correct pin
connections automatically .
10. Which of the following is a valid IPv6 address compression technique for the
address 2001:0db8:0000:0000:0000:ff00:0042:8329?
A. 2001:db8::ff00:42:8329
B. 2001:db8:0:0:0:ff00:42:8329
C. 2001:db8:0:0:0:ff00:0042:8329
EXAM WITH 350 + QUESTIONS AND ANSWERS
TELECOMMUNICATIONS AND WIRELESS
COMMUNICATIONS
LATEST 2026 ACTUAL EXAM TEST BANK
1. At which layer of the OSI model does a switch primarily operate when
forwarding frames based on MAC addresses?
A. Physical
B. Data Link
C. Network
D. Transport
Correct Answer💜💜: B
Rationale: Switches operate at Layer 2 (Data Link) because they make forwarding
decisions based on MAC addresses. Hubs operate at Layer 1, and routers operate
at Layer 3 .
2. Which layer of the OSI model is responsible for establishing, managing, and
terminating sessions between applications?
A. Transport
B. Session
C. Presentation
,D. Application
Correct Answer💜💜: B
Rationale: The Session layer (Layer 5) sets up, coordinates, and terminates
conversations, exchanges, and dialogues between applications at each end .
3. Which device separates collision domains but not broadcast domains?
A. Hub
B. Repeater
C. Switch
D. Router
Correct Answer💜💜: C
Rationale: Switches create separate collision domains per port. However, all ports
on a switch belong to the same broadcast domain unless Virtual LANs (VLANs) are
configured .
4. Which protocol is used to resolve an IPv4 address to a MAC address?
A. DNS
B. DHCP
C. ARP
D. ICMP
Correct Answer💜💜: C
Rationale: Address Resolution Protocol (ARP) is used to map a known IP address
to its corresponding MAC address on a local network .
5. What is the purpose of a subnet mask?
A. To encrypt data packets
B. To define which portion of an IP address is the network and which is the host
,C. To assign a MAC address to a device
D. To monitor network traffic flow
Correct Answer💜💜: B
Rationale: A subnet mask is a 32-bit number that masks an IP address and divides
it into the network address and host address, enabling proper routing .
6. Which protocol provides automated assignment of IP addresses, subnet
masks, and default gateways?
A. DNS
B. ARP
C. DHCP
D. SNMP
Correct Answer💜💜: C
Rationale: Dynamic Host Configuration Protocol (DHCP) automates the
assignment of IP addressing information to clients on a network .
7. What does the "100" represent in the Ethernet standard 100BASE-T?
A. The maximum cable length in meters
B. The data rate in Mbps
C. The frequency in MHz
D. The impedance in ohms
Correct Answer💜💜: B
Rationale: In Ethernet standards (e.g., 10Base-T, 100Base-T, 1000Base-T), the
number before "BASE" indicates the data rate in Megabits per second (Mbps) .
8. Which topology is known for having a central connection point (hub or
switch) which makes it easy to troubleshoot but creates a single point of
, failure?
A. Bus
B. Ring
C. Mesh
D. Star
Correct Answer💜💜: D
Rationale: Star topology connects all devices to a central concentrator. This
centralization simplifies management but if the central device fails, the entire
network segment goes down .
9. A network administrator needs to connect a router to a switch. Which type of
UTP cable should be used?
A. Crossover
B. Rollover
C. Straight-through
D. Loopback
Correct Answer💜💜: C
Rationale: Straight-through cables connect dissimilar devices (e.g., router to
switch, PC to switch). Modern interfaces use Auto-MDIX to correct pin
connections automatically .
10. Which of the following is a valid IPv6 address compression technique for the
address 2001:0db8:0000:0000:0000:ff00:0042:8329?
A. 2001:db8::ff00:42:8329
B. 2001:db8:0:0:0:ff00:42:8329
C. 2001:db8:0:0:0:ff00:0042:8329
