1
CompTIA Network+ (N10-009)
Practice Exam 150
Advanced/Hard Multiple-Choice
Questions with Answers and
Rationales a well detailed one
written and graded
A+ upgraded
, 2
Domain 1: Networking Concepts (23%)
Question 1
A network administrator is designing a new data center network and must choose a topology
that provides the highest level of redundancy while minimizing single points of failure. The
design requires that every switch connects to at least two other switches, and traffic can take
multiple paths between any two endpoints. Which of the following topologies BEST meets these
requirements?
A. Star topology
B. Ring topology
C. Full mesh topology
D. Bus topology
-” detailed answer 100 % correct :-”C
Rationale: A full mesh topology provides the highest redundancy because every device
connects to every other device, eliminating single points of failure. Star topology has a single
point of failure at the central hub/switch. Ring topology provides redundancy only if configured
with dual rings. Bus topology has no redundancy and a single cable failure brings down the
entire segment.
Question 2
A network engineer needs to interconnect two geographically separated data centers located 85
kilometers apart. The connection must support 100 Gbps throughput with minimal latency and
must be immune to electromagnetic interference. Which transmission medium should the
engineer select?
A. Category 8 copper cabling
B. Multimode fiber optic cable
C. Single-mode fiber optic cable
D. Coaxial cable with amplifiers
-” detailed answer 100 % correct :-”C
Rationale: Single-mode fiber optic cable supports distances up to 100+ kilometers at high
speeds (100 Gbps+), is immune to EMI, and provides low latency. Multimode fiber is typically
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limited to 2 km or less for high-speed transmissions. Category 8 copper is limited to
approximately 30 meters. Coaxial cable cannot support 100 Gbps over 85 km.
Question 3
Which of the following IPv4 address ranges is designated for Automatic Private IP Addressing
(APIPA) and is non-routable on the public Internet?
A. 10.0.0.0 – 10.255.255.255
B. 169.254.0.0 – 169.254.255.255
C. 172.16.0.0 – 172.31.255.255
D. 192.168.0.0 – 192.168.255.255
-” detailed answer 100 % correct :-”B
Rationale: The APIPA range is 169.254.0.0/16, used by devices when DHCP servers are
unavailable. Options A, C, and D are RFC1918 private address ranges (10.0.0.0/8, 172.16.0.0/12,
and 192.168.0.0/16) that are also non-routable but are not APIPA.
Question 4
A network administrator is troubleshooting a connectivity issue and examines a packet capture.
The destination MAC address in the Ethernet frame is FF:FF:FF:FF:FF:FF. How will a switch处理
this frame?
A. Forward the frame only to the port associated with the destination MAC
B. Drop the frame because the MAC address is invalid
C. Flood the frame to all ports except the source port
D. Send the frame to the default gateway for further processing
-” detailed answer 100 % correct :-”C
Rationale: FF:FF:FF:FF:FF:FF is the Ethernet broadcast MAC address. Switches flood broadcast
frames to all ports except the source port. Unicast frames are forwarded to specific ports based
on the MAC address table. The switch does not drop broadcast frames or forward them to the
gateway by default.
Question 5
Which of the following protocols operates at the Transport layer of the OSI model and provides
connection-oriented, reliable data delivery with flow control and error recovery?
, 4
A. UDP
B. IP
C. TCP
D. ICMP
-” detailed answer 100 % correct :-”C
Rationale: TCP (Transmission Control Protocol) operates at Layer 4 (Transport) and provides
connection-oriented, reliable delivery with sequencing, acknowledgment, flow control, and
error recovery. UDP is connectionless and unreliable. IP operates at Layer 3 (Network). ICMP
operates at Layer 3 and is used for diagnostics.
Question 6
An organization requires that all network devices synchronize their clocks to a centralized time
source for accurate logging and forensic analysis. Which of the following protocols should be
implemented?
A. SNMP
B. LDAP
C. NTP
D. SIP
-” detailed answer 100 % correct :-”C
Rationale: Network Time Protocol (NTP) is used to synchronize clocks across network devices.
SNMP is for network management and monitoring. LDAP is for directory services
authentication. SIP is for session initiation in VoIP communications.
Question 7
A network technician is configuring a small office network and needs to divide a single Class C
network into four equal-sized subnets. The network address is 192.168.1.0/24. What subnet
mask should the technician use?
A. 255.255.255.128
B. 255.255.255.192
C. 255.255.255.224
D. 255.255.255.240
-” detailed answer 100 % correct :-”B
Rationale: To create four equal subnets from a /24 network, the technician needs to borrow 2
CompTIA Network+ (N10-009)
Practice Exam 150
Advanced/Hard Multiple-Choice
Questions with Answers and
Rationales a well detailed one
written and graded
A+ upgraded
, 2
Domain 1: Networking Concepts (23%)
Question 1
A network administrator is designing a new data center network and must choose a topology
that provides the highest level of redundancy while minimizing single points of failure. The
design requires that every switch connects to at least two other switches, and traffic can take
multiple paths between any two endpoints. Which of the following topologies BEST meets these
requirements?
A. Star topology
B. Ring topology
C. Full mesh topology
D. Bus topology
-” detailed answer 100 % correct :-”C
Rationale: A full mesh topology provides the highest redundancy because every device
connects to every other device, eliminating single points of failure. Star topology has a single
point of failure at the central hub/switch. Ring topology provides redundancy only if configured
with dual rings. Bus topology has no redundancy and a single cable failure brings down the
entire segment.
Question 2
A network engineer needs to interconnect two geographically separated data centers located 85
kilometers apart. The connection must support 100 Gbps throughput with minimal latency and
must be immune to electromagnetic interference. Which transmission medium should the
engineer select?
A. Category 8 copper cabling
B. Multimode fiber optic cable
C. Single-mode fiber optic cable
D. Coaxial cable with amplifiers
-” detailed answer 100 % correct :-”C
Rationale: Single-mode fiber optic cable supports distances up to 100+ kilometers at high
speeds (100 Gbps+), is immune to EMI, and provides low latency. Multimode fiber is typically
, 3
limited to 2 km or less for high-speed transmissions. Category 8 copper is limited to
approximately 30 meters. Coaxial cable cannot support 100 Gbps over 85 km.
Question 3
Which of the following IPv4 address ranges is designated for Automatic Private IP Addressing
(APIPA) and is non-routable on the public Internet?
A. 10.0.0.0 – 10.255.255.255
B. 169.254.0.0 – 169.254.255.255
C. 172.16.0.0 – 172.31.255.255
D. 192.168.0.0 – 192.168.255.255
-” detailed answer 100 % correct :-”B
Rationale: The APIPA range is 169.254.0.0/16, used by devices when DHCP servers are
unavailable. Options A, C, and D are RFC1918 private address ranges (10.0.0.0/8, 172.16.0.0/12,
and 192.168.0.0/16) that are also non-routable but are not APIPA.
Question 4
A network administrator is troubleshooting a connectivity issue and examines a packet capture.
The destination MAC address in the Ethernet frame is FF:FF:FF:FF:FF:FF. How will a switch处理
this frame?
A. Forward the frame only to the port associated with the destination MAC
B. Drop the frame because the MAC address is invalid
C. Flood the frame to all ports except the source port
D. Send the frame to the default gateway for further processing
-” detailed answer 100 % correct :-”C
Rationale: FF:FF:FF:FF:FF:FF is the Ethernet broadcast MAC address. Switches flood broadcast
frames to all ports except the source port. Unicast frames are forwarded to specific ports based
on the MAC address table. The switch does not drop broadcast frames or forward them to the
gateway by default.
Question 5
Which of the following protocols operates at the Transport layer of the OSI model and provides
connection-oriented, reliable data delivery with flow control and error recovery?
, 4
A. UDP
B. IP
C. TCP
D. ICMP
-” detailed answer 100 % correct :-”C
Rationale: TCP (Transmission Control Protocol) operates at Layer 4 (Transport) and provides
connection-oriented, reliable delivery with sequencing, acknowledgment, flow control, and
error recovery. UDP is connectionless and unreliable. IP operates at Layer 3 (Network). ICMP
operates at Layer 3 and is used for diagnostics.
Question 6
An organization requires that all network devices synchronize their clocks to a centralized time
source for accurate logging and forensic analysis. Which of the following protocols should be
implemented?
A. SNMP
B. LDAP
C. NTP
D. SIP
-” detailed answer 100 % correct :-”C
Rationale: Network Time Protocol (NTP) is used to synchronize clocks across network devices.
SNMP is for network management and monitoring. LDAP is for directory services
authentication. SIP is for session initiation in VoIP communications.
Question 7
A network technician is configuring a small office network and needs to divide a single Class C
network into four equal-sized subnets. The network address is 192.168.1.0/24. What subnet
mask should the technician use?
A. 255.255.255.128
B. 255.255.255.192
C. 255.255.255.224
D. 255.255.255.240
-” detailed answer 100 % correct :-”B
Rationale: To create four equal subnets from a /24 network, the technician needs to borrow 2
