Topic 03 Practice Test 3 covers IPv4 Addressing, Subnetting, and Private Addressing for Cisco Certified Network Associate 200-301 CCNA and maps to objectives 1.6–1.7. For broader exam preparation, review the Cisco CCNA 200-301 Exam Dumps. Every option includes focused technical reasoning explaining both the networking concept and its fit to the scenario.
Question 1
Before Orchard hands the Odyssey service to operations, Leila must close verification item CHG-2920. A branch router interface is configured as 198.51.100.200/25. During an addressing review, which IPv4 address is the subnet ID for that interface? Choose ONE.
- 198.51.100.255
- 198.51.100.129
- 198.51.100.254
- 198.51.100.128
Correct Answer: D
Correct Answer
Answer D is correct because Applying the /25 prefix to 198.51.100.200 leaves network address 198.51.100.128. A subnet ID has all host bits set to zero, so it identifies the subnet rather than an endpoint.
Incorrect Answers
Answer A is incorrect because 198.51.100.255 is the directed broadcast address for 198.51.100.128/25. Its host bits are all ones, so it cannot be the subnet ID being requested. The requested network outcome depends on this property being true in the current context.
Answer B is incorrect because 198.51.100.129 is a usable host address inside 198.51.100.128/25. Usable host addresses have a nonzero host portion and therefore do not identify the subnet itself. The scenario requires that exact behavior rather than a generally related network concept.
Answer C is incorrect because 198.51.100.254 is a usable host address inside 198.51.100.128/25. Usable host addresses have a nonzero host portion and therefore do not identify the subnet itself. The expected result follows from the device state and protocol semantics given in the question.
Question 2
A peer review for Vantage at Quarry assigns Felix the evidence check recorded as CHG-2933. A technician is documenting subnet 10.44.8.0/23, which contains host 10.44.9.21. What is the directed broadcast address for this subnet? Choose ONE.
- 10.44.9.255
- 10.44.8.0
- 10.44.8.1
- 10.44.9.254
Correct Answer: A
Correct Answer
Answer A is correct because For 10.44.8.0/23, setting every host bit to one produces 10.44.9.255. That value is reserved as the directed broadcast address for the subnet. The device applies the relevant rule to the stated values, which determines the outcome.
Incorrect Answers
Answer B is incorrect because 10.44.8.0 is the network address with all host bits zero. The question asks for the opposite boundary value, where the host portion is all ones. The engineer must match the requested behavior, not just choose a value that is generally valid elsewhere.
Answer C is incorrect because 10.44.8.1 falls inside the usable host range 10.44.8.1 through 10.44.9.254. A usable endpoint address is not the directed broadcast address. This criterion is what separates the correct operational result from the other plausible alternatives.
Answer D is incorrect because 10.44.9.254 falls inside the usable host range 10.44.8.1 through 10.44.9.254. A usable endpoint address is not the directed broadcast address. The network device applies this rule consistently when processing the described configuration or traffic.
Question 3
The Rosewood branch is staging Circuit; Aya is completing the implementation checklist for CHG-2946. An engineer reserves the first usable IPv4 address in 172.31.32.0/20 for the default gateway. Which address should be assigned? Choose ONE.
- 172.31.47.254
- 172.31.32.1
- 172.31.32.0
- 172.31.47.255
Correct Answer: B
Correct Answer
Answer B is correct because The network address is 172.31.32.0, so the next address, 172.31.32.1, is the first usable host. That makes it suitable for the gateway reservation described. The outcome is determined by the stated addressing or forwarding condition rather than by naming convention.
Incorrect Answers
Answer C is incorrect because 172.31.32.0 identifies the subnet itself. A network ID cannot be assigned to the gateway interface as a host address. That makes the option unsuitable for this specific verification goal even if it is valid in another context.
Answer D is incorrect because 172.31.47.255 is the directed broadcast address. It is reserved for reaching all hosts on the subnet and cannot be assigned to the gateway. This matters during verification because the configured value determines the device behavior being tested.
Answer A is incorrect because 172.31.47.254 is usable but it is the last host in the subnet. The requirement specifically reserves the first usable address, not merely any valid host address. The network behavior is determined by this rule when the stated values are applied.
Question 4
As part of Beacon readiness at Springdale, Layla investigates the condition logged in CHG-2959. A branch router interface is configured as 192.0.2.100/26. During an addressing review, which IPv4 address is the subnet ID for that interface? Choose ONE.
- 192.0.2.65
- 192.0.2.126
- 192.0.2.64
- 192.0.2.127
Correct Answer: C
Correct Answer
Answer C is correct because Applying the /26 prefix to 192.0.2.100 leaves network address 192.0.2.64. A subnet ID has all host bits set to zero, so it identifies the subnet rather than an endpoint.
Incorrect Answers
Answer D is incorrect because 192.0.2.127 is the directed broadcast address for 192.0.2.64/26. Its host bits are all ones, so it cannot be the subnet ID being requested. The scenario requires that exact behavior rather than a generally related network concept.
Answer A is incorrect because 192.0.2.65 is a usable host address inside 192.0.2.64/26. Usable host addresses have a nonzero host portion and therefore do not identify the subnet itself. This choice aligns with both the protocol rule and the operational condition being tested.
Answer B is incorrect because 192.0.2.126 is a usable host address inside 192.0.2.64/26. Usable host addresses have a nonzero host portion and therefore do not identify the subnet itself. The operational distinction is visible in the resulting interface, address, or forwarding state.
Question 5
Operations at Timberline asks Marta to validate Ion before approving change CHG-2972. A new user VLAN must support at least 6 simultaneously addressed endpoints, and the engineer wants the smallest conventional IPv4 subnet that meets the requirement. Which prefix length should be used? Choose ONE.
- /30
- /28
- /24
- /29
Correct Answer: D
Correct Answer
Answer D is correct because A /29 leaves 3 host bits, giving 6 usable host addresses after the network and broadcast addresses. 6 meets the 6-host requirement while using the longest prefix that still has enough capacity.
Incorrect Answers
Answer A is incorrect because A /30 provides only 2 usable host addresses. That capacity is below the endpoint requirement, so the design would exhaust its usable addresses. The protocol semantics make this the appropriate interpretation for the values shown.
Answer B is incorrect because A /28 provides 14 usable host addresses. It would work, but it is larger than necessary because /29 already satisfies the 6-host requirement. A correct implementation must satisfy that property rather than a superficially similar one.
Answer C is incorrect because A /24 provides 254 usable host addresses. It would work, but it is larger than necessary because /29 already satisfies the 6-host requirement. The requested outcome follows from the protocol rule being exercised in this scenario.
Question 6
The Pulse deployment at Union has reached its verification gate; Ibrahim is handling CHG-2985. A new user VLAN must support at least 30 simultaneously addressed endpoints, and the engineer wants the smallest conventional IPv4 subnet that meets the requirement. Which prefix length should be used? Choose ONE.
- /27
- /28
- /26
- /29
Correct Answer: A
Correct Answer
Answer A is correct because A /27 leaves 5 host bits, giving 30 usable host addresses after the network and broadcast addresses. 30 meets the 30-host requirement while using the longest prefix that still has enough capacity.
Incorrect Answers
Answer B is incorrect because A /28 provides only 14 usable host addresses. The usable-host count is insufficient for the stated population and would leave some endpoints without an address. That distinction prevents a valid-looking alternative from meeting the actual requirement.
Answer C is incorrect because A /26 provides 62 usable host addresses. It would work, but it is larger than necessary because /27 already satisfies the 30-host requirement. The described state leads to this result when the device processes the configuration or traffic.
Answer D is incorrect because A /29 provides only 6 usable host addresses. Because this subnet supports fewer hosts than required, it cannot satisfy the VLAN capacity target. The device evaluates this property directly when it performs the relevant lookup or interface operation.
Question 7
At the Valleyview office, Nora checks a Waypoint design assumption while processing CHG-2998. A new user VLAN must support at least 500 simultaneously addressed endpoints, and the engineer wants the smallest conventional IPv4 subnet that meets the requirement. Which prefix length should be used? Choose ONE.
- /25
- /23
- /24
- /22
Correct Answer: B
Correct Answer
Answer B is correct because A /23 leaves 9 host bits, giving 510 usable host addresses after the network and broadcast addresses. 510 meets the 500-host requirement while using the longest prefix that still has enough capacity.
Incorrect Answers
Answer C is incorrect because A /24 provides only 254 usable host addresses. The host range is too small for the requested endpoint count, making this prefix unsuitable. The scenario therefore hinges on the specific protocol behavior, not merely on a plausible value.
Answer D is incorrect because A /22 provides 1022 usable host addresses. It would work, but it is larger than necessary because /23 already satisfies the 500-host requirement. This is the property an engineer would confirm during an implementation or troubleshooting check.
Answer A is incorrect because A /25 provides only 126 usable host addresses. That capacity is below the endpoint requirement, so the design would exhaust its usable addresses. The described state leads to this result when the device processes the configuration or traffic.
Question 8
Change CHG-3011 covers the Dynamo network at Woodland, where Hugo is the assigned verifier. A Cisco interface must be configured with prefix length /23. Which dotted-decimal subnet mask represents that prefix? Choose ONE.
- 255.255.255.248
- 255.255.255.252
- 255.255.254.0
- 255.255.255.240
Correct Answer: C
Correct Answer
Answer C is correct because A /23 prefix contains 23 one-bits in the mask, which converts to 255.255.254.0. Cisco IOS accepts the dotted-decimal mask with the IPv4 interface address, so this value preserves the intended prefix.
Incorrect Answers
Answer D is incorrect because 255.255.255.240 corresponds to /28, not /23. That mask changes the subnet boundary, which also changes the network address, broadcast address, and usable host interval. The relevant state can be verified from the protocol information and configuration described here.
Answer A is incorrect because 255.255.255.248 corresponds to /29, not /23. Using this mask would define a different subnet and consequently a different broadcast and host range. The device applies the relevant rule to the stated values, which determines the outcome.
Answer B is incorrect because 255.255.255.252 corresponds to /30, not /23. The prefix represented by this mask does not match the requested boundary, so the resulting network and host limits would differ. The protocol semantics make this the appropriate interpretation for the values shown.
Question 9
At Yorkfield, Owen validates the Kodiak cutover under change CHG-3024. A Cisco interface must be configured with prefix length /24. Which dotted-decimal subnet mask represents that prefix? Choose ONE.
- 255.255.252.0
- 255.255.248.0
- 255.255.240.0
- 255.255.255.0
Correct Answer: D
Correct Answer
Answer D is correct because A /24 prefix contains 24 one-bits in the mask, which converts to 255.255.255.0. Cisco IOS accepts the dotted-decimal mask with the IPv4 interface address, so this value preserves the intended prefix.
Incorrect Answers
Answer A is incorrect because 255.255.252.0 corresponds to /22, not /24. That mask changes the subnet boundary, which also changes the network address, broadcast address, and usable host interval. The scenario requires that exact behavior rather than a generally related network concept.
Answer B is incorrect because 255.255.248.0 corresponds to /21, not /24. Using this mask would define a different subnet and consequently a different broadcast and host range. The alternative fails because the operational result differs from what the scenario explicitly requires.
Answer C is incorrect because 255.255.240.0 corresponds to /20, not /24. The prefix represented by this mask does not match the requested boundary, so the resulting network and host limits would differ. The protocol rule makes this distinction observable during configuration validation and troubleshooting.
Question 10
The Raptor migration at Zephyr is in pre-check, and Lena owns ticket CHG-3037. A Cisco interface must be configured with prefix length /20. Which dotted-decimal subnet mask represents that prefix? Choose ONE.
- 255.255.240.0
- 255.255.255.0
- 255.255.255.128
- 255.255.255.192
Correct Answer: A
Correct Answer
Answer A is correct because A /20 prefix contains 20 one-bits in the mask, which converts to 255.255.240.0. Cisco IOS accepts the dotted-decimal mask with the IPv4 interface address, so this value preserves the intended prefix.
Incorrect Answers
Answer B is incorrect because 255.255.255.0 corresponds to /24, not /20. That mask changes the subnet boundary, which also changes the network address, broadcast address, and usable host interval. The correct choice aligns both with the configured state and with the resulting network behavior.
Answer C is incorrect because 255.255.255.128 corresponds to /25, not /20. Using this mask would define a different subnet and consequently a different broadcast and host range. This difference is important because the same device can treat otherwise similar values in different ways.
Answer D is incorrect because 255.255.255.192 corresponds to /26, not /20. The prefix represented by this mask does not match the requested boundary, so the resulting network and host limits would differ. The scenario tests that exact distinction as it would appear during a practical verification workflow.
Question 11
During Amber’s Yield maintenance window, Tariq performs the network acceptance test for CHG-3050. An inventory report lists IPv4 address 10.255.1.2. How should the address be classified for RFC 1918 private-addressing purposes? Choose ONE.
- IPv4 subnet ID
- Private IPv4 address covered by RFC 1918
- Public IPv4 address
- IPv4 directed broadcast address
Correct Answer: B
Correct Answer
Answer B is correct because RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 for private internets. 10.255.1.2 falls inside one of those reserved blocks. The expected result follows from the device state and protocol semantics given in the question.
Incorrect Answers
Answer C is incorrect because An IPv4 address outside the RFC 1918 private blocks is not private merely because it is used inside an organization. 10.255.1.2 is inside a private block, so treating it as public would misclassify the address.
Answer D is incorrect because A directed broadcast is the all-host-bits-one address for a particular subnet, which cannot be decided from a private/public label alone. The scenario asks about address scope; 10.255.1.2 is being classified against RFC 1918 rather than against a specific subnet boundary.
Answer A is incorrect because A subnet ID has all host bits zero for a known prefix and identifies one network rather than private-address scope. No prefix boundary is supplied that makes subnet-ID classification the relevant decision for 10.255.1.2.
Question 12
For ticket CHG-3063, Theo is reviewing the Fusion rollout at the Birch site. An inventory report lists IPv4 address 192.169.1.1. How should the address be classified for RFC 1918 private-addressing purposes? Choose ONE.
- IPv4 subnet ID
- Private IPv4 address covered by RFC 1918
- Public IPv4 address
- IPv4 directed broadcast address
Correct Answer: C
Correct Answer
Answer C is correct because An IPv4 address outside the RFC 1918 private blocks is not private merely because it is used inside an organization. 192.169.1.1 is outside 10/8, 172.16/12, and 192.168/16, so this classification matches the scope.
Incorrect Answers
Answer B is incorrect because RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 for private internets. 192.169.1.1 does not fall inside any of those three blocks.
Answer D is incorrect because A directed broadcast is the all-host-bits-one address for a particular subnet, which cannot be decided from a private/public label alone. The scenario asks about address scope; 192.169.1.1 is being classified against RFC 1918 rather than against a specific subnet boundary.
Answer A is incorrect because A subnet ID has all host bits zero for a known prefix and identifies one network rather than private-address scope. No prefix boundary is supplied that makes subnet-ID classification the relevant decision for 192.169.1.1.
Question 13
Before Coral hands the Echo service to operations, Sara must close verification item CHG-3076. An inventory report lists IPv4 address 172.20.99.5. How should the address be classified for RFC 1918 private-addressing purposes? Choose ONE.
- Public IPv4 address
- IPv4 directed broadcast address
- IPv4 subnet ID
- Private IPv4 address covered by RFC 1918
Correct Answer: D
Correct Answer
Answer D is correct because RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 for private internets. 172.20.99.5 falls inside one of those reserved blocks. The engineer must match the requested behavior, not just choose a value that is generally valid elsewhere.
Incorrect Answers
Answer A is incorrect because An IPv4 address outside the RFC 1918 private blocks is not private merely because it is used inside an organization. 172.20.99.5 is inside a private block, so treating it as public would misclassify the address.
Answer B is incorrect because A directed broadcast is the all-host-bits-one address for a particular subnet, which cannot be decided from a private/public label alone. The scenario asks about address scope; 172.20.99.5 is being classified against RFC 1918 rather than against a specific subnet boundary.
Answer C is incorrect because A subnet ID has all host bits zero for a known prefix and identifies one network rather than private-address scope. No prefix boundary is supplied that makes subnet-ID classification the relevant decision for 172.20.99.5.
Question 14
A peer review for Lumen at Driftwood assigns Rami the evidence check recorded as CHG-3089. Two hosts are configured as 10.10.16.1/20 and 10.10.31.254/20. What does the subnet calculation show? Choose ONE.
- They are in the same IPv4 subnet
- They are in different IPv4 subnets
- The result depends only on the default gateway
- The result depends on the switch MAC table
Correct Answer: A
Correct Answer
Answer A is correct because Applying /20 to 10.10.16.1 gives 10.10.16.0/20, while applying the same prefix to 10.10.31.254 gives 10.10.16.0/20. Both results match, so local subnet delivery is possible without crossing a router.
Incorrect Answers
Answer B is incorrect because The subnet calculation yields 10.10.16.0/20 for 10.10.16.1 and 10.10.16.0/20 for 10.10.31.254. Because the network IDs are identical, classifying the endpoints as separate subnets would be incorrect.
Answer C is incorrect because A default gateway handles off-subnet forwarding; it does not change the subnet derived from an address and its prefix. The address and mask alone are sufficient to derive and compare both IPv4 network IDs. In the A Lumen Driftwood validation, this distinction is directly relevant.
Answer D is incorrect because The switch MAC table is a Layer 2 port-location database, so it cannot determine an IPv4 subnet boundary. Subnet membership follows by applying the shared prefix to each IPv4 address and comparing the resulting network IDs. In the A Lumen Driftwood validation, this distinction is directly relevant.
Question 15
The Evergreen branch is staging Solstice; Max is completing the implementation checklist for CHG-3102. Two hosts are configured as 10.10.15.254/20 and 10.10.16.1/20. What does the subnet calculation show? Choose ONE.
- They are in the same IPv4 subnet
- They are in different IPv4 subnets
- The result depends only on the default gateway
- The result depends on the switch MAC table
Correct Answer: B
Correct Answer
Answer B is correct because The subnet calculation yields 10.10.0.0/20 for 10.10.15.254 and 10.10.16.0/20 for 10.10.16.1. Because the network IDs differ, a Layer 3 path is required between them.
Incorrect Answers
Answer A is incorrect because Applying /20 to 10.10.15.254 gives 10.10.0.0/20, while applying the same prefix to 10.10.16.1 gives 10.10.16.0/20. The network IDs differ, so they cannot be treated as local peers in the same subnet.
Answer C is incorrect because Subnet membership comes from the IP address and prefix, whereas the gateway is only the next hop for remote destinations. Comparing the network portions requires only the two addresses and their shared mask. In the The Evergreen Solstice validation, this distinction is directly relevant.
Answer D is incorrect because MAC-to-port learning is separate from Layer 3 subnet calculation and has no role in deriving the IPv4 network ID. The two IPv4 network IDs come from masking each address with the stated prefix; gateway or MAC state is irrelevant. In the The Evergreen Solstice validation, this distinction is directly relevant.
Question 16
As part of Zenith readiness at Forest, Kenji investigates the condition logged in CHG-3115. Two hosts are configured as 192.168.44.65/27 and 192.168.44.94/27. What does the subnet calculation show? Choose ONE.
- The result depends only on the default gateway
- The result depends on the switch MAC table
- They are in the same IPv4 subnet
- They are in different IPv4 subnets
Correct Answer: C
Correct Answer
Answer C is correct because Applying /27 to 192.168.44.65 gives 192.168.44.64/27, while applying the same prefix to 192.168.44.94 gives 192.168.44.64/27. Both results match, so local subnet delivery is possible without crossing a router.
Incorrect Answers
Answer D is incorrect because The subnet calculation yields 192.168.44.64/27 for 192.168.44.65 and 192.168.44.64/27 for 192.168.44.94. Because the network IDs are identical, classifying the endpoints as separate subnets would be incorrect.
Answer A is incorrect because A default gateway handles off-subnet forwarding; it does not change the subnet derived from an address and its prefix. The address and mask alone are sufficient to derive and compare both IPv4 network IDs. In the As Zenith Forest validation, this distinction is directly relevant.
Answer B is incorrect because The switch MAC table is a Layer 2 port-location database, so it cannot determine an IPv4 subnet boundary. Subnet membership follows by applying the shared prefix to each IPv4 address and comparing the resulting network IDs. In the As Zenith Forest validation, this distinction is directly relevant.
Question 17
Operations at Glenwood asks Zoe to validate Glacier before approving change CHG-3128. Two hosts are configured as 192.168.44.95/27 and 192.168.44.96/27. What does the subnet calculation show? Choose ONE.
- The result depends only on the default gateway
- The result depends on the switch MAC table
- They are in the same IPv4 subnet
- They are in different IPv4 subnets
Correct Answer: D
Correct Answer
Answer D is correct because The subnet calculation yields 192.168.44.64/27 for 192.168.44.95 and 192.168.44.96/27 for 192.168.44.96. Because the network IDs differ, a Layer 3 path is required between them.
Incorrect Answers
Answer C is incorrect because Applying /27 to 192.168.44.95 gives 192.168.44.64/27, while applying the same prefix to 192.168.44.96 gives 192.168.44.96/27. The network IDs differ, so they cannot be treated as local peers in the same subnet.
Answer A is incorrect because Subnet membership comes from the IP address and prefix, whereas the gateway is only the next hop for remote destinations. Comparing the network portions requires only the two addresses and their shared mask. In the Operations Glenwood Zoe validation, this distinction is directly relevant.
Answer B is incorrect because MAC-to-port learning is separate from Layer 3 subnet calculation and has no role in deriving the IPv4 network ID. The two IPv4 network IDs come from masking each address with the stated prefix; gateway or MAC state is irrelevant. In the Operations Glenwood Zoe validation, this distinction is directly relevant.
Question 18
The Nimbus deployment at Heather has reached its verification gate; Ravi is handling CHG-3141. A router shows GigabitEthernet0/1 as administratively down in show ip interface brief after the correct IPv4 address was configured. Which action is required to enable the interface? Choose ONE.
- Enter no shutdown under the interface
- Change the subnet mask to /32
- Clear the MAC address table
- Configure an IPv6 link-local address
Correct Answer: A
Correct Answer
Answer A is correct because An administratively down state means the interface has been disabled by configuration, commonly with the shutdown command. Removing the administrative shutdown allows the interface hardware state to come up when the physical link is available. In the The Nimbus Heather validation, this distinction is directly relevant.
Incorrect Answers
Answer B is incorrect because A /32 mask changes Layer 3 subnet interpretation but does not remove an administrative shutdown. The interface would remain disabled regardless of the configured prefix. This criterion is what separates the correct operational result from the other plausible alternatives.
Answer C is incorrect because Clearing learned Layer 2 addresses affects switching information, not the administrative state of a routed interface. It cannot change an interface from administratively down to enabled. The network device applies this rule consistently when processing the described configuration or traffic.
Answer D is incorrect because Adding IPv6 addressing does not override the configured shutdown state. Administrative enablement must be addressed directly before either IPv4 or IPv6 can operate on the interface. The outcome is determined by the stated addressing or forwarding condition rather than by naming convention.
Question 19
At the Ivory office, Nadia checks a Uplink design assumption while processing CHG-3154. After assigning IPv4 addresses to several router interfaces, an engineer wants a compact table showing each interface, its IPv4 address, and the interface/protocol state. Which command should be used? Choose ONE.
- show running-config | include hostname
- show ip interface brief
- show mac address-table
- show ipv6 interface brief
Correct Answer: B
Correct Answer
Answer B is correct because Show ip interface brief summarizes interface names, assigned IPv4 addresses, configuration method, interface status, and protocol status. That compact output is designed for exactly this verification task. That makes the option unsuitable for this specific verification goal even if it is valid in another context.
Incorrect Answers
Answer C is incorrect because Show mac address-table displays Layer 2 learned or static MAC entries and their VLAN/port associations. It does not provide the requested routed-interface IPv4 summary. This matters during verification because the configured value determines the device behavior being tested.
Answer D is incorrect because Show ipv6 interface brief summarizes IPv6 state and IPv6 addresses. The engineer is validating IPv4 assignments, so the IPv6-specific command is not the requested view. The operational distinction is visible in the resulting interface, address, or forwarding state.
Answer A is incorrect because This filtered configuration view would return hostname-related lines, not a table of interface addresses and states. It therefore cannot efficiently verify the IPv4 addressing requested in the scenario. The alternative would produce a different observable result during validation.
Question 20
Change CHG-3167 covers the Bridge network at Jasper, where Mira is the assigned verifier. A router interface must use IPv4 address 192.0.2.17/27. Which Cisco IOS interface command configures the address with the correct mask? Choose ONE.
- ipv6 address 192.0.2.17/27
- ip default-gateway 192.0.2.17
- ip address 192.0.2.17 255.255.255.224
- ip address 192.0.2.17 255.255.255.240
Correct Answer: C
Correct Answer
Answer C is correct because The ip address interface command takes the IPv4 address followed by a dotted-decimal mask; /27 converts to 255.255.255.224. The command therefore assigns the requested host address and preserves the stated /27 subnet boundary. In the Change CHG-3167 Bridge validation, this distinction is directly relevant.
Incorrect Answers
Answer D is incorrect because 255.255.255.240 represents /28 rather than /27. This would create a smaller subnet and change the network and broadcast boundaries around 192.0.2.17. A correct implementation must satisfy that property rather than a superficially similar one.
Answer A is incorrect because The ipv6 address command configures IPv6 addressing, not an IPv4 address and dotted-decimal mask. The requested address is IPv4, so using the IPv6 command family is syntactically and operationally wrong. The scenario requires that exact behavior rather than a generally related network concept.
Answer B is incorrect because Ip default-gateway identifies a next-hop gateway on a device that is not routing; it does not assign an address to the interface. The task is to configure the interface itself, so a gateway command cannot satisfy it. In the Change CHG-3167 Bridge validation, this distinction is directly relevant.
