CCNA Subnetting Questions

Incorrect. 10.24.7.191 is the last address of a larger /26 subnet block, not the /27 block containing 10.24.7.158, so it cannot be the broadcast address here.

Incorrect. 10.24.7.127 is the broadcast address of the previous /27 subnet block (10.24.7.96/27), not the one containing 10.24.7.158.

Incorrect. 10.24.7.160 is the network address of the next /27 subnet block after 10.24.7.128/27, not the broadcast address of the current subnet.

The subnet mask /24 is too large, causing a mismatch with R2's /30; the default gateway must be R2's IP (203.0.113.2); EUI-64 is not used on G0/0.

The duplicate IPv4 address on G0/1 is not resolved; it still uses 192.168.1.1 which is already assigned to R3.

EUI-64 is required on G0/0, not G0/1; static IPv6 is required on G0/1, not G0/0.

The /26 prefix corresponds to subnet mask 255.255.255.192, which has 64 addresses per subnet, not 32. The mask 255.255.255.224 has 27 network bits, not 26.

The /28 prefix corresponds to subnet mask 255.255.255.240, which provides 16 addresses per subnet (14 usable). The mask 255.255.255.224 has 32 addresses per subnet, so /28 is incorrect.

The /29 prefix corresponds to subnet mask 255.255.255.248, which provides 8 addresses per subnet (6 usable). The mask 255.255.255.224 has 32 addresses, so /29 is incorrect.

The specific factual error: Using a /24 mask on a point-to-point link wastes addresses and may cause subnet overlap; also, R2 needs a default route to reach R1's IPv4 address if the mask is /30, but with /24 they are in the same subnet so no default route is needed, but the mask is still wrong.

The specific factual error: R2's IPv4 mask must match R1's mask to ensure both routers agree on the subnet boundary. Using /28 on R2 while R1 uses /30 creates a mismatch.

The specific factual error: Assigning the same IPv6 address to both routers causes a duplicate address conflict, preventing communication.

Using a /16 subnet mask (255.255.0.0) does not match the corporate /24 network, leading to incorrect network identification and potential routing issues.

Leaving the default gateway blank prevents the host from reaching any network beyond its own subnet, so internet access is impossible.

Setting the default gateway to the host's own IP address (192.168.1.50) would cause traffic to be sent to itself, never reaching the actual gateway.

This range includes the network address (.96) and the broadcast address (.111), which cannot be assigned to hosts. Usable host addresses must exclude these two addresses.

This range starts at .98, which excludes the valid host .97, and ends at .111, which includes the broadcast address. The correct usable range is .97 to .110.

This range (192.168.200.81 to .94) belongs to a different subnet. For a /28 subnet starting at .96, the valid host range is .97 to .110. This range is from a previous subnet (e.g., 192.168.200.80/28).

A duplicate IP would cause intermittent or lost connectivity and likely prevent a consistent reply from the gateway.

Being on the wrong VLAN would typically prevent the workstation from receiving an IP in the 192.168.1.0/24 subnet and reaching the gateway at 192.168.1.1.

DNS is only used for name resolution; pinging an IP address directly does not involve DNS, so a DNS misconfiguration cannot cause the ping failure to 8.8.8.8.

The address 172.16.10.31 is the broadcast address for the /27 subnet 172.16.10.0–31, not for the subnet containing host 172.16.10.62. Since the host's IP is in the 32–63 range, the broadcast is .63, not .31.

172.16.10.32 is the network address (subnet ID) of the /27 subnet that includes hosts 32–63. It is not the broadcast address; the broadcast is the last address in the subnet, which is .63.

172.16.10.64 is the network address of the next /27 subnet (64–95), not the broadcast address for the subnet containing .62. The broadcast for the subnet containing .62 is .63.

The subnet mask 255.255.255.192 is /26, which provides 64 total addresses per subnet. Subtracting the network and broadcast addresses leaves 62 usable hosts, not 30. 30 usable hosts corresponds to a /27 subnet mask (255.255.255.224).

126 usable hosts would require a /25 subnet mask (255.255.255.128), which provides 128 total addresses. The given mask /26 provides only 64 total addresses, so 126 is incorrect.

254 usable hosts corresponds to a /24 subnet mask (255.255.255.0), which provides 256 total addresses. The mask 255.255.255.192 is /26, which is two bits longer, resulting in only 64 total addresses.

The subnet mask 255.255.255.240 corresponds to a /28 prefix length, not /29. This mask has 28 network bits, leaving 4 host bits, which yields 14 usable hosts per subnet.

The subnet mask 255.255.255.252 corresponds to a /30 prefix length, not /29. A /30 mask has 30 network bits and only 2 host bits, providing 2 usable addresses, typically used for point-to-point links.

The subnet mask 255.255.255.224 corresponds to a /27 prefix length, not /29. A /27 mask has 27 network bits and 5 host bits, providing 30 usable hosts per subnet.

172.16.100.191 is the broadcast address of the previous /27 subnet (172.16.100.160/27), not the subnet containing .222. The host .222 is in the 172.16.100.192/27 subnet, so its broadcast is .223.

172.16.100.224 is the network address of the next /27 subnet (172.16.100.224/27), not a broadcast address. Broadcast addresses are always the last address in a subnet, not the first.

172.16.100.255 is the broadcast address of the entire /24 subnet (172.16.100.0/24), not the /27 subnet containing .222. The /27 subnet has a smaller range, so its broadcast is .223.

The network statement is already correct; changing it does not resolve the incorrect default gateway.

No helper address is needed because the DHCP server (the router itself) is on the same subnet as the PC.

Setting the interface IP to 192.168.1.254 would create an address mismatch with the DHCP pool’s gateway and break the subnet.

The /25 prefix length corresponds to subnet mask 255.255.255.128, not 255.255.255.192. The mask 255.255.255.128 has 128 in the last octet, while 255.255.255.192 has 192, indicating a different number of host bits.

The /27 prefix length corresponds to subnet mask 255.255.255.224, not 255.255.255.192. The mask 255.255.255.224 has 224 in the last octet, which provides 30 usable hosts per subnet, whereas 255.255.255.192 provides 62 usable hosts.

The /28 prefix length corresponds to subnet mask 255.255.255.240, not 255.255.255.192. The mask 255.255.255.240 has 240 in the last octet, which supports 14 usable hosts, while 255.255.255.192 supports 62 usable hosts.

10.10.10.0 is the network address of the 10.10.10.0/25 subnet (range 0-127), but the host IP 10.10.10.130 is not in that range. The /25 mask creates two subnets: 10.10.10.0/25 and 10.10.10.128/25, and .130 belongs to the latter.

10.10.10.64 is not a valid network address for any /25 subnet derived from 10.10.10.0/24. A /25 subnet has a block size of 128, so the network addresses are multiples of 128: 0 and 128. 64 is a multiple of 64, which would be a /26 boundary, not /25.

10.10.10.255 is the broadcast address for the 10.10.10.128/25 subnet, not the network address. The broadcast address is the last address in the subnet (all host bits set to 1), while the network address is the first address (all host bits set to 0).

Syslog is a protocol used for logging and monitoring system events, not for delivering network configuration parameters. It collects and forwards log messages from network devices to a central server for analysis, but does not assign IP settings.

NTP (Network Time Protocol) is designed to synchronize clocks between devices over a network, ensuring accurate timekeeping. It does not provide IP address, subnet mask, default gateway, or DNS server information to hosts.

GRE (Generic Routing Encapsulation) is a tunneling protocol used to encapsulate packets of one protocol within another, typically for creating VPNs or connecting remote networks. It does not provide host configuration parameters like IP addresses or DNS servers.

The /26 subnet mask has a block size of 64, not 32. The network addresses for /26 are 0, 64, 128, and 192. 192.168.60.32 is not a valid network address because it is not a multiple of 64.

192.168.60.64 is the network address of the next /26 subnet (64–127). The host address 192.168.60.33 belongs to the 0–63 range, not the 64–127 range.

192.168.60.63 is the broadcast address of the 192.168.60.0/26 subnet, not the network address. The network address is always the first address in the subnet (all host bits set to 0).

10.10.10.31 is the broadcast address of the previous /27 subnet (10.10.10.0–10.10.10.31), not the subnet containing .33.

10.10.10.32 is the network address (subnet ID) of the subnet containing .33, not the broadcast address. The network address is the first address in the block.

10.10.10.64 is the network address of the next /27 subnet (10.10.10.64–10.10.10.95), not the broadcast address of the subnet containing .33.

The subnet mask on R1 G0/0 should be /30 to match R2, not /24.

The default gateway must be the neighbor's IP address, and IPv6 subnets must match for direct communication.

The requirement states EUI-64 on R1 G0/1, so static is not allowed.

Without a default gateway, the workstation cannot send packets to destinations outside its own subnet (10.10.10.0/24). The DNS server alone only provides name resolution, not routing to other subnets.

Changing the subnet mask to 255.255.0.0 would expand the broadcast domain and could cause routing problems, but it does not provide a path to other subnets. The workstation still needs a default gateway to communicate with devices outside its local network.

The default gateway 10.10.20.1 is not on the same subnet as the workstation (10.10.10.0/24). For a host to reach its default gateway, the gateway must be directly reachable on the local subnet. Since 10.10.20.1 is on a different subnet, the workstation cannot send traffic to it.

Both the network address and broadcast address are reserved addresses within a subnet and cannot be assigned to hosts. The network address identifies the subnet itself, and the broadcast address is used for one-to-all communication. Assigning them to hosts would cause conflicts.

The default gateway is typically the IP address of a router interface on the subnet, which is a normal host address within the usable range. The broadcast address is the last address in the subnet and is reserved for broadcasting; it cannot be used as a gateway.

Network and broadcast addresses are fundamental to IPv4 subnetting and are defined in IPv4 standards. IPv6 does not use broadcast addresses; instead, it uses multicast and anycast. Therefore, stating these concepts exist only in IPv6 is factually incorrect.

PAT works with any transport protocol that has port fields—TCP, UDP, and even ICMP through the identifier field.

Only dynamic translations (from dynamic NAT or PAT) have idle timeouts; static mappings are permanent.

This statement describes dynamic NAT pool exhaustion, not PAT, which uses port multiplexing.

Changing VLANs or using subinterfaces does not solve the problem because the router's physical interface must be up and have an IP address to serve the VLAN.

Enabling DHCP snooping or trust settings on the switch cannot fix a router interface that is administratively down and unassigned.

Assigning a static IP to the PC circumvents but does not resolve the root issue of the router's interface being down, and the scenario requires DHCP.

10.55.8.119 is the broadcast address for the subnet 10.55.8.112/29, not the network address. The broadcast address is the last address in the block (112+8-1=119) and is used to send traffic to all hosts in the subnet.

10.55.8.120 is the network address of the next /29 subnet (120-127), not the current one. The current subnet ends at 119, so 120 belongs to a different subnet.

10.55.8.116 is a valid host address within the subnet 10.55.8.112/29 (usable range: 113-118). It is not the network address, which must be the first address (112).

The specific factual error is that /24 masks are too large for point-to-point links and do not match the expected subnets for R2 and MLS1.

The specific factual error is that the IPv6 address should be configured with the EUI-64 keyword, not a static address.

The specific factual error is that the prefix length must be /64 as specified in the question; a /32 prefix is incorrect for this scenario.

The subnet mask is used to determine the network portion of an IP address and the host portion, not the DNS server address. DNS server addresses are configured separately, either manually or via DHCP.

IPv6 hosts can obtain their IP address via Stateless Address Autoconfiguration (SLAAC), which does not require DHCPv6. DHCPv6 is optional and used for stateful configuration or to provide additional parameters.

The default gateway must be on the same subnet as the host's IP address; otherwise, the host cannot send Ethernet frames to it because the gateway's MAC address would not be reachable via ARP. An arbitrary IP address would not work.

172.16.8.0 is incorrect because the /26 subnet blocks cover 0–63, 64–127, etc., and the host address 70 does not fall within the 0–63 range. Selecting this ignores the actual subnet boundaries defined by the mask.

172.16.8.70 is incorrect because this is the host address itself, not the network address. The network address must be the first address in the subnet block, not a host address within it.

172.16.8.128 is incorrect because this subnet block starts at 128, which is above the host address 70. The host does not belong to this subnet, so this cannot be the network address.

ARP operates only on the local subnet and cannot resolve IP addresses beyond it, so the host cannot use ARP to reach all Internet destinations directly.

The subnet mask defines the local network boundary but does not provide a route to other networks; a default gateway or specific route is required for off-subnet traffic.

Proxy ARP may allow a host without a default gateway to reach some off-subnet destinations if the router responds to ARP requests for remote IPs, but this is not a general solution and does not enable reliable Internet access.

192.168.14.207 is the broadcast address of the previous /28 subnet (192.168.14.192/28), not the subnet containing 192.168.14.222.

192.168.14.208 is the network address (subnet ID) of the /28 subnet containing .222, not the broadcast address.

192.168.14.224 is the network address of the next /28 subnet (192.168.14.224/28), not the broadcast of the current subnet.

Subnet masks are used solely for IP addressing and routing purposes, not for name resolution. Hostname-to-IP-address resolution is performed by the Domain Name System (DNS), which is a completely different protocol and service.

Subnet masks do not provide any encryption or security functionality. Encryption of packets is performed by protocols such as IPsec, TLS, or other cryptographic mechanisms, which operate independently of subnet masking.

A default gateway is still required for any traffic destined to a different subnet. The subnet mask only defines the local network boundary; it does not provide routing to other networks. Without a default gateway, a host cannot send packets off its subnet.

192.168.50.159 is the broadcast address for the 192.168.50.128/27 subnet, not the network address. The broadcast address is used to send packets to all hosts in the subnet and cannot be assigned to a host.

192.168.50.160 is the network address of the next /27 subnet (160-191), not the subnet containing 158. The /27 mask creates subnets with a block size of 32, so the subnet boundaries are multiples of 32.

192.168.50.96 is the network address of the 96-127 /27 subnet, which is an earlier subnet. The address 158 falls in the 128-159 range, not the 96-127 range.

192.168.50.127 is the broadcast address for the lower /25 subnet (192.168.50.0/25), not the subnet containing 192.168.50.130. Since the host IP is in the upper subnet, this option is incorrect.

192.168.50.128 is the network address of the upper /25 subnet (192.168.50.128/25), not the broadcast address. Network addresses cannot be assigned to hosts or used as broadcast addresses, so this option is incorrect.

192.168.50.254 is a valid usable host address within the upper /25 subnet. It is not the broadcast address, so this option is incorrect.

The specific factual error: 192.0.2.2 is already used by R2, causing an IP conflict; static assignment on G0/1 does not guarantee uniqueness.

The specific factual error: /24 mask is too large and does not match the /30 subnet; EUI-64 cannot be applied alongside a static address—it replaces the interface ID.

The specific factual error: 192.0.2.2 is already assigned to R2, so R1 cannot use it; the correct fix is to adjust the mask, not the IP.

192.168.88.32 is the network address of the previous /27 subnet (32-63). Since the host address 192.168.88.66 falls in the 64-95 range, the correct network address is 192.168.88.64, not 192.168.88.32.

192.168.88.95 is the broadcast address for the /27 subnet that starts at 192.168.88.64. The broadcast address is the last address in the subnet, used to send packets to all hosts in that subnet, not the network address.

192.168.88.96 is the network address of the next /27 subnet (96-127). The host 192.168.88.66 is not in that range; it belongs to the subnet starting at 192.168.88.64.

192.168.1.7 is the broadcast address for the /29 block 0–7, which does not contain host .14. The host .14 is in the block 8–15, so its broadcast is .15.

192.168.1.14 is the host address itself, not the broadcast address. The broadcast address is always the last address in the subnet, which is .15 for the block 8–15.

192.168.1.16 is the network address of the next /29 block (16–23), not the broadcast address for the block containing .14. The broadcast address must be the last address in the same block as the host.

An STP root bridge ID is irrelevant to host IP reachability because it pertains to Layer 2 spanning tree topology and does not affect IP routing or DHCP configuration for hosts.

A voice VLAN value is specific to voice traffic segmentation on switches and does not influence a host’s ability to route IP packets to remote networks, making it unrelated to the connectivity issue.

A router ID is a concept used in routing protocols like OSPF and does not apply to DHCP or host IP configuration, so it cannot cause the described connectivity problem.

The workstation likely has DHCP enabled, but the switch's SVI being down prevents DHCP discovery from reaching a server.

A VLAN mismatch would likely result in a different IP address or no connectivity, but the SVI being down is a more direct cause.

The absence of a DHCP server is a possible cause, but the exhibit clearly shows the SVI is administratively down, which is a more specific and immediate issue.

Option A is incorrect because the subnet mask 255.255.254.0 corresponds to a prefix length of /23, not /22. A /22 prefix would indicate a subnet mask of 255.255.252.0.

The subnet mask 255.255.254.0 corresponds to a prefix length of /23, not /24. A /24 prefix length would indicate a subnet mask of 255.255.255.0, which allows for fewer hosts per subnet.

Option D is incorrect because a subnet mask of 255.255.254.0 corresponds to a prefix length of /23, not /25. A /25 subnet mask would allow for only 128 IP addresses, which is not applicable here.

Incorrect because STP priority is a Layer 2 switch parameter that does not affect host IP routing or the ability to reach remote networks. Hosts do not participate in STP decisions.

Incorrect because voice VLAN settings relate to Layer 2 segmentation for voice traffic and do not impact the host’s IP routing or default gateway configuration needed for remote communication.

Incorrect because hosts do not run routing protocols like OSPF and do not require an OSPF process ID. Routing protocols are configured on routers, not end hosts.

10.20.30.32 is incorrect because the host IP 10.20.30.95 does not fall within the 32–63 subnet block. This address belongs to a different subnet block and cannot be the network address for the given host.

10.20.30.95 is incorrect because it is the host IP address itself, not the network address. The network address must be the first address in the subnet block, not a host address.

10.20.30.96 is incorrect because it is the first address of the next subnet block (96–127). The host IP 10.20.30.95 belongs to the previous block, so 10.20.30.96 cannot be its network address.

Option A (192.0.2.80) is incorrect because the subnet mask /28 indicates a block size of 16, making the valid network addresses range from 192.0.2.96 to 192.0.2.111. The network address for this subnet is 192.0.2.96.

The address 192.0.2.111 is not a valid network address for the subnet defined by 192.0.2.97/28, as it falls outside the range of usable addresses for that subnet, which spans from 192.0.2.96 to 192.0.2.111.

Option D, 192.0.2.112, is wrong because it does not represent the network address for the subnet defined by the IP address 192.0.2.97/28. The correct network address is 192.0.2.96, which is the first address in the subnet range.

Option A states 12 usable hosts, which is incorrect because a /28 subnet provides 16 total addresses. Subtracting the network and broadcast addresses leaves 14 usable hosts, not 12. This option underestimates the host capacity.

Option C claims 16 usable hosts, which is incorrect because 16 represents the total number of addresses in the subnet, including network and broadcast addresses. Usable hosts must exclude these two reserved addresses.

Option D suggests 30 usable hosts, which corresponds to a /27 subnet mask (255.255.255.224), not /28. This overestimates the host count for the given subnet mask and is therefore incorrect.

16 would be the total addresses for a /28 mask (4 host bits), not the /27 mask specified.

30 is the number of usable host addresses (total addresses minus network and broadcast), not the total addresses.

64 would be the total addresses for a /26 mask (6 host bits), not the /27 mask specified.

The default gateway must be the IP address of the directly connected neighbor (R2's G0/0), which is 10.0.0.2, not 10.0.0.1.

The IP address 10.0.0.6/30 is in the same subnet as R2's G0/1 (10.0.0.5/30), so it does not resolve the duplicate address conflict. A different subnet must be used.

CAPWAP tunnels require the AP to have an IP address; the statement is false.

CAPWAP operates over IP using UDP ports, not PPP.

The controller may have an AP capacity limit, but with only one AP failing and no evidence that the limit is 14, this is not the strongest explanation.

This option is incorrect because ARP is used for local subnet communication and does not depend on the presence of a default gateway. The host can still use ARP to communicate locally.

This option is wrong because a host does not automatically become part of every remote subnet without a gateway. The subnet mask defines the local subnet boundaries, and gateway absence does not change this.

This option is unrelated to the problem. Converting an access port to a trunk port affects VLAN tagging on switches but does not impact a host’s ability to have or use a default gateway.

Duplicate IP conflicts typically result in a warning but do not cause the system to assign a 169.254.x.x address.

DNS issues do not affect IP address assignment via DHCP.

The subnet mask is correct for the APIPA range; the problem is the lack of a DHCP server response.

This option is incorrect because ARP is used for local Layer 2 address resolution and remains functional even if the default gateway is missing; the host can still resolve MAC addresses on the local subnet.

This option is incorrect because the host’s subnet membership is determined by its IP address and subnet mask, not by the presence or absence of a default gateway; it does not join other subnets automatically.

This option is incorrect because a host does not become a default gateway for other devices simply by lacking a configured gateway; routing and gateway roles require explicit configuration on routers.

Option A (192.168.5.63) is incorrect because it does not fall within the subnet defined by the address 192.168.5.126/25, which has a valid range of 192.168.5.128 to 192.168.5.255 for host addresses.

The address 192.168.5.128 is incorrect because it falls outside the subnet defined by 192.168.5.126/25, which includes addresses from 192.168.5.0 to 192.168.5.127. The broadcast address for this subnet is 192.168.5.127.

Option D, 192.168.5.255, is incorrect because it is the broadcast address for the entire 192.168.5.0/24 subnet, not the /25 subnet specified in the question.

Option A (192.168.20.159) is incorrect because the broadcast address for the subnet 192.168.20.128/26 is 192.168.20.191, calculated as the highest address in the subnet range from 192.168.20.128 to 192.168.20.191.

The option C, 192.168.20.192, is incorrect because it falls outside the range of the subnet defined by 192.168.20.128/26, which has a valid broadcast address of 192.168.20.191.

The broadcast address for the subnet 192.168.20.128/26 is 192.168.20.191, not 192.168.20.255. The address 192.168.20.255 is the broadcast address for the entire 192.168.20.0/24 network, which is not relevant to the specified subnet.

A /27 subnet provides only 30 usable host addresses, which is insufficient for the requirement of 50 usable addresses. Therefore, it does not meet the needs of the branch LAN.

Option C: /25 provides 126 usable addresses, which exceeds the requirement of 50 usable addresses. However, it is not the smallest prefix that meets the requirement.

Option D, /24, provides 256 total addresses, which exceeds the requirement of 50 usable addresses. However, it is not the smallest prefix that meets the requirement, as /26 provides 64 addresses, which is sufficient and more efficient.

The address 10.1.1.31 is incorrect as a broadcast address for the subnet 10.1.1.34/30; the correct broadcast address is 10.1.1.35, derived from the subnet mask which allows for only 4 IP addresses (10.1.1.34 to 10.1.1.37).

The address 10.1.1.32 is not the broadcast address for the subnet 10.1.1.34/30; instead, it is the network address for the subnet, which is 10.1.1.32 to 10.1.1.35.

The address 10.1.1.36 is incorrect because it exceeds the valid range for a /30 subnet, which only allows for four IP addresses (two usable hosts, one network, and one broadcast). The broadcast address for the subnet 10.1.1.34/30 is 10.1.1.35.

Option B is incorrect because the broadcast address for the subnet 192.168.30.0/26 is 192.168.30.63, not 192.168.30.64. The address 192.168.30.64 is actually the first address of the next subnet (192.168.30.64/26).

The address 192.168.30.255 is incorrect as the broadcast address for the subnet 192.168.30.0/26, which only spans IPs from 192.168.30.0 to 192.168.30.63. The broadcast address for this subnet is 192.168.30.63.

Option D, 192.168.30.31, is incorrect because it represents the last usable IP address in the subnet 192.168.30.0/26, not the broadcast address. The broadcast address for this subnet is 192.168.30.63.

The port status is 'connected', not err-disabled.

No information suggests the client should be in VLAN 200; the configuration matches the intended VLAN.

Duplex mismatch would typically cause errors or speed/duplex issues, but the switch shows a-full, so this is not the problem.

The APIPA address indicates a DHCP failure, not a DNS problem.

A static IP conflict would not result in an APIPA address; the laptop would show the manually configured IP, not 169.254.x.x.

A physical cable issue would prevent link, so the laptop would not even attempt DHCP and would not get an APIPA address.

The default gateway must be R2's directly connected interface IP (192.0.2.2), not 192.0.2.254. EUI-64 cannot be used if the peer expects a specific static address on the same subnet.

The subnet mask must be consistent on both ends of the link. A /24 mask on one side and /30 on the other creates overlapping subnets and routing issues.

EUI-64 does not guarantee that the resulting IPv6 address will be on the same subnet as a statically configured peer address. For direct connectivity, both routers must have addresses in the same subnet.

The subnet mask on G0/0 must be /24 to match the connected network; a /30 mask would put R2 in a different subnet. Also, the duplicate IP on G0/1 is not resolved.

IPv6 must be configured on both interfaces to enable IPv6 connectivity. Omitting IPv6 on G0/1 leaves the interface without IPv6 capability.

The subnet mask on G0/0 must be changed to /24 to match the network 198.51.100.0/24. Keeping /30 is the original wrong configuration.

Option B, 10.77.4.143, is incorrect because it falls within the usable host range of the subnet defined by 10.77.4.128/28, which spans from 10.77.4.129 to 10.77.4.142. The network address must always be the first address in the subnet.

This option is wrong because 10.77.4.144 is not the network address for the subnet defined by 10.77.4.141/28; the correct network address is 10.77.4.128, which is the first address in the subnet range.

Option D, 10.77.4.112, is incorrect because it does not fall within the subnet defined by the CIDR notation /28, which covers addresses from 10.77.4.128 to 10.77.4.143. The network address for this subnet is 10.77.4.128.

10.100.12.63 is the broadcast address of the 0–63 subnet, not the one containing 94.

10.100.12.64 is the network address of the 64–127 subnet, not the broadcast.

10.100.12.128 is the network address of the 128–191 subnet, not the broadcast.

Option A is incorrect because the broadcast address for the subnet 172.22.14.99/27 is 172.22.14.127, not 172.22.14.95. The /27 subnet mask indicates that the last 5 bits are for host addresses, allowing for a range of addresses that ends at 172.22.14.127.

Option C (172.22.14.96) is incorrect because it falls within the usable host range of the subnet and is not the broadcast address. The broadcast address for the subnet 172.22.14.96/27 is actually 172.22.14.127.

Option D, 172.22.14.128, is incorrect because it does not fall within the subnet defined by 172.22.14.99/27, which has a valid range of 172.22.14.96 to 172.22.14.127. The broadcast address for this subnet is 172.22.14.127.

Option A, 10.10.10.7, is incorrect because it does not represent the broadcast address for the subnet defined by 10.10.10.14/29. The correct broadcast address is 10.10.10.15, which is the highest address in the subnet range.

The address 10.10.10.8 is not the broadcast address for the subnet 10.10.10.14/29. The correct broadcast address is 10.10.10.15, which is the highest address in the subnet range from 10.10.10.8 to 10.10.10.15.

The address 10.10.10.16 is outside the subnet defined by 10.10.10.14/29, which includes addresses from 10.10.10.8 to 10.10.10.15. Therefore, it cannot be the broadcast address for this subnet.