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Let's analyze the subnets provided in the image to identify which ones contain errors:

Subnet A:

IP address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}75/27$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}224$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}68$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}95$

Validation:

Subnet mask $/27$ means $255\mathrm{.}255\mathrm{.}255\mathrm{.}224$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64($correct$)$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}95($correct$)$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}68($correct$)$

Subnet A seems correct.

Subnet B:

IP address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}124/26$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}128$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}125$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}127$

Validation:

Subnet mask $/26$ means $255\mathrm{.}255\mathrm{.}255\mathrm{.}192($not $128)$

Correct $/26$ mask is $255\mathrm{.}255\mathrm{.}255\mathrm{.}192,$ making the network address $192\mathrm{.}168\mathrm{.}40\mathrm{.}64.$

With the correct mask, broadcast address should be $192\mathrm{.}168\mathrm{.}40\mathrm{.}127($still incorrect$)$

Host address can be correct within this range but needs subnet correction.

Subnet B has multiple errors.

Subnet C:

IP address: $10\mathrm{.}15\mathrm{.}68\mathrm{.}66/15$

Subnet mask: $255\mathrm{.}254\mathrm{.}0\mathrm{.}0$

Network address: $10\mathrm{.}14\mathrm{.}0\mathrm{.}0$

Host address: $10\mathrm{.}15\mathrm{.}255\mathrm{.}1$

Broadcast address: $10\mathrm{.}16\mathrm{.}255\mathrm{.}255$

Validation:

Subnet mask $/15$ means $255\mathrm{.}254\mathrm{.}0\mathrm{.}0$

Network address: $10\mathrm{.}14\mathrm{.}0\mathrm{.}0($correct$)$

Broadcast address: $10\mathrm{.}15\mathrm{.}255\mathrm{.}255($correct$)$

Host address: $10\mathrm{.}15\mathrm{.}255\mathrm{.}1($correct$)$

Subnet C seems correct.

Subnet D:

IP address: $172\mathrm{.}16\mathrm{.}89\mathrm{.}45/20$

Subnet mask: $255\mathrm{.}255\mathrm{.}240\mathrm{.}0$

Network address: $172\mathrm{.}16\mathrm{.}88\mathrm{.}0$

Host address: $172\mathrm{.}16\mathrm{.}98\mathrm{.}1$

Broadcast address: $172\mathrm{.}16\mathrm{.}95\mathrm{.}255$

Validation:

Subnet mask $/20$ means $255\mathrm{.}255\mathrm{.}240\mathrm{.}0$

Network address: $172\mathrm{.}16\mathrm{.}80\mathrm{.}0($correct$)$

Broadcast address: $172\mathrm{.}16\mathrm{.}95\mathrm{.}255($correct$)$

Host address: $172\mathrm{.}16\mathrm{.}98\mathrm{.}1($not in this range$)$

Subnet D has errors.

Subnet E:

IP address: $172\mathrm{.}16\mathrm{.}35\mathrm{.}45/20$

Subnet mask: $255\mathrm{.}255\mathrm{.}240\mathrm{.}0$

Network address: $172\mathrm{.}16\mathrm{.}40\mathrm{.}9$

Host address: $172\mathrm{.}16\mathrm{.}33\mathrm{.}200$

Broadcast address: $172\mathrm{.}16\mathrm{.}47\mathrm{.}255$

Validation:

Subnet mask $/20$ means $255\mathrm{.}255\mathrm{.}240\mathrm{.}0$

Network address: $172\mathrm{.}16\mathrm{.}32\mathrm{.}0($should be$)$

Broadcast address: $172\mathrm{.}16\mathrm{.}47\mathrm{.}255($correct$)$

Host address: $172\mathrm{.}16\mathrm{.}33\mathrm{.}200($correct within this range$)$

Subnet E has errors.

Conclusion:

Subnets B$,$ D$,$ and E each have more than one error.

Chose one

ChatGPT

Let's focus on Subnet B for a detailed analysis of its errors:

Subnet B:

IP address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}124/26$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}128$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}125$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}127$

Issues Identified:

Subnet Mask: The provided subnet mask of $255\mathrm{.}255\mathrm{.}255\mathrm{.}128$ is incorrect for a $/26$ prefix. The correct subnet mask for a $/26$ prefix should be $255\mathrm{.}255\mathrm{.}255\mathrm{.}192.$

Network Address: The network address calculation is incorrect due to the wrong subnet mask. With the correct subnet mask of $255\mathrm{.}255\mathrm{.}255\mathrm{.}192,$ the network address should be $192\mathrm{.}168\mathrm{.}40\mathrm{.}64.$

Broadcast Address: The provided broadcast address $192\mathrm{.}168\mathrm{.}40\mathrm{.}127$ is correct for the range but not matching the correct mask of $/26.$ The correct broadcast address should be $192\mathrm{.}168\mathrm{.}40\mathrm{.}127$ with the correct subnet mask.

Host Address: The host address given is $192\mathrm{.}168\mathrm{.}40\mathrm{.}125,$ which can be valid within the corrected subnet range $(192\mathrm{.}168\mathrm{.}40\mathrm{.}64/26).$

Correct Calculation for Subnet B with $/26$:

Subnet mask for $/26$: $255\mathrm{.}255\mathrm{.}255\mathrm{.}192$

Correct Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Correct Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}127$

Valid host range: $192\mathrm{.}168\mathrm{.}40\mathrm{.}65$ to $192\mathrm{.}168\mathrm{.}40\mathrm{.}126$

Errors in Subnet B:

Subnet mask should be $255\mathrm{.}255\mathrm{.}255\mathrm{.}192,$ not $255\mathrm{.}255\mathrm{.}255\mathrm{.}128.$

The network address is calculated correctly but is based on the wrong subnet mask, leading to confusion.

Host address and broadcast address would remain correct if recalculated with the proper subnet mask.

Conclusion:

Subnet B has more than one error related to subnet mask and network address calculations.

Uploaded image

ChatGPT

Let's analyze the broadcast addresses for the subnets in the new image to determine which one has an incorrect broadcast address.

Subnet A:

IP address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}75/28$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}240$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}65$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}79$

Validation:

Subnet mask $/28$ means $255\mathrm{.}255\mathrm{.}255\mathrm{.}240$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}64$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}79($correct$)$

Subnet A has the correct broadcast address.

Subnet B:

IP address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}124/27$

Subnet mask: $255\mathrm{.}255\mathrm{.}255\mathrm{.}224$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}96$

Host address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}100$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}95$

Validation:

Subnet mask $/27$ means $255\mathrm{.}255\mathrm{.}255\mathrm{.}224$

Network address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}96$

Broadcast address: $192\mathrm{.}168\mathrm{.}40\mathrm{.}127($the correct broadcast address should be $192\mathrm{.}168\mathrm{.}40\mathrm{.}127,$ not $192\mathrm{.}168\mathrm{.}40\mathrm{.}95)$

Subnet B has an incorrect broadcast address.

Subnet C:

IP address: $10\mathrm{.}15\mathrm{.}68\mathrm{.}66/14$

Subnet mask: $255\mathrm{.}252\mathrm{.}0\mathrm{.}0$

Network address: $10\mathrm{.}12\mathrm{.}0\mathrm{.}0$

Host address: $10\mathrm{.}11\mathrm{.}0\mathrm{.}1$

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