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Good Network

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.102

255.255.255.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

Duplicate IP Address

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

IP Address Outside Subnet

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.2.102

255.255.255.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

Wrong Subnet Mask

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.102

255.255.0.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

Wrong Default Gateway

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.102

255.255.255.0

192.168.1.101

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

Find the Problem #1

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.2.101

255.255.255.0

192.168.2.1

192.168.2.102

255.255.255.0

192.168.2.1

192.169.2.103

255.255.255.0

192.168.2.1

192.168.2.1

255.255.255.0

147.144.51.1

Find the Problem #2

192.168.1.101

255.255.255.255

192.168.1.1

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.102

255.255.255.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.1

255.255.255.0

147.144.51.1

Find the Problem #3

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.2.101

255.255.255.0

192.168.2.1

192.168.2.102

255.255.255.0

192.168.2.1

192.168.2.102

255.255.255.0

192.168.2.1

192.168.2.1

255.255.255.0

147.144.51.1

Find the Problem #4

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.0.101

255.255.255.0

192.168.2.1

192.168.0.102

255.255.255.0

192.168.0.1

192.168.0.103

255.255.255.0

192.168.0.1

192.168.0.1

255.255.255.0

147.144.51.1

Find the Problem #5

IP Address

Subnet Mask

Default Gateway

Hub

To the Internet

192.168.1.101

255.255.255.0

192.168.1.1

192.168.1.102

255.255.255.0

192.168.1.1

192.168.1.103

255.255.255.0

192.168.1.1

192.168.1.4

255.255.255.0

147.144.51.1

Answers

  • #1: IP address out of subnet on rightmost machine
  • #2: Bad subnet mask on leftmost machine
  • #3: Duplicate IP address on rightmost machine
  • #4: Bad default gateway on leftmost machine
  • #5: All the default gateways are wrong (or the top machine’s IP address is wrong)