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Question 48 10 pts Row Mask (/Prefix) Interface Destination Network or Subnet Metric (Cost) Next- Hop Router 128.171.0.0 47 2

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Answer #1

Given,

Destination IP address: 128.171.17.5

Anding with Subnet mask gives destination network or subnet.

ANDing with 255.255.0.0 (/16)

10000000.10101011.00010001 .00000101 ==>128.171.17.5

11111111.11111111.00000000.00000000 ==>255.255.0.0

------------------------------

10000000.10101011.00000000.00000000 ==>128.171.0.0

------------------------------

ANDing with 255.255.255.0 (/24)

10000000.10101011.00010001 .00000101 ==>128.171.17.5

11111111.11111111.11111111.00000000 ==>255.255.255.0

------------------------------

10000000.10101011.00010001 .00000000 ==>128.171.17.0

------------------------------

ANDing with 255.0.0.0 (/8)

10000000.10101011.00010001 .00000101 ==>128.171.17.5

11111111.00000000.00000000.00000000 ==>255.0.0.0

------------------------------

10000000.00000000.00000000.00000000 ==>128.0.0.0

------------------------------

Therefore, It matches with the following destination networks:

  • 128.171.0.0
  • 128.171.17.0

Hence, Router will choose interface 3 and route the packet to destination address or subnet 128.171.17.0 because it has the longest prefix match with it compared to 128.17.0.0

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