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  1. Your router has the following IP address on Ethernet0: 172.16.2.1/23. Which of the following can be valid host IDs on the LAN interface attached to the router?
    1. 172.16.1.100
    2. 172.16.1.198
    3. 172.16.2.255
    4. 172.16.3.0

    2. A.

     1 only
    B.

     2 and 3 only
    C.

     3 and 4 only
    D.

     None of the above
    E.

     2 and 5 only

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    Answer : Option C

    Explanation :

    The router's IP address on the E0 interface is 172.16.2.1/23, which is 255.255.254.0. This makes the third octet a block size of 2. The router's interface is in the 2.0 subnet, and the broadcast address is 3.255 because the next subnet is 4.0. The valid host range is 2.1 through 3.254. The router is using the first valid host address in the range.

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