Which Networks Match the Policy? (Answered)
Question
-- Exhibit --
[edit policy-options policy-statement my-policy]
user@router# show
term 1 {
from {
route-filter 192.168.0.0/16 prefix-length-range /20-/24;
}
then accept;
}
-- Exhibit --
Referring to the exhibit, which three networks match the policy? (Choose three.)
Answers
Explanations
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A. B. C. D. E.ADE
The policy statement shown in the exhibit is defining a term named "1" that matches a specific route filter and then applies an accept action.
The route filter specified in the "from" section of the term is "192.168.0.0/16 prefix-length-range /20-/24". This filter matches all routes that fall within the 192.168.0.0/16 address block and have a prefix length between 20 and 24 bits. This means that the policy will match any route in the 192.168.0.0/16 address block that has a subnet mask between /20 (255.255.240.0) and /24 (255.255.255.0).
Based on this information, the three networks that match the policy are:
A. 192.168.0.0/20 - This network falls within the 192.168.0.0/16 address block and has a prefix length of 20 bits, which falls within the specified prefix-length-range of /20-/24.
C. 192.168.128.0/18 - This network also falls within the 192.168.0.0/16 address block and has a prefix length of 18 bits, which falls outside the specified prefix-length-range of /20-/24. Therefore, this network does not match the policy.
D. 192.168.128.0/21 - This network also falls within the 192.168.0.0/16 address block and has a prefix length of 21 bits, which falls within the specified prefix-length-range of /20-/24.
E. 192.168.64.0/24 - This network also falls within the 192.168.0.0/16 address block but has a prefix length of 24 bits, which falls within the specified prefix-length-range of /20-/24.
Therefore, the three networks that match the policy are 192.168.0.0/20, 192.168.128.0/21, and 192.168.64.0/24.
