What are two valid address books? (Choose two.)
What are two valid address books? (Choose two.)
Valid address books are identified with network addresses in the prefix/length format. The addresses should match the given subnet. 66.129.239.128/25 and 66.129.239.0/24 both represent valid network prefixes that correspond with their respective subnet masks. Address 66.129.239.154/24 is not valid because the specific host (154) must be zero if using /24 subnet. Similarly, 66.129.239.50/25 is also valid since it fits within the subnet range provided by its mask.
https://www.juniper.net/documentation/us/en/software/junos/security-policies/topics/topic-map/security-address-books-sets.html
Can a moderator correct the answer?
It’s AC Valid address books are identified with network addresses
Network Prefixes in Address Books You can specify addresses as network prefixes in the prefix/length format. For example, 203.0.113.0/24 is an acceptable address book address because it translates to a network prefix. However, 203.0.113.4/24 is not acceptable for an address book because it exceeds the subnet length of 24 bits. Everything beyond the subnet length must be entered as 0 (zero). In special scenarios, you can enter a hostname because it can use the full 32-bit address length. https://www.juniper.net/documentation/us/en/software/junos/security-policies/topics/topic-map/security-address-books-sets.html
Answer : AC
A - correct B- exceeds the /24 C-correct D- it belongs to the zero subnet 0-128