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 A firewall filter is a Junos security solution to filter or control traffic at the data plane as they enter or exit an interface 1 .  A firewall filter consists of one or more terms, each with a set of conditions and actions 2 .  The device evaluates every packet against the firewall filter terms in the order they are defined, and performs the actions specified in the first term that matches the packet 3 .  If no term matches the packet, the device discards the packet by default 3 .

In the exhibit, the firewall filter  mac-address  is applied to the  family ethernet-switching  and involves filtering MAC addresses. There are two terms,  term one  and  term two , each with different conditions and actions. The  from  statement specifies the match conditions, and the  then  statement specifies the actions.  If the  from  statement is omitted, all packets are considered to match and the actions in the  then  statement are taken 2 .  If the  then  statement is omitted, the packets that match the conditions in the  from  statement are accepted by default 2 .

Term one  logs traffic from a specific source MAC address  88:05:00:29:3c:de/48 .  The  log  action is a nonterminating action, which means that the device continues to evaluate the packet against the remaining terms in the filter 2 . Therefore, traffic that matches the  from  statement in term one is not discarded, and option A is incorrect.

Term two  accepts all other traffic not specified in term one.  The  then accept  action is a terminating action, which means that the device stops evaluating the packet against the filter and forwards the packet 2 . Therefore, all traffic not matching the  from  statement in term one is accepted by term two, and option D is correct.

Term two  does not have a  from  statement, which means that all packets are considered to match this term. Therefore, traffic matching the  from  statement in term two is not logged, and option B is incorrect.

Term one  does not have a  then  statement other than the  log  action, which means that the packets that match the  from  statement are accepted by default. Therefore, traffic that matches the  from  statement in term one is accepted, and option C is correct.