Each incoming UDP packet is locked up in the list of pending connections. Packets are delivered if
they are _________.

A.
A request.

B.
A response to a request.

C.
Source routed.

D.
Allowed by the Rule Base.

E.
Both B and D.

Explanation:
when an UDP packets enters to the Inspect engine inside the firewall, the database that contains
the pending connections is reviewed and the packet is delivered if its a reply to a request, we
know this because there is an entry expecting the reply in the pending connections database, this
is the first case. The second case that allows the deliver of the UDP packet is if it is allowed by the
rulebase, for example, a rule that allows DNS Query traffic through port 53 UDP.
Incorrect Answers:
A: A request cannot pass the firewall unless there is a rulebase permitting that service.
B: This is only part of the correct answer. This is only 1 of the 2 cases.
C: Source routed request are not allowed unless there is a rule permitting it.
D: This is only part of the correct answer. This is only 1 of the 2 cases.