a) Do stateful packet inspection firewalls automatically do application content filtering? Explain. b) Do they have the

Question:

a) Do stateful packet inspection firewalls automatically do application content filtering? Explain.
b) Do they have the slow speed of relay operation?
c) What three advantages do application proxy firewalls have in protection that SPI firewalls with content inspection not have?
d) Why are SPI content filtering firewalls faster than application proxy firewalls?