Packet-filtering firewalls a. can filter data based on ...

[Beheh]

Packet-filtering firewalls
 
  a. can filter data based on destination address
  b. can filter data based on source address
  c. can filter data based on data type
  d. all of the above

Question 2

Closed user groups
 
  a. require call-back devices to operate
  b. allow a secure network within a public packet data network
  c. offer special error checking functions for certain users
  d. are not more secure than a dial-up phone connection

[sabina576]

Answer to Question 1

d

Answer to Question 2

b