Which of the following items can be done by firewalls? a points Detecting viruses Blocking external services Reading encrypted payloads Logging server utilizations Allowing internal services for certain source Ps Which of the following items can be done by Host Based IDSes? a points Monitoring memory usage Blocking unautorized traffic Denying illegal service requests Producing alerts for abnormal usage Checking array boundaries Option 6 Single key encryption systems a poims uses two keys: one public on private. slower than public key systems can be used for block based encryption can be used for authentication can be used for digital signatures the algorithm used has to be kept secret strength of the ecryption depends on key size