PART 7: NETWORK SECURITY

Protecting network information resources is necessary and urgent because:

• Computers are connected to networks

• Multiple users and physical distribution

• Protecting servers

• Preventing eavesdropping

Network security means ensuring the safety of:

• Network software

• Network resources

• Network hardware

• Data storage

A violation of information security means:

• Interfering with network operations

• Interfering with user activities

• Alteration of information content and flow

• Denial of service

Encryption is the process of transforming information from plaintext into:

• Encrypted form

• Denial of service form

• Denied access

• Unauthorized access

A firewall is a system that controls and prevents:

• Unauthorized external intrusions into the system

• Network resource usage

• Information access rights

• Espionage

A packet filter (implemented in a firewall) can:

• Allow only internal computers to initiate TCP connections to external computers

• Permit internal FTP clients to access external FTP servers without risking internal hacking

• Allow external FTP clients to access internal FTP servers without risking internal hacking

• All of the above

Authentication means:

• The sender encrypts the message, and the receiver decrypts it

• The sender and receiver recognize each other

• The sender and receiver ensure that the message is not altered

• Services are accessible and available to users

Message integrity means:

• The sender encrypts the message, and the receiver decrypts it

• The sender and receiver recognize each other

• The sender and receiver ensure that the message is not altered

• Services are accessible and available to users

DES (Data Encryption Standard) is used for:

• Symmetric key encryption

• Public key encryption

• Both symmetric and public key encryption

• None of the above

The RSA algorithm is used for:

• Symmetric key encryption

• Public key encryption

• Both symmetric and public key encryption

• None of the above