Securing TCP/IP

Question 1

Any encryption that uses the same key for encryption and decryption is called?

Encoded key

Symmetric key

Single key

Answer 1

Symmetric key

Symmetric-key encryption uses the same key

Question 2

RC4 is a(n) _______________ cipher.

forwarding

stream

asymmetric

Answer 2

stream

RC4 is a stream cipher

Question 3

In a PKI encryption method, which key encrypts the data?

Public

Private

Both

Answer 3

Public

You send someone a public key that he or she, in turn, uses to encrypt the data. The private key can decrypt data encrypted with the public key

Question 4

The process of verifying with a high degree of confidence that the sender is who the receiver thinks he or she should be is called _______________.

authentication

locking

nonrepudiation

Answer 4

nonrepudiation

This is the definition of nonrepudiation

Question 5

A hash function is by definition a _______________.

complex function

PKI function

one-way function

Answer 5

one-way function

Hash functions must be one-way. They should be complex, but complexity is not a requirement

Question 6

Which of the following is a common hash function?

SHA-3

RC4

AES

Answer 6

SHA-3

Of the choices listed, only SHA-3 is a hash function

Question 7

In order to have a PKI you must have a(n) _______________.

Web of trust

root authority

unsigned certificate

Answer 7

root authority

A PKI must have a root authority

Question 8

Which type of access control requires a label to define its sensitivity?

MAC

DAC

RBAC

Answer 8

MAC

Mandatory access control must use a label to define sensitivity

Question 9

If you saw some traffic running on UDP ports 1812 and 1813, what AAA standard would you know was running?

PPP

RADIUS

MS-CHAP

Answer 9

RADIUS

RADIUS uses UDP ports 1812 and 1813

Question 10

Which authentication standard is highly time sensitive?

RADIUS

802.1X

Kerberos

Answer 10

Kerberos

All Kerberos tickets are timestamped