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Test your basic knowledge |
CCIE Sec Encryption Ipsec
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
ccie
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Does not provide payload encryption.
DES
AH
hash algorithms
'IPSEC (phase1 -step3)'
2. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
AES
Difffie-Hellman
AES
message authentication codes (MAC).
3. DoS attacks are more probable with this mode.
ESP
AH
DSA
IPSEC (aggressive mode)
4. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
IPSEC (main mode)
hash algorithms
MD5
Origin Auth (DH auth)
5. RFC 2631 on the workings of the key generation/exchange process.
Hashing
IKE
'IPSEC (phase1 -step1)'
Difffie-Hellman
6. IPSEC tunnels data through IP using one of two protocols?
ESP
AH/ESP
SHA
ESP
7. Where the original Layer 3 header and payload inside an IPsec packet is encapsulated. Tunnel mode does add overhead to each packet and uses some additional CPU resources.
3DES
Difffie-Hellman
AH
Tunnel Mode (ipsec)
8. Used for integrity checks on peer and data sent by peer and for authentication checks.
3DES
3DES
Asymetric Encryption Protocols
AH
9. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
IKE
IPSEC (main mode)
Difffie-Hellman
RSA/DSA
10. The DES algorithm that performs 3 times sequentially.
3DES
AH
RSA
Difffie-Hellman
11. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
12. Is a two-phase protocol: The first phase establishes a secure authenticated channel and the second phase is where SAs are negotiated on behalf of the IPsec services.
RSA
AES
IKE
AH/ESP
13. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
SHA
GRE
Difffie-Hellman
AH/ESP
14. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
IPSEC BENEFIT
Difffie-Hellman
3DES
DES
15. 'defines the mode of communication - creation - and management of security associations.'
ISAKMP
IPSEC (aggressive mode)
RSA
'MD5 - SHA-1 - or RSA'
16. The protocol of choice for key management and establishing security associations between peers on the Internet.
HMAC
'IPSEC (phase1 -step3)'
ISAKMP
Hashing
17. 'key exchange is vulnerable to a man-in-the-middle attack. You can rectify this problem by allowing the two parties to authenticate themselves to each other with a shared secret key - digital signatures - or public-key certificates.'
Difffie-Hellman
Origin Auth (DH auth)
IPSEC (main mode)
Transport Mode (Ipsec)
18. Integrity checks are done
19. A variable block- length and key-length cipher.
IKE
AES
Asymetric Encryption Protocols
GRE
20. Main disadvantage of asymmetric algorithms is that they are slow.
hash-based message authentication codes (HMAC).
3DES
Difffie-Hellman
RSA/DSA
21. Uses IKE for key exchange.
MD5
'IPSEC (phase1 -step1)'
Hashing
ISAKMP
22. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
DSA
3DES
ESP
RSA/DSA
23. It uses UDP 500 and is defined by RFC 2409.
HMAC-MD5/HMAC-SHA
ISAKMP
IKE
Hashing
24. 'is a block-cipher algorithm - which means that it performs operations on fixed-length data streams of 64-bit blocks. The key ostensibly consists of 64 bits; however - only 56 are actually used by the algorithm.'
DES
MD5
IPSEC (main mode)
Difffie-Hellman
25. The receiving device decrypts the data with the third key.
Antireplay
IKE
3DES
MD5
26. 'DSA is roughly the same speed as RSA when creating signatures - but 10 to 40 times slower when verifying signatures. Because verification happens more frequently than creation - this issue is worth noting when deploying DSA in any environment.'
Hashing
RSA
DES
DSA
27. Can be implemented efficiently on a wide range of processors and in hardware.
Difffie-Hellman
SHA
AES
IPSEC BENEFIT
28. It also provides protection for ISAKMP peer identities with encryption.
DSA
IKE
IPSEC (main mode)
Origin Auth (DH auth)
29. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
ISAKMP
Hashing
AH/ESP
'IPSEC (phase1 -step2)'
30. 'A 56-bit encryption algorithm - meaning the number of possible keys
ESP
HMAC
IPSEC
DES
31. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
DES
IKE
AES
3DES
32. Invented by Ron Rivest of RSA Security (RFC 1321).
AES
MD5
IPSEC (main mode)
Tunneling
33. Turns clear-text data into cipher text with an encryption algorithm. The receiving station decrypts the data from cipher text into clear text. The encryption key is a shared secret key that encrypts and decrypts messages.
AES
SHA
DES
Difffie-Hellman
34. Used in IPsec for two discreet purposes:
RSA
SHA
IKE
MD5
35. 'is a more secure version of MD5 - and hash-based message authentication codes (HMAC) provides further security with the inclusion of a key-based hash.'
SHA
RSA
IPSEC (aggressive mode)
Hashing
36. IPSec SAs are negotiated and protected by the existing IPsec SA.
MD5
IPSEC (phase2)
Difffie-Hellman
AH/ESP
37. Used in government installs and was created to work with the SHA-1 hash algorithm.
hash-based message authentication codes (HMAC).
IPSEC BENEFIT
DSA
3DES
38. 'Finally - the receiving devices decrypt the data with the first key.'
3DES
Difffie-Hellman
Tunnel Mode (ipsec)
Difffie-Hellman
39. IPSEC Encryption is performed by
40. The receiving device then encrypts the data with the second key.
3DES
IPSEC (main mode)
Tunnel Mode (ipsec)
MD5
41. Uses protocol number 51.
Difffie-Hellman
Difffie-Hellman
'MD5 - SHA-1 - or RSA'
AH
42. ' is defined in RFC 3174. has as output a 160-bit value -'
AH/ESP
AH
Tunneling
SHA
43. No additional Layer 3 header is created. The original Layer 3 header is used.
ISAKMP
'IPSEC (phase1 -step2)'
Asymetric Encryption Protocols
Transport Mode (Ipsec)
44. 'Message digest algorithms have a drawback whereby a hacker (man in the middle) can intercept a message containing the packet and hash values - then re-create and transmit a modified packet with the same calculated hash to the target destination.'
'IPSEC (phase1 -step2)'
DES
Hashing
ISAKMP
45. A
3DES
Hashing
SHA
MD5
46. 'provides everything required to securely connect over a public media - such as the Internet.'
hash-based message authentication codes (HMAC).
Difffie-Hellman
RSA
IPSEC
47. Key exchange for IPSEC
Difffie-Hellman
SHA
Hashing
IKE
48. Uses the D-H algorithm to come to agreement over a public network.
IPSEC BENEFIT
Asymetric Encryption Protocols
IPSEC (aggressive mode)
IKE
49. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
'IPSEC (phase1 -step1)'
message authentication codes (MAC).
ESP
50. 'When using the hash-based key function -'
HMAC-MD5/HMAC-SHA
IPSEC BENEFIT
message authentication codes (MAC).
AH