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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. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
Hashing
Difffie-Hellman
AH/ESP
3DES
2. Data integrity is the process of making sure data is not tampered with while it
MD5
AES
IPSEC BENEFIT
IPSEC (aggressive mode)
3. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
RSA
Hashing
Difffie-Hellman
4. Act of encapsulating a packet within another packet.
ESP
IPSEC BENEFIT
Tunneling
'MD5 - SHA-1 - or RSA'
5. '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.'
MD5
3DES
DSA
ISAKMP
6. Does not provide payload encryption.
AH
Difffie-Hellman
Hashing
AH/ESP
7. Uses protocol number 51.
AH
Difffie-Hellman
IKE
RSA
8. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
IPSEC BENEFIT
'DES - 3DES - or AES.'
Hashing
DSA
9. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
AH
Hashing
IPSEC (main mode)
3DES
10. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
AH
3DES
Origin Auth (DH auth)
IPSEC (phase2)
11. 'MACs with hash algorithms -'
ISAKMP
hash algorithms
hash-based message authentication codes (HMAC).
GRE
12. Used in IPsec for two discreet purposes:
IKE
Difffie-Hellman
ISAKMP
RSA
13. 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.
IKE
ESP
Hashing
DES
14. Invented by Ron Rivest of RSA Security (RFC 1321).
AES
ESP
IPSEC
MD5
15. This mode does not support identity protection or protection against clogging attacks and spoofing.
IPSEC (aggressive mode)
MD5
message authentication codes (MAC).
'DES - 3DES - or AES.'
16. Provide authentication in Internet Key Exchange (IKE) Phase 2.
AH
hash-based message authentication codes (HMAC).
IPSEC
HMAC
17. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
SHA
Tunneling
IPSEC (main mode)
'DES - 3DES - or AES.'
18. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
AH/ESP
IPSEC BENEFIT
Hashing
IKE
19. Uses protocol number 50.
Antireplay
ESP
3DES
3DES
20. '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.'
'IPSEC (phase1 -step2)'
hash-based message authentication codes (HMAC).
Difffie-Hellman
SHA
21. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
IPSEC (main mode)
DES
MD5
RSA
22. 'defines the mode of communication - creation - and management of security associations.'
IKE
MD5
ISAKMP
3DES
23. IPSEC Encryption is performed by
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24. RFC 2631 on the workings of the key generation/exchange process.
DSA
ESP
Difffie-Hellman
3DES
25. The protocol of choice for key management and establishing security associations between peers on the Internet.
ESP
ISAKMP
AH/ESP
Difffie-Hellman
26. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
IPSEC (aggressive mode)
ESP
AES
IKE
27. 'When using the hash-based key function -'
HMAC-MD5/HMAC-SHA
HMAC
IKE
Tunnel Mode (ipsec)
28. The receiving device decrypts the data with the third key.
GRE
3DES
Difffie-Hellman
SHA
29. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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30. That authenticate data packets and ensure that data is not tampered with or modified.
3DES
Asymetric Encryption Protocols
hash algorithms
Difffie-Hellman
31. Uses the D-H algorithm to come to agreement over a public network.
IKE
MD5
3DES
IPSEC (main mode)
32. 'A 56-bit encryption algorithm - meaning the number of possible keys
'IPSEC (phase1 -step2)'
Origin Auth (DH auth)
DES
IPSEC BENEFIT
33. The DES algorithm that performs 3 times sequentially.
IKE
MD5
DSA
3DES
34. More CPU intensive
SHA
MD5
ESP
Difffie-Hellman
35. 'requires that the sender and receiver have key pairs. By combining the sender
Origin Auth (DH auth)
Difffie-Hellman
Antireplay
IPSEC (main mode)
36. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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37. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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38. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
Tunneling
message authentication codes (MAC).
Tunnel Mode (ipsec)
IPSEC BENEFIT
39. Provides authentication and encryption of the payload.
AES
IPSEC (aggressive mode)
hash algorithms
ESP
40. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
'IPSEC (phase1 -step1)'
IPSEC (aggressive mode)
Hashing
Antireplay
41. Used in government installs and was created to work with the SHA-1 hash algorithm.
AH
AH/ESP
ISAKMP
DSA
42. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
MD5
IKE
'IPSEC (phase1 -step1)'
AH/ESP
43. No additional Layer 3 header is created. The original Layer 3 header is used.
Origin Auth (DH auth)
Transport Mode (Ipsec)
3DES
ISAKMP
44. ' is defined in RFC 3174. has as output a 160-bit value -'
RSA
IPSEC (aggressive mode)
IPSEC (main mode)
SHA
45. Common key size is 1024 bits.
RSA
AH/ESP
IKE
ESP
46. A
Hashing
MD5
Difffie-Hellman
RSA/DSA
47. Verify whether the data has been altered.
IKE
AH/ESP
Hashing
IPSEC (main mode)
48. Main disadvantage of asymmetric algorithms is that they are slow.
Difffie-Hellman
RSA/DSA
AH/ESP
DSA
49. The sending device encrypts for a final time with another 56-bit key.
SHA
AH/ESP
Difffie-Hellman
3DES
50. 'Three keys encrypt the data - which results in a 168-bit encryption key. The sending device encrypts the data with the first 56-bit key.'
3DES
MD5
AES
IKE