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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. 'provides everything required to securely connect over a public media - such as the Internet.'
IKE
IPSEC BENEFIT
IPSEC
3DES
2. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
IPSEC (aggressive mode)
RSA
AES
IKE
3. Main disadvantage of asymmetric algorithms is that they are slow.
RSA/DSA
DSA
SHA
3DES
4. It also provides protection for ISAKMP peer identities with encryption.
Hashing
Difffie-Hellman
IPSEC (main mode)
DSA
5. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
SHA
'IPSEC (phase1 -step2)'
Difffie-Hellman
IKE
6. 'Encryption - where Peer X uses Peer Y
Difffie-Hellman
Hashing
RSA
Hashing
7. 'MACs with hash algorithms -'
hash-based message authentication codes (HMAC).
IPSEC (phase2)
IPSEC BENEFIT
3DES
8. The protocol of choice for key management and establishing security associations between peers on the Internet.
3DES
Hashing
ISAKMP
AES
9. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
'IPSEC (phase1 -step3)'
AES
RSA
SHA
10. '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.'
IPSEC BENEFIT
RSA
ISAKMP
3DES
11. Has a trailer which identifies IPsec information and ESP integrity-check information.
Transport Mode (Ipsec)
IPSEC BENEFIT
ESP
IPSEC (aggressive mode)
12. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
RSA/DSA
HMAC
Tunnel Mode (ipsec)
Origin Auth (DH auth)
13. Used for integrity checks on peer and data sent by peer and for authentication checks.
message authentication codes (MAC).
AH
Tunneling
'DES - 3DES - or AES.'
14. 'requires that the sender and receiver have key pairs. By combining the sender
Difffie-Hellman
Antireplay
ISAKMP
3DES
15. 'A 56-bit encryption algorithm - meaning the number of possible keys
DES
AH/ESP
IPSEC (aggressive mode)
GRE
16. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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17. Used in government installs and was created to work with the SHA-1 hash algorithm.
DSA
AH
3DES
ESP
18. The receiving device decrypts the data with the third key.
3DES
Hashing
IPSEC
IPSEC BENEFIT
19. Verify whether the data has been altered.
DES
Origin Auth (DH auth)
Hashing
Difffie-Hellman
20. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
IKE
Asymetric Encryption Protocols
IPSEC (aggressive mode)
21. IPSEC tunnels data through IP using one of two protocols?
HMAC-MD5/HMAC-SHA
hash algorithms
AH/ESP
IPSEC BENEFIT
22. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
DSA
IPSEC (main mode)
message authentication codes (MAC).
23. Used in IPsec for two discreet purposes:
IPSEC (aggressive mode)
MD5
ISAKMP
RSA
24. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
AH/ESP
3DES
SHA
RSA
25. The DES algorithm that performs 3 times sequentially.
AH
DSA
3DES
Difffie-Hellman
26. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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27. Invented by Ron Rivest of RSA Security (RFC 1321).
Difffie-Hellman
Difffie-Hellman
AH/ESP
MD5
28. 'in most cases - this mode is preferred with certificates.'
IPSEC
IPSEC (main mode)
hash-based message authentication codes (HMAC).
AH
29. A variable block- length and key-length cipher.
AES
AH/ESP
Difffie-Hellman
IPSEC (aggressive mode)
30. Integrity checks are done
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31. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
AH
IPSEC (main mode)
Difffie-Hellman
HMAC
32. No additional Layer 3 header is created. The original Layer 3 header is used.
AH
IPSEC
Transport Mode (Ipsec)
Difffie-Hellman
33. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
ESP
3DES
MD5
AH/ESP
34. That authenticate data packets and ensure that data is not tampered with or modified.
Asymetric Encryption Protocols
IKE
RSA
hash algorithms
35. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
DES
IPSEC (aggressive mode)
hash-based message authentication codes (HMAC).
'IPSEC (phase1 -step1)'
36. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
AES
3DES
MD5
DES
37. RFC 2631 on the workings of the key generation/exchange process.
ISAKMP
RSA
IPSEC (aggressive mode)
Difffie-Hellman
38. Uses IKE for key exchange.
'IPSEC (phase1 -step1)'
ISAKMP
ESP
'IPSEC (phase1 -step3)'
39. Can be implemented efficiently on a wide range of processors and in hardware.
SHA
RSA/DSA
AES
Difffie-Hellman
40. 'Digital signatures. Peer X encrypts a hash value with his private key and then sends the data to Peer Y. Peer Y obtains Peer X
IKE
RSA
'DES - 3DES - or AES.'
'IPSEC (phase1 -step2)'
41. DoS attacks are more probable with this mode.
3DES
Transport Mode (Ipsec)
hash algorithms
IPSEC (aggressive mode)
42. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
Difffie-Hellman
AH/ESP
SHA
IPSEC (aggressive mode)
43. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
Hashing
RSA
IKE
3DES
44. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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45. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
RSA/DSA
hash-based message authentication codes (HMAC).
RSA
message authentication codes (MAC).
46. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
IPSEC (aggressive mode)
AES
Transport Mode (Ipsec)
Antireplay
47. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
IKE
Difffie-Hellman
RSA
'IPSEC (phase1 -step3)'
48. 'When using the hash-based key function -'
HMAC-MD5/HMAC-SHA
Asymetric Encryption Protocols
IPSEC (aggressive mode)
'IPSEC (phase1 -step3)'
49. Data integrity is the process of making sure data is not tampered with while it
Tunnel Mode (ipsec)
IPSEC BENEFIT
DSA
RSA
50. '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.'
RSA/DSA
Difffie-Hellman
DES
Hashing