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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. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
Tunneling
IPSEC (aggressive mode)
ESP
2. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
DSA
MD5
Origin Auth (DH auth)
ISAKMP
3. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
3DES
hash-based message authentication codes (HMAC).
'IPSEC (phase1 -step1)'
Origin Auth (DH auth)
4. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
AH/ESP
Difffie-Hellman
ESP
3DES
5. It also provides protection for ISAKMP peer identities with encryption.
IPSEC (main mode)
Hashing
Difffie-Hellman
DES
6. 'Encryption - where Peer X uses Peer Y
RSA
hash-based message authentication codes (HMAC).
IPSEC (main mode)
Antireplay
7. IPSEC Encryption is performed by
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8. 'requires that the sender and receiver have key pairs. By combining the sender
Difffie-Hellman
3DES
IPSEC (phase2)
SHA
9. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
message authentication codes (MAC).
3DES
IPSEC BENEFIT
DES
10. That authenticate data packets and ensure that data is not tampered with or modified.
GRE
hash algorithms
IPSEC (main mode)
message authentication codes (MAC).
11. This mode does not support identity protection or protection against clogging attacks and spoofing.
Hashing
DES
IPSEC (aggressive mode)
ESP
12. The protocol of choice for key management and establishing security associations between peers on the Internet.
message authentication codes (MAC).
3DES
RSA
ISAKMP
13. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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14. 'When using the hash-based key function -'
AH
HMAC-MD5/HMAC-SHA
MD5
DSA
15. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
3DES
IPSEC (main mode)
AES
SHA
16. ' is defined in RFC 3174. has as output a 160-bit value -'
ESP
Antireplay
SHA
'IPSEC (phase1 -step2)'
17. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
RSA
Hashing
Tunneling
AH
18. Uses the D-H algorithm to come to agreement over a public network.
SHA
IKE
3DES
IPSEC (aggressive mode)
19. Used in government installs and was created to work with the SHA-1 hash algorithm.
IPSEC (aggressive mode)
AH
ISAKMP
DSA
20. 'in most cases - this mode is preferred with certificates.'
hash-based message authentication codes (HMAC).
IPSEC (aggressive mode)
Antireplay
IPSEC (main mode)
21. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
SHA
Origin Auth (DH auth)
SHA
Hashing
22. 'often called public-key algorithms - do not rely on a randomly generated shared encryption key; instead - they create two static keys. These static keys are completely different - but mathematically bound to each other; what one key encrypts - the o
AH
DES
Asymetric Encryption Protocols
message authentication codes (MAC).
23. Data integrity is the process of making sure data is not tampered with while it
ESP
AH/ESP
IPSEC BENEFIT
DES
24. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
IPSEC (aggressive mode)
3DES
Hashing
Difffie-Hellman
25. Can be implemented efficiently on a wide range of processors and in hardware.
IPSEC (aggressive mode)
MD5
AES
IKE
26. The receiving device then encrypts the data with the second key.
IKE
3DES
MD5
SHA
27. Uses protocol number 51.
AH
MD5
3DES
'IPSEC (phase1 -step2)'
28. '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
AH/ESP
HMAC-MD5/HMAC-SHA
RSA
Difffie-Hellman
29. 'MACs with hash algorithms -'
DES
hash-based message authentication codes (HMAC).
ISAKMP
ESP
30. '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.'
ESP
3DES
ISAKMP
DES
31. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
HMAC-MD5/HMAC-SHA
'IPSEC (phase1 -step3)'
AES
IKE
32. A variable block- length and key-length cipher.
AES
'DES - 3DES - or AES.'
'IPSEC (phase1 -step1)'
DES
33. Invented by Ron Rivest of RSA Security (RFC 1321).
MD5
Difffie-Hellman
IKE
ESP
34. 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.
IKE
DES
hash-based message authentication codes (HMAC).
Difffie-Hellman
35. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
AH/ESP
3DES
AH
IPSEC (aggressive mode)
36. More CPU intensive
HMAC-MD5/HMAC-SHA
AH
AH/ESP
SHA
37. '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.'
Difffie-Hellman
SHA
3DES
ISAKMP
38. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
ISAKMP
IPSEC (aggressive mode)
DES
39. A
'IPSEC (phase1 -step1)'
GRE
RSA
Hashing
40. 'Finally - the receiving devices decrypt the data with the first key.'
AES
3DES
AH
MD5
41. No additional Layer 3 header is created. The original Layer 3 header is used.
Difffie-Hellman
3DES
GRE
Transport Mode (Ipsec)
42. IPsec implements using a shim header between L2 and L3
IPSEC (main mode)
DSA
hash-based message authentication codes (HMAC).
AH/ESP
43. The DES algorithm that performs 3 times sequentially.
ISAKMP
IKE
RSA
3DES
44. Key exchange for IPSEC
3DES
3DES
'IPSEC (phase1 -step1)'
IKE
45. IPSEC tunnels data through IP using one of two protocols?
HMAC
AH/ESP
IKE
IPSEC (phase2)
46. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
'IPSEC (phase1 -step3)'
AH
DSA
HMAC
47. '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.'
DSA
RSA
Hashing
Transport Mode (Ipsec)
48. The sending device encrypts for a final time with another 56-bit key.
'DES - 3DES - or AES.'
MD5
3DES
IPSEC (aggressive mode)
49. Has a trailer which identifies IPsec information and ESP integrity-check information.
RSA
ESP
IPSEC (aggressive mode)
'MD5 - SHA-1 - or RSA'
50. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
IKE
'IPSEC (phase1 -step2)'
Transport Mode (Ipsec)
3DES