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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. Uses protocol number 51.
AH
ESP
hash algorithms
3DES
2. Used for integrity checks on peer and data sent by peer and for authentication checks.
Hashing
IKE
IPSEC BENEFIT
AH
3. 'MACs with hash algorithms -'
hash-based message authentication codes (HMAC).
DSA
Antireplay
Difffie-Hellman
4. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
AES
Antireplay
IPSEC (main mode)
IKE
5. Used in government installs and was created to work with the SHA-1 hash algorithm.
DSA
RSA
'MD5 - SHA-1 - or RSA'
DES
6. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
'IPSEC (phase1 -step1)'
3DES
Difffie-Hellman
AH/ESP
7. '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
RSA
Asymetric Encryption Protocols
IPSEC (main mode)
IPSEC BENEFIT
8. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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9. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
ISAKMP
3DES
RSA
Hashing
10. Integrity checks are done
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11. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
ISAKMP
AES
RSA
Transport Mode (Ipsec)
12. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
MD5
Asymetric Encryption Protocols
ISAKMP
DSA
13. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
message authentication codes (MAC).
MD5
Origin Auth (DH auth)
Difffie-Hellman
14. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
RSA
Hashing
IKE
15. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
ISAKMP
Difffie-Hellman
Antireplay
IPSEC (phase2)
16. This mode does not support identity protection or protection against clogging attacks and spoofing.
DES
AH
IPSEC (aggressive mode)
RSA/DSA
17. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
RSA
'DES - 3DES - or AES.'
Antireplay
3DES
18. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
IPSEC (aggressive mode)
3DES
Antireplay
Tunneling
19. Does not provide payload encryption.
AES
AES
AH
IPSEC BENEFIT
20. RFC 2631 on the workings of the key generation/exchange process.
Difffie-Hellman
HMAC-MD5/HMAC-SHA
'IPSEC (phase1 -step2)'
IKE
21. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
3DES
'MD5 - SHA-1 - or RSA'
3DES
IPSEC (aggressive mode)
22. 'A 56-bit encryption algorithm - meaning the number of possible keys
DSA
DES
IKE
DSA
23. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (aggressive mode)
AH/ESP
Asymetric Encryption Protocols
IPSEC (main mode)
24. The sending device encrypts for a final time with another 56-bit key.
Difffie-Hellman
SHA
IKE
3DES
25. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
Difffie-Hellman
IPSEC (main mode)
IKE
IPSEC (main mode)
26. 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.
'IPSEC (phase1 -step1)'
DES
'IPSEC (phase1 -step2)'
IPSEC (aggressive mode)
27. Verify whether the data has been altered.
HMAC
DES
IPSEC (aggressive mode)
Hashing
28. Uses IKE for key exchange.
IPSEC (aggressive mode)
ISAKMP
DES
3DES
29. One of the most popular tunneling protocols is
AH/ESP
GRE
3DES
Tunneling
30. IPSEC Encryption is performed by
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31. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
RSA/DSA
AH/ESP
Transport Mode (Ipsec)
Hashing
32. 'Finally - the receiving devices decrypt the data with the first key.'
Difffie-Hellman
IPSEC BENEFIT
3DES
IPSEC (aggressive mode)
33. Act of encapsulating a packet within another packet.
hash-based message authentication codes (HMAC).
Tunneling
3DES
ISAKMP
34. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
AH/ESP
Transport Mode (Ipsec)
IPSEC (aggressive mode)
SHA
35. Key exchange for IPSEC
IKE
Difffie-Hellman
DES
SHA
36. No additional Layer 3 header is created. The original Layer 3 header is used.
'MD5 - SHA-1 - or RSA'
3DES
Transport Mode (Ipsec)
ISAKMP
37. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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38. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
Difffie-Hellman
hash-based message authentication codes (HMAC).
RSA
MD5
39. IPSEC tunnels data through IP using one of two protocols?
Origin Auth (DH auth)
3DES
DSA
AH/ESP
40. 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.
ESP
IKE
AH/ESP
Difffie-Hellman
41. A
RSA
Tunnel Mode (ipsec)
Difffie-Hellman
Hashing
42. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
IPSEC (main mode)
ESP
3DES
IPSEC (aggressive mode)
43. '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.'
HMAC-MD5/HMAC-SHA
SHA
3DES
AH/ESP
44. Has a trailer which identifies IPsec information and ESP integrity-check information.
RSA
3DES
'DES - 3DES - or AES.'
ESP
45. ' is defined in RFC 3174. has as output a 160-bit value -'
IKE
SHA
AH
Hashing
46. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
message authentication codes (MAC).
IPSEC (main mode)
SHA
'IPSEC (phase1 -step2)'
47. 'in most cases - this mode is preferred with certificates.'
Asymetric Encryption Protocols
IPSEC (main mode)
IPSEC (aggressive mode)
AH
48. '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.'
MD5
Difffie-Hellman
3DES
DES
49. That authenticate data packets and ensure that data is not tampered with or modified.
Hashing
Tunneling
AH
hash algorithms
50. IPsec implements using a shim header between L2 and L3
AES
IPSEC (aggressive mode)
AH/ESP
ESP