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Test your basic knowledge |
CCIE Sec Encryption Ipsec
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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 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
'IPSEC (phase1 -step2)'
AH/ESP
Difffie-Hellman
MD5
2. The sending device encrypts for a final time with another 56-bit key.
DES
MD5
IPSEC (aggressive mode)
3DES
3. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
ESP
3DES
ISAKMP
4. 'defines the mode of communication - creation - and management of security associations.'
DSA
ISAKMP
RSA/DSA
IPSEC (main mode)
5. You use this encryption method by keeping one key private and giving the other key to anyone in the public Internet. It does not matter who has your public key; it is useless without the private key.
Tunneling
Asymetric Encryption Protocols
IPSEC BENEFIT
RSA
6. Main disadvantage of asymmetric algorithms is that they are slow.
RSA/DSA
ISAKMP
ESP
Asymetric Encryption Protocols
7. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
IKE
AH/ESP
Difffie-Hellman
3DES
8. '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
MD5
Asymetric Encryption Protocols
Tunnel Mode (ipsec)
ISAKMP
9. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
IPSEC BENEFIT
DES
3DES
AES
10. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
IPSEC (main mode)
3DES
Difffie-Hellman
IKE
11. Uses the D-H algorithm to come to agreement over a public network.
IKE
IPSEC (aggressive mode)
AES
Tunneling
12. IPSEC tunnels data through IP using one of two protocols?
IPSEC (aggressive mode)
GRE
ESP
AH/ESP
13. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
RSA
hash algorithms
3DES
3DES
14. Data integrity is the process of making sure data is not tampered with while it
IPSEC (main mode)
IPSEC BENEFIT
AES
RSA
15. IPsec implements using a shim header between L2 and L3
IPSEC (main mode)
AH/ESP
DSA
DSA
16. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
'DES - 3DES - or AES.'
IPSEC (main mode)
DSA
RSA
17. A
DSA
Asymetric Encryption Protocols
HMAC
Hashing
18. That authenticate data packets and ensure that data is not tampered with or modified.
AH
hash algorithms
HMAC
DES
19. Used in IPsec for two discreet purposes:
Difffie-Hellman
Asymetric Encryption Protocols
RSA
IPSEC BENEFIT
20. Has a trailer which identifies IPsec information and ESP integrity-check information.
AH/ESP
IPSEC (aggressive mode)
Transport Mode (Ipsec)
ESP
21. RFC 2631 on the workings of the key generation/exchange process.
3DES
DSA
IKE
Difffie-Hellman
22. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
SHA
ESP
RSA
'IPSEC (phase1 -step1)'
23. Key exchange for IPSEC
Difffie-Hellman
Difffie-Hellman
IKE
Origin Auth (DH auth)
24. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
DSA
3DES
Hashing
AH
25. ' is defined in RFC 3174. has as output a 160-bit value -'
SHA
Antireplay
MD5
HMAC
26. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
DSA
ESP
IPSEC (aggressive mode)
IPSEC (main mode)
27. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
Difffie-Hellman
Origin Auth (DH auth)
IPSEC BENEFIT
SHA
28. This mode does not support identity protection or protection against clogging attacks and spoofing.
SHA
Difffie-Hellman
AH
IPSEC (aggressive mode)
29. 'in most cases - this mode is preferred with certificates.'
Difffie-Hellman
ESP
MD5
IPSEC (main mode)
30. 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)
Difffie-Hellman
IPSEC (aggressive mode)
MD5
31. One of the most popular tunneling protocols is
GRE
IPSEC (main mode)
IKE
RSA
32. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
IPSEC BENEFIT
3DES
Difffie-Hellman
IPSEC (aggressive mode)
33. The receiving device decrypts the data with the third key.
3DES
DES
IKE
Tunnel Mode (ipsec)
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.
Difffie-Hellman
'IPSEC (phase1 -step1)'
IKE
RSA
35. 'A 56-bit encryption algorithm - meaning the number of possible keys
3DES
Hashing
DES
3DES
36. It also provides protection for ISAKMP peer identities with encryption.
Antireplay
IPSEC (main mode)
3DES
3DES
37. The protocol of choice for key management and establishing security associations between peers on the Internet.
Difffie-Hellman
Tunnel Mode (ipsec)
DSA
ISAKMP
38. Provide authentication in Internet Key Exchange (IKE) Phase 2.
IKE
Difffie-Hellman
HMAC
3DES
39. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
IPSEC (aggressive mode)
IPSEC (main mode)
3DES
AES
40. Invented by Ron Rivest of RSA Security (RFC 1321).
MD5
IPSEC BENEFIT
Difffie-Hellman
hash-based message authentication codes (HMAC).
41. Used for integrity checks on peer and data sent by peer and for authentication checks.
AH
IPSEC (main mode)
3DES
IPSEC BENEFIT
42. 'requires that the sender and receiver have key pairs. By combining the sender
Difffie-Hellman
ISAKMP
IKE
HMAC-MD5/HMAC-SHA
43. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
DSA
3DES
Difffie-Hellman
Origin Auth (DH auth)
44. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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45. 'provides everything required to securely connect over a public media - such as the Internet.'
AH
3DES
AH/ESP
IPSEC
46. A variable block- length and key-length cipher.
MD5
RSA
3DES
AES
47. Common key size is 1024 bits.
HMAC
SHA
MD5
RSA
48. The DES algorithm that performs 3 times sequentially.
RSA/DSA
HMAC
3DES
Antireplay
49. Provides authentication and encryption of the payload.
RSA
ESP
Difffie-Hellman
RSA
50. '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.'
Hashing
IKE
MD5
MD5
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