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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. 'in most cases - this mode is preferred with certificates.'
IPSEC (main mode)
IPSEC BENEFIT
Origin Auth (DH auth)
AES
2. Uses IKE for key exchange.
ISAKMP
IPSEC (aggressive mode)
IPSEC
IPSEC (aggressive mode)
3. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
DES
3DES
AH/ESP
4. Uses protocol number 50.
ISAKMP
SHA
Difffie-Hellman
ESP
5. '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.'
3DES
DES
AH
Asymetric Encryption Protocols
6. Does not provide payload encryption.
AH
Difffie-Hellman
IKE
ESP
7. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
3DES
Difffie-Hellman
Transport Mode (Ipsec)
message authentication codes (MAC).
8. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
DSA
IKE
DES
SHA
9. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IPSEC (phase2)
AH
IPSEC BENEFIT
IKE
10. 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
3DES
GRE
HMAC
11. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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12. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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13. DoS attacks are more probable with this mode.
Difffie-Hellman
IPSEC (aggressive mode)
SHA
DSA
14. RFC 2631 on the workings of the key generation/exchange process.
'IPSEC (phase1 -step2)'
Difffie-Hellman
IKE
AES
15. IPSEC tunnels data through IP using one of two protocols?
Asymetric Encryption Protocols
IPSEC (main mode)
AH/ESP
RSA
16. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
SHA
ESP
Difffie-Hellman
AH/ESP
17. No additional Layer 3 header is created. The original Layer 3 header is used.
AES
Transport Mode (Ipsec)
IPSEC (aggressive mode)
hash algorithms
18. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
Tunneling
Hashing
Difffie-Hellman
MD5
19. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
IKE
ESP
AH/ESP
hash-based message authentication codes (HMAC).
20. Uses protocol number 51.
AH
message authentication codes (MAC).
IPSEC (main mode)
3DES
21. Where the original Layer 3 header and payload inside an IPsec packet is encapsulated. Tunnel mode does add overhead to each packet and uses some additional CPU resources.
IPSEC (main mode)
ISAKMP
IKE
Tunnel Mode (ipsec)
22. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC (main mode)
IPSEC
Hashing
ESP
23. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
DSA
IKE
RSA
Antireplay
24. A
MD5
SHA
AES
Hashing
25. Has a trailer which identifies IPsec information and ESP integrity-check information.
Difffie-Hellman
AES
MD5
ESP
26. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
'IPSEC (phase1 -step3)'
IPSEC (main mode)
SHA
Difffie-Hellman
27. '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.'
hash-based message authentication codes (HMAC).
3DES
HMAC-MD5/HMAC-SHA
SHA
28. Can be implemented efficiently on a wide range of processors and in hardware.
SHA
Antireplay
AES
DES
29. A variable block- length and key-length cipher.
ISAKMP
3DES
AES
3DES
30. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
IPSEC BENEFIT
Asymetric Encryption Protocols
IKE
Tunneling
31. Integrity checks are done
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32. 'key exchange is vulnerable to a man-in-the-middle attack. You can rectify this problem by allowing the two parties to authenticate themselves to each other with a shared secret key - digital signatures - or public-key certificates.'
DES
AES
Difffie-Hellman
3DES
33. This mode does not support identity protection or protection against clogging attacks and spoofing.
Difffie-Hellman
3DES
AES
IPSEC (aggressive mode)
34. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
HMAC-MD5/HMAC-SHA
RSA
IKE
IPSEC (aggressive mode)
35. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
Asymetric Encryption Protocols
IPSEC (main mode)
hash-based message authentication codes (HMAC).
SHA
36. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
SHA
Hashing
Difffie-Hellman
IPSEC (main mode)
37. Act of encapsulating a packet within another packet.
'DES - 3DES - or AES.'
SHA
Tunneling
hash-based message authentication codes (HMAC).
38. Provides authentication and encryption of the payload.
ESP
IPSEC (main mode)
'MD5 - SHA-1 - or RSA'
HMAC
39. More CPU intensive
SHA
IPSEC (aggressive mode)
ISAKMP
IPSEC BENEFIT
40. '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.'
DSA
Difffie-Hellman
SHA
3DES
41. Invented by Ron Rivest of RSA Security (RFC 1321).
MD5
AES
DES
AES
42. ' is defined in RFC 3174. has as output a 160-bit value -'
RSA
IPSEC BENEFIT
IPSEC (main mode)
SHA
43. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
DES
IKE
ISAKMP
Difffie-Hellman
44. 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.
3DES
IPSEC BENEFIT
IKE
IPSEC (aggressive mode)
45. Used for integrity checks on peer and data sent by peer and for authentication checks.
DES
hash-based message authentication codes (HMAC).
AH
IPSEC (aggressive mode)
46. Used in IPsec for two discreet purposes:
ISAKMP
RSA
AES
DES
47. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
ISAKMP
'IPSEC (phase1 -step3)'
IPSEC (aggressive mode)
3DES
48. It also provides protection for ISAKMP peer identities with encryption.
SHA
hash-based message authentication codes (HMAC).
IPSEC (main mode)
SHA
49. Key exchange for IPSEC
RSA
3DES
IKE
IPSEC BENEFIT
50. The receiving device then encrypts the data with the second key.
Tunneling
3DES
Difffie-Hellman
ISAKMP