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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).
'IPSEC (phase1 -step2)'
IKE
Difffie-Hellman
HMAC-MD5/HMAC-SHA
2. More CPU intensive
Origin Auth (DH auth)
ISAKMP
3DES
SHA
3. Key exchange for IPSEC
IKE
ISAKMP
Tunnel Mode (ipsec)
Hashing
4. 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.
AH
hash algorithms
3DES
Asymetric Encryption Protocols
5. IPSec SAs are negotiated and protected by the existing IPsec SA.
Hashing
IPSEC (phase2)
AES
IPSEC
6. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
IPSEC BENEFIT
DSA
Hashing
3DES
7. Verify whether the data has been altered.
Hashing
DES
DSA
DSA
8. 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.
RSA
3DES
DES
IKE
9. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
IPSEC (aggressive mode)
hash algorithms
RSA
Difffie-Hellman
10. The sending device encrypts for a final time with another 56-bit key.
IPSEC (aggressive mode)
IPSEC (phase2)
3DES
IPSEC (aggressive mode)
11. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
ISAKMP
Difffie-Hellman
SHA
Hashing
12. 'MACs with hash algorithms -'
ESP
'DES - 3DES - or AES.'
HMAC
hash-based message authentication codes (HMAC).
13. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
'IPSEC (phase1 -step2)'
Asymetric Encryption Protocols
Antireplay
RSA
14. That authenticate data packets and ensure that data is not tampered with or modified.
hash algorithms
3DES
3DES
AES
15. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
HMAC
'DES - 3DES - or AES.'
MD5
DES
16. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
AH
Origin Auth (DH auth)
Difffie-Hellman
MD5
17. '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
3DES
3DES
IPSEC (main mode)
18. Common key size is 1024 bits.
Hashing
RSA
DES
3DES
19. RFC 2631 on the workings of the key generation/exchange process.
DES
Hashing
Difffie-Hellman
ISAKMP
20. '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.'
IPSEC
Difffie-Hellman
Tunneling
Antireplay
21. '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.'
DES
DSA
IPSEC (aggressive mode)
Tunnel Mode (ipsec)
22. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
Asymetric Encryption Protocols
IKE
AH/ESP
3DES
23. No additional Layer 3 header is created. The original Layer 3 header is used.
IPSEC (phase2)
RSA
RSA
Transport Mode (Ipsec)
24. IPSEC Encryption is performed by
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25. The receiving device then encrypts the data with the second key.
3DES
RSA
'IPSEC (phase1 -step3)'
hash algorithms
26. IPsec implements using a shim header between L2 and L3
IKE
IPSEC (main mode)
AH/ESP
3DES
27. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
HMAC
IPSEC
SHA
Difffie-Hellman
28. Does not provide payload encryption.
IPSEC (main mode)
AH
DSA
AH/ESP
29. Invented by Ron Rivest of RSA Security (RFC 1321).
MD5
Hashing
ISAKMP
DSA
30. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
IPSEC (main mode)
Tunneling
Hashing
Asymetric Encryption Protocols
31. 'A 56-bit encryption algorithm - meaning the number of possible keys
DES
HMAC
Origin Auth (DH auth)
Difffie-Hellman
32. 'defines the mode of communication - creation - and management of security associations.'
DES
IPSEC (phase2)
ISAKMP
RSA
33. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
SHA
3DES
IKE
MD5
34. 'When using the hash-based key function -'
3DES
Hashing
Difffie-Hellman
HMAC-MD5/HMAC-SHA
35. 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.
HMAC-MD5/HMAC-SHA
Tunnel Mode (ipsec)
3DES
'IPSEC (phase1 -step1)'
36. Provides authentication and encryption of the payload.
'MD5 - SHA-1 - or RSA'
3DES
IKE
ESP
37. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
3DES
AES
IPSEC (main mode)
hash algorithms
38. 'Encryption - where Peer X uses Peer Y
Difffie-Hellman
Difffie-Hellman
RSA
Asymetric Encryption Protocols
39. Used for integrity checks on peer and data sent by peer and for authentication checks.
Hashing
AH
HMAC
AES
40. '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.'
SHA
3DES
hash algorithms
'IPSEC (phase1 -step2)'
41. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
Difffie-Hellman
3DES
Difffie-Hellman
Difffie-Hellman
42. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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43. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
Tunneling
hash-based message authentication codes (HMAC).
AH/ESP
ESP
44. A variable block- length and key-length cipher.
RSA
AH/ESP
3DES
AES
45. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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46. It uses UDP 500 and is defined by RFC 2409.
IKE
Asymetric Encryption Protocols
HMAC-MD5/HMAC-SHA
3DES
47. It also provides protection for ISAKMP peer identities with encryption.
ISAKMP
'IPSEC (phase1 -step1)'
IPSEC (main mode)
'IPSEC (phase1 -step2)'
48. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
Asymetric Encryption Protocols
3DES
RSA
IPSEC BENEFIT
49. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
Origin Auth (DH auth)
IKE
MD5
AES
50. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
Tunneling
Difffie-Hellman
RSA
Antireplay