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CCIE Sec Encryption Ipsec

Subjects : cisco, it-skills, ccie
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'

2. Does not provide payload encryption.

3. 'requires that the sender and receiver have key pairs. By combining the sender

4. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.

5. Key exchange for IPSEC

6. Negotiation of the ISAKMP policy by offering and acceptance of protection suites

7. '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.'

8. '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.'

9. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm

10. The sending device encrypts for a final time with another 56-bit key.

11. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.

12. ' is defined in RFC 3174. has as output a 160-bit value -'

13. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'

14. '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.'

15. 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.

16. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'

17. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'

18. 'produces a 160-bit hash output - which makes it more difficult to decipher.'

19. RFC 2631 on the workings of the key generation/exchange process.

20. 'MACs with hash algorithms -'

21. One of the most popular tunneling protocols is

22. 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.

23. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.

24. The protocol of choice for key management and establishing security associations between peers on the Internet.

25. Can be implemented efficiently on a wide range of processors and in hardware.

26. 'defines the mode of communication - creation - and management of security associations.'

27. Negotiation of the ISAKMP policy by offering and acceptance of protection suites

28. Provides authentication and encryption of the payload.

29. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.

30. '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.'

31. No additional Layer 3 header is created. The original Layer 3 header is used.

32. DoS attacks are more probable with this mode.

33. That authenticate data packets and ensure that data is not tampered with or modified.

34. IPSEC tunnels data through IP using one of two protocols?

35. Uses protocol number 51.

36. Data integrity is the process of making sure data is not tampered with while it

37. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits

38. Integrity checks are done

39. Uses IKE for key exchange.

40. The receiving device then encrypts the data with the second key.

41. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'

42. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'

43. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'

44. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).

45. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'

46. IPsec implements using a shim header between L2 and L3

47. IPSec SAs are negotiated and protected by the existing IPsec SA.

48. Provide authentication in Internet Key Exchange (IKE) Phase 2.

49. Used in IPsec for two discreet purposes:

50. Invented by Ron Rivest of RSA Security (RFC 1321).