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CCIE Sec Encryption Ipsec

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. One of the most popular tunneling protocols is






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






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






4. It also provides protection for ISAKMP peer identities with encryption.






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






6. Uses protocol number 50.






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

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






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






10. Used for integrity checks on peer and data sent by peer and for authentication checks.






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






12. 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.






13. Verify whether the data has been altered.






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






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






16. Used in IPsec for two discreet purposes:






17. 'When using the hash-based key function -'






18. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'






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






20. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret






21. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.






22. This mode does not support identity protection or protection against clogging attacks and spoofing.






23. More CPU intensive






24. The DES algorithm that performs 3 times sequentially.






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






26. '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.'






27. '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






28. 'Digital signatures. Peer X encrypts a hash value with his private key and then sends the data to Peer Y. Peer Y obtains Peer X






29. 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.






30. The receiving device decrypts the data with the third key.






31. 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.






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






33. 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.






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






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






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






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






38. Provides authentication and encryption of the payload.






39. Uses IKE for key exchange.






40. Key exchange for IPSEC






41. 'Finally - the receiving devices decrypt the data with the first key.'






42. 'A 56-bit encryption algorithm - meaning the number of possible keys






43. Common key size is 1024 bits.






44. Uses protocol number 51.






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






46. IPSEC Encryption is performed by

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47. Integrity checks are done

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

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49. '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.'






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

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