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






2. 'provides everything required to securely connect over a public media - such as the Internet.'






3. Uses protocol number 50.






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

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5. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'






6. '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






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






8. IPSEC Encryption is performed by

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9. '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.'






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






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






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






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






14. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'






15. Provides authentication and encryption of the payload.






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






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






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






19. DoS attacks are more probable with this mode.






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






21. '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.'






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






23. 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.






24. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'






25. One of the most popular tunneling protocols is






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

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27. '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.'






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






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






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






31. Main disadvantage of asymmetric algorithms is that they are slow.






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.'






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






34. '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.'






35. 'MACs with hash algorithms -'






36. 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.






37. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.






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






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






40. Uses IKE for key exchange.






41. A variable block- length and key-length cipher.






42. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.






43. Key exchange for IPSEC






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






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






46. 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.






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






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






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






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