Test your basic knowledge |

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






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






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






4. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'






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






6. 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.






7. The DES algorithm that performs 3 times sequentially.






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






9. IPSEC Encryption is performed by

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






11. Uses protocol number 51.






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






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






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






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






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






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






18. Verify whether the data has been altered.






19. '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.'






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






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






22. '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.'






23. Does not provide payload encryption.






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






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






26. Common key size is 1024 bits.






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






28. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






31. 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.






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






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






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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






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






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






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






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






41. 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.






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






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






44. One of the most popular tunneling protocols is






45. Integrity checks are done

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183


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






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






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






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






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