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. Uses the D-H algorithm to come to agreement over a public network.






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






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






4. Does not provide payload encryption.






5. 'MACs with hash algorithms -'






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






7. Uses protocol number 50.






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






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






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






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






12. 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.






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






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






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






16. '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






17. 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


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






19. Used in government installs and was created to work with the SHA-1 hash algorithm.






20. A






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






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






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






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






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






26. Common key size is 1024 bits.






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






28. It uses UDP 500 and is defined by RFC 2409.






29. 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.






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






31. Has a trailer which identifies IPsec information and ESP integrity-check information.






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






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






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

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


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






37. One of the most popular tunneling protocols is






38. More CPU intensive






39. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'






40. 'Encryption - where Peer X uses Peer Y






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






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






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






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






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






46. IPSEC Encryption is performed by

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


47. DoS attacks are more probable with this mode.






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






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






50. 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.