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






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






3. '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.'






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






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






6. Integrity checks are done

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


7. 'Encryption - where Peer X uses Peer Y






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






9. 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.






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






12. 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


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






14. Used in IPsec for two discreet purposes:






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






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






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






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






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






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






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






22. 'MACs with hash algorithms -'






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






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






25. Key exchange for IPSEC






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






27. A






28. '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.'






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






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






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






33. IPSEC Encryption is performed by

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


34. Common key size is 1024 bits.






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






36. Act of encapsulating a packet within another packet.






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






38. Provides authentication and encryption of the payload.






39. 'in most cases - this mode is preferred with certificates.'






40. '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.'






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






42. '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






43. '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.'






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






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






46. Uses protocol number 50.






47. Uses protocol number 51.






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






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






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