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Test your basic knowledge |
CCIE Sec Encryption Ipsec
Start Test
Study First
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. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
3DES
Difffie-Hellman
IPSEC BENEFIT
IPSEC (aggressive mode)
2. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
'MD5 - SHA-1 - or RSA'
3DES
Origin Auth (DH auth)
Transport Mode (Ipsec)
3. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
MD5
Hashing
Difffie-Hellman
Hashing
4. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
DSA
IPSEC (aggressive mode)
hash algorithms
3DES
5. Data integrity is the process of making sure data is not tampered with while it
IPSEC BENEFIT
AES
IPSEC (aggressive mode)
Hashing
6. Can be implemented efficiently on a wide range of processors and in hardware.
DSA
Tunnel Mode (ipsec)
AES
IPSEC (aggressive mode)
7. DoS attacks are more probable with this mode.
IPSEC
Tunneling
hash-based message authentication codes (HMAC).
IPSEC (aggressive mode)
8. It also provides protection for ISAKMP peer identities with encryption.
'IPSEC (phase1 -step3)'
IPSEC (main mode)
AH/ESP
SHA
9. '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.'
IPSEC BENEFIT
Difffie-Hellman
AH/ESP
SHA
10. The sending device encrypts for a final time with another 56-bit key.
DSA
AH
3DES
ISAKMP
11. The receiving device decrypts the data with the third key.
3DES
HMAC
Difffie-Hellman
ESP
12. '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.'
Hashing
RSA
IPSEC (main mode)
IPSEC (main mode)
13. Uses protocol number 50.
AH
3DES
ESP
SHA
14. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
AES
hash algorithms
Difffie-Hellman
3DES
15. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
hash algorithms
IPSEC (main mode)
DSA
16. A variable block- length and key-length cipher.
ESP
AES
IPSEC (main mode)
IPSEC (aggressive mode)
17. 'requires that the sender and receiver have key pairs. By combining the sender
IPSEC (aggressive mode)
AES
IKE
Difffie-Hellman
18. Invented by Ron Rivest of RSA Security (RFC 1321).
IKE
MD5
Hashing
3DES
19. The DES algorithm that performs 3 times sequentially.
AH
3DES
GRE
RSA
20. Used in government installs and was created to work with the SHA-1 hash algorithm.
RSA
DSA
message authentication codes (MAC).
GRE
21. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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22. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IPSEC (main mode)
'DES - 3DES - or AES.'
3DES
IKE
23. 'MACs with hash algorithms -'
MD5
SHA
hash-based message authentication codes (HMAC).
IPSEC (aggressive mode)
24. Used for integrity checks on peer and data sent by peer and for authentication checks.
IKE
Transport Mode (Ipsec)
IPSEC BENEFIT
AH
25. The protocol of choice for key management and establishing security associations between peers on the Internet.
Transport Mode (Ipsec)
IPSEC BENEFIT
Origin Auth (DH auth)
ISAKMP
26. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
ISAKMP
3DES
MD5
Hashing
27. 'When using the hash-based key function -'
ISAKMP
RSA
HMAC-MD5/HMAC-SHA
RSA
28. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
AH/ESP
DSA
3DES
IPSEC (aggressive mode)
29. The receiving device then encrypts the data with the second key.
IPSEC (phase2)
Origin Auth (DH auth)
3DES
SHA
30. Uses the D-H algorithm to come to agreement over a public network.
AES
IPSEC BENEFIT
Difffie-Hellman
IKE
31. No additional Layer 3 header is created. The original Layer 3 header is used.
Difffie-Hellman
Transport Mode (Ipsec)
Difffie-Hellman
Difffie-Hellman
32. 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.
IKE
3DES
Asymetric Encryption Protocols
IPSEC (main mode)
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.
3DES
DES
3DES
hash algorithms
34. 'Encryption - where Peer X uses Peer Y
RSA
3DES
'DES - 3DES - or AES.'
HMAC-MD5/HMAC-SHA
35. '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
IKE
RSA
AH/ESP
IPSEC (aggressive mode)
36. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
MD5
IPSEC (main mode)
3DES
Asymetric Encryption Protocols
37. That authenticate data packets and ensure that data is not tampered with or modified.
ESP
hash algorithms
HMAC
Difffie-Hellman
38. IPSEC tunnels data through IP using one of two protocols?
3DES
ESP
AH/ESP
ISAKMP
39. '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
Difffie-Hellman
IPSEC BENEFIT
Asymetric Encryption Protocols
AES
40. It uses UDP 500 and is defined by RFC 2409.
IKE
RSA/DSA
SHA
RSA
41. 'defines the mode of communication - creation - and management of security associations.'
IPSEC (aggressive mode)
3DES
3DES
ISAKMP
42. '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.'
AH
RSA
DES
ISAKMP
43. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC
'IPSEC (phase1 -step3)'
3DES
Difffie-Hellman
44. Does not provide payload encryption.
AH
IPSEC
IPSEC BENEFIT
RSA
45. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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46. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
3DES
IPSEC (main mode)
IPSEC (main mode)
SHA
47. RFC 2631 on the workings of the key generation/exchange process.
Difffie-Hellman
'IPSEC (phase1 -step1)'
'DES - 3DES - or AES.'
RSA
48. 'in most cases - this mode is preferred with certificates.'
'IPSEC (phase1 -step1)'
IPSEC (main mode)
IPSEC (aggressive mode)
Difffie-Hellman
49. IPsec implements using a shim header between L2 and L3
AH/ESP
IPSEC (aggressive mode)
IKE
3DES
50. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
IKE
RSA
AH/ESP
IPSEC (main mode)