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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. 'A 56-bit encryption algorithm - meaning the number of possible keys
Difffie-Hellman
AH/ESP
ISAKMP
DES
2. '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.'
Origin Auth (DH auth)
SHA
MD5
3DES
3. 'requires that the sender and receiver have key pairs. By combining the sender
Difffie-Hellman
'DES - 3DES - or AES.'
MD5
Asymetric Encryption Protocols
4. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
Difffie-Hellman
Origin Auth (DH auth)
Difffie-Hellman
3DES
5. Does not provide payload encryption.
SHA
IKE
AH
3DES
6. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
IPSEC (aggressive mode)
'IPSEC (phase1 -step2)'
RSA
'DES - 3DES - or AES.'
7. 'is a more secure version of MD5 - and hash-based message authentication codes (HMAC) provides further security with the inclusion of a key-based hash.'
HMAC
Hashing
AH
SHA
8. Uses protocol number 50.
ESP
RSA/DSA
'IPSEC (phase1 -step2)'
ISAKMP
9. Common key size is 1024 bits.
IPSEC (main mode)
Hashing
3DES
RSA
10. The receiving device decrypts the data with the third key.
RSA
Hashing
3DES
DES
11. RFC 2631 on the workings of the key generation/exchange process.
ISAKMP
IKE
Difffie-Hellman
'IPSEC (phase1 -step1)'
12. IPSec SAs are negotiated and protected by the existing IPsec SA.
IPSEC (aggressive mode)
Asymetric Encryption Protocols
IPSEC (phase2)
GRE
13. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
3DES
SHA
IPSEC (main mode)
hash-based message authentication codes (HMAC).
14. The DES algorithm that performs 3 times sequentially.
3DES
MD5
MD5
IPSEC (main mode)
15. Uses protocol number 51.
Asymetric Encryption Protocols
AH
Tunneling
SHA
16. One of the most popular tunneling protocols is
Hashing
GRE
'IPSEC (phase1 -step2)'
Asymetric Encryption Protocols
17. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
ESP
RSA
IPSEC (aggressive mode)
IKE
18. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
Difffie-Hellman
DES
AES
Hashing
19. 'MACs with hash algorithms -'
hash-based message authentication codes (HMAC).
Difffie-Hellman
AH/ESP
RSA
20. Integrity checks are done
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21. Used in government installs and was created to work with the SHA-1 hash algorithm.
ESP
IPSEC (main mode)
IKE
DSA
22. The sending device encrypts for a final time with another 56-bit key.
message authentication codes (MAC).
DSA
DES
3DES
23. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
IPSEC (aggressive mode)
Antireplay
3DES
AH
24. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
SHA
Asymetric Encryption Protocols
Asymetric Encryption Protocols
IPSEC (main mode)
25. ' is defined in RFC 3174. has as output a 160-bit value -'
RSA
'IPSEC (phase1 -step2)'
Asymetric Encryption Protocols
SHA
26. This mode does not support identity protection or protection against clogging attacks and spoofing.
Asymetric Encryption Protocols
SHA
IPSEC (aggressive mode)
Difffie-Hellman
27. 'Finally - the receiving devices decrypt the data with the first key.'
ISAKMP
DSA
SHA
3DES
28. No additional Layer 3 header is created. The original Layer 3 header is used.
3DES
Difffie-Hellman
3DES
Transport Mode (Ipsec)
29. Used in IPsec for two discreet purposes:
3DES
IKE
AES
RSA
30. IPSEC tunnels data through IP using one of two protocols?
AH/ESP
Difffie-Hellman
'DES - 3DES - or AES.'
MD5
31. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
IPSEC (aggressive mode)
ESP
IPSEC (main mode)
MD5
32. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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33. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
3DES
MD5
DES
DES
34. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
ESP
IKE
IPSEC BENEFIT
Hashing
35. 'defines the mode of communication - creation - and management of security associations.'
hash algorithms
hash-based message authentication codes (HMAC).
ISAKMP
'IPSEC (phase1 -step1)'
36. '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.'
ISAKMP
Difffie-Hellman
IKE
DSA
37. '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.'
Difffie-Hellman
AES
3DES
Asymetric Encryption Protocols
38. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
Hashing
AH/ESP
ISAKMP
IPSEC BENEFIT
39. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
Transport Mode (Ipsec)
IPSEC
AES
AH/ESP
40. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
AES
3DES
IPSEC (aggressive mode)
'IPSEC (phase1 -step2)'
41. IPsec implements using a shim header between L2 and L3
Difffie-Hellman
hash algorithms
hash-based message authentication codes (HMAC).
AH/ESP
42. Key exchange for IPSEC
'IPSEC (phase1 -step2)'
IPSEC (main mode)
SHA
IKE
43. '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
RSA
IPSEC (main mode)
3DES
RSA/DSA
44. IPSEC Encryption is performed by
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45. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
'IPSEC (phase1 -step1)'
SHA
Antireplay
IPSEC (main mode)
46. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
Difffie-Hellman
IPSEC BENEFIT
3DES
DSA
47. The protocol of choice for key management and establishing security associations between peers on the Internet.
DSA
DSA
ISAKMP
IPSEC (aggressive mode)
48. Uses the D-H algorithm to come to agreement over a public network.
MD5
ESP
DSA
IKE
49. Uses IKE for key exchange.
ISAKMP
3DES
IPSEC (main mode)
'MD5 - SHA-1 - or RSA'
50. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC
'IPSEC (phase1 -step3)'
3DES
IPSEC (phase2)