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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. IPSec SAs are negotiated and protected by the existing IPsec SA.
MD5
IPSEC (aggressive mode)
IPSEC (phase2)
3DES
2. A
Antireplay
IPSEC (main mode)
Hashing
ESP
3. Used for integrity checks on peer and data sent by peer and for authentication checks.
3DES
AH
RSA
IKE
4. 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.
DSA
hash-based message authentication codes (HMAC).
IKE
SHA
5. 'requires that the sender and receiver have key pairs. By combining the sender
IPSEC (aggressive mode)
Difffie-Hellman
DSA
IKE
6. IPSEC tunnels data through IP using one of two protocols?
Asymetric Encryption Protocols
AH/ESP
3DES
'IPSEC (phase1 -step2)'
7. Uses protocol number 50.
Hashing
ESP
RSA
AH
8. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
3DES
Difffie-Hellman
IPSEC BENEFIT
IPSEC (aggressive mode)
9. The sending device encrypts for a final time with another 56-bit key.
AH/ESP
Difffie-Hellman
3DES
RSA/DSA
10. Can be implemented efficiently on a wide range of processors and in hardware.
AH
3DES
AES
Difffie-Hellman
11. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
AES
3DES
Origin Auth (DH auth)
IPSEC (phase2)
12. '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
3DES
DSA
IPSEC (main mode)
RSA
13. The DES algorithm that performs 3 times sequentially.
3DES
SHA
Difffie-Hellman
RSA
14. Uses the D-H algorithm to come to agreement over a public network.
Hashing
3DES
'IPSEC (phase1 -step3)'
IKE
15. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
SHA
Difffie-Hellman
DES
3DES
16. 'MACs with hash algorithms -'
hash-based message authentication codes (HMAC).
Difffie-Hellman
IPSEC (aggressive mode)
IKE
17. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
RSA
GRE
MD5
Difffie-Hellman
18. DoS attacks are more probable with this mode.
IPSEC (aggressive mode)
ISAKMP
SHA
HMAC
19. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
Asymetric Encryption Protocols
HMAC-MD5/HMAC-SHA
Antireplay
IKE
20. RFC 2631 on the workings of the key generation/exchange process.
SHA
Origin Auth (DH auth)
RSA
Difffie-Hellman
21. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
IKE
RSA
3DES
3DES
22. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
3DES
AES
IPSEC BENEFIT
Difffie-Hellman
23. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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24. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
IKE
3DES
Difffie-Hellman
IPSEC (aggressive mode)
25. Has a trailer which identifies IPsec information and ESP integrity-check information.
IPSEC (phase2)
'MD5 - SHA-1 - or RSA'
Asymetric Encryption Protocols
ESP
26. 'Encryption - where Peer X uses Peer Y
IPSEC (main mode)
Hashing
Hashing
RSA
27. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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28. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
3DES
Difffie-Hellman
Hashing
29. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
Hashing
IPSEC (aggressive mode)
Hashing
AES
30. Provides authentication and encryption of the payload.
DES
RSA
ESP
DES
31. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
AH
3DES
SHA
IPSEC
32. Data integrity is the process of making sure data is not tampered with while it
RSA/DSA
IPSEC BENEFIT
AH/ESP
IPSEC (phase2)
33. The protocol of choice for key management and establishing security associations between peers on the Internet.
message authentication codes (MAC).
3DES
RSA
ISAKMP
34. The receiving device decrypts the data with the third key.
SHA
3DES
'IPSEC (phase1 -step3)'
Hashing
35. The receiving device then encrypts the data with the second key.
MD5
Difffie-Hellman
IKE
3DES
36. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
Tunneling
Hashing
IKE
IPSEC (main mode)
37. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
Difffie-Hellman
IKE
RSA
3DES
38. 'The messages are authenticated - and the mechanisms that provide such integrity checks based on a secret key are usually called'
ESP
Hashing
IPSEC BENEFIT
message authentication codes (MAC).
39. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
SHA
IPSEC (aggressive mode)
message authentication codes (MAC).
RSA
40. '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
IPSEC BENEFIT
SHA
HMAC
Asymetric Encryption Protocols
41. No additional Layer 3 header is created. The original Layer 3 header is used.
'IPSEC (phase1 -step1)'
Hashing
Transport Mode (Ipsec)
Hashing
42. 'The sending device decrypts the data with the second key - which is also 56 bits in length.'
IPSEC (main mode)
3DES
'DES - 3DES - or AES.'
DSA
43. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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44. 'defines the mode of communication - creation - and management of security associations.'
RSA
IPSEC (main mode)
ISAKMP
'IPSEC (phase1 -step3)'
45. Invented by Ron Rivest of RSA Security (RFC 1321).
IPSEC (aggressive mode)
RSA
MD5
HMAC
46. 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.
IPSEC (phase2)
IPSEC (aggressive mode)
Tunnel Mode (ipsec)
DES
47. Provide authentication in Internet Key Exchange (IKE) Phase 2.
Tunneling
HMAC
3DES
ESP
48. Uses protocol number 51.
AES
AH
IKE
GRE
49. ' is defined in RFC 3174. has as output a 160-bit value -'
IKE
SHA
ISAKMP
IKE
50. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
DSA
AES
Difffie-Hellman
AH/ESP