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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
DES
SHA
IPSEC (main mode)
2. 'provides everything required to securely connect over a public media - such as the Internet.'
IPSEC (main mode)
HMAC
IPSEC
ESP
3. Uses protocol number 50.
ESP
Hashing
AES
IKE
4. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
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5. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
3DES
Difffie-Hellman
RSA
Tunnel Mode (ipsec)
6. '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
Asymetric Encryption Protocols
AES
RSA
IPSEC (aggressive mode)
7. RFC 2631 on the workings of the key generation/exchange process.
RSA
Difffie-Hellman
HMAC-MD5/HMAC-SHA
'MD5 - SHA-1 - or RSA'
8. IPSEC Encryption is performed by
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9. '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.'
Hashing
Origin Auth (DH auth)
3DES
MD5
10. IPSEC performs this function by using a sequence field in the IPsec header combined with integrity checks.
IPSEC (aggressive mode)
HMAC-MD5/HMAC-SHA
ESP
Antireplay
11. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
IPSEC (aggressive mode)
AH/ESP
ESP
Tunneling
12. Main mode establishes ISAKMP security association in six messages and performs authenticated D-H exchange.
AES
RSA
SHA
IPSEC (main mode)
13. Benefits are that the preshared authentication can be based on ID versus IP address and the speed of the process.
Antireplay
IPSEC (main mode)
RSA
IPSEC (aggressive mode)
14. 'group 2 identifies a 1024-bit key - group 2 is more secure - but slower to execute.'
IKE
IPSEC (aggressive mode)
Difffie-Hellman
AH/ESP
15. Provides authentication and encryption of the payload.
ESP
Asymetric Encryption Protocols
SHA
IKE
16. Provide authentication in Internet Key Exchange (IKE) Phase 2.
AH
HMAC
'DES - 3DES - or AES.'
IKE
17. Used for integrity checks on peer and data sent by peer and for authentication checks.
IPSEC (main mode)
DES
AH
message authentication codes (MAC).
18. 'It is not used for encryption or digital signatures; it is used to obtain a shared secret
IKE
Difffie-Hellman
Hashing
AES
19. DoS attacks are more probable with this mode.
AH
Difffie-Hellman
RSA
IPSEC (aggressive mode)
20. 'defines the mode of communication - creation - and management of security associations.'
MD5
ISAKMP
RSA
Difffie-Hellman
21. '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/ESP
Tunnel Mode (ipsec)
DES
hash-based message authentication codes (HMAC).
22. 'When using the hash-based key function -'
'IPSEC (phase1 -step2)'
Transport Mode (Ipsec)
HMAC-MD5/HMAC-SHA
Hashing
23. 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.
IPSEC (aggressive mode)
IKE
MD5
DSA
24. 'Created by NIST in 1994 - is the algorithm used for digital signatures but not for encryption.'
message authentication codes (MAC).
DSA
hash-based message authentication codes (HMAC).
IPSEC (aggressive mode)
25. One of the most popular tunneling protocols is
GRE
'MD5 - SHA-1 - or RSA'
'DES - 3DES - or AES.'
IPSEC (main mode)
26. ID exchange and authentication of D-H key by using the reply to the received nonce or string of bits
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27. '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.'
HMAC-MD5/HMAC-SHA
ISAKMP
DSA
SHA
28. Invented by Ron Rivest of RSA Security (RFC 1321).
3DES
Difffie-Hellman
MD5
IPSEC
29. ' is defined in RFC 3174. has as output a 160-bit value -'
SHA
AES
'IPSEC (phase1 -step2)'
3DES
30. Data integrity is the process of making sure data is not tampered with while it
Hashing
Hashing
IKE
IPSEC BENEFIT
31. Main disadvantage of asymmetric algorithms is that they are slow.
RSA/DSA
3DES
DSA
HMAC-MD5/HMAC-SHA
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.'
AH
Difffie-Hellman
hash-based message authentication codes (HMAC).
MD5
33. 'establishes ISAKMP SA in three messages -because it negotiates a ISAKMP policy and a DJ nonce exchange together.'
IPSEC (aggressive mode)
3DES
DSA
IPSEC (main mode)
34. '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.'
IPSEC (main mode)
HMAC
Hashing
Asymetric Encryption Protocols
35. 'MACs with hash algorithms -'
Difffie-Hellman
MD5
DES
hash-based message authentication codes (HMAC).
36. 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.
Asymetric Encryption Protocols
DES
AES
IKE
37. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
RSA/DSA
3DES
Transport Mode (Ipsec)
Hashing
38. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
hash-based message authentication codes (HMAC).
SHA
DES
3DES
39. This mode does not support identity protection or protection against clogging attacks and spoofing.
Asymetric Encryption Protocols
SHA
Difffie-Hellman
IPSEC (aggressive mode)
40. Uses IKE for key exchange.
DES
Asymetric Encryption Protocols
'MD5 - SHA-1 - or RSA'
ISAKMP
41. A variable block- length and key-length cipher.
AES
hash algorithms
ISAKMP
IKE
42. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
DSA
MD5
Hashing
SHA
43. Key exchange for IPSEC
'MD5 - SHA-1 - or RSA'
IKE
SHA
SHA
44. 'including Internet Security Association and Key Management Protocol (ISAKMP) - Secure Key Exchange Mechanism for the Internet (SKEME) - and Oakley.'
Asymetric Encryption Protocols
Difffie-Hellman
IKE
SHA
45. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
3DES
AH/ESP
IPSEC (main mode)
AH
46. 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.
DES
DSA
GRE
IPSEC (aggressive mode)
47. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
IPSEC (main mode)
3DES
SHA
48. IPSEC tunnels data through IP using one of two protocols?
AH
ESP
HMAC-MD5/HMAC-SHA
AH/ESP
49. 'key lengths are 128 - 192 - or 256 bits to encrypt blocks of equal length.'
AES
hash algorithms
AH
SHA
50. The sending device encrypts for a final time with another 56-bit key.
3DES
IPSEC (phase2)
RSA
MD5