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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. You check it by hashing data and appending the hash value to the data as you send it across the network to a peer.
ESP
IKE
MD5
Hashing
2. Origin authentication validates the origin of a message upon receipt; this process is done during initial communications.
IPSEC BENEFIT
'IPSEC (phase1 -step3)'
Hashing
MD5
3. 'can be achieved using one of three methods: preshared keys - encrypted nonces - or digital signatures.'
Origin Auth (DH auth)
Asymetric Encryption Protocols
IPSEC (aggressive mode)
ISAKMP
4. Has a trailer which identifies IPsec information and ESP integrity-check information.
DSA
ESP
SHA
3DES
5. IPsec implements using a shim header between L2 and L3
RSA
AH/ESP
ESP
IPSEC (aggressive mode)
6. 'algorithm encrypts and decrypts data three times with 3 different keys - effectively creating a 168-bit key.'
RSA/DSA
DSA
IPSEC BENEFIT
3DES
7. Used in government installs and was created to work with the SHA-1 hash algorithm.
IPSEC (main mode)
IPSEC (main mode)
MD5
DSA
8. Common key size is 1024 bits.
IPSEC (aggressive mode)
DSA
RSA
AH
9. Takes variable-length clear-text data to produce fixed-length hashed data that is unreadable.
MD5
IPSEC (aggressive mode)
3DES
HMAC
10. A
'MD5 - SHA-1 - or RSA'
Asymetric Encryption Protocols
SHA
Hashing
11. '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.'
GRE
Difffie-Hellman
AH
MD5
12. 'produces a 160-bit hash output - which makes it more difficult to decipher.'
3DES
SHA
ISAKMP
MD5
13. 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.
IKE
AH/ESP
DES
ISAKMP
14. 'Finally - the receiving devices decrypt the data with the first key.'
RSA
3DES
Hashing
IPSEC (aggressive mode)
15. Negotiation of the ISAKMP policy by offering and acceptance of protection suites
IPSEC (main mode)
DSA
DSA
IPSEC (aggressive mode)
16. 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.
ESP
IKE
AH/ESP
'IPSEC (phase1 -step3)'
17. 'provides everything required to securely connect over a public media - such as the Internet.'
AES
IPSEC (aggressive mode)
IPSEC
IPSEC BENEFIT
18. 'defines the mode of communication - creation - and management of security associations.'
ISAKMP
IPSEC (aggressive mode)
IPSEC (aggressive mode)
IPSEC (phase2)
19. 'has a Next Protocol field which identifies the next Layer 4 transport protocol in use - TCP or UDP'
AH/ESP
Hashing
Antireplay
RSA/DSA
20. Act of encapsulating a packet within another packet.
'IPSEC (phase1 -step1)'
ESP
Tunneling
HMAC-MD5/HMAC-SHA
21. Message of arbitrary length is taken as input and produces as output a 128-bit fingerprint or message digest of the input.
RSA
MD5
Difffie-Hellman
AH
22. Negotiation of a shared secret key for encryption of the IKE session using the D-H algorithm
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23. Data integrity is the process of making sure data is not tampered with while it
'MD5 - SHA-1 - or RSA'
DES
IKE
IPSEC BENEFIT
24. 'requires that the sender and receiver have key pairs. By combining the sender
AH
IKE
IPSEC (aggressive mode)
Difffie-Hellman
25. Uses protocol number 51.
DSA
HMAC
MD5
AH
26. IPSec SAs are negotiated and protected by the existing IPsec SA.
IPSEC (phase2)
IPSEC (main mode)
SHA
Difffie-Hellman
27. Provides authentication and encryption of the payload.
3DES
Origin Auth (DH auth)
ESP
Hashing
28. It also provides protection for ISAKMP peer identities with encryption.
3DES
Tunnel Mode (ipsec)
IPSEC (main mode)
RSA
29. The receiving device then encrypts the data with the second key.
GRE
SHA
MD5
3DES
30. 'Developed in 1977 by Ronald Rivest - Adi Shamir - and Leonard Adleman (therefore - RSA).'
3DES
DES
RSA
Difffie-Hellman
31. RFC 2631 on the workings of the key generation/exchange process.
IPSEC (main mode)
Difffie-Hellman
IKE
MD5
32. Uses IKE for key exchange.
RSA
ISAKMP
SHA
Difffie-Hellman
33. Does not provide payload encryption.
RSA
AH
'DES - 3DES - or AES.'
IPSEC
34. Provide authentication in Internet Key Exchange (IKE) Phase 2.
HMAC
Origin Auth (DH auth)
DSA
SHA
35. Used in IPsec for two discreet purposes:
Origin Auth (DH auth)
RSA
Difffie-Hellman
Asymetric Encryption Protocols
36. 'Encryption - where Peer X uses Peer Y
RSA
ISAKMP
3DES
ESP
37. Drawback of this is that the hash is passed unencrypted and is susceptible to PSK crack attacks.
Antireplay
IPSEC (aggressive mode)
IKE
IPSEC BENEFIT
38. 'group 1 identifies a 768-bit key - group 1 is faster to execute - but it is less secure -'
3DES
'IPSEC (phase1 -step2)'
3DES
Difffie-Hellman
39. 'group 5 identifies a 1536-bit key - provides for highest security but is the slowest of all groups.'
Difffie-Hellman
IPSEC (aggressive mode)
IPSEC (main mode)
RSA
40. 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.
ESP
GRE
Tunnel Mode (ipsec)
3DES
41. Hybrid protocol that defines the mechanism to derive authenticated keying material and negotiation of security associations (SA).
IKE
Tunnel Mode (ipsec)
RSA
Difffie-Hellman
42. Uses the D-H algorithm to come to agreement over a public network.
ISAKMP
Asymetric Encryption Protocols
IKE
IPSEC BENEFIT
43. Invented by Ron Rivest of RSA Security (RFC 1321).
MD5
IPSEC (aggressive mode)
RSA
IPSEC (aggressive mode)
44. '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.'
IKE
HMAC-MD5/HMAC-SHA
AES
3DES
45. 'MACs with hash algorithms -'
Antireplay
AH/ESP
hash-based message authentication codes (HMAC).
RSA
46. Main disadvantage of asymmetric algorithms is that they are slow.
AH
IPSEC
RSA/DSA
3DES
47. 'When using the hash-based key function -'
DSA
Transport Mode (Ipsec)
HMAC-MD5/HMAC-SHA
IPSEC (main mode)
48. DoS attacks are more probable with this mode.
Transport Mode (Ipsec)
Difffie-Hellman
IPSEC (aggressive mode)
AES
49. Used for integrity checks on peer and data sent by peer and for authentication checks.
Hashing
AH
3DES
DSA
50. '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.'
SHA
SHA
DES
'DES - 3DES - or AES.'