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NEW QUESTION: 1
What is NOT an authentication method within IKE and IPsec?
A. certificate based authentication
B. Public key authentication
C. CHAP
D. Pre shared key
Answer: C
Explanation:
CHAP is not used within IPSEC or IKE. CHAP is an authentication scheme used by
Point to Point Protocol (PPP) servers to validate the identity of remote clients. CHAP periodically
verifies the identity of the client by using a three-way handshake. This happens at the time of
establishing the initial link (LCP), and may happen again at any time afterwards. The verification is
based on a shared secret (such as the client user's password).
After the completion of the link establishment phase, the authenticator sends a "challenge"
message to the peer.
The peer responds with a value calculated using a one-way hash function on the challenge and
the secret combined.
The authenticator checks the response against its own calculation of the expected hash value. If
the values match, the authenticator acknowledges the authentication; otherwise it should
terminate the connection.
At random intervals the authenticator sends a new challenge to the peer and repeats steps 1
through 3.
The following were incorrect answers:
Pre Shared Keys
In cryptography, a pre-shared key or PSK is a shared secret which was previously shared
between the two parties using some secure channel before it needs to be used. To build a key
from shared secret, the key derivation function should be used. Such systems almost always use
symmetric key cryptographic algorithms. The term PSK is used in WiFi encryption such as WEP or
WPA, where both the wireless access points (AP) and all clients share the same key.
The characteristics of this secret or key are determined by the system which uses it; some system
designs require that such keys be in a particular format. It can be a password like 'bret13i', a
passphrase like 'Idaho hung gear id gene', or a hexadecimal string like '65E4 E556 8622 EEE1'.
The secret is used by all systems involved in the cryptographic processes used to secure the
traffic between the systems.
Certificat Based Authentication
The most common form of trusted authentication between parties in the wide world of Web commerce is the exchange of certificates. A certificate is a digital document that at a minimum includes a Distinguished Name (DN) and an associated public key.
The certificate is digitally signed by a trusted third party known as the Certificate Authority (CA). The CA vouches for the authenticity of the certificate holder. Each principal in the transaction presents certificate as its credentials. The recipient then validates the certificate's signature against its cache of known and trusted CA certificates. A "personal certificate" identifies an end user in a transaction; a "server certificate" identifies the service provider.
Generally, certificate formats follow the X.509 Version 3 standard. X.509 is part of the Open Systems Interconnect (OSI) X.500 specification.
Public Key Authentication Public key authentication is an alternative means of identifying yourself to a login server, instead of typing a password. It is more secure and more flexible, but more difficult to set up.
In conventional password authentication, you prove you are who you claim to be by proving that you know the correct password. The only way to prove you know the password is to tell the server what you think the password is. This means that if the server has been hacked, or spoofed an attacker can learn your password.
Public key authentication solves this problem. You generate a key pair, consisting of a public key (which everybody is allowed to know) and a private key (which you keep secret and do not give to anybody). The private key is able to generate signatures. A signature created using your private key cannot be forged by anybody who does not have a copy of that private key; but anybody who has your public key can verify that a particular signature is genuine.
So you generate a key pair on your own computer, and you copy the public key to the server. Then, when the server asks you to prove who you are, you can generate a signature using your private key. The server can verify that signature (since it has your public key) and allow you to log in. Now if the server is hacked or spoofed, the attacker does not gain your private key or password; they only gain one signature. And signatures cannot be re-used, so they have gained nothing.
There is a problem with this: if your private key is stored unprotected on your own computer, then anybody who gains access to your computer will be able to generate signatures as if they were you. So they will be able to log in to your server under your account. For this reason, your private key is usually encrypted when it is stored on your local machine, using a passphrase of your choice. In order to generate a signature, you must decrypt the key, so you have to type your passphrase. References:
RFC 2409: The Internet Key Exchange (IKE); DORASWAMY, Naganand & HARKINS, Dan Ipsec: The New Security Standard for the Internet, Intranets, and Virtual Private Networks, 1999, Prentice Hall PTR; SMITH, Richard E. Internet Cryptography, 1997, Addison-Wesley Pub Co.; HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 2001, McGraw-Hill/Osborne, page 467. http://en.wikipedia.org/wiki/Pre-shared_key http://www.home.umk.pl/~mgw/LDAP/RS.C4.JUN.97.pdf http://the.earth.li/~sgtatham/putty/0.55/htmldoc/Chapter8.html#S8.1
NEW QUESTION: 2
Which of the following objects can you use when you build an analytic view?
Note: There are 3 correct answers to this question.
A. Projections
B. Attribute Views
C. Hierarchies
D. Analytic Views
E. Variables
Answer: B,C,E
NEW QUESTION: 3
You are configuring a switch as a LISP xTR. You plan to use the LISP xTR when deploying redundant map servers. Which action do you take?
A. Configure the map notify group command by using the anycast IP address of the map resolver
B. Configure the map-notify group command by using the IP address of each map server
C. Register the LISP xTR to the IP address of each map server
D. Register the LISP xTR to the anycast IP address of the map resolver.
Answer: A