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Cards In This Set
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What are 3 vital functions of VPNs?
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Data origin authentication, Encryption, Data Integrity
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Name 3 protocols used to create tunnels.
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Generic Routing Encapsulation (GRE) (RFC1701), Layer 2 Tunneling Protocol (L2TP)(RFC2661), IP Security (IPSec)
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Name a major drawback of both GRE & L2TP.
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No encryption
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Name a major drawback of IPSec.
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IPSec only supports unicast IP traffic.
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Name 2 types of remote access VPNs.
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Client initiated (Remote access), Network Access Server initiated (site-to-site).
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What is the difference between client-initiated and NAS-initiated VPNs?
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Client-initiated uses a client application to create the tunnel, NAS-initiated is where the user dials into a NAS device that creates the tunnel.
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What is anti-replay protection?
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Protects against replay attacks, malicious repeat, or delay of valid transmission attacks by using one-time tokens and sequence numbers for proof of identity.
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Name 3 data encryption tecnologies and state which one is the best.
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Data Encryption Standard (DES), Triple DES, Advanced Encryption Standard. (AES). AES is the best.
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What is the key size of DES?
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56 bits
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What is symmetric encryption?
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An algorithm where the key that is used for encryption is also used for decryption.
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Which encryption technologies use symmetric encryption?
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DES & TDES
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What is asymmetric encryption?
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Uses both a public & private key for both sender & receiver.
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What is the name of a 3rd party that certifies public keys?
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Certificate Authority (CA)
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What is RSA?
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A well-known public key encryption scheme.
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Name an algorithm that allows the exchange of secret keys over a non-secure connection.
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Diffie-Hellman
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