Podcast
Questions and Answers
What tool is required to diagnose which network adapter is causing a broadcast storm on the LAN?
What tool is required to diagnose which network adapter is causing a broadcast storm on the LAN?
- Firewall
- Intrusion detection system
- Protocol analyzer (correct)
- Port scanner
Which of the following is Anthony’s private key pair in the scenario described?
Which of the following is Anthony’s private key pair in the scenario described?
- (7,20)
- (6,33)
- (7,33) (correct)
- (6,20)
What type of authentication model allows users to enter their credentials once to access multiple server resources?
What type of authentication model allows users to enter their credentials once to access multiple server resources?
- Virtual private network
- Single sign-on (correct)
- Federated identity management
- Three-factor authentication
What is the term for installing agents on client computers to monitor them from a server program?
What is the term for installing agents on client computers to monitor them from a server program?
Which of the following is a stream cipher used for encryption?
Which of the following is a stream cipher used for encryption?
What is used to secure Layer 2 Tunneling Protocol (L2TP) sessions?
What is used to secure Layer 2 Tunneling Protocol (L2TP) sessions?
Which of the following access control models is the weakest?
Which of the following access control models is the weakest?
Which encryption type has the shortest key length?
Which encryption type has the shortest key length?
Which of the following cryptographic techniques uses the bitwise XOR operation to combine the keystream with the plaintext?
Which of the following cryptographic techniques uses the bitwise XOR operation to combine the keystream with the plaintext?
Which of the following is a type of multifactor authentication?
Which of the following is a type of multifactor authentication?
Which access control model is typically used in firewalls?
Which access control model is typically used in firewalls?
Which of the following is considered a 'something you are' factor in authentication?
Which of the following is considered a 'something you are' factor in authentication?
Which encryption algorithm would provide the best balance between security and performance for encrypting credit card data?
Which encryption algorithm would provide the best balance between security and performance for encrypting credit card data?
What remote authentication protocol was developed by Cisco?
What remote authentication protocol was developed by Cisco?
After identifying risks during an audit, what should be the next step?
After identifying risks during an audit, what should be the next step?
What security feature keeps users in a standard user mode, even if they are part of the administrators group?
What security feature keeps users in a standard user mode, even if they are part of the administrators group?
Which statement about digital certificates is true?
Which statement about digital certificates is true?
Which encryption algorithm is a common standard that can work with a 256-bit key size?
Which encryption algorithm is a common standard that can work with a 256-bit key size?
What is the primary function of a block cipher?
What is the primary function of a block cipher?
In which scenario would a symmetric key algorithm be used instead of a PKI?
In which scenario would a symmetric key algorithm be used instead of a PKI?
Which network protocol is designed for secure file transfer between computers?
Which network protocol is designed for secure file transfer between computers?
What is the primary purpose of hashing algorithms like MD5?
What is the primary purpose of hashing algorithms like MD5?
Which authentication protocol is considered more secure than PAP because it encrypts usernames and passwords?
Which authentication protocol is considered more secure than PAP because it encrypts usernames and passwords?
What is the primary advantage of using a hybrid cipher over a block cipher or stream cipher alone?
What is the primary advantage of using a hybrid cipher over a block cipher or stream cipher alone?
Which security control is implemented to prevent the use of stolen certificates?
Which security control is implemented to prevent the use of stolen certificates?
Which type of security control do computer security audits fall under?
Which type of security control do computer security audits fall under?
What is the value of the shared secret key that Alice and Bob will use for further encryption, given the following Diffie-Hellman key agreement parameters?
What is the value of the shared secret key that Alice and Bob will use for further encryption, given the following Diffie-Hellman key agreement parameters?
What is the purpose of authentication in an organization's IT systems?
What is the purpose of authentication in an organization's IT systems?
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Study Notes
Network Troubleshooting
- A protocol analyzer is required to diagnose which network adapter is causing a broadcast storm on the LAN.
Cryptography
Key Pairs
- Anthony's private key pair for SSL consists of two prime numbers, p = 3 and q = 11, and e = 3.
Authentication
- Single sign-on (SSO) is an authentication model where users can enter their credentials one time and access multiple server resources.
- Federated identity management is not the same as SSO.
Network Management
- NMS (Network Management System) involves installing agents on client computers and monitoring them from a central server.
Security Controls
- Administrative security controls deal with policies, procedures, security awareness training, and disaster recovery plans.
Cryptography
- RC4 is a stream cipher.
- L2TP sessions are secured using IPsec.
Block Ciphers
- A block cipher encrypts 128 bits of data at a time before sending it across the network.
PKI Certificates
- E-commerce, web logins, and VPNs use PKI.
- E-mail and other communications may not use PKI.
Network Protocols
- SSH is used for secure data transfer between computers.
Data Integrity
- Compare the final MD5 hash with the original to verify that a download from the Internet has not been modified.
Authentication
- PAP is insecure because usernames and passwords are sent as clear text.
- RADIUS provides authentication, authorization, and accounting services.
Encryption
- DES is a weak encryption type.
- One-time pad combines the keystream with the plaintext message using the bitwise XOR operator to produce the ciphertext.
Access Control
- Multifactor authentication uses two or more types of authentication.
- Role-based access control is used in firewalls.
Authentication Factors
- Something the user is (e.g., thumbprint) is a type of authentication factor.
Digital Certificates
- An X.509 certificate contains the issuer's name, certificate version, and public key information, but not the owner's symmetric key.
- A CRL is digitally signed by the CA to ensure authenticity.
Group Management
- Tom can add users to a group more efficiently using various tools.
Encryption Algorithms
- AES is a secure algorithm with low CPU utilization.
Remote Authentication
- TACACS+ was developed by Cisco.
Auditing
- After risk has been scanned for, analyzed, and calculated, a plan should be developed to mitigate risk.
User Account Control
- User account control keeps users in a standard user mode, even if they are administrators.
Cryptography
- Certificates are digitally signed electronic documents that bind a private key with a user identity.
- AES is a common encryption standard used today that can work with a 256-bit block size.
- In cryptography, the key is essential to determine the output of a cipher.
PKI
- Most PKIs do not use a web of trust model.
Auditing
- Computer security audits fall under detective security controls.
Key Agreement
- Diffie-Hellman key agreement method can be used to agree on a shared secret key between Alice and Bob.
- The shared secret key is 5 in the given scenario.
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