Question

xyz university wants to set up a vpn network to connect to the internet and ensure that all their data is safe. they have asked you to recommend the correct communication protocol to use. which of the following protocols should you recommend and why?

ipsec, because it authenticates that the packets received were sent from the source and ensures that no other party can view the contents. it manages the keys to ensure that they are not intercepted or used by unauthorized parties.

https, because it authenticates that the packets received were sent from the source and ensures that no other party can view the contents. it manages the keys to ensure that they are not intercepted or used by unauthorized parties.

tls, because it is used to secure communications between a browser and a web server. this ensures data is safe in communications across the network.

ssh, because it is used to secure communications between a browser and a web server. this ensures data is safe in communications across the network.

question 20 2 pts

under which of the following modes does the ciphertext depend only on the plaintext and the key, independent of the previous ciphertext blocks?

gcm

crt

ecb

cbc

Explanation:

1. For the first question, IPsec is a common protocol for VPNs. It authenticates packet - sources and encrypts data to ensure security, managing keys to prevent unauthorized access. HTTPS is mainly for secure web - browsing, TLS is for securing browser - web server communications, and SSH is for secure remote access.
2. For the second question, in Electronic Codebook (ECB) mode, the ciphertext depends only on the plaintext and the key, independent of previous ciphertext blocks. GCM (Galois/Counter Mode) has additional authentication features, CRT (Chinese Remainder Theorem) is not a cipher mode, and CBC (Cipher Block Chaining) mode uses the previous ciphertext block in the encryption process.

Answer:

1. IPsec, because it authenticates that the packets received were sent from the source and ensures that no other party can view the contents. It manages the keys to ensure that they are not intercepted or used by unauthorized parties.
2. ECB