Sophos Technologies Interview Questions, Process, and Tips

Phase 1 is for establishing a secure channel and Phase 2 is for negotiating IPSec SAs.

• IKEv1 is a protocol used for VPN tunneling

• Phase 1 negotiates the parameters for the secure channel

• Phase 2 negotiates the IPSec SAs for data transmission

• Phase 1 uses Diffie-Hellman for key exchange

• Phase 2 uses either AH or ESP for data encryption and authentication

NAT-T is a protocol used to encapsulate and encrypt IPsec traffic when NAT is used in the network.

• NAT-T stands for Network Address Translation - Traversal

• It allows IPsec traffic to pass through NAT devices

• It encapsulates and encrypts IPsec traffic in UDP packets

• It uses port 4500 by default

• Example: A remote worker using a VPN to connect to their company's network from a hotel room with a NAT router

TCP flags are control bits used in TCP to indicate the status of a connection.

• TCP flags are 6 bits in the TCP header.

• They are used to indicate the status of a connection, such as whether it is being opened, closed, or reset.

• Some common TCP flags include SYN, ACK, FIN, RST, and URG.

• SYN is used to initiate a connection, ACK is used to acknowledge receipt of data, FIN is used to terminate a connection, RST is used to rese...read more

SSL Inspection is a process of intercepting and decrypting SSL/TLS traffic to inspect it for security purposes.

• SSL Inspection intercepts SSL/TLS traffic and decrypts it

• It allows inspection of encrypted traffic for security threats

• It requires a trusted root certificate to be installed on the device

• It can cause issues with end-to-end encryption and privacy concerns

SSL handshake is a process of establishing a secure connection between a client and a server.

• Client sends a request to the server to initiate the SSL handshake

• Server responds with its SSL certificate

• Client verifies the certificate and generates a symmetric key

• Client sends a message encrypted with the symmetric key to the server

• Server decrypts the message and sends a confirmation to the client

• The SSL handshake is comple

Abstract class is a class that cannot be instantiated and can have both abstract and non-abstract methods. Interface is a collection of abstract methods.

• Abstract class can have constructors while interface cannot

• A class can implement multiple interfaces but can only inherit from one abstract class

• Abstract class can have instance variables while interface cannot

• Abstract class is used when we want to provide a common bas...read more

Git commands are used to manage version control of code. There are various types of Git commands.

• Basic commands: add, commit, push, pull, clone

• Branching commands: branch, checkout, merge, rebase

• Advanced commands: stash, cherry-pick, reset, revert

• Query commands: log, diff, blame, show