Network Performance Optimization

Correct Answer: To assign IP addresses to devices on a network

DHCP, or Dynamic Host Configuration Protocol, is a network protocol used to assign IP addresses and other network configuration parameters to devices on a network. The primary purpose of a DHCP server is to automatically assign IP addresses to devices, so answer 'To assign IP addresses to devices on a network' is the correct one. Now, 'To provide secure remote access' is incorrect because that is a function of a Virtual Private Network (VPN). 'To manage email traffic' is also wrong because this responsibility lies with an email server. Lastly, 'To filter network traffic' is the function of a firewall, not a DHCP server. Therefore, the only accurate description of a DHCP server's purpose is to assign IP addresses to devices on a network.

Correct Answer: SFTP

SFTP, or Secure File Transfer Protocol, is the correct answer because it is designed for secure file transfer. It is a network protocol that provides encrypted file transfer and manipulation facilities over the Secure Shell (SSH) protocol. Whereas the other protocols listed, FTP, TFTP, and SCP, do not provide the same level of security. FTP (File Transfer Protocol) and TFTP (Trivial File Transfer Protocol) transmit data without encryption, which makes them insecure as the data can easily be intercepted. SCP, or Secure Copy Protocol, is a means of securely transferring computer files between a local host and a remote host or between two remote hosts but it lacks the features of SFTP such as viewing remote directory listings and removing remote files.

Correct Answer: Keyboard type

The type of keyboard doesn't affect network performance as it's an input device that has no relation to the performance of a network. On the other hand, other options have a direct impact on network performance. Bandwidth refers to the data transfer rate which affects the speed of the network. Latency refers to the delay in data transfer which can slow down the network performance. Jitter, which is the variation in latency in packet flows, can disrupt the smoothness of data traffic.