202-450 Exam Dumps - LPIC-2 - Exam 202 (part 2 of 2), version 4.5

The command that creates a SSH key pair is ssh-keygen. This command generates a public and a private key file that can be used for SSH authentication. The command can take various options to specify the algorithm, the file name, the passphrase, and other parameters for the key pair. For more information, see the web search results below or the man page of ssh-keygen.

How to Use ssh-keygen to Generate a New SSH Key?

 The option within the ISC DHCPD configuration file that defines the IPv4 DNS server address(es) to be sent to the DHCP clients is domain-name-servers. This option takes one or more IPv4 addresses as arguments and specifies the DNS servers that the client should use for name resolution. The domain-name-servers option is part of the standard DHCP options defined in RFC 2132 and is supported by the ISC DHCP server. The domain-name-servers option can be specified globally, per subnet, per shared network, per group, or per host in the dhcpd.conf file. For example, the following line in the dhcpd.conf file will assign the DNS servers 192.168.1.1 and 192.168.1.2 to all DHCP clients:

option domain-name-servers 192.168.1.1, 192.168.1.2;

References:

• ISC DHCP 4.4 Manual Pages - dhcp-options
• [RFC 2132 - DHCP Options and BOOTP Vendor Extensions]
• isc-dhcp-server - Community Help Wiki - Official Ubuntu Documentation

 In the ISC DHCPD server configuration, to always assign the IP address 192.168.1.2 to a host with the MAC address 08:00:2b:4c:59:23, you need to create a host declaration within your dhcpd.conf file. Option A provides the correct syntax for this configuration:

This configuration ensures that whenever a DHCP request is received from the MAC address specified, the ISC DHCPD server will always assign it the IP address 192.168.1.2.

References:

• ISC DHCP 4.1 Manual Pages - dhcpd.conf: The official documentation of ISC DHCPD on how to configure the dhcpd.conf file, which includes the host declaration syntax and examples.
• isc-dhcp-server: Using option dhcp-client-identifier in host declaration to identify a client: A question and answer from Server Fault on how to use the option dhcp-client-identifier in a host declaration, which also shows the use of the hardware-ethernet and fixed-address parameters.