A network administrator is setting up a new phone system and needs to define the location where VoIP phones can download configuration files. Which of the following DHCP services can be used to accomplish this task?
A DHCP scope option can be used to specify the location of configuration files for VoIP phones, by including the address of the file server as an option in the DHCP scope. The DHCP server can then provide this information to the VoIP phones when they request an IP address, so that they know where to download the configuration files from. This allows the administrator to centrally manage the configuration of the phones, rather than having to manually configure each one.
This is A, 100%. An exclusion range has nothing to do with a VOIP phone getting it's configuration files from the TFTP server. I have setup Cisco VOIP phones for years and every time I had to create a DHCP pool for the phones, I always had to include option 150 for Cisco phones to get their phone loads, or option 66 for non-Cisco VOIP.
This is A, 100%. An exclusion range has nothing to do with a VOIP phone getting it's configuration files from the TFTP server. I have setup Cisco VOIP phones for years and every time I had to create a DHCP pool for the phones, I always had to include option 150 for Cisco phones to get their phone loads, or option 66 for non-Cisco VOIP.
To define the location where VoIP phones can download configuration files, the network administrator can use scope options within the Dynamic Host Configuration Protocol (DHCP) service. Scope options are a set of values that can be configured within a DHCP scope, which defines a range of IP addresses that can be leased to clients on a network.
One of the scope options that can be configured is the option for the location of the configuration file server, which specifies the URL or IP address of the server where the configuration files can be downloaded.
leaned toward A. An exclusion range could fall within DHCP scope. Question does not say anything about specific IPs needed. Just asking to define location of config files. To me that sounds like the Scope. https://pbxbook.com/voip/dhcpcfg.html
Tough question...here's my thought process
First of all from the question, the key seems to be "define the location." To me this means a static IP assignment
A- Unlikely to help, limiting the IP range isn't going to help
C- Unlikely to help, changing the time a client has an IP isn't going to help
D- Will help to get an IP address from a DHCP pool on a VLAN, but it won't set anything static. Mike Meyers: "A DHCP relay is nothing more than an agent on the router that acts as a go-between for clients and the server. This feature is useful when working with clients on different subnets, because a client cannot communicate directly with the server until it has the IP configuration information assigned to it."
B- Exclusion range, so you can exclude certain IPs from being distributed, allowing you to set a static IP from within that range.
I got it down between B and D, and think that B is the better answer.
In this context, the question is asking about a feature of DHCP that allows VoIP phones to find their configuration files. This is typically done using DHCP options, which are additional parameters that can be defined for a particular scope in DHCP.
One common use of DHCP options is to specify the address of a TFTP (Trivial File Transfer Protocol) server, which is where VoIP phones often download their configuration files from. So, when the question asks about defining the location where VoIP phones can download configuration files, it’s referring to this use of DHCP options.
Further support of B from Anthony Sequeira
"Another frequent configuration you might make in a DHCP implementation is to configure an exclusion range. This is a portion of the address pool that you never want leased out to clients in the network. Perhaps you have numbered your servers 192.168.1.1–192.168.1.10. Because the servers are statically configured with these addresses, you exclude these addresses from the 192.168.1.0/24 pool of addresses. Your DHCP server then leases out addresses beginning at the first available in the range; in this example, that would be 192.168.1.11."
How is A "limiting the IP range"?
Defining scope allows adding values, and we need another value - location of the config files.
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