Which two statements describe possible causes?

An endpoint cannot connect to a valid TFTP server during the registration process. Which two statements describe possible causes? (Choose two.)
A. The DHCP configuration contains TFTP server 66, but no DNS server is available.
B. The DHCP configuration contains TFTP server 150, but no DNS server is available.
C. No separate voice VLAN configuration on the switch port connected to the endpoint.
D. Cisco Unified Communications Manager CallManager services are not started.
E. Cisco Unified Communications Manager TFTP services are not started.

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6 thoughts on “Which two statements describe possible causes?

  1. I would go with A and E. Thanks Kruzpe13. RFC 5859 the wording there at least is very theoretically convincing.

  2. Cisco IP Phones download their configuration from a TFTP server. When a Cisco IP Phone starts, if it does not have both the IP address and TFTP server IP address preconfigured, it sends a request with option 150 or 66 to the DHCP server to obtain this information.

    DHCP option 150 provides the IP addresses of a list of TFTP servers.
    DHCP option 66 gives the IP address or the hostname of a single TFTP server.

    Doesn’t sound like 66 or 150 cause you can specify the IP address of the server, doesn’t sound like you need DNS.

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