For which two protocols can PortFast alleviate potential host startup issues? (Choose two.)

DHCP relies on a client sending a broadcast to discover a DHCP server; if the port is delayed by STP, the client may time out before receiving an IP address. PortFast ensures the port is immediately available for DHCP traffic.

DNS resolution often occurs very early in a host's startup process; if network access is delayed by STP convergence, DNS queries might fail or time out, impacting application functionality. PortFast speeds up network access for DNS.

OSPF (Open Shortest Path First) is a routing protocol used by routers, not typically by end hosts, so PortFast does not directly alleviate OSPF startup issues.

RIP (Routing Information Protocol) is another routing protocol primarily used by routers, and thus PortFast doesn't address host startup issues related to RIP.

CDP (Cisco Discovery Protocol) is a Layer 2 protocol used by Cisco devices to share information, but it's not typically a critical 'startup issue' like obtaining an IP address or resolving names for general network access.