Which two protocols use UDP as a transport protocol by default? (Choose two.)
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A. B. C. D.CD
The two protocols that use User Datagram Protocol (UDP) as a transport protocol by default are DHCP and RIP.
DHCP (Dynamic Host Configuration Protocol) is a protocol that provides a framework for passing configuration information to hosts on a TCP/IP network. When a client device joins a network, it sends a broadcast message to request an IP address and other network configuration information. A DHCP server responds with an IP address and other network configuration parameters. DHCP uses UDP port 67 for the server and UDP port 68 for the client by default.
RIP (Routing Information Protocol) is a protocol used for exchanging routing information between routers in a network. RIP uses UDP as its transport protocol and operates on port number 520. Routers that run RIP send and receive messages using UDP datagrams.
Telnet is a protocol used to provide remote access to devices. It uses Transmission Control Protocol (TCP) as its transport protocol and operates on port number 23.
ICMP (Internet Control Message Protocol) is a protocol used for error reporting and diagnostic messages in IP networks. ICMP is encapsulated within IP packets and does not use a separate transport protocol like UDP or TCP.
Therefore, the correct answers to the question are C. DHCP and D. RIP.